MyMedR

Displaying publications 1 - 20 of 317 in total

Abstract:

Sort:

Fulltext Structure and Properties of Poly(Ethylene-co-vinyl Acetate) Nanocomposites with Dual-Functionalized Dolomite Nanoparticles

Ahmad Fauzi AA, Osman AF, Alosime EM, Abdul Halim KA, Abdullah MAA

Int J Mol Sci, 2024 Nov 21;25(23).
PMID: 39684232 DOI: 10.3390/ijms252312519

Poly(ethylene-co-vinyl acetate) (PEVAc) is a copolymer that consists of non-polar polyethylene (PE) and a polar polyvinyl acetate (PVAc) monomer. PEVAc has high elasticity and is resilient, making it suitable for a variety of applications. However, the tensile strength of this copolymer needs to be improved for specific applications that require enough strength to tolerate high external tension or stress. This study proposed the use of dual-functionalized dolomite nanoparticles (DF-DNPs) composed of polar and non-polar nano-dolomite (P-DNPs and NP-DNPs) as nanofillers to reinforce the PEVAc. PEVAc/DF-DNP film appears to have a more homogeneous mixture, which is better for forming an optimal nanocomposite material. It also exhibits the highest tensile strength (10.48 MPa), elongation at break (1175.73%), and tensile toughness (62.12 MPa), which are higher by increments of 46.8%, 9.4%, and 20.3%, respectively, as compared to the neat PEVAc. The result proved that using DF-DNPs as a nanofiller can improve the strength of PEVAc while maintaining its flexibility to avoid brittleness of the nanocomposite film. Furthermore, its thermal characteristics were also successfully enhanced. A biostability assessment showed that the use of DF-DNPs as nanofiller caused the PEVAc copolymer to achieve the best water resistance, as it only exhibited a 2.63% weight increase, the lowest reduction in tensile properties among the studied fillers, and the best retention in surface degradation upon 3-month exposure to the in vitro environment. These findings indicate that the DF-DNPs help in developing a homogeneous nanocomposite by interacting with PE and PVAc.

Matched MeSH terms: Tensile Strength*
Fulltext Performance of high strength concrete specimens with square section using steel strapping tensioning technique

Hoong-Pin Lee, Abdullah Zawawi Awang, Wahid Omar

Pertanika Journal of Science & Technology, 2017;25(105):235-244.
MyJurnal

High strength concrete (HSC) has lower ductility, but higher in strength compared to normal strength concretes. The strength and ductility of HSC can be improved by applying external confinement, such as steel strapping tensioning technique (SSTT). However, SSTT was literately reported effective in confining circular specimens, but the effectiveness of SSTT on square cross section specimens are yet well investigated. This study focuses on HSC square cross section specimens with different corner ratio, which were right angle and rounded corner. In addition, the effect of different number of layer of steel straps confining around the specimens under optimum lateral pre-tensioning stress also been investigated. The number of layers was fixed to two layers and four layers. Fifteen HSC specimens with dimension of 88 mm x 88 mm x 200 mm, which consist of three unconfined specimens, six right angle specimens, and six rounded corner specimens were prepared and tested monotonically to failure. The experimental results show that the strength and ductility of HSC improved significantly by using rounded corner confined specimens and higher number of layer of confinements. This is due to more uniform confining pressure was exerted on entire surface of rounded corner confined specimens. The strength and ductility of the specimens can be improved up to 53.7% and 207.5% respectively.

Matched MeSH terms: Tensile Strength
Fulltext Modelling of precast concrete composite slab using finite and interface elements

Jaafar, M.S., Wong, N.J., Noorzaei, J., Thanoon, W.A.

Pertanika Journal of Science & Technology, 2009;17(2):-.
MyJurnal

This study presents an efficient finite element analysis technique which shows great versatility in
modelling of precast composite flooring system subjected to static loadings. The method incorporates sliding and opening in the analysis of composite structures using the interface element which was specifically designed to simulate the actual behaviour at the interfaces between contacting materials. A three-dimensional finite element model of the precast composite slab which exhibits discontinuous behaviour was performed to demonstrate the potential and applicability of the proposed method of analysis. The results of the analysis demonstrate that the overall response of a discontinuous system to external loading is significantly affected by the bonding condition at the interfaces between the contacting materials.

Matched MeSH terms: Tensile Strength
The effect of spent coffee ground (SCG) loading, matrix ratio and biological treatment of SCG on poly(hydroxybutyrate) (PHB)/poly(lactic acid) (PLA) polymer blend

Boey JY, Kong U, Lee CK, Lim GK, Oo CW, Tan CK, et al.

Int J Biol Macromol, 2024 May;266(Pt 2):131079.
PMID: 38537860 DOI: 10.1016/j.ijbiomac.2024.131079

This study investigates the effects of SCG embedded into biodegradable polymer blends and aimed to formulate and characterise biomass-reinforced biocomposites using spent coffee ground (SCG) as reinforcement in PHB/PLA polymer blend. The effect of SCG filler loading and varying PHB/PLA ratios on the tensile properties and morphological characteristics of the biocomposites were examined. The results indicated that tensile properties reduction could be due to its incompatibility with the PHB/PLA matrixSCG aggregation at 40 wt% content resulted in higher void formation compared to lower content at 10 wt%. A PHB/PLA ratio of 50/50 with SCG loading 20 wt% was chosen for biocomposites with treated SCG. Biological treatment of SCG using Phanerochaete chrysosporium CK01 and Aspergillus niger DWA8 indicated P. chrysosporium CK01 necessitated a higher moisture content for optimum growth and enzyme production, whereas the optimal conditions for enzyme production (50-55 %, w/w) differed from those promoting A. niger DWA8 growth (40 %, w/w). SEM micrographs highlighted uniform distribution and effective wetting of treated SCG, resulting in improvements of tensile strength and modulus of biocomposites, respectively. The study demonstrated the effectiveness of sustainable fungal treatment in enhancing the interfacial adhesion between treated SCG and the PHB/PLA matrix.

Matched MeSH terms: Tensile Strength
Fulltext Physicochemical Characteristics of Pangasius sp. Skin-Gelatin-Based-Edible Film Enriched with Silver Nanoparticles

Nurdiani R, Prihanto AA, Firdaus M, Aini FN, Nabilah FA, Talib RA, et al.

F1000Res, 2023;12:160.
PMID: 42922468 DOI: 10.12688/f1000research.129024.3

BACKGROUND: Edible films for food packaging can be produced from hydrocolloids, lipids, resins, and composites, including gelatin. Gelatin has good film-forming ability and has been proposed as an alternative to non-biodegradable plastics. The incorporation of naturally active compounds into edible films may protect food products from oxidation and microbial contamination while also affecting the physicochemical properties of the film. Silver nanoparticles (AgNPs) have been used as active agents in food packaging because of their antibacterial and antifungal properties. Therefore, this study aimed to determine the effect of AgNP incorporation on the physicochemical characteristics of edible films prepared from Pangasius sp. skin gelatin.
METHODS: Bruguiera gymnorrhiza mangrove extract was used for the green synthesis of AgNPs. AgNPs at different concentrations (0, 2, 4, and 8%) were incorporated into gelatin-based edible films. The films were evaluated for thickness, tensile strength, elongation at break, water vapour transmission rate, moisture content, pH, and colour.
RESULTS: AgNP incorporation significantly affected the colour of the gelatin-based edible films, with increasing AgNP concentration resulting in darker films. However, despite some numerical variations, AgNP incorporation did not significantly affect film thickness (145-216 μm), tensile strength (14.58-19.72 MPa), elongation at break (21.86-54.19%), water vapour transmission rate (30.91-42.55 g/m 2/day), moisture content (9.57-11.16%), or pH (5.92-6.01).
CONCLUSIONS: AgNP incorporation did not significantly affect the physicochemical properties of the gelatin-based edible films, except for colour. These findings provide baseline information for further development of AgNP-enriched gelatin-based edible films for food packaging applications.

Matched MeSH terms: Tensile Strength
Characteristics of naturally woven Waru bark fiber for eco-friendly composite reinforcement

Wirawan WA, Wulansari A, Sabitah A, Putra MRF, Gapsari F, Sartika D, et al.

Int J Biol Macromol, 2025 Mar;295:139459.
PMID: 39756744 DOI: 10.1016/j.ijbiomac.2025.139459

The aim of this study was to investigate the potential of Waru bark fiber (WBF) as a reinforcement material for composites. To achieve this aim, WBF was extracted using a conventional process, to ensure its purity, and then characterized for physical, mechanical, chemical, and thermal properties. Microstructure analysis was performed using Scanning Electron Microscope (SEM) to show uniform and exceptional fiber sheets with naturally woven fiber shapes. A high value of 152.77 MPa was found for fiber's tensile strength in the mechanical test. Following this discussion, the fiber's crystallinity index (CI) was 56.54 %, and the X-Ray Fluorescence (XRF) test showed a composition ratio of O = 48.63 % and C = 36.74 %. Thermal analysis using Differential Thermal Analysis-Thermogravimetric Analysis (DTA-TGA) showed that the cellulose fiber could withstand temperatures stability up to 312 °C. Finally, this study offered a sustainable solution to reduce the reliance on synthetic fiber in various industries by suggesting the use of reliable WBF as reinforcement.

Matched MeSH terms: Tensile Strength*
Recent advances in thermal properties of hybrid cellulosic fiber reinforced polymer composites

Krishnasamy S, Thiagamani SMK, Muthu Kumar C, Nagarajan R, R M S, Siengchin S, et al.

Int J Biol Macromol, 2019 Dec 01;141:1-13.
PMID: 31472211 DOI: 10.1016/j.ijbiomac.2019.08.231

Bio-composites are easy to manufacture and environmentally friendly, could reduce the overall cost and provide lightweight due to the low density of the natural fibers. In a bid to compete with the synthetic fiber reinforced composites, a single natural fiber composite may not be a good choice to obtain optimal properties. Hence, hybrid composites are produced by adding two or more natural fibers together to obtain improved properties, such as mechanical, physical, thermal, water absorption, acoustic and dynamic, among others. Regarding thermal stability, the composites showed a significant change by varying the individual fiber compositions, fiber surface treatments, addition of fillers and coupling agents. The glass transition temperature and melting point obtained from the thermomechanical analysis and differential scanning calorimetry are not the same values for several hybrid composites, since the volume variation was not always parallel with the enthalpy change. However, the difference between the temperature calculated from the thermomechanical analysis and differential scanning calorimetry was lower. Significantly, this critical reviewed study has a potential of guiding all composite designers, manufacturers and users on right selection of composite materials for thermal applications, such as engine components (covers), heat shields and brake ducts, among others.

Matched MeSH terms: Tensile Strength*
Fulltext Mechanical and Morphological Properties of Bio-Phenolic/Epoxy Polymer Blends

Ismail AS, Jawaid M, Hamid NH, Yahaya R, Hassan A

Molecules, 2021 Feb 03;26(4).
PMID: 33546097 DOI: 10.3390/molecules26040773

Polymer blends is a well-established and suitable method to produced new polymeric materials as compared to synthesis of a new polymer. The combination of two different types of polymers will produce a new and unique material, which has the attribute of both polymers. The aim of this work is to analyze mechanical and morphological properties of bio-phenolic/epoxy polymer blends to find the best formulation for future study. Bio-phenolic/epoxy polymer blends were fabricated using the hand lay-up method at different loading of bio-phenolic (5 wt%, 10 wt%, 15 wt%, 20 wt%, and 25 wt%) in the epoxy matrix whereas neat bio-phenolic and epoxy samples were also fabricated for comparison. Results indicated that mechanical properties were improved for bio-phenolic/epoxy polymer blends compared to neat epoxy and phenolic. In addition, there is no sign of phase separation in polymer blends. The highest tensile, flexural, and impact strength was shown by P-20(biophenolic-20 wt% and Epoxy-80 wt%) whereas P-25 (biophenolic-25 wt% and Epoxy-75 wt%) has the highest tensile and flexural modulus. Based on the finding, it is concluded that P-20 shows better overall mechanical properties among the polymer blends. Based on this finding, the bio-phenolic/epoxy blend with 20 wt% will be used for further study on flax-reinforced bio-phenolic/epoxy polymer blends.

Matched MeSH terms: Tensile Strength*
Fulltext Strength development of high-strength ductile concrete incorporating Metakaolin and PVA fibers

Nuruddin MF, Khan SU, Shafiq N, Ayub T

ScientificWorldJournal, 2014;2014:387259.
PMID: 24707202 DOI: 10.1155/2014/387259

The mechanical properties of high-strength ductile concrete (HSDC) have been investigated using Metakaolin (MK) as the cement replacing material and PVA fibers. Total twenty-seven (27) mixes of concrete have been examined with varying content of MK and PVA fibers. It has been found that the coarser type PVA fibers provide strengths competitive to control or higher than control. Concrete with coarser type PVA fibers has also refined microstructure, but the microstructure has been undergone with the increase in aspect ratio of fibers. The microstructure of concrete with MK has also more refined and packing of material is much better with MK. PVA fibers not only give higher stiffness but also showed the deflection hardening response. Toughness Index of HSDC reflects the improvement in flexural toughness over the plain concrete and the maximum toughness indices have been observed with 10% MK and 2% volume fraction of PVA fibers.

Matched MeSH terms: Tensile Strength*
Fulltext Functionality of wet-granulated disintegrant in comparison to directly incorporated disintegrant in a poorly water-soluble tablet matrix

Veronica N, Lee ESM, Heng PWS, Liew CV

Int J Pharm, 2024 Aug 15;661:124467.
PMID: 39004293 DOI: 10.1016/j.ijpharm.2024.124467

Tablet disintegration is crucial for drug release and subsequent systemic absorption. Although factors affecting the disintegrant's functionality have been extensively studied, the impact of wet granulation on the performance of disintegrants in a poorly water-soluble matrix has received much less attention. In this study, the disintegrants, crospovidone (XPVP), croscarmellose sodium (CCS) and sodium starch glycolate (SSG), were wet-granulated with dibasic calcium phosphate dihydrate as the poorly water-soluble matrix and polyvinylpyrrolidone as the binder. The effect of wet granulation was studied by evaluating tablet tensile strength and disintegratability. Comparison between tablets with granulated or ungranulated disintegrants as well those without disintegrants were also made. Different formulations showed different degrees of sensitivity to changes in tablet tensile strength and disintegratability post-wet granulation. Tablet tensile strength decreased for tablets with granulated disintegrant XPVP or CCS, but to a smaller extent for SSG. While tablets with granulated XPVP or CCS had increased disintegration time, the increment was lesser than for SSG, suggesting that wet granulation impacted a swelling disintegrant more. The findings showed that tablets with wet-granulated disintegrant had altered the disintegrant's functionality. These findings could provide better insights into changes in the disintegrant's functionality after wet granulation.

Matched MeSH terms: Tensile Strength*
Fulltext Hole size effects on the open hole tensile properties of Woven Kevlar-Glass Fibre hybrid composite laminates

Norazean Shaari, Aidah Jumahat

Pertanika Journal of Science & Technology, 2017;25(107):309-318.
MyJurnal

The effects of hole size on open hole tensile properties of Kevlar-glass fibre hybrid composite laminates were thoroughly investigated in this work. Woven Kevlar/glass fibre epoxy composite laminates were fabricated using hand lay-up and vacuum bagging technique. Specimens of five different hole size (1 mm, 4 mm, 6 mm, 8 mm and 12 mm) were carefully prepared before the tensile test was performed according to ASTM D5766. Results indicated that hybridizing Kevlar to glass fibres improved tensile strength and failure strain of hybrid composite specimen. In addition, increasing the hole size reduced strength retention of the hybrid specimen from 96% for 1 mm hole size to 62% and 44% for 6 mm and 12 mm, respectively. Fractography analysis showed that several types of failure mechanisms were observed such as brittle failure, ductile failure, fibre breakage, delamination and fibre-matrix splitting. It is concluded that as hole size increased, failure behaviour changed from a matrix dominated failure mode to a fibre-dominated failure mode.

Matched MeSH terms: Tensile Strength
Fulltext Investigating the effect of different Weft densities and draw in plan on physical properties and Seam strength of Woven plain fabrics

Nurul Syazwani Abdul Latif, Suzaini Abdul Ghani

Pertanika Journal of Science & Technology, 2017;25(108):19-28.
MyJurnal

Weft density and draw in plan play an important role since they affect physical properties such as fabric weight, cloth cover factor as well as seam strength. Weft density refers to the amount of weft yarn in one inch. Meanwhile, draw in plan refers to the amount of heald shaft used and the order of warp yarn through the heald. In this study, plain woven fabrics were produced by using Sulzer Rapier Loom Machine. There were two different types of weft density used which were 15 and 20 weft per centimeter (wpcm) and four draws in plan: pointed, straight, broken and broken mirror. Seams were constructed by using plain seam of Ssa-1, four stitches of stitch density and 301 lockstitches for stitch type. Subsequently, the fabric samples were tested on seam strength by using Testometric tester. As a result of this study, it is proven that weft density and draw in plan of woven plain fabric are parameters that affect the seam strength and seam efficiency. The highest increase in percentage of seam strength was obtained from straight draw in plan which increases up to 17.19% from 15wpcm to 20wpcm. Meanwhile, broken draw in plan has the lowest increase percentage for seam strength which is 6.46%. Furthermore, seam efficiency also shows straight draw in plan gives good fabric durability compared to others. Lastly, it also shows broken draw in plan has no significant effect on fabric tensile strength and seam strength.

Matched MeSH terms: Tensile Strength
Fulltext Influence of Kenaf fibre orientation effect on the mechanical properties of hybrid structure of Fibre Metal Laminate

Ng, L.F., Sivakumar, D., Zakaria, K.A., Sivaraos, Bapokutty, O.

Pertanika Journal of Science & Technology, 2017;25(105):1-8.
MyJurnal

Efforts to reduce manufacturing cost and negative environmental impacts have seen the mixture of natural fibre with synthetic fibre in composite structures. However, there are limited studies on the notch effect and fibre orientation on mechanical properties of hybrid fibre metal laminate (FML). In this study, tensile properties of FML with notch and different fibre orientation were investigated. The hybrid FML incorporated with kenaf fibre at the middle layer was compared with FML with three layers of E-glass fibre. Kenaf fibre and E-glass fibre used were in plain woven form. The FML in 2/1 configuration was manufactured through hot press manufacturing method to bond layers of annealed aluminium 5052 to the composite. Tensile test was conducted in a quasi-static manner according to ASTM E8. The results showed FML with three layers of glass fibre exhibited higher tensile strength compared with hybrid FML. However, the introduction of kenaf fibre in hybrid FML reduces the notch and fibre orientation sensitivity compared with glass fibre reinforced FML.

Matched MeSH terms: Tensile Strength
Fulltext Investigation on moisture susceptibility and rutting resistance of Asphalt mixtures incorporating Nanosilica modified binder

Ahmad Kamil Arshad, Khairil Azman Masri, Juraidah Ahmad, Mohamad Saifullah Samsudin

Pertanika Journal of Science & Technology, 2017;25(103):19-30.
MyJurnal

This paper presents the outcome of a laboratory investigation on mix design, resilient modulus, moisture susceptibility and rutting resistance of Stone Mastic Asphalt (SMA) and Dense Graded Asphalt (AC) that is incorporated with Nanosilica (NS) modified binder. Penetration Grade 60-70 (PEN60-70) types of binder were mixed with nanoparticles (NS) using concentration of 0wt%, 2wt%, 4wt% and 6wt% by weight of asphalt binder. The mixtures were tested for resilient modulus, indirect tensile strength and rutting, in order to evaluate the performance of NS-SMA and NS-AC. The results show that the existence of NS is capable of enhancing the performance of both asphalt mixtures, and the addition of NS decreases the susceptibility of moisture damage and provides better resistance against permanent deformation. Furthermore, the addition of 4wt% NS appears to be the most effective amount for the performance enhancement in AC and SMA mixtures.

Matched MeSH terms: Tensile Strength
Fulltext Effect of Batu Pahat Soft Clay (BPSC) concentrations on the physical and rheological properties of Asphalt binder

Mohd Idrus Mohd Masirin, Ahmed Suliman Bader Ali, Allam Musbah Al Allam

Pertanika Journal of Science & Technology, 2017;25(105):101-108.
MyJurnal

The major aim of this research was to investigate the addition of BPSC on the physical and rheological properties of asphalt binder. In this study, addition of five different percentages of BPSC compositions were studied, namely (2, 4, 6 and 8%). The impact of modifier on the rheological and physical properties was determined using conventional tests, such as softening point, ductility and penetration, and measurements from a dynamic shear rheometer. Based on the results, it was observed that the addition of BPSC has a significant impact on the rheological properties of asphalt binder and would improve rutting resistance at high temperatures. Meanwhile, results related to physical properties indicated that a decrease in penetration and increase in softening points results in stiffness of BPSC. The results showed that BPSC reduced temperature susceptibility and increased stiffness and elastic behaviour in comparison to unmodified asphalt binder. This means BPSC would increase the resistance of permanent deformation (rutting). Finally, BPSC could be considered as an appropriate additive to modify the properties of asphalt binder.

Matched MeSH terms: Tensile Strength
Fulltext Bending strength of steel fibre reinforced concrete ribbed slab panel

Amir Syafiq Samsudin, Mohd Hisbany Mohd Hashim, Siti Hawa Hamzah, Afidah Abu Bakar

Scientific Research Journal, 2018;15(1):15-29.
MyJurnal

Nowadays, demands in the application of fibre in concrete increase gradually as an engineering material. Rapid cost increment of material causes the increase in demand of new technology that provides safe, efficient and economical design for the present and future application. The introduction ofribbed slab reduces concrete materials and thusthe cost, but the strength of the structure also reduces due to the reducing of material. Steel fibre reinforced concrete (SFRC) has the ability to maintain a part of its tensile strength prior to crack in order to resist more loading compared to conventional concrete. Meanwhile, the ribbed slab can help in material reduction. This research investigated on the bending strength of 2-ribbed and 3-ribbed concrete slab with steel fibre reinforcement under static loading with a span of 1500 mm and 1000 mm x 75 mm in cross section. An amount of 40 kg/m steel fibre of all total concrete volume was used as reinforcement instead of conventional bars with concrete grade 30 N/mm2 . The slab wastested underthree-point bending. Load versus deflection curve was plotted to illustrate the result and to compare the deflection between control and ribbed slab. Thisresearch showsthat SFRCRibbed Slab capable to withstand the same amount of load as normal slab structure, although the concrete volume reduces up to 20%.

Matched MeSH terms: Tensile Strength
Effect of electron beam irradiation on natural rubber/linear low density polyethylene blends with m-phenylenebismaleimide

Nor Hayati Muhammad, Ibrahim Abdullah, Dahlan Mohd

Sains Malaysiana, 2011;40:1179-1186.

The effects of HVA-2 on radiation-induced cross-linkings in 60/40 natural rubber/ linear low density polyethylene (NR/LLDPE) blends was studied. NR/LLDPE was irradiated by using a 3.0 MeV electron beam machine with doses ranging from 0 to 250 kGy. Results showed that under the irradiation employed, the blends NR/LLDPE were cross-linked by the electron beam irradiation. The presence of HVA-2 in the blends caused the optimum dose to decrease and the blends to exhibit higher tensile properties. Further, within the dose range studied, the degradation caused by electron beam irradiation was found to be minimal. The optimized processing conditions were 120oC, 50 rpm rotor speed and 13 min processing time. The gel content, tensile strength, elongation at break, hardness and impact test studies were used to follow the irradiation-induced cross-linkings in the blend. For blends of 60/40 NR/LLDPE with 2.0 phr HVA-2, the optimum tensile strength and dose, were 19 MPa and 100 kGy, respectively. Blends of 60/40 NR/LLDPE without HVA-2, the optimum tensile strength and dose were 17.2 MPa and 200 kGy, respectively.

Matched MeSH terms: Tensile Strength
Investigation of linearity between mechanical properties of wood using graphical method

Mohd Jamil Abdul Wahab, Mohd Zamin Jumaat

Sains Malaysiana, 2014;43:211-218.

Some basic requirements are set for small clear specimen data to incorporate Malaysian timbers into equivalent European timber strength classes. In general, the correlation between structural and small clear specimen test results must be established for every timber group regardless of origin. This paper introduces a sort-plot technique for analysing the correlation of some mechanical properties of timber in selecting appropriate parametric model. Bending test was conducted on mixed species hardwoods for the determination of strength and stiffness values of both structural and small size specimens. The results showed that the sort-plot diagrams demonstrate an obvious linearity pattern between timber properties despite having poor regression values. The technique verified that properties of timber in structural and small size specimens correlated linearly.

Matched MeSH terms: Tensile Strength
Fulltext Deficient reinforced concretebeam-column joint strengthening

Mohammed, Kachalla, Kareem, Shatha Sahib

The Pertanika Journal of Scholarly Research Reviews, 2018;4(3):11-25.
MyJurnal

Structural buildings in seismic prone area, the required energy dissipation of strong column-weak beam especially for reinforced concrete frame structures is achievably through adequate beam-column joint strengthening connection in order to have high seismic performance. Literature investigation shows several approaches and techniques for modelling the weak joint for a typical frame structure. This paper extensively reviews those techniques, methods, concepts and their performance in improving the shear capacity for a deficient reinforced concrete beam-column joints in withstanding seismic loads. The beam-column joints performance responses showed positive. However, the need for an improved connection that will offer high ductility capacity and energy dissipation ability for post-tensioned reinforced concrete beam-column joints with continuing bottom reinforcement is highly feasible with the use of the Direct Displacement Based design philosophy. This will be of great interest for the future development of highly efficient joint system for frame structure capable of resisting significant seismic load.

Matched MeSH terms: Tensile Strength
Fulltext Glass Fiber Reinforced Polymer (GFRP) Bars for Enhancing the Flexural Performance of RC Beams Using Side-NSM Technique

Hosen MA, Alengaram UJ, Jumaat MZ, Sulong NHR, Darain KMU

Polymers (Basel), 2017 May 19;9(5).
PMID: 30970858 DOI: 10.3390/polym9050180

Reinforced concrete (RC) structures require strengthening for numerous factors, such as increased load, modification of the structural systems, structural upgrade or errors in the design and construction stages. The side near-surface mounted (SNSM) strengthening technique with glass fiber-reinforced polymer (GFRP) bars is a relatively new emerging technique for enhancing the flexural capacities of existing RC elements. Nine RC rectangular beams were flexurally strengthened with this technique and tested under four-point bending loads until failure. The main goal of this study is to optimize the structural capacity of the RC beams by varying the amount of strengthening reinforcement and bond length. The experimental test results showed that strengthening with SNSM GFRP bars significantly enhanced the flexural responses of the specimens compared with the control specimen. The first cracking and ultimate loads, energy absorption capacities, ductility and stiffness were remarkably enhanced by the SNSM technique. It was also confirmed that the bond length of the strengthened reinforcement greatly influences the energy absorption capacities, ductility and stiffness. The effect of the bond length on these properties is more significant compared to the amount of strengthening reinforcement.

Matched MeSH terms: Tensile Strength

Filters

Please provide feedback to Administrator (afdal@afpm.org.my)

External Links