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Effect of fiber angle on LYP steel shear walls behavior

Journal of Central South University 2014年第2期21卷 768-774页

作者： farzad hatami Ali Ghamari Farshad hatami Structure and Earthquake Center Amirkabir University of Technology Researcher of Civil Engineering Azad UniversityDareshahr Branch Civil Engineering Department Amirkabir University of Technology

Steel shear wall(SSW) was properly determined using numerical and experimental *** properties of SSW and LYP(low yield point) steel shear wall(LSSW) were *** is revealed that LSSW exhibits higher properties compared to SSW in both elastic and inelastic *** is also concluded that the addition of CFRP(carbon fiber reinforced polymers) enhances the seismic parameters of LSSW(stiffness,energy absorption,shear capacity,over strength values).Also,stress values applied to boundary frames are lower due to post buckling *** effect of fiber angle was also studied and presented as a mathematical equation.

关键词： carbon fiber reinforced polymers fiber angle low yield point steel shear wall post buckling composite

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Progressive collapse resisting capacity of reinforced concrete load bearing wall structures

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Journal of Central South University 2015年第7期22卷 2730-2738页

作者： Alireza Rahai Alireza Shahin farzad hatami Department of Civil Engineering Amirkabir University of Technology (Tehran Polytechnic) No.424 Structural & Earthquake Research Center (SERC) Amirkabir University of Technology No.424

Reinforced concrete(RC) load bearing wall is widely used in high-rise and mid-rise buildings. Due to the number of walls in plan and reduction in lateral force portion, this system is not only stronger against earthquakes, but also more economical. The effect of progressive collapse caused by removal of load bearing elements, in various positions in plan and stories of the RC load bearing wall system was evaluated by nonlinear dynamic and static analyses. For this purpose, three-dimensional model of 10-story structure was selected. The analysis results indicated stability, strength and stiffness of the RC load-bearing wall system against progressive collapse. It was observed that the most critical condition for removal of load bearing walls was the instantaneous removal of the surrounding walls located at the corners of the building where the sections of the load bearing elements were changed. In this case, the maximum vertical displacement was limited to 6.3 mm and the structure failed after applying the load of 10 times the axial load bored by removed elements. Comparison between the results of the nonlinear dynamic and static analyses demonstrated that the "load factor" parameter was a reasonable criterion to evaluate the progressive collapse potential of the structure.

关键词： reinforced concrete(RC) load bearing wall structure progressive collapse fiber sections nonlinear analysis load factor method

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Evaluating Simultaneous Impact of Slag and Tire Rubber Powder on Mechanical Characteristics and Durability of Concrete

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Journal of Renewable Materials 2022年第8期10卷 2155-2177页

作者： Mostafa Amiri farzad hatami Emadaldin Mohammadi Golafshani Department of Civil Engineering Science and Research BranchIslamic Azad UniversityTehranIran Structural and Earthquake Research Center(SERC) Amirkabir University of Technology(Tehran Polytechnic)TehranIran Department of Civil Engineering Monash UniversityMelbourneAustralia

In this experimental study,the impact of Portland cement replacement by ground granulated blast furnace slag(GGBFS)and micronized rubber powder(MRP)on the compressive,flexural,tensile strengths,and rapid chloride migration test(RCMT)of concrete were *** this study,samples with different binder content and water to binder ratios,including the MRP with the substitution levels of 0%,2.5%and 5%,and the GGBFS with the substitution ratios of 0%,20%and 40%by weight of Portland cement were *** to the results,in the samples containing slag and rubber powder in the early ages,on average,a 12.2%decrease in the mechanical characteristics of concrete was observed,nonetheless with raising the age of the samples,the impact of slag on reducing the porosity of concrete lowered the negative impact of rubber *** durability characteristics,the RCMT results of the samples were enhanced by using rubber powder because of its insulation ***,adding slag into the MRP-included mixtures results in a 23%reduction in the migration rate of the chloride ion *** last,four mathematical statements were derived for the mechanical and durability of concrete containing the MRP and GGBFS utilizing the genetic programming method.

关键词： Micronized rubber powder ground granulated blast furnace slag waste materials mechanical properties durability

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