بررسي عددي كاربرد كامپوزيت هاي سيماني اليافي توانمند در ديوارهاي برشي بتني

چكيده انگليسي :

Numerical Study of High Performance Fiber Cementitious Composite Application in Concrete Shear Walls Pooya Tehrani Date of Submission 2019 01 19 Pardis College Civil Engineering Group Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Dr Kiachehr Behfarnia kia@cc iut ac irAbstract One of the most resistive elements in the high rise structures against the lateral loads is reinforced concreteshear wall Concrete shear walls play a significant role in controlling structural displacement against lateralforces especially earthquake forces due to the extreme stiffness that they have over other structural elements These concrete walls in addition to have sufficient strength and stiffness should also have adequate ductilityand absorbed energy Concrete is one of the most used materials in the construction industry in the world In recent decades effortshave been made to increase the compressive strength of concrete for the optimal use of materials which hasbeen accompanied by significant improvements However weakness of concrete in tension low ductility andbrittle failures has been considered as the shortcomings of this material To overcome these defects over thepast few decades a number of studies have been carried out on High Performance Fiber ReinforcedCementitious Composites HPFRCC The main components of HPFRCC are generally cement mortar fineaggregates and fiber One of the main characteristic of this material is strain hardening behavior under tensileloading The experiment s results show that bearing capacity ductility energy absorption durability andresistance to external aggressive agents the formation of multiple micro crack increase with HPFRCC materialas compared with traditional concrete The short spread length fiber control crack opening and propagationcracks and in most cases steel fibers glass polypropylene polyethylene polyolefin polyvinyl alcohol andcarbon fiber are used There are many old or constructed concrete structures with insufficient strength and low ductility against Thegravity and seismic loads Therefore in this research the behavior of concrete shear walls and a few proposedstrengthening patterns of concrete shear wall has been investigated using HPFRCC or ECC EngineeringCementitious Composites In this regard concrete shear walls have been numerically modeled and studiedusing nonlinear finite element method and ABAQUS software Damaged plasticity behavioral model with thestrain hardening in tension of concrete behavior was used in this study In this research the effect of usingHPFRCC in concrete wall with different percentages of vertical and horizontal reinforcement shear stirrups inboundary zone and influence of tensile properties have been investigated in comparison with traditionalconcrete material The results indicated the increasing of load bearing capacity 4 times ductility 2 times and energy absorption in the case of replacement of high performance fiber reinforced cementitious materialsinstead of traditional concrete Also the use of ECC materials in comparison with HPFRCC has shown farmore favorable effects on the behavior of concrete shear walls Keywords Concrete shear wall High Performance Fiber Reinforced Cementitious Composite HPFRCC Engineering Cementitious Composites ECC Nonlinear finite element method ABAQUS

طهراني، پويا

بررسي عددي كاربرد كامپوزيت هاي سيماني اليافي توانمند در ديوارهاي برشي بتني

ديوار برشي بتن آرمه , كامپوزيت هاي سيماني اليافي توانمند , كامپوزيت هاي سيماني مهندسي شده , روش اجزاي محدود غيرخطي , ABAQUS