Seismic Response Analysis Of RC Frame Based On Fiber Beam Grid Simulation Of Reinforced Concrete Slabs

This paper adopted ABAQUS finite element analysis software to analyze the static and dynamic elastoplasticity of a three-story RC frame structure model in Civil Engineering Experimental Center of Lanzhou University of Technology,and stimulated its slab with solid model,layered-shell model and fiber beam mesh model with different mesh sizes,respectively and mainly carried out the following tasks:(1)Introduced the theoretical principles of different slab finite element models from perspectives of element type,material constitutive model and modeling method,successively established 5 models according to experimental drawing,stimulated the slab with solid element,layered-shell element and fiber beam element with different sizes,respectively and constructed pure frame model of relevant structure.(2)Analyzed the dynamic properties of 6 established numerical models,compared the influences of different slab models on structural mode and period to verify the applicability of fiber beam mesh model to slab stimulation.(3)Analyzed models generated by different modeling methods with horizontally inverted triangle-loaded Pushover,verified the applicability of fiber beam mesh model to slab modeling by comparing shear stress-displacement curve,model nature around performance point,inter-story drift angle,stress and damage of slab,and comparably discussed the influence of fiber beam mesh model with different mesh sizes on the slab stimulation precision.(4)3 seismic waves selected with two-frequency wave-selecting method were applied to slab models with different modeling methods to perform dynamic time-history analysis and further discussed the similarities and differences between different models and the applicability of fiber beam model to slab stimulation in terms of variation rules of seismic performance indexes such as top story peak acceleration value and maximum inter-story drift angle.