Nonlinear Analysis Of Reinforced Concrete Core Walls

With the development of high-rise building,the core tube structure system will be used more and more as the high-rise and super high-rise buildings important component of the lateral load resistance.The theoretical analysis method and study of mechanical properties of the core wall is important.As the actual core tube generally achieve more than 100 meters,test conditions become a bottleneck of the study,and with the use of more precise calculations of finite element analysis software,simulating this is an important research tools,and the finite element selection,the use of numerical methods have a direct impact on the reliability of the final results.In this paper,two non-linear analysis software:ABAQUS and CANNY,were used to analyze that the simulation core wall at different axial load ratio,different coupled -beam stiffness,the steel ratio,height-width ratio as well as the load angle with two models,the shell element and fiber model.Compared with the test,on the one hand, study the effectiveness of the analysis of the core wall with two models;On the other hand,through the software analysis,the mechanical properties of the core wall was received.Through the shell element of the modeling analysis of the core wall,the elements is not conformed with the actual performance of the material,usually caused by overestimated the stiffness of components,and shell element stiffness.of the out-of plane can not be taken into account.In the case of high axial load ratio,as well as the structure of a high degree of increase in P-â–³effects of the more obvious cases,the results obtained with the experimental value of the difference between large,and shell-element long time,unable to meet the needs anymore.The use of a fiber model,is about a wall as a element.Fiber model is a discredited-section model as well and is used to represent the interaction among biaxial bending and axial tension/compression.Realistic material stress-strain models can be used to characterize uniaxial spring(or fiber).At critical section of a line element,the fiber slice represents moment-curvature relations.Therefore, the distribution of the nonlinearity has to be assumed.However,this method of calculation can not be certain components in the deformation and mechanical properties under severe damage to the accuracy,elasticity and elastoplasticity therefore can only be calculated.The entire calculation and simulation software is mostly consistent with the test results, which able to explain parameter values of the core wall in the appropriate circumstances; different axial load ratio,coupled-beam stiffness,the steel ratio,height-width ratio as well as the load angle influence the strength and ductility of reinforced concrete core wall.This also explains the non-linear finite element method simulation of this theory the core wall in the future of complex structures such as high-rise feasibility analysis.