T形钢管再生混凝土柱抗震性能的有限元非线性分析

Nonlinear Finite Element Analysis on Seismic Performance of T-shaped Recycled Aggregate Concrete Filled Steel Tube Columns

为研究T形钢管再生混凝土柱在低周反复荷载作用下的抗震性能,在选择合适材料本构关系的基础上,采用有限元软件ABAQUS,模拟得到了3根不同再生骨料取代率下T形钢管再生混凝土柱的荷载-位移曲线,通过滞回曲线分析了不同替代率对试件水平承载力、延性和耗能能力的影响,并将轴压比、含钢率和钢材强度作为变化参数,用建立的有限元模型对T形钢管再生混凝土柱的抗震性能进行非线性分析。研究结果表明,不同取代率对试件的滞回曲线影响不大,所有柱的滞回曲线都非常饱满,说明T形钢管再生混凝土柱具有良好的抗震性能;轴压比对试件骨架曲线影响较大,随着轴压比的增大,试件水平承载力逐渐减小,且下降幅度变大,表现出更差的延性;含钢率对试件初始刚度和抗震性能影响很大,含钢率越大,试件初始刚度也越大,水平承载力和抗震性能也越好;钢材强度对试件的初始刚度影响不大,强度越大,试件的水平承载力越高,抗震性能越好;研究成果可供异性截面钢管再生混凝土结构的推广使用提供参考。

To study the seismic behavior of T-shaped recycled aggregate concrete filled steel tube columns under low reversed cyclic loading,based on appropriate material constitutive relation,analysis of nonlinear element method for T-shaped recycled aggregate concrete filled steel tube columns is carried out under three different recycled aggregate replacement rates by ABAQUS software.The effect of different recycled aggregate replacement rates on horizontal bearing capacity,ductility and energy-dissipating capacity of specimens is analyzed through the hysteretic curve.Based on the finite element model,the axial load ratio,steel ratio and steel strength are taken as basic parameters,the finite element model is used for a nonlinear analysis on the seismic performance of T-shaped recycled aggregate concrete filled steel tube columns.The result shows that different replacement ratio parameters have less influence on the,the hysteretic curves.All hysteretic curves are plump which indicate that T-shaped recycled aggregate concrete filled steel tube columns have a good seismic performance.The axial compression ratio is the main factor affecting the envelope curve of the member.With the increase of the axial compression ratio,the horizontal bearing capacity of specimens decreases and descend range is bigger,which indicates that the ductility of the member becomes worse.The steel ratio has big effect on initial stiffness and antiseismic performance of specimens,The higher the steel rate is,the higher the initial stiffness of specimens is,the better the horizontal bearing capacity and seismic performance would be.The steel strength has less effect on the initial stiffness of specimens.The bigger the steel strength is,the better the horizontal bearing capacity and seismic performance are obtained and better seismic performance is.The research results can provide reference for further extension and application of special-shaped RACFST columns.