再生混凝土梁柱组合框架抗震性能分析  

Analysis on influence factors of seismic behavior of recycled concrete-filled square steel tubulame

作　　者：倪茜[1] 吴丹丹 李帅 张龙飞 Ni Qian;Wu Dan-dan;Li Shuai;Zhang Long-fei(School of Architecture&Civil Engineering,Xi’an University of Science&Technology,Xi’an 710054,China;Department of Architecture and Civil Engineering,Shaanxi Institute of Mechatronic Technology,Baoji 721001,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]陕西机电职业技术学院建筑工程系,陕西宝鸡721001

出　　处：《工程抗震与加固改造》2020年第3期7-14,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助项目(415002298);陕西省教育厅专项科研计划项目(09JK579)。

摘　　要：为探究再生混凝土梁柱组合框架的抗震性能,利用有限元软件ABAQUS模拟了11个方钢管再生混凝土框架在循环加载作用下的受力,以研究钢管内再生混凝土粗骨料取代率、轴压比及钢管柱屈服强度的变化对框架抗震性能的影响。研究发现随着钢管内再生粗骨料取代率的提高,框架的刚度有所减小,水平承载能力也随之降低,但降低不是特别明显,且模型的延性系数介于3.35~3.43之间,根据抗震延性要求,不同取代率下的方钢管再生混凝土框架运用于实际工程中的承重结构中是可行的;随着方钢管再生混凝土框架轴压比的增大,框架结构骨架曲线下降段表现较为明显,并且延性逐渐降低,但在相同位移条件下框架结构的等效粘滞阻尼系数逐渐增大,耗能能力较好;当钢管屈服强度提高时,钢管对再生混凝土的约束效应增强,使框架的刚度、承载力等均有明显提升,随着方钢管屈服强度的提高,结构的延性变差。To explore the seismic performance of recycled concrete beam column composite frame,Using the finite element software ABAQUS,the forces of 11 recycled concrete filled square steel tubular frames under cyclic loading are simulated,to study the influence of replacement rate of recycled concrete aggregate in square steel tubular,axial pressure ratio and yield strength of square steel tubular on the seismic performance of the frame.It was found that with the increase of the replacement rate of recycled concrete aggregate in the steel tube,The stiffness of the frame decreases,and the horizontal bearing capacity decreases accordingly,but the reduction is not particularly obvious,and the ductility coefficient of the model is between 3.35 and 3.43,According to the seismic ductility requirement,it is feasible to use square steel tube recycled concrete frame with different substitution rates in load-bearing structures of practical projects.As the axial pressure ratio of the recycled concrete aggregate frame with square steel tube increases,the decline section of the skeleton curve of the frame structure is obvious and the ductility is gradually reduced,however,the equivalent viscous damping coefficient of the frame increases with the increase of the axial pressure ratio,the energy dissipation performance of the frame will be better.When the yield strength of the steel tube is increased,the restraint effect of the steel tube on the recycled concrete is enhanced,so that the stiffness and bearing capacity of the frame are significantly increased.with the increase of yield strength of the square steel tube,the ductility of the structure becomes worse.

关 键 词：方钢管再生混凝土 框架结构 取代率 抗震性能 

分 类 号：TU375[建筑科学—结构工程]