全尺寸预制装配式剪力墙竖向连接节点受力性能数值分析

Numerical analysis on the mechanical behavior of the vertical connection joints of full scale prefabricated shear wall

为研究预制装配式剪力墙结构竖向连接节点的受力性能,以某预制装配式剪力墙实际工程中的全尺寸墙体为研究对象,采用通用有限元软件ABAQUS,分别建立了现浇与预制钢筋混凝土剪力墙精细化有限元模型,对比分析了不同轴压比下现浇剪力墙试件与预制装配式剪力墙试件的受力性能差异;对于预制装配式试件,通过在接缝处预制与现浇混凝土表面设置摩擦接触来实现其整体性建模,并研究了不同摩擦系数对预制装配式试件承载力的影响。研究结果表明:预制装配式试件的承载力、变形性能与破坏特征同现浇试件大致等同,预制装配式试件的承载力略低,但刚度退化缓慢;轴压比对试件的承载能力有影响,轴压比越大,现浇试件与预制装配式试件的承载能力越高;设置摩擦接触属性时采用不同摩擦系数对预制试件的承载力影响不大。

For studying the mechanical behavior of the vertical connection joints of prefabricated shear wall construction,taking the full scale wall in practical engineering of a prefabricated shear wall as the research object,the finite element model of cast-in-place and prefabricated reinforced concrete shear wall were established respectively by ABAQUS finite element software,the comparative analysis on mechanical behavior of different axial compression ratio between cast-inplace and prefabricated shear wall was investigated.For prefabricated part,the integrity model was established by setting the frictional contact in the joint seam between the prefabricated and the cast-in-place concrete surface,and the influence of different friction coefficient on the bearing capacity of prefabricated part was studied.The results show that the bearing capacity,deformational characteristics and failure characteristics of prefabricated part are equal to those of cast-in-place part.The ductility of prefabricated specimen is quite good while the bearing capacity is slightly lower;axial compression ratio has influence on the bearing capacity:the higher the axial compression ratio is,the higher the bearing capacity of the part is;the friction coefficient has little effect on the bearing capacity when setting the frictional contact property.