模块化装配式钢连梁-混合联肢墙节点抗震性能研究

Study on seismic performance of joint with modular prefabricated steel coupling beam-hybrid coupled wall

借鉴模块化装配式多高层钢结构的优势,提出一种全螺栓连接的模块化装配式钢连梁-混合联肢墙结构体系。为研究该体系梁墙连接节点的受力性能,设计了6个该类型节点、1个暗柱焊接节点和1个端板螺栓连接节点,并利用有限元软件ABAQUS建立了节点的有限元模型,基于已有试验进行了验证。在此基础上研究了连接方式、变形形态、端板厚度对节点抗震性能的影响。研究表明,模块化装配式钢连梁具有较高的承载力及延性,当钢连梁设计为弯曲屈服时,螺栓连接节点中翼缘相对位移由翼缘螺栓抗拉承担,螺栓变形较小,传力效率较高,更容易形成受力明确的屈服耗能段。当钢连梁为剪切屈服时,由于钢连梁腹板接触面的相对滑移,传力效率降低,刚度退化较快。端板设置能够有效抑制节点区混凝土开裂速度,显著提高节点后期刚度,对节点抗震性能有明显改善。

Based on the advantages of modular prefabricated multi-story steel structure,a full-bolt-connected modular steel coupling beam-hybrid coupled wall system was proposed. In order to study the mechanical behavior of joint,6 types of joints,1 welded joints with concealed columns and 1 end plate bolted joints were designed. The finite element model of the joint was established by using the finite element software ABAQUS,which has been verified based on the existing tests. The influence of connection mode,deformation shape and thickness of end plate on the seismic behavior of joints was studied. The research shown that the modular steel coupling beams have higher bearing capacity and ductility. When the steel coupling beam was designed to bend yielding,the relative displacement of the flange in the bolt connection node was borne by the flange bolt,the bolt deformation was smaller,the transmission efficiency was higher,and it was easier to form a stress yielding energy dissipation section. When the steel coupling beam was designed to shear yielding,because of the relative slippage of the interface of the steel coupling beam,the transmission efficiency decreases,and the stiffness degradation was faster. The end plate setting could effectively restrain the cracking speed of the concrete in the joint area,significantly improved the post stiffness and seismic performance of the joints.