装配式剪力墙竖向焊接节点抗剪性能

Shear Behavior of Vertical Welded Connection in Precast Shear Wall

为了对装配式剪力墙结构节点干式连接方案进行研究,在已有研究成果新型预制复合墙板体系的基础上提出了采用焊接连接的装配式剪力墙干式节点方案,并通过两批共5个焊接节点试件的单调静力加载试验来考察竖向节点的抗剪性能和变形能力.试验表明,节点试件具有较好的抗剪性能和变形能力;试件破坏始于节点周围区混凝土出现裂缝,终于连接钢板和锚筋剪断致使节点试件失去承载能力.在此基础上通过ABAQUS有限元分析软件对节点试件受力过程进行了模拟,并对各种材料参数进行了详细比较和分析.通过比较可知该类节点抗剪性能和变形能力主要由连接钢板、锚筋抗剪承载力和节点周围区混凝土抗压承载力决定,纵筋、箍筋、预埋钢板等材料参数变化对节点试件影响不大.最终,得到了竖向节点焊接连接方案可用于装配式剪力墙结构节点连接之中的结论.

To study the dry connections in precast shear wall structure,this paper presented a welded connection approach for precast shear wall vertical joint based on an existing advanced prefabricated composite wall system.By manufacturing and testing 5 specimens under monotonic static loadings,the shear pattern and deformability of the dry connection were studied.The results showed that the welded connection has a good shear patterns and deformability.The failure of the specimens began with the concrete cracks around the joints,and shear failure ultimately occurred in the connecting steel plates and anchor bars.Then,detailed analysis and comparison of material parameters were conducted by using finite element analysis software ABAQUS.It was observed that shear pattern of the welded connection was mainly determined by shear resistance of connecting steel plates,shear resistance of anchor bars,and compressive resistance of the concrete around pre-embedded steel plate,while longitudinal reinforcement,stirrup and pre-embedded steel plate had limited impact.It is concluded that this welded connection approach can be utilized for the vertical joint of precast shear wall.