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用钢连梁代替混凝土连梁用于混凝土联肢剪力墙,可大大改善联肢墙结构的延性和耗能性能,提高结构抗震能力,但前提是须保证钢连梁与混凝土剪力墙连接节点的可靠性。钢暗柱式墙梁连接节点具有承载力大、刚度大以及能提高剪力墙自身延性等优点。针对内埋钢暗柱式节点形式,基于前期试验数据和正交试验有限元模拟结果,重点研究了此种节点的受力机理以及破坏模式,提炼出关键参数和设计原则,随后建立了这种节点极限承载力的理论模型与计算公式。分析表明,内埋钢暗柱梁墙节点极限承载力主要由3个部分贡献:受拉区钢筋拉力或者钢暗柱截面抗剪强度、钢暗柱埋深部分混凝土压力以及钢暗柱节点域抗剪强度。其中钢暗柱节点域抗剪强度同样由3部分组成:钢暗柱腹板机构、内部混凝土斜压杆机构以及外部桁架机构。通过与试验及精细有限元模型结果进行对比,证明了提出的理论模型简便易行且具有较高精度,所做研究为这种新型节点在工程中的应用提供了简便的设计方法。
The use of steel beams instead of concrete beams for concrete joint shear walls can greatly improve the ductility and energy dissipation performance of the joint wall structure and improve the seismic performance of the structure provided that the steel beams are connected to the concrete shear walls Node reliability. Steel dark-wall beam connection node has the advantages of large bearing capacity, high stiffness and can improve the ductility of the shear wall itself. Based on the previous experimental data and the results of finite element simulation of orthogonal experiment, this paper focuses on the stress mechanism and failure mode of such joints, and extracts the key parameters and design principles. Then, Theoretical Model and Calculation Formula of Joint Ultimate Bearing Capacity. The analysis shows that the ultimate bearing capacity of the embedded steel beam-column wall is mainly composed of three parts: the tensile strength of the tension zone or the shear strength of the steel-dark column, the concrete pressure of the buried depth of the steel column, Shear strength. Among them, the shear strength of steel dark column node domain is also composed of three parts: steel dark column web mechanism, internal concrete bar and bar linkage mechanism and external truss mechanism. By comparing with experimental and finite element model results, it is proved that the proposed theoretical model is simple and convenient and has high precision. The research provided a simple design method for the application of this new type of node in engineering.