空间钢-混凝土组合节点抗震性能试验研究

多高层住宅钢结构建筑中，采用剪力墙边缘构件与钢梁连接的等宽度设计，可避免室内凸柱现象，能获得整洁的室内空间，但使墙边缘构件-梁连接节点设计的难度增加。为此，该文结合波形钢板-混凝土组合墙构成特点，提出了墙边缘构件与梁连接采用上翼缘环板节点、下翼缘贴板节点的组合型式，并进行了2个不同轴压比组合节点的滞回加载试验，研究其承载性能、破坏模式、滞回性能、骨架曲线、强度和刚度退化等。试验发现，两个试件的屈服位移角平均值为1/136，极限位移角为1/42，均能满足《建筑抗震设计规范》(GB 50011−2010)中弹性和弹塑性层间位移角的要求；下翼缘贴板节点弱于上翼缘外环板节点的变形能力，而且贴板节点连接焊缝易于开裂；一旦贴板节点达到承载力极限，之后强度和刚度迅速退化。该文建立了组合节点的实体-壳单元的精细化有限元模型，进行了试验加载全过程分析。比较了节点试验与有限元分析结果，利用该文建立的有限元模型开展分析，为贴板节点设计提供了依据。

Experimental seismic behaviour of bottom-through-diaphragm and top-ring connection to SST columns

In residential steel building structures, the identical depth design among joints and, the boundary element of steel plate shear wall and I-beam can lead to a required interior space, but it makes the joint design more difficult. A combination type of the joint connecting the boundary element with the I-beam was proposed, with an external-diaphragm connection on the upper flange and with a flitch plate connection on the lower flange of I-beam. The hysteretic tests of two specimens with different axial compression ratios were carried out to study their load-bearing performance, failure mode, hysteretic performance, skeleton curve and, strength and stiffness degradation. The test results indicated that: The average yield displacement angle of 1/136 and limit displacement angle of 1/42 both could meet the specified requirements in Chinese Code for the seismic design of buildings GB 50011−2010; The deformability of the flitch plate connection on the lower flange is weaker than that of the external-diaphragm connection on the upper flange; The cracking is prone to occur in the weld seam of the flitch plate connection, resulting in the strength and stiffness degrade rapidly. A refined finite element model including all details of connecting joints was established and the tests are simulated numerically. A good agreement between the test and finite element results was reached, and the investigation of the validated finite element model could provide fundamentals for establishing the design methods of the flitch plate connection.