钢梁与PEC柱组合结构的抗震性能分析

对钢梁与PEC柱半刚性连接组合结构进行抗震性试验研究,共设计了4榀不同连接类型的整体框架试件。通过施加低周水平反复荷载,研究钢梁与PEC柱组合结构的协同工作性能,分析端板厚度、角钢设置、螺栓间距等因素对整体框架抗震性能的影响。试验结果表明:组合结构屈服机制符合"强柱弱梁"的抗震设计要求,梁顶翼缘变形严重并形成塑性铰,柱根部鼓曲进入塑性。增加端板厚度和减小螺栓间距可以增大转动延性、提高承载极限、改善初始刚度;各框架延性性能良好,其位移延性系数均大于2.6,且端板连接的框架延性高于角钢连接的框架;等效粘滞阻尼系数he的数值在0.84～1.14之间,各框架抗震性能良好。

Analysis of theAnti-seismic Performance of the Composite Structure of Steel Beam and PEC Column

In this study, the anti-seismic performance test of semi-rigid composite structures with steel beam and PEC column is conducted, and four integral frame specimens with different connection types are designed. The coordinate performance of the composite structure of steel beam and PEC column is studied by application of repeated low-cycle horizontal loads, and the effect of end plate thickness, angle steel setting, bolt spacing and other factors on the anti-seismic performance of the whole frame is analyzed. The test results show that the yield mechanism of the composite structure conforms to the anti-seismic design requirements for "strong column and weak beam", and the top flange of the beam deforms seriously and forms plastic hinge, and the root of the column bends into plasticity. Increasing the thickness of the end plate and reducing the bolt spacing can increase the rotational ductility, increase the bearing limit, and improve the initial stiffness. The ductility of each frame is good, the displacement ductility coefficient is greater than 2.6, and the ductility of the frame connected by end plate is higher than that connected by angle steel. The value of the equivalent viscous damping coefficient he ranges from 0.84 to 1.14, and the anti-seismic performance of each frame is good.