Study on restoring force characteristics of box column-beam connections of weak panel type

为研究弱板式箱形柱-H型梁节点的恢复力特性，进行了各种试验。1.对四个不同板材屈服强度比的十字形试件进行了单调加载试验。对剪裁节点板的试件进行了试验，仅评价了节点板边界单元的恢复力特性。对四个十字形试件进行了循环加载试验。4.进行了两个试件在恒定轴力和循环弯矩作用下的试验。进行了两个叠合梁试件在循环荷载作用下的试验。得到了以下结论。1.通过加入节点板和板边界单元的特性，预测了梁柱节点在单调荷载作用下的恢复力特性。将运动硬化准则应用于单调荷载作用下梁柱节点的恢复力特性，预测了梁柱节点在循环荷载作用下的恢复力特性。3.仅考虑节点的弹塑性性能，对弱板节点试件的荷载-变形关系进行了较好的预测。屈服轴力比为0.2的轴力对梁柱节点的受力性能没有影响。5.受钢筋混凝土板的影响，带组合梁的梁柱节点的强度提高了10个百分点以上。

On the purpose of investigating the restoring force characteristics of the box column-to-H shaped beam connectious of weak panel type, various kinds of experiments were carried out. 1. Four cruciform specimens with various panel yielding strength ratios subjected to monotonic loading were experimented.2. The specimens cut out the joint panels were experimented in aim of evaluating the restoring force characteristics of the panel boundary elements only.3. The cyclic loading experiments of the four cruciform specimens were carried out. 4. Two specimens under constant axial force and cyclic moment were tested.5. Two specimens with composite beams under cyclic loading were experimented. The following conclusions were obtained. 1. The restoring force characteristics of the beam-to-column connections under monotonic loading are predicted by adding the characteristics of the joint panel and the panel boundary elements.2. The restoring force characteristics of the beam-to-column connections under cyclic loading are predicted by applying the kinematic hardening rule to the characteristics under monotonic loading. 3. The load-deformation relations of the specimens with the connections of weak panel type are predicted in good agreement by considering the elasto-plastic behavior of the connections only.4. The axial force of the yielding axial force ratio 0.2 gives no influence on the behavior of the beam-to-column connections. 5. The strength of the beam-to-column connections with composite beams increases over 10 percentages of the strength of the connections without the composite beams by the influence of the reinforced concrete slabs.