预制钢骨混凝土柱——钢梁组合节点试验研究

Experimental research on prefabricated steel-reinforced concrete column to steel beam composite joints

针对装配式混凝土结构中梁柱节点连接构造复杂、施工效率低等问题,设计开发了一种预制钢骨混凝土柱—钢梁组合节点,通过拟静力试验,研究不同梁端连接方式对新型节点抗震性能的影响。结果表明:不同梁端连接方式的节点试件均为梁端受弯破坏,破坏位置在翼缘连接板处,实现了节点域附近塑性铰外移的效果;翼缘连接板和混凝土的应变受梁端连接方式的影响较大,钢梁腹板、H型钢骨和纵向钢筋的应变受到的影响相对较小;栓焊混合节点和螺栓节点属于半刚性连接,焊接节点属于刚性连接;各试件的滞回性能良好,承载力和刚度退化性能稳定,延性系数在4.03~11.84之间,等效黏滞阻尼系数在0.24~0.36之间。该类型节点具有良好的承载能力和抗震性能,能满足现有抗震设计要求。

Aiming at the problems of complicated beam-column connection structure and low construction efficiency in prefabricated concrete structures.Designed and developed a new type of prefabricated steelreinforced concrete column to steel beam composite joint,and the influence of different beam end connection methods on the seismic performance of the new joint was studied by the pseudo-static test.The results show that the specimens with different beam end connections are all flexural failure,and the failure location is at the flange connecting plate,which realizes the effect of the plastic hinge moving out near the joint region.The strain of the flange connection plate and concrete is greatly affected by beam end connection mode,while the effect to strain of the steel beam web,H-shaped steel skeleton,and longitudinal reinforcement are relatively small.The bolt-weld hybrid joint and bolt joint belong to semi-rigid connections,while the weld joint belongs to rigid connections. The hysteretic behavior of each specimen is good, and the degradation performance of bearingcapacity and stiffness is stable. The ductility coefficient is 4.03-11.84, and the equivalent viscous dampingcoefficient is 0.24-0.36. This type of joint has good bearing capacity and seismic performance, which can meetthe existing seismic design requirements.