工业化混凝土框架SPC节点抗震性能试验

为研究新型工业化型钢连接混凝土梁柱节点（简称SPC节点）的抗震性能和破坏机理，分别设计制作了一榀SPC中节点及对应的现浇节点，进行了低周往复加载试验。观察了试验现象和破坏特征，对比了节点的滞回曲线、骨架曲线、延性系数、能量耗散指标、强度和刚度循环退化系数、核心区剪切变形、弯矩转角曲线、纵筋应变、型钢应变、节点箍筋应变等。研究表明:相对于现浇节点，SPC节点裂缝数量相当，但其型钢削弱RBS段有效控制了混凝土裂缝宽度；SPC节点的等效屈服荷载略高于现浇节点，但峰值荷载和延性系数得到显著增大；SPC节点的能量耗散系数随位移增加而快速持续增长，强震耗能的优势显著；SPC节点的循环加载强度和刚度退化相比现浇节点更小,具有更稳定的抗震性能。此外，SPC节点的核心区剪切刚度、梁端弯矩承载力和转动能力，均优于现浇节点。最后，文中提出了节点设计建议以供参考。

Experiment on Seismic Performance of SPC Joint for Industrial Concrete Frame

The seismic performance of new type industrial profile steel connecting prefabricated concrete (SPC) frame joint was investigated, and the differences between SPC and traditional monolithic reinforced concrete frame joint were compared. Based on the equality of flexural bearing capacity of beam section, a design method of SPC joint was presented to realize translation of plastic hinge from beam end to the reduction beam section (RBS) of H profile steel without decreasing the flexural bearing capacity. The displacement loading strategy was used and the pseudo static tests were conducted to a monolithic joint and the corresponding SPC joint. Failure characteristic, bearing capacity, deformation capacity, energy dissipation capacity, and strains of key positions were compared between these two specimens. The test results showed that the crack distribution of the SPC joint was similar to that of the monolithic joint, but the maximum crack width of concrete was effectively controlled in the SPC joint. The yielding load of the SPC joint was a little higher than that of the monolithic joint; moreover, the ultimate load and ductility of the SPC joint were significantly increased. Therefore, the SPC joint exhibited better bearing and deformation capacities. The degradation of strength and stiffness of the SPC joint under cyclic loads were both obviously smaller than those of the monolithic joint, and it meant the mechanical behavior of the SPC joint was more stable. The hysteretic curves of the SPC joint were fuller than those of the monolithic joint, and it implied the energy dissipation capacity of the SPC joint was better, especially under a high-intensity earthquake. The realization of the strong column and weak beam mechanism meant that the proposed design method and detail of SPC joint were effective and reasonable. Based on the test results, the seismic performance of the SPC joint was better than that of a traditional reinforced concrete joint. The deformation and damage of SPC joint concentrated on profile steel segment, therefore it can be conveniently repaired and reinforced after an earthquake.