Abstract

A comparison test between a precast concrete middle column joint and another cast-in-place middle column joint is presented. A keyed joint is used between the beam and the column for the precast beam-to-column joint. The beam longitudinal rebar is connected by rolling straight thread sleeve. The two full-scale specimens are tested when subjected to cyclic loading. The seismic behavior of a prefabricated beam-to-column joint is studied, including the failure mode, hysteretic curves, skeleton curves, ductility and energy dissipation. The test results show that the mechanical performance of the precast concrete joint is reliable, and its seismic performance is similar to that of the cast-in-place joint. The test also shows that the contribution of the steel rebar in the floor slab for the negative bending moment bearing capacity of the beam is remarkable and cannot be ignored. Otherwise, the requirements of the “strong column weak beam” concept cannot be met.

摘要

介绍了预制混凝土中柱节点与另一种现浇中柱节点之间的对比试验。预制梁柱接头在梁和柱之间使用键接接头。梁纵筋采用滚压直螺纹套筒连接。在承受循环载荷时测试两个全尺寸试样。研究了预制梁柱节点的抗震性能，包括破坏模式、滞回曲线、骨架曲线、延性和能量耗散。试验结果表明，预制混凝土接头力学性能可靠，抗震性能与现浇接头相近。试验还表明，楼板中的钢筋对梁的负弯矩承载力的贡献是显着的，不容忽视。否则无法满足“强柱弱梁”概念的要求。