配置大直径大间距HRB500高强钢筋的装配整体式钢筋混凝土框架节点抗震性能试验研究

通过对4个配置大直径大间距HRB500高强钢筋的装配整体式钢筋混凝土框架梁柱节点的低周反复加载试验，研究其开裂过程、破坏形态以及滞回特性、骨架曲线、延性与耗能能力等。结果表明：4个梁柱节点试件均表现为梁端塑性铰区的弯曲破坏，节点区处于弹性状态；节点整体性能良好，具有较好的延性和耗能能力；与普通配筋形式相比，大直径大间距的配筋形式对梁柱节点性能影响不明显；大直径钢筋在节点区采用锚固板机械锚固形式安全可靠。

Experimental study on seismic performance of precast RC frame joints with HRB500 high strength rebars of large diameter and spacing

Four precast RC frame joints with HRB500 high strength rebars of large diameter and spacing were tested under low cyclic loading. The crack propagation process, failure modes, hysteretic behaviors, skeleton curves, ductility, and energy dissipation were investigated. The results indicate that the flexure failure occurs in the plastic zones at the ends of the beams while the joint region generally remains elastic. The joints show good integrity, relatively good ductility and energy dissipation capacity. Comparing to the normal reinforcement form, the performances of the joints with reinforcements of large diameter and spacing are equivalent. The mechanical anchorage approach used to anchor beam rebars in joints is proved to be safe and reliable.