钢管混凝土柱-预应力混凝土梁节点抗震性能试验

摘要

Based on tests of three specimens under low cycle reversed loading ,the failure pattern , hysteretic loops ,stiffness degradation and energy dissipation capacity of connections between concrete‐filled steel tubular columns and prestressed concrete beams were studied .The results show that prestress almost has no influence on the failure pattern of specimen ,and all specimens are subjected to bending failure at beam end .When the lower part of beam is in tension ,prestress makes stiffness degradation accelerate , and energy dissipation capacity is reduced . When the upper part of beam is in tension ,the ultimate bearing capacity ,stiffness degradation ,ductility and energy dissipation capacity of prestressed specimens is better than that of non‐prestressed specimens .%通过对3个试件的低周反复荷载试验，研究了不同预应力对钢管混凝土柱‐预应力混凝土梁节点的破坏形态、滞回曲线、刚度退化、耗能能力等的影响。结果表明：预应力对试件的破坏类型几乎没有影响，破坏均为梁端受弯破坏；梁下部为受拉区时，预应力的施加使刚度退化加快，耗能性能降低；梁上部为受拉区时，预应力试件极限承载力较非预应力试件更高，刚度退化和延性、耗能性能略比非预应力试件好。