波纹腹板钢−混组合箱梁抗震性能研究

对3榀不同剪力连接度的波纹腹板钢?混凝土组合箱梁进行竖向低周反复荷载作用下的力学性能试验研究,重点对组合箱梁的破坏形式、滞回曲线、骨架曲线、延性、耗能能力、刚度退化规律等抗震性能进行试验分析。研究结果表明:在低周反复荷载作用下,波纹腹板钢?混凝土组合箱梁主要有弯曲破坏和弯剪破坏2种破坏形式;荷载?位移滞回环较为饱满,无明显捏缩现象,具有较好的抗震性能;骨架曲线可分为近似弹性、弹塑性和破坏3个阶段;随着剪力连接度的增大,极限位移、破坏位移显著增大,试件耗能能力显著增加,适当增加波纹腹板钢-混凝土组合箱梁的剪力连接度,可有效提高其耗能能力;具有较好的延性,有利于震后的正常使用和修复;由于损失积累,使得正向耗能能力高于反向耗能能力;刚度退化前期受参数影响较为敏感,后期退化规律趋于平缓。

Study on seismic performance of steel-concrete composite box girder with corrugated web

The mechanical properties of 3 trusses of corrugated webs steel-concrete composite box girders with different shear connections were tested under vertical low cyclic loading.The seismic properties of the composite box girders,including failure mode,hysteresis curve,skeleton curve,ductility,energy dissipation capacity and stiffness degradation,were analyzed.The results show that the corrugated web steel-concrete composite box girder under low cyclic loading has two failure modes:Bending failure and bending shear failure.The load-displacement hysteresis loop is full,without obvious shrinkage,and has good seismic performance.The skeleton curve can be divided into three stages:Approximate elasticity,elastic-plastic and failure.With the increase of shear connection degree,the ultimate displacement and failure displacement increase significantly,and the energy dissipation capacity of the specimen increases significantly.If the shear connection degree of corrugated web steel-concrete composite box girder is appropriately increased,the energy dissipation capacity can be effectively improved.The better ductility is beneficial to the normal use and repair after the earthquake.Due to the accumulation of loss,the forward energy dissipation capacity is higher than the reverse energy dissipation capacity.Stiffness degradation is sensitive to the influence of parameters in the early stage,and the degradation tends to be gentle in the late stage.