预制拼装混凝土双柱墩抗震性能试验

Experimental Study on Seismic Performance of Precast Double Column Piers

目的研究预制混凝土双柱墩的抗震性能,为该类桥墩抗震设计及工程应用提供参考。方法开展预制装配式双柱墩和现浇双柱墩往复加载试验,观察试验过程中两者的裂缝开展和破坏形态,并对滞回曲线、残余位移、刚度、累计耗能和延性等参数进行对比。结果与现浇墩底部裂缝较为均匀的状况相比,预制双柱墩墩底灌浆套筒位置接缝张开较为明显,预制双柱墩与现浇双柱墩滞回曲线均较为饱满,具有良好耗能能力;预制双柱墩峰值承载力和极限位移分别为现浇墩对应值的91.6%和88.4%,总体耗能性能稍弱于现浇双柱墩。结论预制混凝土双柱墩抗震性能指标与现浇双柱墩相比,差值均为10%左右,没有明显差异;预制混凝土双柱墩具有良好的整体性和抗震性能。

In order to provide reference for seismic design and engineering application of the precast double column pier,the seismic performance of this type of pier was studied.Tests of cast-in-place double column pier and precast double column pier models under cyclic load were carried out.Through experiments,the crack development and failure mode of piers during loading were observed,and the force-displacement curve,residual displacement,stiffness,cumulative energy consumption and ductility were compared.The results show that the joints of the grouting sleeve at the bottom of the precast double column pier are obviously open,and the cracks at the bottom of the cast-in-place pier are more uniform than that at the bottom of the cast-in-place pier.The hysteretic curves of precast double column pier and cast-in-place double column pier are full and have good energy absorption capacity.The peak force and ultimate displacement of precast double column pier are 91.61%and 88.43%of that of cast-in-place pier respectively.The overall energy consumption performance of precast double column pier is slightly weaker than that of cast-in-place pier.Compared with cast-in-place double column pier,the difference of seismic performance index of precast double column pier is not significant,for which is within 10%.Precast double column pier has good integrity and seismic performance.