采用套筒连接的预制桥墩抗震性能试验研究

Experimental Study on Seismic Performance of Precast Bridge Pier With Grouted Splice Sleeve

通过对套筒预埋位置不同的预制立柱试件进行拟静力试验,并与现浇立柱作对比,研究灌浆套筒连接预制拼装桥墩的抗震性能.分析比较了此类构造下混凝土桥墩的损伤部位、损伤发展过程和最终破坏形态,并定量地从滞回曲线、骨架曲线、刚度、延性、耗能等方面详细分析了试件的抗震性能.结果表明:不同预埋位置灌浆套筒的预制试件在损伤形式和塑性铰形成上有所不同,但试件抗震性能总体相近;预制试件损伤均小于现浇试件,且主要集中在接缝处;预制试件各项性能参数不弱于现浇试件,合理设计下可满足预期的抗震要求.

In order to study the seismic performance of precast segmental bridge pier with grouted sleeve, two pier models with different sleeve-fixed positions and one cast-in- place benchmark were used to conduct pseudo-static tests. The damage area, damage development and failure mode of the models were observed. And their seismic performance was summarized by analyzing hysteresis curves, skeleton curves, stiffness, ductility and energy dissipation. The results show that two pier models with different sleeve-fixed positions share similar seismic performance in spite of difference in damage mode and plastic-hinge mechanism the damage of precast pier models is slighter and focuses on the area of segmental interface precast pier models are emulative considering various seismic performance parameters and their performance is able to meet seismic demand.