基于抗氯盐型灌浆料的承插式预制桥墩的抗震性能研究

Research on Seismic Performance of Spigot Prefabricated Pier Based on Chlorine-resistant Grouting Material

为了满足高氯盐环境下承插式预制桥墩的耐久性需求,在灌浆连接部位采用抗氯盐型灌浆料,以改善桥墩根部的防腐性能,并对其抗震性能进行研究。参考实际工程结构,基于有限元软件ABAQUS建立了采用抗氯盐型灌浆料的承插式钢筋混凝土桥墩动力分析模型,对低周往复荷载下的破坏模式、滞回曲线及耗能等进行研究。结果表明,承插式桥墩受震破坏为预制构件连接处混凝土破坏,灌浆料局部发生轻微损坏,但并不会影响结构整体抗震性能。滞回曲线呈饱满的“梭形”,表明结构耗能稳定,该承插式桥墩抗震性能较好。

In order to meet the durability requirements of socketed precast bridge piers under high chloride salt environment,chlorine salt-resistant grout is used in the grouting connection part to improve the corrosion resistance of the root of bridge piers,and its seismic performance is researched.With reference to the actual engineering structure,based on the finite element software ABAQUS,a dynamic analysis model of socketed reinforced concrete bridge piers with chlorine salt-resistant grout is established.And the damage mode,hysteresis curve,and energy dissipation under the low weekly reciprocating load are studied.The results show that the socketed bridge pier seismic damage is the prefabricated components connected to the concrete one,and grout localized damages slightly,but does not affect the overall seismic performance of the structure.Hysteresis curve is full of“shuttle”,indicating that the structural energy consumption is stable,and the socketed bridge pier seismic performance is good.