外置拱形耗能装置的节段拼装钢管混凝土桥墩抗震性能分析

Seismic performance analysis of sectional assembled steel pipe concrete pier of external arch energy-consuming links

为了进一步推广可恢复功能的预制装配式桥梁结构在中、高烈度地区的应用,减少桥墩的震后损伤及修复成本,提出一种外置拱形耗能装置的节段拼装钢管混凝土(concrete-filled steel tube,CFST)桥墩。基于ABAQUS有限元分析软件建立无耗能装置、外置拱形钢板、外置竖直钢板、外置拱形耗能装置的四节段预制拼装CFST桥墩模型,并在往复位移加载作用下对各模型的抗震性能进行对比分析。研究结果表明:外置拱形耗能装置的预制节段拼装CFST桥墩具有较好的水平承载力、较高的初始刚度以及较强的耗能能力,与外置竖直钢板的节段拼装CFST桥墩相比,其抗侧承载力提升了约11.9%,初始刚度提升了约2.5%;与外置拱形钢板的节段拼装CFST桥墩相比,其抗侧承载力、初始刚度以及耗能能力分别提升了约28.8%、4.6%和13倍;与无耗能装置的预制拼装CFST桥墩相比,其抗侧承载力、初始刚度以及耗能能力分别提升了约39.4%、10.4%和18.1倍;外置拱形耗能装置的预制节段拼装CFST桥墩在整个位移加载阶段残余位移均保持在1 mm之内,偏移率不超过1%,且损伤集中在拱形耗能装置上,能够实现震后的快速修复。

In order to further promote the application of restorable prefabricated bridge structures with recoverable functions in medium and high intensity areas,reduce the post-earthquake damage and repair cost of bridge piers,a precast segmental concrete-filled steel-tube(CFST)bridge pier with external arched energy dissipation links was proposed.Based on the ABAQUS finite element analysis software,a four-section precast segmental CFST bridge pier model of four different structural forms(no energy dissipation link,external arched steel plate,external vertical steel plate,external arched energy dissipation link)was established,and the seismic performance of each model was compared and analyzed under reciprocating displacement loading.The results show that the precast segmental CFST bridge pier of the external arched energy dissipation link has better horizontal bearing capacity,higher initial stiffness and stronger energy consumption capacity.Compared with the precast segmental CFST bridge pier with the external vertical steel plate,the lateral bearing capacity of the precast segmental CFST bridge pier of the external arched energy dissipation link increases by about 11.9%,and the initial stiffness increases by about 2.5%.Compared with the precast segmental CFST bridge piers with the external arched steel plate,the lateral bearing capacity,initial stiffness and energy dissipation capacity increase by about 28.8%,4.6%and 13 times,respectively.Compared with the precast assembled CFST bridge piers without energy dissipation devices,the lateral bearing capacity,initial stiffness and energy dissipation capacity increase by about 39.4%,10.4%and 18.1 times,respectively.Moreover,the residual displacement of the precast segmental CFST bridge pier with the external arch energy dissipation link is maintained within 1 mm in the whole displacement loading stage,and the offset rate is less than 1%,which can improve the rapid recovery of bridge pier after earthquake.