机场高架超宽桥梁抗震性能分析

Seismic Performance Analysis of Airport Elevated ExtraWide Bridges

随着超宽桥梁的广泛应用,对其抗震性能的研究十分必要。云南省某拟建机场高架桥为超宽桥梁,以该超宽桥梁为工程背景,建立空间杆系模型和实体模型,分析其动力特性,在E1、E2地震作用下,结合桥墩的弯矩-曲率曲线,分析其抗震性能,并在E2地震作用下,通过ABAQUS软件建立的实体模型对桥墩进行局部分析。分析表明,该桥在E1地震作用下,处于弹性工作阶段,在E2地震作用下,部分桥墩进入塑性工作阶段,但塑性变形、塑性位移和塑性铰转角均处于合理范围内,且桥墩斜截面抗剪强度均满足要求,表明该超宽桥梁抗震性能良好。

With the wide application of extra-wide bridges,the research on their seismic performance is necessary.A proposed airport viaduct in Yunnan Province is an extra-wide bridge.The article takes this extra-wide bridge as the engineering background,establishes the spatial rod system model and solid model,analyzes its dynamic properties.Under the action of E1 and E2 earthquakes,combined with the bending moment curvature curve of the bridge pier,analyze its seismic performance and performs local analysis of the piers under E2 earthquakes with the solid model established by ABAQUS software.The analysis shows that the bridge is in the elastic working stage under E1 earthquake,and some piers enter the plastic working stage under E2 earthquake,but the plastic deformation,plastic displacement and plastic hinge angle are within reasonable range,and the shear strength of the diagonal section of the piers all meet the requirements,indicating that the seismic performance of this extra-wide bridge is good.