Reaction spectrum comparative analysis of seismic performance of 62m concrete-filled steel tube beam bridge with curved string truss before and after reinforcement
首发时间:2019-08-26
Abstract:Taking a 62m concrete-filled steel tube bridge with curved string truss as the research object, according to its reinforcement scheme, the spatial finite element models of the bridge before and after reinforcement were established by using the general finite element software ANSYS. The natural frequencies of the bridge before and after reinforcement were calculated, and the seismic performance of the bridge was analyzed by using the response spectrum method. The results show that the frequencies of the reinforced bridges increase in varying degrees, especially the vertical and torsional frequencies. Before and after reinforcement, the maximum axial force in the upper chord of the bridge is the largest, and the shear force and bending moment are small. The maximum internal force basically appears at the two ends of the upper chord. This position should be regarded as the weak link of the bridge seismic resistance. Under the same cases, the axial force of the bridge after reinforcement is reduced by about 30% compared with that before reinforcement, and the displacement of the bridge after reinforcement is reduced in varying degrees. The reinforcement measures can improve the lateral and vertical stiffness of the bridge, especially the stiffness of the deck system.
keywords: bridge engineering concrete-filled steel tube girder bridge with curved string truss bridge reinforcement natural vibration characteristics seismic response response spectrum analysis
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62m钢管混凝土曲弦桁梁桥加固前后抗震性能反应谱对比分析
摘要:以某62m钢管混凝土曲弦桁架桥为研究对象,依据其加固方案,运用通用有限元软件ANSYS建立其加固前后的空间有限元模型,计算该类型桥梁加固前后的自振频率,并采用反应谱法对比分析其抗震性能。分析结果表明:加固后桥梁的频率值有不同程度的增大,特别是桥梁竖向与扭转频率增幅明显。加固前后桥梁上弦内力中轴力最大,剪力和弯矩较小,内力最大值基本上都出现在上弦两端位置处,此位置应作为桥梁抗震薄弱环节予以重视。在相同工况下,与加固前相比,桥梁加固后的轴力减小约30%,桥梁加固后的位移均有不同程度的减小。加固措施对桥梁横向刚度有所改善,对桥梁竖向刚度有明显提高,特别是对桥面系刚度提高显著。
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62m钢管混凝土曲弦桁梁桥加固前后抗震性能反应谱对比分析
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