长周期地震动对独塔宽幅斜拉桥地震响应的影响
发布时间：2018-12-13 20:43
【摘要】：为了预测独塔宽幅斜拉桥长周期地震响应,以便进行更合理的抗震设计和评估,采用Open SEES软件建立了某独塔宽幅斜拉桥的非线性有限元模型,基于傅里叶变换分析了长周期地震动频谱特性,对比研究了桥梁在远场谐和型地震波、近断层脉冲型地震波、普通地震波以及与设计反应谱匹配的人工地震波作用下的动力响应,并基于能力/需求法对该桥的抗震性能进行了评估。研究表明:长周期地震动对周期为2~4s的独塔宽幅斜拉桥的地震响应具有明显的放大作用,远场谐和型地震波作用下的内力响应为普通地震波的2倍以上,位移响应为普通地震波的18倍以上;主塔塔底截面抗震性能是全桥抗震性能的关键环节,长周期地震动会使塔底截面产生显著的塑性变形,导致主塔和主梁产生大位移,并引发支座破坏;背景工程的横桥向抗震性能比纵桥向更低,且长周期地震动对横桥向抗震性能的影响更明显。
[Abstract]:In order to predict the long-period seismic response of a cable-stayed bridge with single tower and width, a nonlinear finite element model of a cable-stayed bridge with a single tower is established by using Open SEES software in order to carry out more reasonable seismic design and evaluation. Based on Fourier transform, the spectral characteristics of long-period ground motion are analyzed, and the harmonic seismic waves in the far field and the impulsive seismic waves near the fault are compared and studied. The seismic response of the bridge under the action of ordinary seismic waves and artificial seismic waves corresponding to the design response spectrum is evaluated based on the capability / demand method. The results show that the long-period ground motion can amplify the seismic response of the single-tower cable-stayed bridge with a period of 2 ~ 4s, and the internal force response under the action of the far-field harmonic seismic wave is more than 2 times of that of the ordinary seismic wave. The displacement response is more than 18 times of the normal seismic wave. The seismic behavior of the bottom section of the main tower is the key link of the seismic performance of the whole bridge. The long-period ground motion will cause significant plastic deformation of the bottom section of the tower, lead to large displacement of the main tower and main beam, and lead to the failure of the support. The seismic behavior of the transverse bridge is lower than that of the longitudinal bridge, and the effect of long-period ground motion on the seismic performance of the transverse bridge is more obvious than that of the longitudinal bridge.
【作者单位】： 重庆交通大学土木工程学院;重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;
【基金】：重庆市基础与前沿研究计划项目(cstc2015jcyj A30014) 国家自然科学基金资助项目(51408089)
【分类号】：U442.55;U448.27
本文编号：2377210
[Abstract]:In order to predict the long-period seismic response of a cable-stayed bridge with single tower and width, a nonlinear finite element model of a cable-stayed bridge with a single tower is established by using Open SEES software in order to carry out more reasonable seismic design and evaluation. Based on Fourier transform, the spectral characteristics of long-period ground motion are analyzed, and the harmonic seismic waves in the far field and the impulsive seismic waves near the fault are compared and studied. The seismic response of the bridge under the action of ordinary seismic waves and artificial seismic waves corresponding to the design response spectrum is evaluated based on the capability / demand method. The results show that the long-period ground motion can amplify the seismic response of the single-tower cable-stayed bridge with a period of 2 ~ 4s, and the internal force response under the action of the far-field harmonic seismic wave is more than 2 times of that of the ordinary seismic wave. The displacement response is more than 18 times of the normal seismic wave. The seismic behavior of the bottom section of the main tower is the key link of the seismic performance of the whole bridge. The long-period ground motion will cause significant plastic deformation of the bottom section of the tower, lead to large displacement of the main tower and main beam, and lead to the failure of the support. The seismic behavior of the transverse bridge is lower than that of the longitudinal bridge, and the effect of long-period ground motion on the seismic performance of the transverse bridge is more obvious than that of the longitudinal bridge.
【作者单位】： 重庆交通大学土木工程学院;重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;
【基金】：重庆市基础与前沿研究计划项目(cstc2015jcyj A30014) 国家自然科学基金资助项目(51408089)
【分类号】：U442.55;U448.27
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