基于人工地震波作用下大跨度悬索桥多点激励地震响应分析

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英文篇名：Seismic Response of Long-span Suspension Bridges under Multi-support Excitation Based on Artificial Seismic Waves 作者：易富 ; 杜常博 ; 王伟 ; 孙悦 ; 张智 英文作者：YI Fu;DU Changbo;WANG Wei;SUN Yue;ZHANG Zhi;College of Architecture and Transportation, Liaoning Technical University;College of Civil Engineering, Liaoning Technical University; 关键词：地震响应 ; 人工地震波 ; 一致激励 ; 多点激励 ; 影响振型 英文关键词：seismic response;;artificial seismic wave;;uniform excitation;;multi-support excitation;;influential vibration mode 中文刊名：ZBDZ 英文刊名：China Earthquake Engineering Journal 机构：辽宁工程技术大学建筑与交通学院;辽宁工程技术大学土木工程学院; 出版日期：2019-04-15 出版单位：地震工程学报 年：2019 期：v.41 基金：国家自然科学基金资助项目(51774163) 语种：中文; 页：ZBDZ201902002 页数：8 CN：02 ISSN：62-1208/P 分类号：14-21

摘要

为研究大跨度悬索桥在多点激励作用下的地震响应规律,在已有的功率谱模型基础上提出了改进的功率谱模型,并将其应用到人工地震波合成过程中。以某水库上主跨720 m双塔单跨悬索桥为研究对象,用Midas civil建立全桥有限元模型,采用大质量法进行不同波速多点激励地震响应分析。结果表明:大跨度悬索桥在多点激励作用下的主塔内力响应、主塔位移响应及主梁位移响应均受行波效应、衰减效应、不相干效应及衰减后地震波叠加效应影响,且最终的响应值由衰减后地震波的叠加效应与衰减效应的共同作用决定;500 m/s多点激励下衰减后的地震波叠加加强效应与衰减效应共同作用后,对主塔轴力响应、主塔塔底顺桥向剪力响应、左塔上横梁处剪力和弯矩响应的加强效果最大;各波速多点激励下,主塔顶顺桥向位移响应相对变化率均大于零且几乎保持不变,主梁两端顺桥向位移响应相对变化率在1 000 m/s波速取得最大值,主梁竖向位移响应在500 m/s取得最大值并随波速的增加逐渐接近一致激励情况。
        To study the seismic response of long-span suspension bridges under multi-support excitation, an improved power spectrum model based on an existing power spectrum model is proposed and applied to the synthetic process of artificial seismic waves. A full-bridge finite element model for the suspension bridge with a main span of 720 m over a reservoir was established with Midas civil, and the seismic response of the bridge under multi-support excitation and different wave velocities was analyzed with a large-mass method. The results showed that under multi-point excitation, the internal force response and displacement response of the main tower and the displacement response of the main beam of the long-span suspension bridge are all affected by the traveling wave effect, the attenuation effect, the incoherence effect, and the superposition effect of seismic waves after attenuation, and the value of final response is determined by the combined effects of attenuation and superposition of seismic waves. Under 500 m/s multi-point excitation and the combined effects of superposition and attenuation of the seismic wave after attenuation, the axial force response of the main tower, the longitudinal shear response at the bottom of main tower, and the shear force and bending moment response at the beam of the left tower showed the maximum reinforcement effect. Under multi-point excitation and different wave velocities,(1) the relative variance rate of longitudinal displacement response of the main tower was greater than zero and almost unchanged;(2) the relative variance rate of longitudinal displacement response at the two sides of main beam reached maximum value when the wave velocity was 1 000 m/s; and(3) the vertical displacement response of the main girder reached the maximum value at 500 m/s, and was gradually close to than under uniform excitation with the increase of wave velocity.

引文

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