典型铁路梁桥抗震设计地震动破坏势排序

胡进军1,樊圆2,来庆辉1,谢礼立1

振动与冲击 ›› 2020, Vol. 39 ›› Issue (11) : 14-21.

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (11) : 14-21.
论文

典型铁路梁桥抗震设计地震动破坏势排序

  • 胡进军1,樊圆2,来庆辉1,谢礼立1
作者信息 +

Ranking the damage potential of input ground motions for typical railway beam bridge

  • HU Jinjun1,  FAN Yuan2, LAI Qinghui1, XIE Lili1
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文章历史 +

摘要

输入地震动的选取是桥梁抗震分析中的重要环节,不同的输入地震动引起的桥梁结构反应有显著差异。为了对铁路桥梁抗震设计地震动的选择提供定量依据,本文将“最不利设计地震动”的概念拓展并应用到桥梁抗震领域,研究典型铁路梁桥在不同地震动作用下的结构响应,得到基于结构相应参数的输入地震动破坏能力排序。本文首先确定了桥梁地震动输入以及评价指标,使用OpenSees对桥墩模型输入大量地震动记录进行有限元分析,通过调幅手段研究幅值与单一参数的关系,并引入颜色映射理论研究幅值与多参数的关系。研究表明:(1)当较低幅值地震动作用在结构上时,结构的地震响应与第一周期反应谱值相关性最好;(2)随着幅值的增加,结构周期增长,地震响应与更长周期反应谱值以及速度、位移参数、持时参数等的相关性会逐步提高;(3)通过动力时程计算并对墩顶位移进行比较,给出了模型在设定地震作用下的排序,结果可为相关桥梁结构的输入地震动选取提供参考。

Abstract

Research purposes:Selection of input ground motion is critical in seismic analysis of bridges. The concept of “the most unfavorable design ground motion” has been widely used in building structures. This paper extends this concept to the field of bridges to study the sequence of structural responses of bridges under ground motion excitation. In this paper, different ways of measuring input ground motion and the damage index are introduced. The OpenSees finite element analysis is used to input a large number of ground motion records into the pier model. The relationship between amplitude and single parameter is studied by means of strip method. The relationship between amplitude and multi-parameter is studied by introducing color mapping theory.
Research conclusions:(1) When the lower amplitude ground motion occurs, the results are obtained. The correlation between the seismic response and the response spectrum of the first period is the best when applied to the structure; (2) with the increase of the amplitude, the period of the structure increases, the correlation between the seismic response and the response spectrum of the longer period, as well as the velocity, displacement and duration parameters will gradually increase; (3) the displacement of the pier top was compared through the dynamic time history calculation. Comparing with this model, the records of the model under the peak ground motion are given. For structure similar to the model in this paper, the records can be used as the input design ground motion.

关键词

铁路梁桥 / 最不利设计地震动 / 输入地震动 / 地震反应 / 排序

Key words

Railway beam bridge / the most unfavorable design ground motion / input ground motions / seismic response / ranking

引用本文

导出引用
胡进军1,樊圆2,来庆辉1,谢礼立1. 典型铁路梁桥抗震设计地震动破坏势排序[J]. 振动与冲击, 2020, 39(11): 14-21
HU Jinjun1, FAN Yuan2, LAI Qinghui1, XIE Lili1. Ranking the damage potential of input ground motions for typical railway beam bridge[J]. Journal of Vibration and Shock, 2020, 39(11): 14-21

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