简支梁桥顺桥向地震动分析

周勇军; 彭晓彬; 赵煜; 宋一凡; 贺拴海

简支梁桥顺桥向地震动分析

1.
长安大学桥梁与隧道陕西省重点实验室, 陕西西安 710064
2.
湖北省交通规划设计院, 湖北武汉 430051

基金项目:

国家西部交通建设科技项目 2007 318 812 32

详细信息

作者简介:
周勇军(1978-), 男, 湖北孝昌人, 长安大学讲师, 工学博士, 从事桥梁结构动力分析

中图分类号: U442.55
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- 文章访问数: 197
- HTML全文浏览量: 66
- PDF下载量: 491
- 被引次数: 0
出版历程
- 收稿日期: 2007-06-09
- 刊出日期: 2007-12-25

Analysis of longitudinal seismic vibration for simply-supported beam bridge

1.
Key Laboratory for Bridge and Tunnel of Shaanxi Province, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Communications Planning and Design Institute of Hubei Province, Wuhan 430051, Hubei, China

More Information

Author Bio:
Zhou Yong-jun(1978-), male, EngD, lecturer, + 86-29-82334872, zyj@gl.chd.edu.cn

摘要

摘要: 为了计算多跨简支梁桥地震荷载, 根据弹性地基上桥墩的变形特性, 将墩顶作用单位集中力时, 桥墩静力挠度曲线方程作为基本振型, 考虑了地基变形的影响, 利用拉格朗日方程推导了多跨简支梁桥顺桥向地震振动方程, 给出了相应的基频和振型参与系数的近似计算公式。仿真计算结果表明: 简支梁桥一、二阶自振频率的计算值分别为7.43及11.19 Hz, 而其试验值分别为7.00及10.55Hz, 其误差在5.8%以内。可见, 提出的振型可以用于简支梁桥顺桥向的抗震性能评估。
- 桥梁工程 /
- 简支梁桥 /
- 地震荷载 /
- 拉格朗日方程 /
- 地基变形 /
- 基频
Abstract: In order to compute the seismic loads of multi-span simply-supported beam bridge, according to the deformation behavior of piers sited on elastic foundations, pier's deflection function was taken as the fundamental vibration mode, it was derived under unit force acting on pier's top, the effect of foundation deformation was taken into account, the longitudinal seismic vibration equation of the bridge was deduced by Lagrange function, and the approximate formulas of its fundamental frequency and participation factors were put forward.Simulated result shows that the first and second calculated vibration frequencies are 7.43 and 11.19 Hz respectively, and their corresponding test values are 7.00 and 10.55 Hz respectively, their errors aren't more than 5.8%, which demonstrates that the mode is appropriate for assessing the longitudinal seismic performance of the bridge.
- bridge engineering /
- simply-supported beam bridge /
- seismic load /
- Lagrange function /
- foundation deformation /
- fundamental frequency

HTML全文

图 1 计算模式1

Figure 1. Calculation mode 1

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图 2 计算模式2

Figure 2. Calculation mode 2

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图 3 试验模型

Figure 3. Test model

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图 4 试验振型

Figure 4. Test vibration modes

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表 1 频率对比

Table 1. Comparison of frequencies

振型序列	振型描述	试验值/Hz	计算值/Hz	误差/%
第一阶	两桥墩同向振动	7.00	7.43	5.8
第二阶	两桥墩反向振动	10.55	11.19	5.7

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