华南理工大学学报(自然科学版) ›› 2008, Vol. 36 ›› Issue (11): 101-107.

• 土木建筑工程 • 上一篇    下一篇

多点激励下大跨度桥梁的地震反应

苏成1 陈海斌2   

  1. 1. 华南理工大学 亚热带建筑科学国家重点实验室, 广东 广州 510640; 2. 广东省 建筑设计研究院市政所, 广东 广州 510010
  • 收稿日期:2008-01-04 修回日期:2008-07-13 出版日期:2008-11-25 发布日期:2008-11-25
  • 通信作者: 苏成(1968-),男,博士,教授,博士生导师,从事结构工程和桥梁工程等方面的研究. E-mail:cvchsu@scut.edu.cn
  • 作者简介:苏成(1968-),男,博士,教授,博士生导师,从事结构工程和桥梁工程等方面的研究.

Seismic Response of Long-Span Bridge Under Multi-Support Excitation

Su Cheng1  Chen Hai-bin2   

  1. 1. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. Division of Municipal Engineering, Guangdong Architectural Design and Research Institute, Guangzhou 510010, Guangdong, China
  • Received:2008-01-04 Revised:2008-07-13 Online:2008-11-25 Published:2008-11-25
  • Contact: 苏成(1968-),男,博士,教授,博士生导师,从事结构工程和桥梁工程等方面的研究. E-mail:cvchsu@scut.edu.cn
  • About author:苏成(1968-),男,博士,教授,博士生导师,从事结构工程和桥梁工程等方面的研究.

摘要: 大跨度桥梁跨越尺度较大,其墩柱基础所处地质条件存在差异,不同墩柱间的地震动输入存在时间差,因此在进行地震反应分析时需考虑多点激励效应.文中基于大质量法的计算原理,在通用有限元程序Strand7平台上实现了多点激励下大跨度桥梁的地震反应分析.在此基础上分别考察了一座主跨428m的三跨连续中承式钢拱桥在一致激励、行波激励和多点激励下的地震反应规律.结果表明,行波激励和多点激励对大跨度拱桥的地震反应有较大影响,应予以考虑.

关键词: 大跨度桥梁, 抗震分析, 一致激励, 行波效应, 多点激励

Abstract:

For long-span bridges, there exists obvious time difference in seismic input among different piers due to different geological conditions of the pier base. Thus, the multi-support excitation effect should be taken into consideration in the analysis of seismic response. In this paper, based on the large-mass method, the seismic responses of long-span bridges under multi-support excitation are analyzed on the platform of commercial finite element program Strand7. Afterwards, the seismic responses of a three-span continuous middle-supported steel arch bridge with a main span of 428m are analyzed under different input conditions such as uniform excitation, traveling wave excitation and muhi-support excitation. The results indicate that the traveling wave excitation and the multi-support excitation should be considered in the seismic analysis because both of them have significant influence on the seismic responses of long-span arch bridges.

Key words: long-span bridge, seismic analysis, uniform excitation, traveling wave effect, multi-support excitation