修改的MPA法用于连续刚构桥的抗震性能分析

陈星烨;唐雪松;赵冰

振动与冲击 ›› 2010, Vol. 29 ›› Issue (12) : 93-96.

PDF(872 KB)
PDF(872 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (12) : 93-96.
论文

修改的MPA法用于连续刚构桥的抗震性能分析

  • 陈星烨;唐雪松;赵冰
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Antiseismic performance analysis for a continuous rigid frame bridge by application of modified MPA method

  • CHEN Xing-ye; Tang Xue-song; Zhao Bing
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摘要

弹塑性时程分析方法是计算桥梁结构地震响应较为严格的分析方法,但该方法工作量大,计算复杂,不利于工程师进行结构设计。采用基于模态的Pushover分析方法(MPA法),对某高墩连续刚构桥梁进行抗震性能分析,根据建筑结构设计规范,要求振型参与质量之和需达到90%。通过理论分析,提出以振型贡献率提取振型参与计算的加载模式,剔除振型贡献参与质量比低于1%的振型,对高墩大跨连续刚构桥进行了推覆分析。这样既避免了全部模态参与计算的繁琐,又考虑了高阶振型的影响,并与弹塑性时程响应结果进行了对比。计算结果表明,修改的MPA法(MMPA法)应用于高墩连续刚构桥的抗震性能分析是可行的。

Abstract

Elastic-plastic time-history analysis is a strict method to calculate the seismic response of bridge structures. However, it is not convenient to engineers because it is quite complicated and has a large amount of calculations. To solve this problem, a mode-based pushover analysis method (MPA method) is developed. MPA method is applied to the antiseismic performance analysis of a continuous rigid frame bridge with high piers. According to the construction design codes in China, the sum of participating masses of vibration modes should exceed 90%. Based on the modal participation mass ratios, some high order vibration modes are taken into account in the analysis while those vibration modes with the modal participation mass ratio less than 1% are neglected. In this way, the large number of computations can be avoided while the effect of high order modes can be considered. Thus, MMPS method (modified mode-based pushover analysis method) has been developed. A comparison between the MMPA method and the elastic-plastic time-history method has been made. The result shows that the proposed method (MMPA method) has a satisfactory accuracy. It is an easy-use method for bridge engineers.

关键词

弹塑性时程 / 连续刚构桥 / 高阶振型 / MMPA方法

Key words

Elastic-plastic time-history analysis / continuous rigid frame bridge / high-order vibration modes / MMPA method

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导出引用
陈星烨;唐雪松;赵冰. 修改的MPA法用于连续刚构桥的抗震性能分析[J]. 振动与冲击, 2010, 29(12): 93-96
CHEN Xing-ye;Tang Xue-song;Zhao Bing. Antiseismic performance analysis for a continuous rigid frame bridge by application of modified MPA method[J]. Journal of Vibration and Shock, 2010, 29(12): 93-96

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