基于性能的桥梁抗震设计中考虑持时的实际地震波优化选择方法

陈亮;任伟新;张广锋;左小晗;黄勇

振动与冲击 ›› 2015, Vol. 34 ›› Issue (3) : 35-42.

PDF(1901 KB)
PDF(1901 KB)
振动与冲击 ›› 2015, Vol. 34 ›› Issue (3) : 35-42.
论文

基于性能的桥梁抗震设计中考虑持时的实际地震波优化选择方法

  • 陈亮,任伟新,张广锋,左小晗,黄勇
作者信息 +

An Optimal Method for Selecting Real Earthquake Ground Motions Considering Duration for Performance-Based Seismic Design of Bridges

  • CHEN Liang REN Wei-xin ZHANG Guang-feng ZUO Xiao-han HUANG Yong
Author information +
文章历史 +

摘要

在基于性能的桥梁抗震设计(PBSD)中,是否考虑持时的效应会显著影响到分析结果的精确性。为了将持时与幅值、频谱的影响进行解耦,选择多组匹配同一目标谱的实际地震波和人工波,并使各组地震波的5-95%显著持时服从不同的概率分布,对一座钢筋混凝土连续梁桥进行IDA分析。对比持时与桥梁结构地震需求的相关性表明:持时的均值、离散度及其概率分布对于位移工程需求参数(EDP)影响较小,但对能量EDP以及包含能量项的疲劳破坏和累积损伤参数的概率预计(均值)、离散度及其概率分布影响显著。因此,在PBSD中如采用能量EDP,则必须考虑到所选地震波的持时均值、离散度及其概率分布均要符合工程场地实际的地震危险性。在此基础上,针对基于全概率理论的PBSD,提出一种能够考虑持时均值、离散度及其概率分布影响的实际地震波优化选择方法,能够显著提高分析结果的精确性和计算效率。

Abstract

The duration of earthquake ground motions have insignificant effects on analytical results for performance-based seismic design of bridges (PBSD). The incremental dynamic analysis of a six span reinforced concrete continuous girder bridge was performed for decoupling the influence between duration, frequency content and amplitude on structural seismic demands by using several bins of real and artificial accelerograms that matched the same target response spectrum and had different probability distributions of the 5-95% significant duration. The correlation between duration and seismic demands of the RC girder bridge reveals that the mean, dispersion and probability distribution of the duration of earthquake ground motions have little influence on displacement engineering demand parameters (EDP) but important effects on the probabilistic assessment (mean), dispersion and probability distribution of energy EDPs or fatigue failure and cumulative damage parameters. If energy EDPs are used in PBSD, the mean, dispersion and probability distribution of the duration of earthquake ground motions must be in accordance with the real seismic hazard at the bridge site. An optimal method for rationally selecting real earthquake ground motions for PBSD based on total probability theorem is presented which can effectively consider the effects of the mean, dispersion and probability distribution of the duration on seismic demands of bridge structures and can significantly improve the precision of analytical results and computation efficiency.

关键词

桥梁抗震 / 基于性能的桥梁抗震设计 / 实际地震波 / 持时 / 优化选择方法

Key words

Earthquake resistance of bridge / Performance-based seismic design / Real earthquake ground motion / Duration / Optimal selection method

引用本文

导出引用
陈亮;任伟新;张广锋;左小晗;黄勇. 基于性能的桥梁抗震设计中考虑持时的实际地震波优化选择方法[J]. 振动与冲击, 2015, 34(3): 35-42
CHEN Liang REN Wei-xin ZHANG Guang-feng ZUO Xiao-han HUANG Yong. An Optimal Method for Selecting Real Earthquake Ground Motions Considering Duration for Performance-Based Seismic Design of Bridges[J]. Journal of Vibration and Shock, 2015, 34(3): 35-42

PDF(1901 KB)

Accesses

Citation

Detail

段落导航
相关文章

/