基于能量格式的模态Pushover方法及其应用

邹中权;贺国京

振动与冲击 ›› 2010, Vol. 29 ›› Issue (12) : 216-220.

PDF(1303 KB)
PDF(1303 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (12) : 216-220.
论文

基于能量格式的模态Pushover方法及其应用

  • 邹中权 1; 贺国京 2
作者信息 +

ENERGY-BASED FORMATION OF MODAL PUSHOVER METHODAND ITS APPLICTION

  • ZOU Zhong-quan1 ; HE Guo-jing2
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文章历史 +

摘要

提出了一种基于能量增量直接获得模态Pushover分析中能力谱曲线的改进方法。基于线性和非线性系统的能量平衡方程证明,模态荷载作用下结构的总输入能量全部转化为某阶单自由度系统的总能量,并推导了增量模态荷载作用下系统能量增量与谱位移增量及谱加速度增量之间的关系,据此直接获得能力谱曲线。根据能力谱曲线得到各阶等效单自由度系统特性,结合弹塑性反应谱计算结构地震响应。运用该方法对一座高墩大跨连续刚构桥进行分析,并与常规Pushover方法进行对比。结果表明,本文方法得到的能力谱曲线稳定性好,避免了常规模态Pushover方法中能力谱曲线的多义性和扭曲问题。

Abstract

An improved method that directly establishes the capacity curve based on energy increments is submitted for modal pushover analysis (MPA). Applying the energy-balance equation of linear and nolinear system, it is proved that while the structure is loaded with modal related load, the total input energy is fully transformed to the absorbed energy by the corresponding SDOF system. The relationship between the energy increments and the spectral displacement increments as well as the spectral acceleration increments are deduced, hence the capacity curve is directly obtained. The properties of the equivalent SDOF system are evaluated from the capacity curve, and the seismic responses are calculated with the capacity curve and response spectrum. A large span continuous frame bridge with tall piers in seismic zone is analyzed with the submitted method. The results show that the capacity curves obtained with the proposed method are more stable than those obtained with conventional method, thus the deficiency of multi-definition or distortion for conventtional method is corrected.

关键词

抗震分析 / 模态pushover方法 / 能量方法 / 能力谱 / 连续刚构桥

Key words

anti-seismic analysis / modal pushover analysis / energy-based method / capacity spectrum / continuous rigid frame bridge

引用本文

导出引用
邹中权;贺国京 . 基于能量格式的模态Pushover方法及其应用[J]. 振动与冲击, 2010, 29(12): 216-220
ZOU Zhong-quan;HE Guo-jing. ENERGY-BASED FORMATION OF MODAL PUSHOVER METHODAND ITS APPLICTION[J]. Journal of Vibration and Shock, 2010, 29(12): 216-220

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