基于改进Park-Ang模型的RC桥墩地震动损伤及滞回耗能特性研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (5) : 97-105.

论文

基于改进Park-Ang模型的RC桥墩地震动损伤及滞回耗能特性研究

江辉1，慎丹2，刘夏润1，杨庆山1，朱晞1

作者信息 +

Seismic damage and hysteretic energy characteristics research of rc bridge pier based on improved park-ang model

Jiang Hui1, Shen-dan2, Liu Xia-run1, Yang Qing-shan1, Zhu Xi1

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文章历史 +

摘要

桥梁结构尤其是桥墩在强震作用下的地震动损伤、滞回耗能及其分布，是基于性能抗震设计的重要基础。引入改进的Park-Ang双参数损伤评估模型，以某靠近活动断层的高速公路RC梁式桥等效单墩模型为对象，深入分析了加速度峰值(PGA)、频谱、持时等三个地震动要素对损伤、滞回耗能及其分布的影响规律。研究表明，损伤及累积滞回耗能沿桥墩竖向自下而上显著减小，随着PGA的增大，墩底及附近截面的损伤指标明显增大，损伤高度不断扩大，损伤参与系数分布基本稳定，墩底损伤一般占桥墩总损伤的30%～40%。累积滞回耗能所致损伤可达总损伤的20%至80%，不容忽略。地震动频谱特性影响显著，当地震波卓越周期与结构自振周期接近时，会导致各项指标的显著增加。持时对损伤分布比例没有明显影响，但强震持时对于截面损伤值存在累加效应。

Abstract

The distribution characteristics of seismic damage and hysteretic energy for bridge structure especially bridge pier under strong earthquake is an important basis of performance-based seismic design. In this paper, the improved two-parameter Park-Ang damage assessment model was introduced, and an equivalent pier model from a RC highway bridge near active fault was studied. The influence of peak acceleration(PGA), frequency and duration on the distribution of seismic damage and hysteretic energy was discussed in-depth. Studies show that damage and cumulative hysteretic energy declines significantly along the piers upwards. With the increase of PGA, damage of the cross section near the pier bottom enlarges apparently, and the damage height expands at the same time. The distribution of damage participation factor is stable, and the damage proportion for the bottom segment to the whole pier is 30%-40%. The seismic damage from cumulative hysteretic energy is 20%-80% of the total damage, which should not be ignored. The frequency characteristics of ground motion has significant influence, when its predominant period is close to the bridge’s natural period, each indicator increases saliently. Duration has no significant impact on the distribution proportion of damage, but strong earthquake duration exerts cumulative effect on the damage value of each cross section.

导出引用

江辉;慎丹;刘夏润;杨庆山;朱晞. 基于改进Park-Ang模型的RC桥墩地震动损伤及滞回耗能特性研究[J]. 振动与冲击, 2012, 31(5): 97-105

Jiang Hui;Shen-dan;Liu Xia-run;Yang Qing-shan;Zhu Xi. Seismic damage and hysteretic energy characteristics research of rc bridge pier based on improved park-ang model[J]. Journal of Vibration and Shock, 2012, 31(5): 97-105