汶川地震动衰减特性及其大跨高墩连续刚构桥的地震响应规律

发布时间：2018-04-23 10:16

本文选题：大跨高墩连续刚构桥 + 汶川地震　；参考：《土木工程学报》2017年04期

【摘要】：为分析不同断层距下,汶川地震动对大跨高墩连续刚构桥的作用效应演变规律,收集了全国129个汶川主震地震台站记录。从工程地震学角度,分析了汶川地震动记录强度指标的衰减特性,总结了PGA、PGV和反应谱的衰减规律。以庙子坪大桥主桥为工程背景,构建了两类不同墩高形式的大跨连续刚构桥梁样本组,对两类桥梁自振周期的代表值进行了对比讨论和分析;基于反应谱分析,拟合得到两类桥梁响应谱随断层距变化的峰值响应曲面,讨论了不同断层距,大跨高墩连续刚构桥的响应特点。研究表明,不同断层距的大跨高墩连续刚构桥梁的地震响应具有明显差异,近断层地震响应明显强烈。研究成果可为大跨高墩连续刚构桥的桥墩布置形式和桥址选择提供借鉴和参考。
[Abstract]:In order to analyze the effect of Wenchuan ground motion on continuous rigid frame bridge with large span and high pier under different fault spacing, 129 records of Wenchuan earthquake stations were collected. From the point of view of engineering seismology, the attenuation characteristics of Wenchuan earthquake recording intensity index are analyzed, and the attenuation law of PGA PGV and response spectrum is summarized. Taking the main bridge of Miaoziping Bridge as the engineering background, two types of long-span continuous rigid frame bridges with different piers are constructed, and the representative values of the natural vibration periods of the two kinds of bridges are compared and analyzed. The peak response surface of two kinds of bridge response spectrum varying with fault distance is obtained. The response characteristics of continuous rigid frame bridge with different fault spacing and long span and high pier are discussed. The results show that the seismic responses of long-span and high-pier continuous rigid frame bridges with different fault distances are obviously different, and the seismic responses of near-fault layers are obviously strong. The research results can be used for reference and reference for the layout of piers and site selection of long-span and high-pier continuous rigid frame bridges.
【作者单位】：西南交通大学;
【基金】：国家重点基础研究发展计划(2013CB036300-2) 国家重点研发计划(2016YFC0802202) 国家自然科学基金(51678489) 四川省科技计划项目(2016JY0130)
【分类号】：U442.55;U448.23

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