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概率地震需求分析(probabilistic seismic demand analysis,PSDA)理论在桥梁抗震设计中具有重要应用，地震动强度指标(intensity measure,IM)作为PSDA的核心参数，其选择直接影响结构的抗震性能评估。本文针对隔震桥梁，研究了不同类型地震动(远断层与脉冲近断层地震)下不同IM的表现。通过建立某四跨隔震连续梁桥的有限元模型，并选取96条地震记录，对比14种常见IM的效率、实用性、熟练度和充分性等方面的表现。研究结果表明，基于反应谱几何均值构建的IM(Sagm2)在评估隔震桥梁的抗震性能时具有明显优势，尤其在效率和实用性方面表现突出。此外，本文进一步探讨了反应谱类型和周期范围对IM选择的影响。通过优化周期范围，提出Sagm3作为最优IM，其周期范围为0.2T1～3T1，能够在远断层和近断层地震动作用下提供较为准确的结构响应预测。本研究为隔震桥梁的抗震设计提供了科学依据，并提出了IM选择的优化方案。
Abstract：Probabilistic seismic demand analysis(PSDA) theory has an important application in the seismic design of bridges. Ground motion intensity measure(IM) is the core parameter of PSDA,and its selection directly affects the seismic performance evaluation of structures. In this paper,the IM behavior of isolated bridges under different types of ground motion(far fault and pulse near fault earthquake) is studied. The finite element model of a four-span isolated continuous beam bridge was established,and 96 seismic records were selected to compare the efficiency,practicability,proficiency and adequacy of 14 common IM. The results show that IM(Sagm2) based on geometric mean response spectrum has obvious advantages in evaluating the seismic performance of isolated bridges, especially in terms of efficiency and practicability. In addition,the effects of reaction spectrum type and period range on IM selection were further discussed. By optimizing the period range,Sagm3 is proposed as the optimal IM with a period range of 0.2T1 to 3.0T1,which can provide more accurate prediction of structural response under the action of ground motion on far and near faults. Finally,the research provides a scientific basis for the seismic design of isolated bridges,and puts forward the optimization scheme of IM selection.
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基本信息:
DOI：10.13774/j.cnki.kjtb.2025.08.013
中图分类号:U442.55;U448.215
引用信息:
[1]徐天庭,宁晓骏,刘国坤.隔震连续梁桥时程动力分析中地震动强度指标评价[J].科技通报,2025,41(08):87-94+112.DOI:10.13774/j.cnki.kjtb.2025.08.013.
基金信息: