张成明, 钟紫蓝, 甄立斌, 申轶尧, 赵密. 适用于圆形隧道损伤评价的地震动强度指标研究[J]. 工程力学, 2021, 38(1): 100-108. DOI: 10.6052/j.issn.1000-4750.2020.02.0085
引用本文: 张成明, 钟紫蓝, 甄立斌, 申轶尧, 赵密. 适用于圆形隧道损伤评价的地震动强度指标研究[J]. 工程力学, 2021, 38(1): 100-108. DOI: 10.6052/j.issn.1000-4750.2020.02.0085
ZHANG Cheng-ming, ZHONG Zi-lan, ZHEN Li-bin, SHEN Yi-yao, ZHAO Mi. SEISMIC INTENSITY MEASURES FOR THE DAMAGE EVALUATION OF CIRCULAR TUNNELS[J]. Engineering Mechanics, 2021, 38(1): 100-108. DOI: 10.6052/j.issn.1000-4750.2020.02.0085
Citation: ZHANG Cheng-ming, ZHONG Zi-lan, ZHEN Li-bin, SHEN Yi-yao, ZHAO Mi. SEISMIC INTENSITY MEASURES FOR THE DAMAGE EVALUATION OF CIRCULAR TUNNELS[J]. Engineering Mechanics, 2021, 38(1): 100-108. DOI: 10.6052/j.issn.1000-4750.2020.02.0085

适用于圆形隧道损伤评价的地震动强度指标研究

SEISMIC INTENSITY MEASURES FOR THE DAMAGE EVALUATION OF CIRCULAR TUNNELS

  • 摘要: 地震动强度指标是影响结构地震风险评估准确性的重要参数,在基于性能的地震工程研究框架中发挥着重要作用。合理的地震动强度指标可以使结构地震反应预测结果更加准确。为研究适用于圆形隧道损伤评价的地震动强度指标,该文基于整体式非线性动力时程分析方法,建立圆形隧道-围岩相互作用二维有限元分析模型,采用FEMA-P695推荐的近场无脉冲及远场地震动作为输入,并以衬砌横断面整体压缩损伤指数和拉伸损伤指数作为结构损伤指标评估衬砌损伤状态,对比分析了工程中常用的20种地震动强度指标在圆形隧道损伤评价中的适用性。研究结果表明:基于有效性、实用性、有益性和充分性判别准则,适用于圆形隧道损伤评价的最优地震动强度指标为持续最大加速度SMA,其次为加速度谱强度ASI。

     

    Abstract: The seismic intensity measure (IM) is a key parameter affecting the accuracy of seismic risk assessment, which plays an important role in the performance-based earthquake engineering framework. A reasonable IM can make the prediction of structural seismic responses more accurate. To study on seismic IMs which are suitable for the damage evaluation of circular tunnels, a two-dimensional finite element model was established for the nonlinear dynamic time history analyses of circular tunnel-surrounding rock interaction. The near-field ground motions without velocity pulses and far-field ground motions recommended by FEMA-P695 were used as the input in the numerical model. The overall lining damage indices in compression and in tension were used as the engineering damage measures to estimate the damage states of the lining. The applicability of 20 ground motion IMs commonly used in the engineering practice were investigated. The results show that based on the criteria of efficiency, practicality, proficiency and sufficiency, the best seismic IM for the damage evaluation of circular tunnels is the sustained maximum acceleration (SMA), and the second best is the acceleration spectrum intensity (ASI).

     

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