软土地区典型民防工程结构地震易损性分析

程屹歆; 张冬梅; 黄忠凯; 张吾渝; 王寿生

doi:10.3973/j.issn.2096-4498.2024.07.007

隧道建设 >

2024 , Vol. 44 >Issue 7: 1397 - 1409

DOI: https://doi.org/10.3973/j.issn.2096-4498.2024.07.007

研究与探索

软土地区典型民防工程结构地震易损性分析

程屹歆 ,
张冬梅 ,
黄忠凯 ,
张吾渝 ,
王寿生

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(1. 同济大学地下建筑与工程系，上海 200092； 2. 青海大学土木水利学院，青海西宁 810016； 3. 上海市政工程设计研究总院(集团)有限公司，上海 200092)

程屹歆（2000—），男，湖南株洲人，同济大学土木水利专业在读硕士，研究方向为地下结构抗震分析。E-mail： 15216859919@163.com。*通信作者：张冬梅， E-mail： dmzhang@tongji.edu.cn。

网络出版日期: 2024-08-05

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Seismic Fragility Assessment of Typical Civil Defense Engineering Structures in Soft Soils

CHENG Yixin ,
ZHANG Dongmei ,
HUANG Zhongkai ,
ZHANG Wuyu ,
WANG Shousheng

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(1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. College of Civil Engineering and Water Resources, Qinghai University, Xining 810016, Qinghai, China; 3. Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China)

Online published: 2024-08-05

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摘要

为揭示软土地区典型民防工程结构地震易损性变化规律，以某单建式民防工程为例，首先，基于ABAQUS有限元平台建立土体-民防工程结构系统非线性动力分析模型；其次，进一步考虑土体非线性特性和输入地震动的不确定性，通过数值模拟揭示民防工程结构易损性分析的合适地震动强度指标(IM)；最终，建立软土地区典型民防工程结构地震易损性曲线。研究结果表明： 1）峰值地面加速度(PGA）相较于其他地震动强度指标，其有效性和实用性较高，适合用于民防工程结构地震易损性分析； 2）土层条件对民防工程结构的地震易损性有明显影响，土层越软，结构的易损性越高； 3）软土地区民防工程结构在地震作用下有可能遭受严重破坏，随着地震动强度的增加，每种破坏状态的超越概率逐渐增加并接近 100%。

关键词： 民防工程; 软土地区; 地震易损性分析; 地震动强度指标

本文引用格式

程屹歆 , 张冬梅 , 黄忠凯 , 张吾渝 , 王寿生 . 软土地区典型民防工程结构地震易损性分析[J]. 隧道建设, 2024 , 44(7) : 1397 -1409 . DOI: 10.3973/j.issn.2096-4498.2024.07.007

Abstract

The authors investigate the seismic fragility of typical civil defense engineering structures built in soft soils. A nonlinear dynamic analysis model of the soil-civil defense engineering structure system is developed using the ABAQUS finite element platform. Numerical simulations are conducted to determine the most appropriate intensity measure for seismic fragility analysis, taking into account the nonlinear characteristics of the soil and the uncertainty of input ground motion. Subsequently, seismic fragility curves for typical civil defense engineering structures in soft soils are established. The findings indicate that: (1) Peak ground acceleration is the most effective and practical intensity measure for the seismic fragility analysis of civil defense engineering structures. (2) The seismic fragility of these structures increases with softer soil conditions. (3) Civil defense engineering structures in soft soils are highly likely to suffer extensive damage during earthquakes, with the exceedance probability for each damage state approaching 100% as seismic intensity increases.

Key words： civil defense engineering; soft soils; seismic fragility analysis; intensity measure

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