软土地区典型民防工程结构地震易损性分析
Seismic Fragility Assessment of Typical Civil Defense Engineering Structures in Soft Soils
程屹歆 1张冬梅 2黄忠凯 1张吾渝 3王寿生4
作者信息
- 1. 同济大学地下建筑与工程系,上海 200092
- 2. 同济大学地下建筑与工程系,上海 200092;青海大学土木水利学院,青海 西宁 810016
- 3. 青海大学土木水利学院,青海 西宁 810016
- 4. 上海市政工程设计研究总院(集团)有限公司,上海 200092
- 折叠
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%.
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.
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Key words
civil defense engineering/soft soils/seismic fragility analysis/intensity measure引用本文复制引用
基金项目
国家重点研发计划课题(2022YFC3800905)
国家自然科学基金(52108381)
国家自然科学基金(52090082)
国家自然科学基金(52238010)
同济大学学科交叉联合攻关项目(2022-3-ZD-07)
青海省科学技术厅基础研究计划项目(2023-ZJ-926M)
出版年
2024
NETL
NSTL
万方数据