基于非线性弹簧约束作用的矩形单跨地下结构抗震性能简化分析研究  

Simplified analysis of seismic performance of rectangular single-span underground structures based on the restraint effect of nonlinear spring

作　　者：刘洪涛 胡炳麟 韩润波 许成顺[3] 杜修力[3] LIU Hongtao;HU Binglin;HAN Runbo;XU Chengshun;DU Xiuli(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;School of Resources,Environment and Architectural Engineering,Chifeng University,Chifeng 024000,China;Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]赤峰学院资源环境与建筑工程学院,内蒙古赤峰024000 [3]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《地震工程与工程振动》2025年第2期14-21,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52478488);内蒙古自治区自然科学基金项目(2023QN05012)。

摘　　要：为了弥补考虑土-结构相互作用的地下结构体系静力推覆试验方法耗资、耗时、试验现象不易观察等缺点,结合地下结构反应位移法基本原理,基于弹性弹簧仅代表加载过程某一特殊时刻的状态,无法表述土体在加载过程中的状态变化对结构的影响,提出了基于非线性弹簧代替周围约束土体的地下结构抗震性能静力推覆分析方法。以某单跨地下结构为例,开展土-地下结构模型的Pushover分析,基于非线性弹簧-地下结构体系,分析了轴压比、弹簧与结构间的相互作用关系对结构受力性能的影响。对比分析关键断面弯矩能力曲线,结果表明弹簧-地下结构体系静力推覆模型可应用于地下结构抗震研究中,在层间位移角达到1/200前,线性弹簧模型与非线性弹簧模型均有较高的精度,层间位移角超过1/200后,非线性弹簧模型的精度明显高于线性弹簧模型。非线性弹簧-地下结构体系抗震性能简化分析方法为研究地下结构复杂的受力特性提供参考。This paper proposes a nonlinear spring restraint structure to overcome the limitations of the static thrust test method in evaluating underground structure systems.Considering the difficulties of soil-structure interaction,high costs,and limited observability of test phenomena,the proposed approach integrates basic principle of the reaction displacement method for underground structures.It recognizes that the traditional elastic spring fails to capture soil state changes during loading,thus prompting the introduction of a more dynamic spring-structure system.It suggests using nonlinear springs instead of soils for analyzing seismic performance.Through Pushover analysis on a single-span underground structure model,the influence of factors such as the axial compression ratio and spring-structure interaction on mechanical performance is investigated.Comparing bending moment capacity curves of key sections shows that the static thrust overlay model for spring-underground structures is suitable for seismic analysis of underground structures.Up to an inter-story displacement angle of 1/200,both the linear and nonlinear spring models are highly accurate,but beyond this threshold,the nonlinear spring model is significantly superior.The simplified analysis method for seismic performance of nonlinear spring-underground structure systems provides insights into the complex force behaviors of underground structures.

关 键 词：地下结构 PUSHOVER分析方法 弹簧-地下结构体系 土-结构相互作用 抗震性能 

分 类 号：TU354[建筑科学—结构工程] P315.92[天文地球—地震学]