含能材料2025，Vol.33Issue(7)：725-737,13.DOI:10.11943/CJEM2025084
局部爆炸荷载作用下浅埋防护工事支撑结构层的动力分析方法
Dynamic Analysis Method for Supporting Structural Layers in Shallow-Buried Fortifications under Localized Blast Loads
摘要
Abstract
To address the issue of highly localized blast loads caused by limited distribution layers in shallow-buried layered forti-fications,an equivalent single-degree-of-freedom(SDOF)dynamic analysis method considering the characteristics of localized loads was proposed.This method was used for evaluating the response of the roof slab of supporting structural layers.Based on the selected mode shape functions and the energy equivalence principle,dynamic coefficient calculation methods for both elas-tic and plastic response stages of the structure were established.The validity of the method was verified through finite element simulations.Results indicate that the static deflection curve under uniformly distributed loads can still serve as the mode shape function under localized loads,with acceptable deviations.If localized loads are simplified to uniformly distributed loads for de-sign purposes based on equal impulse principle,the maximum displacement of the structure may be significantly underestimat-ed,with errors potentially reaching up to 9.7 times.In the plastic response stage of the structure,the dynamic coefficient of struc-tural resistance is negatively correlated with the degree of plastic deformation.The product of the total load duration and the structure's natural frequency significantly influences the structural response:when this value is less than or equal to 1,the re-sponse is impulse-dominated;when it approaches 10,moderately extending the pressurization time favours structural resistance to blast loads;when the product exceeds 50,the beneficial effect of extending the pressurization tends to saturate.This method effectively characterizes the dynamic response characteristics of supporting structure layers in shallow-buried fortifications under localized blast loads,providing a theoretical support for the blast-resistant design of related protective structures.关键词
抗爆结构/成层式/支撑结构层/局部荷载/动力系数/抗爆设计Key words
blast-resistant structure/layered configuration/supporting structural layer/localized load/dynamic coefficient/blast-resistant design分类
军事科技引用本文复制引用
陈力,刘思嘉..局部爆炸荷载作用下浅埋防护工事支撑结构层的动力分析方法[J].含能材料,2025,33(7):725-737,13.基金项目
国家自然科学基金(52378487,52378488) National Natural Science Foundation of China(Nos:52378487,52378488) （52378487,52378488）
