远距离爆炸荷载作用下钢框架几何相似律研究  

Study on geometric similarity law of steel frame under a far-field explosion load

作　　者：陈能翔 钟巍[2,3] 王澍霏 杨尚霖 田宙[2] 欧翔 黄怀纬[1] 姚小虎[1] CHEN Nengxiang;ZHONG Wei;WANG Shufei;YANG Shanglin;TIAN Zhou;OU Xiang;HUANG Huaiwei;YAO Xiaohu(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,Guangdong,China;Northwest Institute of Nuclear Technology,Xi’an 710024,Shaanxi,China;School of Mathematical Sciences,Peking University,Beijing 100871,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]西北核技术研究所,陕西西安710024 [3]北京大学数学科学学院,北京100871

出　　处：《爆炸与冲击》2023年第1期59-70,共12页Explosion and Shock Waves

基　　金：国家杰出青年科学基金(11925203)。

摘　　要：根据Π定理推导了远距离爆炸荷载作用下钢框架原型结构与缩比模型的几何相似律表达式。基于已有的钢框架子结构爆炸实验,采用AUTODYN建立了钢框架子结构数值模型,验证了流固耦合方法在结构爆炸响应分析中的可靠性。在此基础上,对比了流固耦合方法和解析爆炸边界方法在钢框架远距离爆炸数值模拟中的准确性和计算效率,结果表明,解析爆炸边界方法可以合理地模拟远距离爆炸荷载作用下钢框架的动态响应,且计算效率较高。最后,采用该方法分析了具有不同相似比的两层三跨钢框架结构在远距离爆炸荷载作用下的动态响应及毁伤效应,结果表明:该结构的动态响应和毁伤效应符合几何相似规律。According to theΠprinciple,a similarity law was proposed between the prototype and the scaled-down models of the steel frame under a far-field explosion load.Based on the explosion experiments of steel frame substructures,a numerical model of the substructure was established by AUTODYN to verify the reliability,accuracy,and computational efficiency of the fluid-structure interaction method in the structural explosion response analysis and the analytical blast boundary method by comparing the numerical simulation results with the experiments of the steel frame under the far-field explosion load.The results show that the analytical blast boundary method can reasonably simulate the dynamic response of the steel frame under far-field explosion loads with high computational efficiency.Finally,the dynamic response and damage of a two-story threespan steel frame structure under a far-field explosion load were analyzed by the analytical blast boundary method using different scaling ratios.The results show that when the two-story three-span steel frame is fully scaled according to the geometric similarity ratio,the dynamic displacement responses of the prototype and the scaled-down models of the steel frame under the far-field explosion load are similar.And the damage effects of the prototype and the scaled-down models based on the assessment index of interlayer displacement angle are similar.

关 键 词：相似律 钢框架 远距离爆炸 动态响应 

分 类 号：O382.4[理学—流体力学]