高轩能++付诗琪

摘要：

基于修正后的JohnsonCook材料模型，应用ANSYS/LSDYNA建立K8型单层球面网壳计算模型，对内爆炸下不同空间高度的结构爆炸响应进行计算和分析。首先，分析结构内爆炸冲击波传播规律，验证模型参数选取的可行性；其次，讨论内爆炸作用下球面网壳的动力响应，对比分析不同本构模型对爆炸响应的影响；最后，定义下部支承结构所围体积占结构所围总体积的比值为空间高度系数，讨论空间高度系数对墙面未开洞和墙面开洞球面网壳動力响应的影响。结果表明，爆炸冲击波在球面网壳结构角部有汇聚效应，与反射冲击波共同作用，严重影响球面网壳结构的动力响应；对于墙面未开洞的球面网壳，爆炸响应受反射冲击波影响较大；对于墙面开洞的球面网壳，爆炸响应受空间高度系数影响较大。基于研究结果给出了球面网壳结构在内爆炸下防爆和抗爆设计的合理空间高度系数建议值。

关键词：

球面网壳；内爆炸；空间高度；动力响应；冲击荷载

Abstract：

Based on the modified JohnsonCook material model， ANSYS / LSDYNA was used to establish the model of K8 singlelayer spherical reticulated shell， and the structural explosion responses were calculated and analyzed with different space heights. Firstly， the propagation law of the shock waves inside the structure was analyzed，and the feasibility of parameters selection was verified. Secondly， the dynamic responses of the spherical reticulated shell under the internal explosion were discussed， and the influence of different constitutive models on the explosion responses was comparative analyzed. Finally， the ratio of the volume enclosed by lower supporting structure to the total volume surrounded by the whole structure was defined as a space height coefficient. The influence of the space height coefficient on the dynamic responses of spherical latticed shell （with or without holes on wall） was studied and discussed. The results show that the shock waves have a converging effect at the corner of the spherical shell structure， combined with the reflected shock waves， which may seriously affect the dynamic responses of the spherical shell. For the spherical shell with wall no openings， the explosion responses were greatly affected by the reflected shock wave， and for the spherical shell with wall openings， the explosion responses were greatly affected by the space height coefficient. Based on the research results， the reasonable space height coefficient of explosionresistant design on spherical shell structure under internal explosion was proposed.

Keywords：

spherical reticulated shell； internal explosion； space height； dynamic response； impact load

单层球面网壳结构是一种典型的空间结构，多用于地标性建筑。此类建筑通常人员密集，一旦受到爆炸袭击，将造成极为恶劣的社会影响，故研究大空间结构在内爆炸作用下的动力响应，对于结构抗爆设计具有重要的工程价值[1]。

爆炸冲击荷载是典型的动力荷载，具有作用时间短、峰值大的特点，建筑结构在爆炸冲击荷载作用下的结构响应十分复杂。高轩能等[25]建立钢网壳结构数值计算模型，运用POD法分解钢网壳内表面的冲击波超压，解决了冲击波荷载的时空差异性，进而对单层球面钢网壳在内爆炸作用下的动力响应进行了数值模拟计算，探索了不同参数变化对结构动力响应的影响。……