爆炸荷载下K8型单层球面网壳的数值模拟

王永辉, 翟希梅, 支旭东, 范峰

哈尔滨工业大学土木工程学院



摘要:

为了解大跨度空间结构在爆炸荷载下的响应特征,用ANSYS/LS-DYNA动力有限元软件,建立40 m跨度K8型单层球面网壳在爆炸荷载作用下的有限元分析模型.在材料参数设置、材料本构关系选择、网格尺寸选择与划分方式、结构对称性的应用方面首先进行对比分析,并将爆炸冲击波峰值超压的模拟值与经验公式值进行对比,验证数值模拟的适用性.分析不同爆炸荷载及炸药距离下的K8型单层球面网壳的内力和变形,并总结了中心爆炸荷载作用下网壳结构的失效模型:结构无损伤、结构轻度损伤、结构中度破坏Ⅰ、结构中度破坏Ⅱ和结构严重破坏,给出炸药当量与炸点距离对结构动力响应的影响程度与规律.

关键词:  网壳  爆炸  动力响应  数值模拟  失效模式  建模

DOI：10.11918/j.issn.0367-6234.2011.04.003

分类号:

基金项目:国家自然科学基金资助项目(50978077)



Numerical simulation of Kiewitt8 single-layer reticulated shell subjected to blast loading

WANG Yong-hui, ZHAI Xi-mei, ZHI Xu-dong, FAN Feng

School of Civil Engineering,Harbin Institute of Technology,150001 Harbin,China

Abstract:

To know the response characteristic of long-span spatial structure subjected to blast loading,finite element software ANSYS/LS-DYNA was used to set up the analytical model of Kiewitt8 single-layer reticulated shell with span of 40 m.The selection and determination of material parameter and constitutive model,element type,mesh dimension and generation and application of symmetric structure for saving computer burden were analyzed.The simulative and experiential values from several references about the peak overpressure of blast wave were compared,and the results verified the creditability and applicability of numerical simulation.Based on the finite element analysis of Kiewitt8 single-layer reticulated shell with varied TNT blast loading and standoff distance,the internal force and deformation for shell members were obtained;The failure characteristics and types of reticulated shell subjected to central explosive blast loading were summarized: no damage,mild impairment,moderate destruction Ⅰ,moderate destruction Ⅱ and severe destruction;And the effects of TNT equivalent weight and standoff distance on the structural dynamical response degree and rule were investigated.

Key words:  reticulated shell  blast  dynamic response  numerical simulation  failure type  modelling