爆炸荷载作用下单层柱面网壳的动力响应

Dynamic response of single-layer cylindrical reticulated shells subjected to blast loading

以单层柱面网壳为研究对象,分析内部中心爆炸荷载作用下结构的动力响应.利用显式动力分析程序ANSYS/LS-DYNA对跨度为30m×45m的单层柱面网壳在不同炸药当量时上部网壳的节点竖向位移和杆件塑性发展进行分析,得出3种不同的损伤模式:轻微塑性损伤、严重塑性损伤和泄爆塑性损伤.改变屋面板厚度和檩托小立柱截面面积,发现屋面板适当变薄时,檩托小立柱截面积越小时可以减轻整体结构的破坏.

Taking the single-layer cylindrical reticulated shell as the research object,the dynamic response of the structure under internal center explosive loading is analyzed.Using the explicit dynamic analysis program ANSYS/LS-DYNA,the vertical displacement of the nodes of the upper reticulated shell and the plastic development of the rods were analyzed for a single-layer cylindrical reticulated shell with a span of 30 m×45 m at different explosive equivalents.Three different damage patterns are presented:minor plastic damage,severe plastic damage and explosion-venting plastic damage.The thickness of the roof panel and the cross-sectional area of the small column are changed to obtain a thinner roof.When the cross-sectional area of the small column gets smaller,the damage of the entire structure can be reduced.