基于Hoff理论的金属复合屋面板夹层壳单元

Hoff theory-based sandwich shell element for metal composite roof panel

针对大跨度建筑屋盖结构常用的聚氨酯泡沫夹芯金属复合屋面板,根据修正后的Hoff型夹层板理论,建立简便、有效的八结点矩形夹层壳单元.以一块矩形屋面板为例,分别采用分层实体单元、夹层体单元和八结点矩形夹层壳单元模拟.数值结果显示,八结点矩形夹层壳单元模拟的屋面板在静荷载作用下的变形形式与精细的分层实体单元模型相同,且两者变形基本接近;基本振型与精细的分层实体单元模型相同,自振频率较接近.表明采用该夹层壳单元能够有效地模拟聚氨酯夹芯金属复合屋面板的静、动力特性.

Metal composite roof panel with polyurethane foam core is often used as the roof covering of large-span structures.A simple and effective eight-node rectangular sandwich shell element was established for the polyurethane foam sandwich panel based on the amended theory of the Hoff-type sandwich panel.A rectangular roof panel was employed as an example.Layered solid elements,sandwich solid element and eight-node rectangular sandwich shell element were respectively used to simulate the roof panel.Results reveal that the deformation form of the eight-node rectangular element model is the same as the accurate layered solid element model,and their deformation values are similar.The basic vibration modes are as same as accurate layered solid element model,and vibration frequency is approximated.Results indicate that the sandwich shell element can effectively simulate the static and dynamic characteristic of polyurethane sandwich composite metal roof.