基于向量式有限元法的某开合屋盖结构关键拉杆失效分析(英文)

Analysis of a retractable roof subjected to critical member failure using VFIFE method

绍兴县体育中心体育场开合屋盖结构由固定屋盖和活动屋盖组成,活动屋盖可以在固定屋盖的轨道上滑动.根据建筑需求,固定屋盖的主桁架设计为扁拱状.为克服扁拱结构效率较低的缺点,主桁架下部安装了一系列实心拉杆形成弓形的结构.显然,拉杆是屋盖结构的关键受力构件,它的失效对整个屋盖结构的力学性能有很大影响.向量式有限元(VFIFE)是一种新型的结构分析数值方法,特别适用于处理动力和大变形问题.本文采用向量式有限元法对屋盖结构闭合和开启状态下关键拉杆的突然失效进行了分析,追踪了关键位置的位移、构件内力以及支座反力的动力响应过程.结果表明,对于单拉杆设计方式,开合屋盖在拉杆失效后呈现很强的动力响应;实际结构设计采用的并行多杆形式能有效减少拉杆失效产生的屋盖结构动力响应.

The Stadium of Shaoxing Sports Center features a retractable roof comprising a movable roof and a fixed roof. The former is able to slide over the rails mounted on top of the latter. The main trusses of the fixed roof are in the shape of a flat arch due to architectural demands, dictating low structural efficiency. To overcome this deficiency, the main trusses are equipped with massive rods in the bottom to form a bow-like structure. These rods are the critical members of the roof structure and their failure is crucial to the overall structural performance. This paper investigates the dynamic response of the roof structure subjected to sudden failure of the critical rod both in its extended and retracted positions using the vector form intrinsic finite element （VFIFE） method which is an emerging numerical method particularly effective for dynamic and large deformation analysis. The numerical results indicate that the sudden failure of the critical rod results in a significant dynamic response of the roof structure with the single-rod design. However, the dynamic response can be effectively reduced with the multi-rod design, which is the case adopted in the design of the roof structure.