标志牌杆在风载作用下的有限元分析

Finite Element Analysis on Signboard Structure under Wind Load

某市政改造工程中计划在现有的公路L型标志牌杆上更换新型标志牌。据此计算分析旧L型标志牌杆是否可以在承载新型标志牌条件下继续使用,以达到降低改造成本的目的。针对改造工程中需要替换标志牌的旧L型标志牌杆,建立了包括面板、悬臂和立柱的几何模型。使用有限元方法进行分析计算了结构的模态、得到了自振频率。计算了结构在自重以及风荷载作用两种工况下的位移、应力响应,并结合规范要求,判别出标志牌杆结构整体的刚度不满足规范要求。因此旧L型标志牌杆必须被替换,同时提出了结构优化意见。

Aim at old L-type signboard structure which may need to be replaced in the reconstruction engineering,a finite element model containing panels,cantilever and pillar are built.The modal of structure is analyzed and natural frequency is obtained.Response on displacement and stress of the structure is calculated under the gravity and wind load.Combined with the technical code,the safety for structure to continue to use is confirmed.