蕲春三馆屋面悬挑结构方案选型及实践

Discussion and application on structural scheme selection of cantilevered roof for Qichun Three Museums

大悬挑屋盖对竖向荷载、竖向地震及风荷载反应敏感,过大的挠度变形会影响结构的正常使用。以蕲春三馆为工程背景,从结构的内力分布和变形的角度出发,通过有限元软件对其大悬挑屋盖体系进行了多种结构方案的研究,并对模拟结果进行了对比分析,与实测数据进行相互验证。结果表明,多榀预应力混凝土桁架通过调整桁架的预应力,能很好地控制和改善悬挑过大可能造成的结构受力和变形问题,其结构方案和设计方法可供同类项目参考。

Due to the sensibility of the large cantilevered roof to the structural weight,vertical earthquake action and wind load,excessive deflection will affect the normal service of the structure.Taking Qichun Three Museums as engineering background,a variety of structural schemes for the large suspended roof system were studied by finite element software.Comparative analyses were made between the simulation results and measured data.Results demonstrate that multiple prestressed concrete truss by adjusting the prestressing force of truss can efficiently control and improve structural stress and deformation caused by oversized cantilevered structure,which could be referenced to by similar projects about structural scheme and design method.