某钢桁架屋盖结构分析与设计

Structural Analysis and Design of a Steel Truss Roof

为了满足建筑净空要求,屋面与桁架下弦相连,处于受压状态的桁架上弦杆面外稳定性较弱。通过合理结构布置,增加上弦杆面外支撑,整体线性屈曲和非线性屈曲分析表明结构稳定承载力满足设计要求;通过支座比选,采取平板橡胶支座解决了温度荷载的影响;通过应力和挠度分析,计算结果表明结构的强度和刚度满足规范要求。

To satisfy the building clearance requirement,the roof deck is connected with the bottom chord of the truss,while the lateral stability of the top chord of the truss is relatively weak. By means of the reasonable structure arrangement and setting lateral brace members of the top chord,the stability bearing capacity meets the design demand according to the results of linear and nonlinear buckling analysis. By the comparison of different supports,the effects of the temperature load is resolved by the adoption of the plate rubber supports. The stress and deflection analysis is carried out,and the calculation results indicate that the strength and stiffness of the structure accord with the specifications of design codes.