某体育馆上盖张弦梁设计

The String-Beam Design of a Gym Roof

某体育馆平面尺寸为69.2 m×21.0 m,为满足建筑效果,在21.0 m跨度方向布置15榀单向张弦梁,本文主要运用两种软件进行分析,其中整体分析采用MIDAS GEN,节点分析采用ABAQUS,主要从如下4个方面对张弦梁进行计算论证保证安全:(1)根据平衡态寻找初拉力;(2)由于建筑功能原因,张弦梁上弦较平,会产生较大的水平推力,本文通过调整施工顺序分析解决造型产生的推力及水平变形;(3)通过线性及非线性屈曲分析计算上弦稳定性;(4)支座处复杂节点材料非线性分析。通过以上4个方面计算保证项目安全可靠,可为类似张弦梁结构的设计提供参考。

The layout of a certain stadium is 69.2 m×21.0 m.In order to meet architectural effect,a truss with 15 one-way string beams was arranged in the 21.0 m span direction.Two softwares were adopted,Midas Gen for overall analysis and Abaqus for node analysis.Safety of the string beams was ensured from four aspects:(1)Determination of initial tension according to equilibrium state;(2)Solution of large horizontal force generated by flat upper chord of the string beams by adjusting construction sequence.(3)Calculation of stability of the upper chord by linear and nonlinear buckling analysis.(4)Calculation of complex joints by nonlinear analysis of materials.The above four aspects ensure safety and reliability of the project,and can provide reference for the design of similar beam structures.