径向波形单层网格阳光顶结构分析与设计

Structural Analysis and Design of a Day-Lighting Roof with Radial Waveform Single-Layer Grid

采用局部建模计算和整体建模计算相结合的方式,对径向波形单层网格阳光顶进行了结构分析。根据排水要求确定波谷积水荷载,根据玻璃幕墙要求确定钢网格大小。局部采用三角形网格,提高了结构承载力和刚度,减小了阳光顶的挠度。通过增加钢柱数量,减小钢柱直径,提高了结构抗震性能和稳定承载力。整体稳定分析考虑了材料非线性、几何非线性和初始几何缺陷,初始几何缺陷计及1~4阶屈曲模态的正负向。采用直接分析设计法解决钢柱长细比超限问题。通过局部模型和整体模型的对比,评估整体结构对阳光顶的影响。结构分析表明径向波形单层网格阳光顶在结构上是可行的。

In combination of an entire model and local model method,a day-lighting roof with radial waveform single-layer grid is studied in this paper.The ponding load in trough is determined from the requirement of drainage design,and the dimensions of steel grid are determined based on the maximum area of single curtain glass.Triangle grids are partially adopted to increase the strength and rigidity of the structure,and to decrease the deflection of day-lighting roof.By adding number of steel columns and reducing their diameters,the seismic behavior and bearing capacity of the roof are enhanced.Material and geometric nonlinearities and initial geometrical imperfection on positive and negative values from the first buckling mode to the fourth buckling mode are accounted in overall stability analysis.The over limit on the slenderness ratio of steel column is solved using the direct analysis method.Comparing partial model with entire model method,the effect of whole structure on the day-lighting roof is evaluated.The results show that the daylighting roof with radial waveform single-layer grid is applicable in structural design.