两种不同曲面形状椭圆弦支穹顶结构性能对比与弹塑性稳定分析  

Structural performance contrast and elasto-plastic stability analysis of two elliptic suspendomes with different surface shapes

作　　者：于敬海[1] 王少华 王小盾[3] 黄兆纬[4] 李路川[1] 

机构地区：[1]天津大学建筑设计研究院,天津300073 [2]中国建筑西南设计研究院,成都610042 [3]天津大学建筑工程学院,天津300072 [4]天津市建筑设计院,天津300074

出　　处：《建筑结构》2017年第23期6-11,共6页Building Structure

基　　金：天津市科技支撑计划重点项目(13ZCZDSF01400)

摘　　要：椭圆弦支穹顶上部单层网壳曲面形状一般为椭圆抛物面或椭球面,对比分析了两种不同曲面形状对大跨度扁平椭圆弦支穹顶结构性能的影响。研究表明,椭圆抛物面弦支穹顶的结构性能优于椭球面弦支穹顶,大跨度扁平椭球面弦支穹顶不建议采用半椭球面作为上部网壳。当大跨度扁平椭圆弦支穹顶由稳定承载力控制时,宜进行弹塑性稳定分析,按弹塑性稳定极限承载力安全系数2.0进行设计优化;不建议只进行几何非线性分析,按弹性稳定极限承载力安全系数4.2进行设计优化,这样会造成较大的经济浪费。Elliptic paraboloid or ellipsoid is generally adopted in surface shape of the upper single layer reticulated shell of large-span flat elliptic paraboloid suspendome.The effects of the two surface shapes on structural performance of large-span flat elliptic paraboloid suspendome were compared and analyzed.The results show that structural performance of elliptic paraboloid suspendome is better than ellipsoid suspendome and half ellipsoid is not recommended in upper single layer reticulated shell of large-span flat elliptic paraboloid suspendome.If the large-span flat elliptic paraboloid suspendome is controlled by stability bearing capacity,it is appropriate to optimize design according to the coefficient of elasto-plastic stability bearing capacity which is 2.0; it is not recommended to just carry out geometric nonlinear analysis and optimize design according to the coefficient of elastic stability bearing capacity which is 4.2; otherwise it will cause large economic waste.

关 键 词：椭圆弦支穹顶 曲面形状 椭圆抛物面 椭球面 弹塑性稳定 安全系数 

分 类 号：TU393.3[建筑科学—结构工程]