（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）

［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。

［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

中图分类号：TU393-3文献标识码：A文章编号：1002-848X(2017)23-0006-06

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

Yu Jinghai1, Wang Shaohua2, Wang Xiaodun3, Huang Zhaowei4, Li Luchuan1

(1 Architectural Design and Research Institute of Tianjin University, Tianjin 300073, China; 2 Southwest China Architectural Design & Research Institute, Chengdu 610042, China; 3 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 4 Tianjin Architectural Design Institute, Tianjin 300074, China)

Abstract: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.

Keywords:elliptic suspendome; surface shape; elliptic paraboloid; ellipsoid; elasto-plastic stability; safety factor

*天津市科技支撑计划重点项目（13ZCZDSF01400）。

作者简介：于敬海，博士，研究员，博士生导师，Email:yjh300072@163.com。