非轴对称肋环型索穹顶自平衡初始预应力计算

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英文篇名：Calculation about Self-blanced Initial Prestress of Rib-patterned Cable Domes with Non-axisymmrtric Shape 作者：骆德奎 ; 尚仁杰 ; 吴向东 ; 朱岩 英文作者：Luo Dekui;Shang Renjie;Wu Xiangdong;Beijing Fifth Construction Engineering Group Co.,Ltd.;Central Research Institute of Building and Construction Co.,Ltd.,MCC Group; 关键词：索穹顶 ; 肋环型索穹顶 ; 自平衡 ; 初始预应力 ; 椭圆形 英文关键词：Cable dome;;Rib-patterned cable dome;;Self-balanced;;Initial prestress;;Elliptical shape 中文刊名：TZJG 英文刊名：Special Structures 机构：北京市第五建筑工程集团有限公司;中冶建筑研究总院有限公司; 出版日期：2015-08-15 出版单位：特种结构 年：2015 期：v.32;No.143 语种：中文; 页：TZJG201504019 页数：5 CN：04 ISSN：11-1943/TU 分类号：67-71

摘要

本文提出了一种适合于非轴对称平面布置的肋环型索穹顶结构自平衡初始预应力计算方法,该方法要求索穹顶的各圈环向索平面形状几何相似。首先选定最外圈一段环向索的初始预应力值为1000α,根据力的平衡,计算出最外圈所有环向索段的初始预应力值,并计算出最外圈脊索、斜索及撑杆的初始预应力值。根据力的平衡及最外圈各索的初始预应力值,可以计算相邻内圈各索的初始预应力值。由外向内逐圈计算出所有索的初始预应力值。当几何尺寸一定时,各索段初始预应力间成线性关系,可以按一定比例系数提高或降低整个索穹顶的初始预应力水平,从而满足各种荷载工况下的受力要求。最后,通过一个椭圆形平面布置的索穹顶结构算例介绍了本文方法的计算过程并验证了本文方法的正确性。
        A method to calculate the self-balanced initial prestress of rib-patterned cable domes with nonaxisymmetry shape was introduced in that the paper,and it was required in the method that the shapes of every hoops of the dome were geometrically similar.The initial prestress of one section of the outmost hoop cable was selected to be 1000α firstly,based on force balance,the initial prestresses of all cables of the outmost hoop could be calculated and the equations to calculate the initial prestresses of the ridge cables,down cables and struts of the outmost hoop were given.The initial prestresses of adjacent inner hoop cables could be calculated.The initial prestresses of the outmost hoop cables.Through the outside-in approach,the initial prestress were linear each other when the geometry of the dome was determined.The intimal prestress of the dome could be increased or decreased by a scale factor so as to satisfy different working conditions.The method was introduced by an example of a ribpatterned cable dome with elliptical shape at last,and the method was verified.

引文

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