局部索杆失效对肋环人字型索穹顶结构受力性能的影响
发布时间：2019-03-13 07:39
【摘要】：肋环人字型索穹顶是一种突破传统Fuller思想的新型索穹顶结构。以一跨度90 m的肋环人字型索穹顶为研究对象,采用向量式有限元方法,模拟脊索松弛和每一类杆件分别破断失效后结构的内力和变位时程响应,通过定义动内力系数、内力变异系数和观察结构主要节点位移来划分各类杆件的安全等级,判断部分杆件失效后结构是否倒塌和是否具有承载能力。计算结果表明,单根杆件的破断均不会引起结构的整体失效,但结构动力响应显著,部分杆件的最大动内力会超过屈服极限。根据计算结果分析可知,环索和脊索的安全等级高于斜索和撑杆,外圈杆件的安全等级高于内圈杆件。
[Abstract]:Rib ring herringbone cable dome is a new type of cable dome structure which breaks through the traditional Fuller idea. Taking a ribbed ring domes with a span of 90 m as the object of study, the vector finite element method is used to simulate the internal force and displacement time-history response of the structure after the relaxation of the chordal cable and the failure of each kind of bar respectively, and the dynamic internal force coefficient is defined by the definition of the dynamic internal force coefficient. The coefficient of variation of internal force and the displacement of the main nodes of the structure are observed to divide the safety grade of all kinds of members, and to judge whether the structure collapses or not after some members fail and whether the structure has the bearing capacity or not. The results show that the failure of single member will not cause the overall failure of the structure, but the dynamic response of the structure is remarkable, and the maximum dynamic internal force of some members will exceed the yield limit. According to the analysis of calculation results, the safety grade of ring rope and chordate is higher than that of slant cable and brace, and the safety grade of outer ring member is higher than that of inner ring member.
【作者单位】： 浙江大学空间结构研究中心;
【分类号】：TU399
[Abstract]:Rib ring herringbone cable dome is a new type of cable dome structure which breaks through the traditional Fuller idea. Taking a ribbed ring domes with a span of 90 m as the object of study, the vector finite element method is used to simulate the internal force and displacement time-history response of the structure after the relaxation of the chordal cable and the failure of each kind of bar respectively, and the dynamic internal force coefficient is defined by the definition of the dynamic internal force coefficient. The coefficient of variation of internal force and the displacement of the main nodes of the structure are observed to divide the safety grade of all kinds of members, and to judge whether the structure collapses or not after some members fail and whether the structure has the bearing capacity or not. The results show that the failure of single member will not cause the overall failure of the structure, but the dynamic response of the structure is remarkable, and the maximum dynamic internal force of some members will exceed the yield limit. According to the analysis of calculation results, the safety grade of ring rope and chordate is higher than that of slant cable and brace, and the safety grade of outer ring member is higher than that of inner ring member.
【作者单位】： 浙江大学空间结构研究中心;
【分类号】：TU399
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