张弦巨型网格结构动力特性研究

发布时间：2018-01-24 14:12

  本文关键词： 张弦巨型网格结构 模态分析 动力特性 参数分析　出处：《防灾减灾工程学报》2016年05期 　论文类型：期刊论文

【摘要】：针对由张弦梁概念和巨型网格结构组合而成的一种新型超大跨空间结构,通过模态分析研究结构的动力特性,首先将主体结构单独承载和子结构协同承载两种情况下张弦巨型网格结构的前12阶自振周期及相应振型进行比较,然后对结构首阶各向振型的出现次序及相应自振周期进行了主体结构矢跨比、桁架梁高度、撑杆长度、预应力大小等一系列参数分析并与未布索结构作对比,详细研究了结构各方向刚度随不同参数改变时的变化情况。结果表明,主体结构单独承载时结构的纵向刚度最弱,子结构的引入能够极大地增强结构水平纵向刚度;预应力体系的引入可以显著提高结构的拱向及竖向刚度。为保证预应力提高结构竖向刚度的效果,主体结构应取较大矢跨比,且桁架梁高度的取值不宜太大。
[Abstract]:The dynamic characteristics of a new type of large span space structure, which is composed of the concept of beam string and the giant grid structure, are studied by modal analysis. Firstly, the first 12 order natural vibration periods and the corresponding vibration modes of Zhang Xian giant grid structure are compared under the condition of the main structure bearing alone and the substructure carrying together. Then a series of parameters, such as the rise-span ratio of the main structure, the height of the truss beam, the length of the bracing rod, the prestressing force and so on, are analyzed and compared with those of the uncabled structure. The variation of structural stiffness in different directions with different parameters is studied in detail. The results show that the longitudinal stiffness of the main structure is the weakest when the main structure is loaded alone. The introduction of substructure can greatly enhance the horizontal longitudinal stiffness of the structure. The introduction of prestressed system can significantly improve the arch and vertical stiffness of the structure. In order to ensure the effect of prestress to improve the vertical stiffness of the structure, the main structure should take a large rise-span ratio, and the value of the height of the truss beam should not be too large.
【作者单位】： 湖南大学土木工程学院;重庆大学土木工程学院;
【基金】：教育部博士点基金项目(0161110019) 湖南省高校科技创新团队项目(湘财教指(2012)80号)资助
【分类号】：TU399
【正文快照】： 引言人类社会的发展,对空间结构的跨度提出了更高的要求[1-2],而单一形式的结构已无法满足超大跨度的需求。为此,各国科技工作者不断探索,将几种单一形式的结构进行有机组合[3-4],以改善结构受力性能,增加跨度。张弦梁结构[5]是目前较成熟的一种组合结构,由撑杆、拉索及刚性压，

本文编号：1460238