杂交型椭球面网壳静、动力性能分析及形状优化设计

发布时间：2018-03-21 22:11

本文选题：杂交型椭球面网壳　切入点：参数化设计　出处：《山东建筑大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,我国建筑技术水平进入到飞速发展的阶段,人们对于跨度更大、要求更高的空间结构的需求越来越多。而空间网壳结构以其新颖的造型、合理的受力性能逐渐受到人们的青睐。早期的网壳结构都是单一类型的直接运用,但伴随着这种大跨结构的飞速发展,工程师们开始尝试不同类型的结构进行杂交组合,使结构更加美观,受力更加合理,同时还可以降低工程成本。这种新型杂交网壳结构力流传递合理、几何构造简单,同时,也有效地克服了单一类型结构的诸多弊端。如肋环型结构顶点杆件密集无法施工,施威德勒型结构应力集中现象等。本文主要工作有:1.引入杂交型椭球面的方程及比例系数t,确定杂交型椭球面上点的坐标,再根据网壳特定的布杆规律,采用参数化设计语言(APDL)对椭球面网壳结构进行杂交组合的参数化设计,得出六种杂交型椭球面结构的模型,然后分别对其进行受力性能分析。2.应用ANSYS软件,首先对两类六种杂交型椭球面网壳进行静力性能分析,再与传统单一型椭球面网壳进行比对,找出受力性能较好的结构类型。然后通过改变结构的跨度,矢高,上部径向节点圈数占总径向节点圈数的比例,环向区域分数来对受力性能最好的凯威特—肋环杂交型椭球面网壳进行形状优化设计,从而得出最好参数配比,节约工程成本。3.根据空间直角坐标系下的杂交型椭球面方程,确定杂交型椭球面上各节点的坐标,进而根据空间两点间的距离公式,推导出结构上任意一根杆件的几何参数关系式,从而得出两类六种杂交型椭球面网壳杆件长度与其宏观几何参数之间的关系式。4.选取6种杂交型椭球面网壳结构中受力性能最好的凯威特—肋环型椭球面网壳,对其进行地震荷载作用下的响应分析,分析其自振特性,及网壳结构各参数对地震频率的影响。
[Abstract]:In recent years, the level of construction technology in our country has entered the stage of rapid development. People need more and more space structures with larger span and higher demands. Early reticulated shell structures were used directly by a single type, but with the rapid development of this kind of long-span structures, engineers began to try different types of structures for hybrid combination. The new hybrid reticulated shell structure has the advantages of reasonable force flow transfer, simple geometric structure, and low engineering cost. It also effectively overcomes many disadvantages of single type of structure, such as the dense vertex members of ribbed ring structure can not be constructed, The main work of this paper is: 1.Introducing the equation of hybrid ellipsoid and its proportional coefficient t, determining the coordinates of points on the hybrid ellipsoid, and then according to the special rules of the grid shell, The parametric design of ellipsoidal reticulated shell structure is carried out by parametric design language (APDL). Six kinds of hybrid ellipsoid structure models are obtained, and then the mechanical properties of six kinds of hybrid ellipsoid structures are analyzed respectively. 2. Using ANSYS software, The static behavior of two kinds of six kinds of hybrid ellipsoidal reticulated shells is analyzed, and then compared with the traditional single ellipsoidal reticulated shells, the structural types with better mechanical properties are found. Then, by changing the span of the structure, the vector height is obtained. The ratio of the number of upper radial node cycles to the total number of radial node cycles and the ring-region fraction are used to optimize the shape design of the hybrid ellipsoidal reticulated shell with the best mechanical performance, and the best parameter ratio is obtained. According to the hybrid ellipsoid equation in the spatial rectangular coordinate system, the coordinates of the nodes on the hybrid ellipsoid are determined, and then the distance formula between the two points in space is used to determine the coordinate of each node on the hybrid ellipsoid. The relationship between geometric parameters of any member of the structure is derived. Thus, the relationship between the length of six kinds of hybrid ellipsoidal reticulated shell members and their macroscopic geometric parameters is obtained. 4. Among the six hybrid ellipsoid reticulated shell structures with the best mechanical performance, the Kewitt-ribbed ellipsoid reticulated shell is selected. The response of the latticed shell structure under the earthquake load is analyzed, and the natural vibration characteristics and the influence of the parameters of the reticulated shell structure on the seismic frequency are analyzed.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU399

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