作　　者： ; ; ; ;

机构地区： 华南理工大学

出　　处： 《空间结构》 2005年第4期36-39,26,共5页

摘　　要： 以双层球面网壳为研究对象,对其进行结构的几何优化设计和在地震荷载下的反应分析.首先分析了结构自振特性随几何参数变化的特点,研究了结构的基频随矢跨比、跨度、网格分割频数及网壳厚度变化的规律,然后采用Newmark积分法对其在多维地震作用下的反应进行了时程响应分析.研究结果表明,在结构跨度一定时,存在一个优化的矢跨比范围,约为1/3～1/4,该范围内,结构的整体刚度存在一极大值;对矢跨比一定的结构,结构跨度的增加将显著减低结构的整体刚度,从而减低结构的自振频率;对于跨度和矢跨比一定的结构,结构的基频随结构分割频数、网壳厚度的改变变化很小. This paper is concerned with the geometrical optimum design and the anti-seismic analysis of double-layer grid shell structures. In the paper, the characteristic of free vibration of grid shell structures with respect to geometric parameter is studied. The variations of eigen-frequency of shell structures with the ratio of height-to-span, span, grid division frequency and thickness of shell are discussed. A Newmark method is used to calculate the stresses and displacements of the grid shell structures under earthquake action. The analysis results show that at the specified span, the eigen-frequency of the structure will increase with the increase of the height-to-span ratio at beginning, and then decrease afterwards. Therefore, there is an optimization height-to-span ratio and consequently an optimization stiffness at the specified span. The optimization value of the ratio of height-to-span is found to be about 1/3-1/4 from the simulation study presented in this paper. At the specified height-to-span ratio, the increase of the values of span of structure will greatly reduce the eigen-frequency of the structure and then decrease the global stiffness of the structure. At the specified span and height-to-span ratio, the eigen-frequency of structure has little increase with the increase of the thickness and the grid division frequency of the grid shell structures.

关 键 词： 球面网壳 抗震分析 刚度优化

领　　域： [建筑科学]