拟球面三角形网格密肋折板壳的动力特性分析

发布时间：2018-05-07 04:43

本文选题：拟球面 + 密肋折板壳　；参考：《贵州大学学报(自然科学版)》2015年06期

【摘要】：考虑矢跨比、主脊线刚度、副脊线刚度和边梁刚度等因素的影响,采用有限元方法对混凝土拟球面三角形网格密肋折板壳进行参数化自由振动分析,以考察结构的自振频率及振型特点。结果表明:结构自振频率具有密集分布的特点、成对出现的振型较多,频率-振型序号曲线具有明显的跳跃台阶;低阶振型主要表现为边界附近折板的竖向振动,振动节线大体为脊线;矢跨比对结构自振频率影响较大,建议结构矢跨比采用1/8~1/3;基于结构的传力特点,主脊线刚度对结构整体刚度的贡献有限,在满足结构承载力要求前提下,主脊线可采用较小的刚度;结构基频随副脊线刚度的增加而明显增长,增加副脊线刚度有利于提高结构整体刚度;边梁约束作用对结构整体刚度没有明显影响。
[Abstract]:Considering the factors such as rise-span ratio, main ridge stiffness, auxiliary ridge stiffness and side beam stiffness, the parametric free vibration analysis of concrete quasi spherical triangular mesh folded plate shell is carried out by using finite element method. In order to investigate the natural vibration frequency and mode characteristics of the structure. The results show that the natural frequencies of the structure are densely distributed, and there are more vibration modes in pairs, the frequency-mode ordinal curve has obvious jump steps, and the low-order vibration modes are mainly the vertical vibration of the folded plate near the boundary. The vibration nodal line is generally a ridge, and the rise-span ratio has a great influence on the natural vibration frequency of the structure. It is suggested that the rise-to-span ratio of the structure should be 1 / 8 / 1 / 3. Based on the characteristics of the structural force transmission, the contribution of the main ridge stiffness to the overall stiffness of the structure is limited. The base frequency of the structure increases obviously with the increase of the stiffness of the auxiliary ridge, and the increase of the stiffness of the secondary ridge is beneficial to the improvement of the overall stiffness of the structure, while the restraint of the side beam has no obvious effect on the overall stiffness of the structure.
【作者单位】：贵州大学空间结构研究中心;湖南大学土木工程学院;
【基金】：国家自然科学基金项目资助(51568012)
【分类号】：TU311.3

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