肋环型球面网壳结构的静动力分析

【作者】 谢志红；

【导师】 李丽娟；

【作者基本信息】 广东工业大学 ， 结构工程， 2004， 硕士

【摘要】 球面网壳结构由于受力合理、用料经济、造型美观，能覆盖较大空间，近十年来发展速度惊人，其发展前景广阔，是一种理想的空间结构形式。目前网壳结构的研究主要集中在静力稳定性能，对其抗震性能研究进行的较少。为此，本文采用有限元方法，对肋环型局部双层、铝合金双层球面网壳结构进行了静、动力分析。主要包括以下几个方面的内容： 1．对肋环型局部双层球面网壳结构进行了稳定性分析。在大跨度结构中，将单、双层网壳结合起来形成的一种结构形成—周边双层中部单层的球面网壳结构，可充分发挥两种结构形式的优点。本文采用钢、铰接模型，即单层部分采用空间梁单元，双层部分采用空间杆单元，应用弧长法跟踪了网壳结构的平衡路径，总结了此类网壳结构的失稳规律，并且得出了结构由单层过渡到双层时临界荷载的变化规律。 2．分析了肋环型铝合金双层球面网壳结构的自振特性，考虑了结构多种参数的影响，并且与同种结构形式的钢网壳进行了对比。 3．采用时程分析法对肋环型铝合金双层球面网壳结构进行了地震分析，得出了结构在地震荷载作用下的位移、轴向应力的变化曲线，并且与谱分析结果以及相应的钢网壳作了比较。同时考虑了几何非线性的影响，在几何非线性的影响下分析结构随跨度、矢跨比、网格频数等参数受地震荷载的响应情况，对工程应用提出有科学价值的建议。更多还原

【Abstract】 Spherical reticulated shell is of great prospect because of its economy, large span. In the recent ten years, reticulated shell structure develops very quickly. Most researches of reticulated shell focuses on static stability behaviors, but not on seismic behaviors. Thus, in this paper ,FEM is adopted to do static and dynamic analysis of partial double layer and aluminum alloy double layer spherical reticulated shell. The following content are mainly considered:1. Analysis of stability behaviors of partial double-layer cable dome is done. The advantages of two different structural types can be fully developed by combining the single-layer spherical dome and the double-layer square pyramid space grids into a new structural type. The equilibrium path is traced using the arc-length scheme with the rigid-pin-joint model in which the spatial beam elements are used in single-layer parts and spatial truss elements are used in the double-layer parts. Thus the stability behavior is summarized and the critical load is obtained.2. The vibration natural frequency of aluminum alloy double-layer cable dome is analyzed and several factors of the reticulated shell are considered as well.3. Seismic response analysis is done by using time history analysis method in aluminum alloy double-layer cable dome and the displacement and the axis stress of the structure under the seismic response are obtained and the results are compared with the ones of the spectrum analysis. In addition, based on the analysis of several factors including the single-double-layer span ratios, the height-to-span ratios and the pipe types, the nonlinear analysis gives important suggestion to engineering application.更多还原