【作者】 王磊；

【导师】 王秀丽；

【作者基本信息】 兰州理工大学 ， 结构工程， 2007， 硕士

【摘要】 单层组合椭球网壳是由两个半球壳和一个柱面网壳组合而成，这种网壳适用于大跨度体育馆、会展中心、工业堆放仓库等建筑。随着我国经济不断发展，对此类建筑的需求增加，我国是地震多发国家，高烈度区分布广泛，若对跨度较大的单层网壳结构采用传统抗震理论设计，经济性、安全性都很难满足要求。本文将屈曲约束支撑这种耗能元件应用于单层网壳结构构成减震系统，根据网壳力学性能提出支撑布置原则和减震效果的评价指标，对支撑布置位置作了具体的方案设计。首先根据网壳组成和杆件连接规律编程实现自动化建模，由稳定承载力近似相等的原则对拟分析的网壳进行网格划分和截面选择，对网壳进行静动力分析，掌握结构变形特征、节点位移分布规律等；由等截面原则做支撑替换，力求减震系统和原网壳静力等效，自振频率接近，确保两类结构具有可比性，然后对减震系统作弹性阶段反应谱分析和弹塑性阶段的时程分析，得到节点位移减震规律、支撑屈服进展及耗能状况，通过对比对减震系统工作性能作出评价；根据工程实际，对多维地震输入、矢跨比、跨度做了参数分析，得到各个参数对减震系统的影响结果，并作相应的理论分析，给出具体建议。本文提出的屈曲约束支撑布置原则可用于其它形式的单层组合网壳减震分析，对单层组合椭球网壳的相关研究结论可用于工程设计，也为进一步的单层网壳减震研究提供参考。更多还原

【Abstract】 Single layer ellipse lattice shell consists of two hemi-sphere shell and a cylindrical shell, such shell can be applied to many types building such as stadium meeting&exhibition hall and industry storage etc. Those buildings will be demanded more in our nation with economy development. But earthquakes happen often in the scope of the land we live, and high intensity area distribute widely, so economics and safety of long spatial shell can hard be meet if we adopt traditional anti-seismic theory during the course of design.It is the Buckling Restrained Braces (abbreviation: BRBs)--a type of component dissipating energy when yielding that is applied to single layer shell to make vibration reducing system, corresponding principles of BRBs’ location and appraisal indexes of vibration reducing effect are put forward in the paper based on the obtained mechanics performance of the shell, and concrete schemes of BRBs’ location are designed. First of all, a program is made accord to the types of combination shell and members connection law to realize automatic modeling, grids calculation and members’ cross-section selection are derived from the regulation of approximate equivalence of stable bearing capability, to know clearly the shell deformation mode and nodes’ displacement distribution law is by means of static and dynamics analysis on the shell; to assure the shell and the vibration reducing system can be compared with each other such pre-conditions should be prepared, which are the principle of equivalent cross-section area when BRBs substitute to members, statics equivalence between the shell and the vibration reducing system, and approximate equivalence of frequencies when free vibration happens. Subsequently, seismic spectrum analysis during elastic phase and time-history analysis when plastic strain is produced in BRBs of the vibration reducing system, to obtain nodes’ displacement reducing distribution, progressive yielding and energy dissipating of BRBs, and give appraisal on performance of vibration reducing systems by comparison with each other; To focus on engineering practices, Multi-dimension Earthquake Excitation, Height to span ratio and Span are calculated respectively as influencing parameters, so as to obtain such parameters’ effect on performance of those vibration reducing system, some theory analysis is finished and pieces of concrete suggestion are concluded in the end.Principles of BRBs’ location put forward in this paper can be applied tovibration reducing analysis of other types combination single layer shell, some conclusions drew from single layer ellipse lattice shell can be used in engineering practices, or support progressive study on vibration reducing of single layer shell.更多还原