【作者】 卢群鑫；

【导师】 高博青；

【作者基本信息】 浙江大学 ， 结构工程， 2003， 硕士

【摘要】 大型环状索杆结构兼有穹顶网壳结构和索穹顶结构的优点，是一种柔性索系和刚性杆件相结合的性能优越的张力集成自平衡体系。迄今为止对这种结构的研究在国内外均不多见。因此，系统、深入地研究该种结构的力学性能具有重要的理论意义和实用价值。 本文首先探讨环状索杆结构的有限元模型问题，分析了各种构件模拟所采用的有限元单元，并对预应力索这一最重要的构件作了较详细的描述，给出了索的数值模型、索的有限元列式以及索中预应力的引入方法。 本文在介绍了结构稳定分析理论和方法的基础上，采用弧长法解算了环状索杆结构的几何非线性稳定性问题，并研究了矢跨比、预应力等结构参数对其稳定性的影响。 文中研究了环状索杆结构的动力特性，分析了矢跨比、预应力、约束方式等结构参数对结构自振特性的影响，并与相应的单层网壳结构作了对比，得出一些有益于结构设计的结论。 本文分别采用反应谱法和时间历程法对环状索杆结构的地震响应作了较详细的分析，研究了矢跨比、质量分布对环状索杆结构地震响应的影响。 本文研究了布索对大型环状索杆结构力学性能的影响，同时分析矢跨比、预应力等结构参数变化时不同布索工况下结构的力学性能的变化，得出各类索对结构力学性能的影响，并由此得到几种优化的布索组合。 论文最后对上述研究内容及成果作了简单的总结，并指出进一步研究的方向和具体亟待完成的工作。更多还原

【Abstract】 As a tensegrity system,the large annular cable-bar dome has good performances. Up to now,few studies on this type of structure have been carried out at home and abroad. Thus,it is important to study the structural performances in theory and engineering.Firstly,the finite element model of the cable-bar structure is studied in this thesis. Being the most important member of the structure,the cable is described in detail. The problems of the numerical model and the finite element formula and the pretress application of cables are discussed in this thesis.On the basis of the basic theories and methods about stability analyses,arc-length method is used to analyze the geometrical nonlinear stability of the structure. And the effects of the rise-to-span ratio and the prestress in cables etc. on the structural stability are discussed.Compared with the relevant single-layer reticulated dome,the dynamic characteristics is studied and the effects of the rise-to-span ratio and the prestress in cables etc. on the dynamic characteristics are discussed in this thesis. Some proposals can be applied to practical engineering.The vibration shapes-separation-spectra-method and time-history method are used to analyze the dynamic response of the cable-bar structure under common earthquake. And the effects of the rise-to-span ratio and the mass distribution are studied.The effects of the cable arrangement on the structural performances are discussed in this thesis. The effects of the rise-to-span ratio and the prestress in cables with different cable arrangement are studied and the optimized cable arrangements are found.Finally,some conclusions are summarized and the topics for further research are put forward.更多还原