【作者】 方江生；

【导师】 远 方；

【作者基本信息】 天津大学 ， 结构工程， 2004， 硕士

【摘要】 弦辐穹顶（Chord Spoke Dome）是一种全新的预应力索杆结构体系，它的布索方案来源于“连续压间断拉”的平面弦辐结构的构造原则，同时又吸收了“连续拉间断压”张拉整体索穹顶结构的很多优点，形成的一种独特的、完整的结构体系。弦辐穹顶结构，具有许多优良的力学性能和新颖的建筑造型，这些都是其它结构形式无法比拟的，因而，这种结构形式有着广阔的发展前景。但是，迄今为止，还没有哪一位学者对这种结构形式做过研究分析，所以，本文试图从各个角度对这种结构做比较全面的分析，以促进这种结构能在工程实践中得以实现。本文的前半部分，首先详细论述了弦辐结构产生的背景和研究的现状，提出了弦辐穹顶结构的新构想。其次对弦辐穹顶结构做了结构形态分析，构造出了各种各样几何外形的弦辐穹顶，并结合弦辐穹顶结构的几何特点，提出了以开关天窗的方式实现结构开合的思想。紧接着完成了弦辐穹顶结构的几何构造分析，给出了其中一种弦辐穹顶结构的整体可行预应力的分布模态，判定了其几何稳定性，并在此基础上将弦辐穹顶结构体系与张拉整体索穹顶结构体系，做了比较全面的对比分析。本文的后半部分，都是以Visual Basic语言为界面，编制了非线性有限元的分析程序，分别对弦辐穹顶结构做了荷载态分析、施工过程跟踪分析以及可靠性分析。在做荷载态分析时，详细推导了空间杆系结构的几何非线性有限元分析方法，计算出了弦辐穹顶结构在全跨均布荷载作用下的力学反应。在做施工过程跟踪分析时，先介绍了一般索杆张力结构的施工方法，探讨了这些施工方法的一些局限性，提出采用增加调节索的办法，对弦辐穹顶结构进行施工，取得了较好的效果。在做可靠性分析时，阐述了传统结构体系可靠度分析方法的局限性，创造性地提出了基于计算机仿真思想的结构体系可靠度的分析方法——扩展荷载减量法，并以此为基础，总结提出了以可靠度为最终指标的全新的结构设计理念。更多还原

【Abstract】 Chord spoke dome is a novel pre-stressed cable-grids structure. Its project of laying out cables is rooted in the formation principle of the “continuous compression and isolated tension” plane chord spoke structure, and at the same time, it is absorbed in many virtues of the “continuous tension and isolated compression” tensegrity cable dome, and forms a particular and integrated structure system. Chord spoke dome has many excellent mechanics behavior and novel architectural sculpt, which are incomparable with other structure forms. Thus, this structure form has widest development foreground. However, there is not any scholar who once analyzed this structure form by now. So this dissertation tries to make a comprehensive analysis of chord spoke dome from various points of view, aiming to help realize its application in engineering practice.In the first-half part of whole paper, the paper firstly mentions the procreant background and the research status of chord spoke dome in detail, and points out a new type space structure —— chord spoke dome. Secondly the paper makes shape analysis of chord spoke dome and conceives lots of domes with various geometrical forms. Combined with the geometrical characteristics of chord spoke dome, a new idea of retractable structure is pointed out which is based on the mode of retracting sky-window. Then the paper completes the geometrical analysis of chord spoke dome, calculates one of the distribution modes of the feasible pre-stress and makes a judgment of the geometrical stability. On the base of these, the paper makes a comprehensive comparative analysis between chord spoke dome and tensegrity cable dome.In the second-half part of whole paper, the paper programs with nonlinear finite element method by using Visual Basic computer language as the program interface and makes load-state analysis, construction process analysis, and reliability analysis of chord spoke dome. When making load-state analysis, the paper derives geometrical nonlinear finite element method of space grid structure and calculates the mechanics feedback of chord spoke dome under entire-span and uniformly distributing static load. When making construction process analysis, the paper introduces some construction <WP=5>methods of common cable-strut tensile structure and mentions some limitations of these methods and points out a new method of using adjustable cables. It has been proved to be a highly efficient method for constructing chord spoke dome. When making reliability analysis, the paper mentions some limitations of traditional analysis methods of structure system reliability and creatively points out a new analysis method based on computer simulation ——reduced expanding load method, and a new structural design idea which uses reliability as the last index is summed up and come up with.更多还原