Analysis Of A Novel Cable-strut Tensile Structure-"Chord Spoke Dome"

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 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.