Approximate optimization and performance analysis of rigid cable dome structure
WU Hui1,CEN Di-Qin2,GAO Bo-qing2
1.Finance and Economics of Zhejiang College,Hangzhou 310018,China； 2.College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China
There are some problems for cable dome structures,like the ridge cables are easy to be out of work,the construction requires high technology and outermost ring beams are always with high compressive force. To solve these problems, a type of rigid cable dome structure was presented, replacing ridge cables by rigid members. Approximate optimization was carried out using uniform design method. As an example, a 60m-span Geiger rigid cable dome subjected to symmetrical uniform load was analyzed using U12(37) uniform table. First the approximate functional relation between outcome indicators and design parameters was established. Then an approximate optimum rigid cable dome structure was obtained and the optimum result was verified by extreme value analysis. On this basis, comparing with the conventional cable dome,conclusions are arrived that the upper chords of rigid cable dome structure are under tension, only diagonal cables are necessary to be tensioned during the structural construction and the force of outermost ring beam decrease gradually with the load increasing．
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