索膜结构分析全过程.pdf

浙江人学坝l。学位论史中文摘监索膜结构分析的全过程摘要索膜结构的设计、分析过程大致可以分为三个阶段。第一阶段是垫璺堡盐阶段;郐满足索膜初始张力平衡条件,同时接近设计者预想的曲面形状的求解过程:)—一~ 第二阶段是荷载分析阶段;卸由初始形态设计的曲面形式,在各种外荷载作用下, 求解其变形、索膜内力的过程土要三个阶段是裁剪分析阶段。函生成平面膜材的裁剪下料图。荷载分析过程相对于其它两个分析过程来说,其分析方法和计算手段都是比 p—, 较成熟的。面第一阶段找形分析和第三阶段裁剪分析是索膜缝塑塑计分析的关键技术。本文介绍的重点也在这两个阶段。本文介绍的有限元分析方法以及测地线裁剪都是国内外较为常用的索膜结构设计方法。通过算例,本文验证了有限元找形方法的有效性和实用性。同时,在算例中本文也发现了一些有趣的现象,并从力学的角度提出了自己的解释。此外,本文还从比拟的思想出发,介绍了一种新, 的裁剪方法,即无约束极值的裁剪分析方法。,通过算例和工程的检验,也证实了这种方法的实用性和可行性。卜v““/ | 。Vq 洙膜结构是随着现代科学技术以及计算机技术的发展而兴起的。)本文也介绍/ 本人在设计和研究过程中,不断完善的计算机设计程序。关键词:索膜结∥有限影找形、荷载分∥裁剪丫测地线、无约束极值、可视化- i _} 浙江人学坝l。学位论义 ABSl’RACT 2002 The Procedure ofCable andMembrane Structures’Analysis ABSTRACT The whole procedure ofcable andmembrane structures’analysis posed of threepans The first one isform-finding aim of thispart itis tofind a sarisfying tensioned surface under theequilibrium between cable forceandmembrane second on thefound form,it isexpected toget thestrainand stress ofcableandmembrane structures under the last one is cutting pattern analysis,which generated thenumber ofmembrane block and the cutting method Form—finding analysisandcuuing patternanalysis is thekey todesign ofcable andmembrane thevalidity ofloadinganalysis ismore than theothers, because of thesimilarity with the thispaper,a finiteelement method ofform—finding analysis,which is alsovalid toloadinganalysis,is introduced. With theintroduced geodesic cutting method,the two methods arepopular indomain of cable and membrane addition,a new cutting method,named non—restraintextremum method,is theexample andproject, thefeasibility ofthesemethods isvalidated. With theprogress ofscience and technology,tension structures are developed in the recent years As anassistant tool,visibledesign software isindispensable tocable andmembrane works have been done in theprocess ofwriting this papel maddesign membrane structures. Keyw