索膜结构挑蓬设计及其其膜结构事故分析.pdf

浙江大学硕士论文摘要索膜结构挑蓬设计及膜结构事故分析摘要索膜结构体育场挑篷是一种不同于传统结构的挑篷结构形式,由于其独特新颖、优美丰富的造型而越来越得到广泛的应用。并且它打破了以往“先建筑,后结构”的设计过程,结构工程师一开始就直接参与到建筑的选型过程中来。索膜结构挑蓬的设计过程大致可以分为四个阶段。第一阶段是找形设计阶段,即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; 第二阶段是荷载分析阶段,即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;第三个阶段是裁剪分析阶段,即生成平面膜材的裁剪下料图;第四个阶段是将上部索膜结构在外荷载作用下输出反力施加在下部钢结构上进行校核。本文推导了用力密度法进行索膜结构形状确定的理论公式。并且通过力密度法对某体育场司令台挑蓬进行形态分析,然后在此基础上运用非线性有限元法进行荷载分析。总结了膜结构撕裂事故的各种原因,并对膜结构通病及一些工程破损、破坏事故进行了分析。对一膜结构工程事故进行了研究,比较了实际结构与原设计结构在相同风荷载下的受力情况,得出了膜面可能导致撕裂的原因。设计了四种破损部分膜结构的加固方案,并且进行了比较,得出了最为优越的加固结构。对加固结构抗风索在不同预应力下进行受力比较,发现了一些规律。关键词:索膜结构挑蓬、找形、荷载分析、力密度、工程事故、抗风索浙江大学硕士论文 ABSTRACT Design ofCable andMembrane Structures Awning and Analysis on Accident ofMembrane Structure Projects ABS’瞰CT The cable andmembrane structure awning ofstadium is aawning structure form which isdifferentform traditionalones,It isapplied more and more widely inthe projects due toitsparticular andnovelty itbreak theanciently design procedure which isarchitecturefirst,structure second. The whole design procedure ofcable and membrane structures awning posed of three parts·The first one isform'finding aim ofthispart itis tofind asatisfying tensioned surface under theequilibrium between cable forceandmembrane second is loading on thefound form,it isexpected toget thestrainand stressofcable and membrane structures under third one iscuaing pattem analysis,which generated the number ofmembrane block and the cuHing last one iscalculate theresultofthe infrastructureunder theloadswhich arepassedform superstructure. Thisthesisderived theequation offorce density method..And astadiumawning hasbeen designed forcedensity method hasbeen used toanalyze theshape,and thenonlinear finitemethod hasbeen used toanalysis theloads. Summarize the reasons ofmembrane structure lacerated accident and other membrane mon ,the thesistake aresearch on a membrane project pare the resultsofthepractical struct