基于可靠性的非线性钢框架结构优化设计

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1、天津大学硕士学位论文基于可靠性的非线性钢框架结构优化设计姓名：赵荣家申请学位级别：硕士专业：船舶与海洋结构物设计制造指导教师：郭振邦20070101Thesteelflamehastheextensiveapplicationinmanyhi曲publicbuildingandvariousindustrybuildingstructures(includetheoceanterracestructIlre，thepowerstationboilerthes仇lcturetopropup，themin

2、eralmountainopencastwelletc．)．Comparedwiththecommonreinforced-concrete丘砒m，thesteelframe如nlcturehastheweightlight,thestrengthishigh，theductilityisbig，anti—earthquakefunctionisgood，constructionspeedquick,thepieceofcutsissmalletc．advantage，therefore，alongw

3、ith0111"countr、jtheeconomicpowerstrengthenedandtechniquelevelraised，thesteelframestructurewillmoreandmoreextensivelyapplied，andbecomeourcountryoneofthemainstructI】resystems．thistextmainlystudiesoptimizeddesignmethodofthenonlinearsteelframestructure，incl

4、ude：theintemalforceanalytical，thecalculationofthereliabilityindex，GeneticAlgorithmappliesinthenonlinearsteelfi-alneunderthereliabilitycontr01．Intheconventionaldesignofasteelfl'alne，thefirststepistodeterminetheinternalforcesandmomentsbyusingglobalanalysi

5、sbasedonfirstordertheory．SecondordereffectsarereflectedindirectlybythefactorsofeffectivelengthandthefactorsofequivalentmomentduringthedesignofmembersinsuccessionUnfortunately,itisdifficulttoobtaintheaccurateeffectivelengthofcolumns，whichmaybringonincorr

6、ectresultssometimesespeciallyforaswayfral"ne．Atthistime，secondorderanalysis’forthewholefrarfleisnecessary．InordertOavoidcomplexanalysis，aapproximatemethodisproposedtocalculateP-Aeffects．Thismethodconsiderstheeffectsofdeflectionbyusingimaginaryhorizontal

7、loadsandimperfectionsaretakenintoaccount．Thistextintroducedthebasictheoriesofthestructuresystemreliability，adoptstheboundcriterionandalgorithmsonthebaseofsystem’Scriticalstrength，．andintroducesthesoftself-adaptationcontrolBoundintotheidentificationofdom

8、inantfailuremodes；atthesametime，withtheincrementalloadmethodanddifferentialequalizedrecursivemethod，computesthelimit-statefunctionoffailuremodeandprobabilityindexpreciselyundernoleakingthedominantfailuremodes．Thistextisturnedthes