資源描述:
《基于k型偏心支撐鋼框架的結(jié)構(gòu)影響系數(shù)》由會員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、蘇州科技學(xué)院碩士學(xué)位論文K型偏心支撐鋼框架的結(jié)構(gòu)影響系數(shù)姓名:王二標(biāo)申請學(xué)位級別:碩士專業(yè):結(jié)構(gòu)工程指導(dǎo)教師:顧強(qiáng)20070501蘇州科技學(xué)院碩t學(xué)位論文摘要鋼材作為結(jié)構(gòu)材料,與混凝土、砌體相比具有良好的延性.只要采取合理的結(jié)構(gòu)體系和節(jié)點形式,在強(qiáng)震作用下鋼結(jié)構(gòu)進(jìn)入彈塑性后其優(yōu)越的延性和耗能能力就會顯現(xiàn)出來,所受到的地震作用與延性較差的結(jié)構(gòu)(如混凝土、砌體結(jié)構(gòu))相比理應(yīng)要小。我國現(xiàn)行抗震設(shè)計規(guī)范GB50011-2001對結(jié)構(gòu)地震作用的取值不區(qū)分結(jié)構(gòu)材料和結(jié)構(gòu)類型,對建筑物采用單一的結(jié)構(gòu)影響系數(shù)(2.8125),取相同的地震作用,不盡合理,由此導(dǎo)致鋼結(jié)構(gòu)的設(shè)
2、計地震作用取值偏大,與國外抗震規(guī)范相比拉開了差距。本文以層數(shù)、跨數(shù)、跨度三個參數(shù)為變量選取了12個K型偏心支撐鋼框架,按照現(xiàn)行規(guī)范進(jìn)行結(jié)構(gòu)設(shè)計,然后采用Pushover法分別求解其結(jié)構(gòu)影響系數(shù)、并對結(jié)果進(jìn)行了分析統(tǒng)計.文中列舉了一個典型算例,詳細(xì)論述了求解結(jié)構(gòu)影響系數(shù)的具體步驟。通過對12個算例的統(tǒng)計分析發(fā)現(xiàn),現(xiàn)行抗震設(shè)計規(guī)范GB50011.2001對K型偏心支撐鋼框架的設(shè)計地震作用取值偏大,建議對其進(jìn)行折減,本文通過算例的分析得出折減系數(shù)可取O.8。另外本文還分析了結(jié)構(gòu)層數(shù)、跨數(shù)、跨度對結(jié)構(gòu)影響系數(shù)、延性系數(shù)、超強(qiáng)系數(shù)以及位移放大系數(shù)的影響規(guī)律。關(guān)鍵詞:
3、鋼結(jié)構(gòu)地震作用,K型偏心支撐鋼框架,結(jié)構(gòu)影響系數(shù),Pushover分析AbstractAsakindofstructurematerial,thesteelhasnicerd1】clili夠comp齟cdwithc蛐creteandbrick.Aslongastherightstructuresystemandthepropernodestyle批selected,thesteelslllMm珊appearsexcellentductilityandenergy-dissipationability,whenitgetsintoelastic-plasti
4、cstateunderstrongearthqake.Forthatreason,thedesign-valueofearthquakeactionofthesteelstructureshouldbelowerthanthatoftheconcreteorbrickstructure.Comparedwithmanyabroadcodesforseismicdesign,codeforSeismicDesignofBuildings(GB50011-2001)takesthe戤血edesignvalueofearthquakeactionandthe磷l
5、nlcvalueofRcoefficient陀.8125)withouttakingaccotmtofthed渤-ellce5ofthestructuralsystems,whichisunreasonableandc卸鯔thehig:b盯design-valueforthesteelstructme.Inthisp;Iper’12eccenUicallyK-bracedsteelflBme$(inchldingdifferentstorynumbers.differentspannumbersanddifferentspan)躺analyzedtOget
6、thevalueofstructuralinfluencingcoefficientofeachexample,byPushovermethod.AtypicalecccentricallyK-bracedsteelframeisgiventointroducethedetailedstepstode把們minetheproperRvalue.Accordingtotheanalysisof12-eccentricatlyK-bracedsteelfl-ame$,theresultindicatesthattheearthquakeactiondesign
7、valueofeccentricallyK-braceds;teelfl-amewhichisdesignedaccordiIlgIotheCode(GB50011-2001)ishigherthanthevalueitreallybears.ItissuggestedtoreducethedesignvalueofearthquakeactiOlLMoreover,basingOiltheanalysisof12examplesanddataprocessingvariationregularitiesofstructuralcoefficient,du
8、ctilitycoefficient,over-strengthc