探究一种半刚性连接节点的疲劳性能分析

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1、合肥工业大学硕士学位论文一种半刚性连接节点的疲劳性能分析姓名：陈剑波申请学位级别：硕士专业：结构工程指导教师：完海鹰;张伟林20050501一种半剐性连接钢框架节点的疲劳性熊分拆摘要i9§莲霉豹美国数l§羚建震霸l∞5蔽毒拳趣震表饔了，程强建震嚣鲻下撬弯钢框架的烊接粱柱节点处出现了一系列意想不利的脆性破坏。这个事实引起了人们对焊接抗弯节点这种不良性能怒因的关注。到目前为此，人们已经进行了广泛的试验来改进节点瓣性能。蔼激的抗震节点斑能够减少爆接的脆蚀破坏和缓解翼缘麓豹过赢应力集中，这常裙要求要改变节点戆细郝掏

2、造。大多数静薪型节点都瑟求设计成具有能够把塑雠铰出柱翼缘转移到梁翼缘上来的性能，所以节点采用了盖板和鬓盥肋，或者肖0弱肋粱翼缘的强度(及所谓的狗骨)的螺捡连接节焱。她终，燃栓节点不仅仅麓够在孛低震区健骜辫接节点，程凑震区也同样可议。事实上，踟于螺检其裔分布式豹绥桶特性，使箕产生了多余麴抗震耗能防线．成为了螺梭趣好抗震性能的关键所猩。总之，嬲受到中震或强震时，半刚性连接比究全剐性连接更快的进入非弹毪，困魏考逮宅瓣耗麓辘力÷分羹蘩。在建囊穗瑟振凌露，连接豹耗魏缝力取决于抵抗低周疲劳的熊力。本文使厢ANsYs／F

3、atigue软件进行了常幅偏移下的性能分析，来获取结构的疲劳寿命使用系数。关键谴；拳剐经连接，预底角锈连搂，{氛蠲疲劳，鎏注转动能力，菲弹往Analysisoffatiguebehaviorofacertainsemi-rigidjointABSTRACTTheearthquakesofNorthridge(1994)andHyogoken-Nanbu(1995)revealedaseriesofundesirablebrittlefailuremodesinweldedbeam．to．columnconn

4、ections．whichunderminedthehighseismicperformanceofsteelmoment-resistingframes．ThisfactgeneratedconcerninthescientinccommunityforthecausesoftheunexpectedpOorbehavjourofweJdedbeam—to-co】umnmomentconnections．Extensivelaboratorystudieshavebeencar“edoutinordert

5、odevelopimprovedconnecliondetailsandmethodologies．Ithasbeenshownthatnewdesign0fearthquakeresistantconnectionsshouldincorporatebothweldfracturem“igationmeasuresandnangeoVerstressmitigationmeasures，thatusuallycomprisechangesinconnectionconnguration．Mostofthe

6、newconnectiontypologiesaredesignedsoastoshifttheplastichingeawayfromthecolumnnangebyreinforcingtheconnectionwithcoVerplatesandVerticalribs，orbyweakeningthebeamflangeneartheconnection(thesocalled“dog—bone”)．Ontheotherhand，boltedconnectionsareconsideredasana

7、lternatiVetotheweIdedconnectionsnotonIyfbrareasoflowtomoderateseismicity，butaIsoforhighseismiczones．BoltedconnectionshaveproVjdedVefygoodperfbfmancehjstorjca¨y，andtheirdistributedcharacteristicsleadtoredundantandtoughstructuralsystems，whicharethekeyforagoo

8、dseismicper如rmance．Inaword，sincesemi一“gidconnections，whensubjectedtomoderateorstrongeanhquakes，becomeinelasticmorequicklythantheirfullyrigidcounterparts，considerationoftheirenergyabsorptioncapacityisimportant