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1、第31卷第7期2010年7月011建筑結(jié)構(gòu)學(xué)報JournalofBuildingStructuresVol.31No.7July2010文章編號:1000-6869(2010)07-0086-08鋼結(jié)構(gòu)柱腳抗剪鍵抗剪承載力計算肖南,李莎,趙文爭(浙江大學(xué)建筑工程學(xué)院,浙江杭州310058)摘要:為了確定鋼結(jié)構(gòu)柱腳抗剪鍵的抗剪承載力,分別以混凝土應(yīng)變達(dá)到應(yīng)力峰值應(yīng)變和極限應(yīng)變?yōu)榭辜羟休d力和極限承載力的兩種極限狀態(tài),選取混凝土應(yīng)力-應(yīng)變關(guān)系接近實際受力情況的非線性彈塑性模型,建立了考慮抗剪鍵剪切變形的Timoshenko梁平衡微分方程,采用
2、Galerkin法求得抗剪鍵的變形曲線,進(jìn)而推導(dǎo)了兩種抗剪承載力的理論計算公式,提出了確定抗剪鍵埋深和截面規(guī)格的方法。研究表明:抗剪鍵的抗剪承載力和理論埋深取決于其材料截面特性及基礎(chǔ)混凝土強(qiáng)度。研究同時表明,抗剪鍵埋深范圍內(nèi)混凝土壓力方向不改變,對柱腳底板產(chǎn)生附加彎矩。采用有限元方法對比分析,算例結(jié)果驗證了理論計算公式的正確性。關(guān)鍵詞:鋼柱腳;抗剪鍵;Timoshenko梁;Galerkin法;抗剪承載力中圖分類號:TU391TU312.1TU318.1文獻(xiàn)標(biāo)志碼:ACalculationofshearcapacityofshearconn
3、ectorinsteelcolumnbaseXIAONan,LISha,ZHAOWenzheng(CollegeofCivilEngineeringandArchitecture,ZhejiangUniversity,Hangzhou310058,China)Abstract:Inordertodeterminetheshearcapacityoftheshearconnectorinsteelcolumnbase,twoultimatestatesofconcretecompressivestrainachievingthestraino
4、fpeakstressandtheultimatestraininconcreteconstitutiverelationshipweretakenintoaccountforcalculatingyieldingandultimateshearcapacityoftheshearconnectorrespectively.Thesimplifiednonlinearelasto-plasticconcretestress-strainrelationshipwasadopted.BasedontheTimoshenko-beamtheor
5、yconsideringthesheardeformation,thedifferentialequationsaboutthedeformationcurveoftheshearconnectorwereestablished,andsolvedbyGalerkinmethod.Thetheoreticalformulaeoftheshearcapacitywerededucedandthedesignmethodfortheeffectiveembedmentdepthandsectionoftheshearconnectorwerep
6、roposed.Theresearchshowsthat,theshearcapacityandtheembedmentdeptharedeterminedbythesectioncharacteristicsofshearconnectorandthefoundationconcrete.Italsoindicatesthatanadditionalflexuralmomentisgeneratedbythereactionoftheconcrete.Casestudyshowsthattheshearcapacitiesobtained
7、byFEMandtheproposedmethodinthispaperareaccordantwitheachotherandprovesthevalidityoftheproposedmethod.Keywords:steelcolumnbase;shearconnector;Timoshenkobeam;Galerkinmethod;shearcapacity基金項目:國家自然科學(xué)基金項目(50638050,50978228)。作者簡介:肖南(1965—),男,江西南康人,副教授。E-mail:sholran@zju.edu.cn收稿
8、日期:2008年12月86變εcu為抗剪屈服承載力和極限承載力的兩種極限0引言狀態(tài),選取混凝土應(yīng)力-應(yīng)變關(guān)系更為接近實際受力情況的非線性彈塑性模型,建立了考慮剪切變形的在鋼結(jié)構(gòu)建