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1、第44卷第11期土木工程學(xué)報(bào)Vol_442011年11月CHINACIVILENGINEERINGJOURNALNOV.地基不均勻沉降對(duì)框架結(jié)構(gòu)影響的試驗(yàn)研究賈強(qiáng)程林林張?chǎng)?1.【II東建筑大學(xué),山東濟(jì)南250013;2.山東省建筑結(jié)構(gòu)鑒定加固與改造再點(diǎn)實(shí)驗(yàn)室,山東濟(jì)南250013)摘要:地基不均勻沉降會(huì)引起框架結(jié)構(gòu)產(chǎn)生附加內(nèi)力,造成構(gòu)件開(kāi)裂甚至破壞。通過(guò)3跨框架結(jié)構(gòu)的模型試驗(yàn),研究框架結(jié)構(gòu)在邊柱沉降和巾柱沉降兩種工況下構(gòu)件的開(kāi)裂和破壞規(guī)律,提出地基不均勻沉降的限值。在邊柱沉降的試驗(yàn)中,裂縫主要出現(xiàn)在邊柱梁柱節(jié)點(diǎn)腋部、中柱梁柱節(jié)點(diǎn)頂部和中跨梁跨中頂部等部位
2、,最終以邊柱梁柱節(jié)點(diǎn)處裂縫貫通標(biāo)志著構(gòu)件的破壞。梁的轉(zhuǎn)角正切達(dá)到1/250時(shí),開(kāi)始出現(xiàn)裂縫;梁的轉(zhuǎn)角正切達(dá)到1/50時(shí),構(gòu)件達(dá)到承載力極限狀態(tài)。中柱沉降的試驗(yàn)中,裂縫主要出現(xiàn)在邊跨梁靠近邊柱端上部、中跨梁跨中下部和中跨梁靠近節(jié)點(diǎn)端下部等,最終以中跨梁上部混凝土壓酥標(biāo)志著構(gòu)件的破壞。梁的轉(zhuǎn)角正切達(dá)到1/1250時(shí),開(kāi)始出現(xiàn)裂縫;梁的轉(zhuǎn)角切達(dá)到1/40時(shí),構(gòu)件達(dá)到承載力極限狀態(tài),試驗(yàn)結(jié)果與數(shù)值分析結(jié)果相吻合。關(guān)鍵詞:框架結(jié)構(gòu);不均勻沉降;試驗(yàn)研究;附加內(nèi)力中圖分類號(hào):TU375.4FU434文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000—131X(20l1)11-0079-
3、08ExperimentalstudyoftheinfluenceofdiferentialsettlementonRCframestructuresJ/aQiangChengLinlinZhangXin(1.ShandongJianzhuUniversity,Jinan250013,China;2.ShandongProvincialKeyLabofAppraisalandRetrofittinginBuildingStructures,Jinan250013,China)Abstract:AdditionalinternalforcesO±RCflam
4、estructuresmaybeinducedbyfoundationdifierentialsettlement,whichmayresultinfailureofRCmembers.ThecrackanddamageofRCmembersunderlateralcolumnsett]ementandmiddlecolumnsettlementwerestudiedthroughamodelexperimentofathree—spanframestructure.Alimitvalueoffoundationdifferentialsettlement
5、wasproposed.Forlateralcolumnsettlement,themaincracksappearedattheunderarmpansofbeam—columnjoints,thetopofbeam—columnjointsofmiddlecolumns,andthetopofmiddlespanofmiddlebeams.TheRCmembersfailedduetopropagationofcracksofthebeam—columnjointsofsidecolumns.Thecracksappearedwhenthetangen
6、tvalueofbeamrotationanglereached1/250,andthebearingcapacitylimitstatewasreachedwhenthetangentvalueofbeamrotationanglereached1/50.Astomiddlecolumnsettlement,themaincracksappearedatthetopofsidecolumnsnearbythecorrespondingsidebeams,thebottomofmiddlespanofmiddlebeams,andthebottomofjo
7、intpartofmiddlespanbeams.TheRCmemberswerebrokenforthetopconcretecompressionfailureofmiddlespanbeams.Thecracksappearedwhenthetangentvalueofbeamrotationanglereached1/1250,andbearingcapacitylimitstatewasreachedwhenthetangentvalueofbeamrotationanglereached1/40.Theexperimentalresultswe
8、reshowntobeinreasonableagreementw