資源描述：
《現(xiàn)澆混凝土樓板裂縫分析》由會(huì)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(kù)。
1、摘要住宅現(xiàn)澆樓板的裂縫是一種常見的建筑質(zhì)量問(wèn)題，對(duì)現(xiàn)澆混凝土樓板裂縫的成因進(jìn)行深入的理論分析，并提出設(shè)計(jì)、施工預(yù)防措施，具有巨大的社會(huì)效益和經(jīng)濟(jì)效益。在施工階段，樓板的混凝土強(qiáng)度較低，承擔(dān)較大的施工荷載，可能導(dǎo)致混凝土的微裂縫損傷，較大的收縮可引起裂縫貫通。本文試圖建立混凝土的抗彎能力時(shí)變關(guān)系和施工荷載的時(shí)變關(guān)系，對(duì)施工階段混凝土樓板開裂的可能性進(jìn)行分析。首先通過(guò)對(duì)低齡期混凝土的抗壓試驗(yàn)和拉拔試驗(yàn)研究，獲得了低齡期混凝土抗壓強(qiáng)度和粘結(jié)強(qiáng)度隨齡期的發(fā)展變化規(guī)律，為施工期混凝土樓板的抗力分析提供了理論依據(jù)。然后采用時(shí)變結(jié)構(gòu)簡(jiǎn)化分析模型，計(jì)算出施工期混凝土樓板在一
2、個(gè)施工循環(huán)內(nèi)承擔(dān)的施工荷載，通過(guò)對(duì)施工期樓板的抗力和承擔(dān)的施工荷載隨齡期變化的對(duì)比，分析了現(xiàn)澆樓板裂縫的成因，并探討了不同施工因素對(duì)樓板開裂的影響。最后以某磚混結(jié)構(gòu)住宅現(xiàn)澆樓板的裂縫為例，計(jì)算出樓板施工期的施工荷載和開裂彎矩時(shí)程，分析了其開裂的原因，并提出相應(yīng)的預(yù)防措施?；谝陨系难芯浚疚奶岢霈F(xiàn)澆樓板裂縫成因的一種觀點(diǎn)：由于施工期樓板的強(qiáng)度較低，抗裂能力差，在施工荷載的作用下樓板產(chǎn)生了微裂縫損傷，后期混凝土的收縮導(dǎo)致裂縫進(jìn)一步發(fā)展，直至貫穿樓板。關(guān)鍵詞：現(xiàn)澆樓板，裂縫，施工荷載，抗力，時(shí)變結(jié)構(gòu)AbstractABSTRACTCrackincast··in·
3、·placereinforcedconcretefloorsisacommonproblemofbuildingquality．Inthepapef，causesofcracksincast··in··placereinforcedconcretefloorsaretheoreticallyanalyzed，anddesignandpreventivemeasuresareproposed，whichhavesignificantsocialandeconomicbenefits．●Intheconstruction，theconcretestrengtho
4、freinforcedconcretefloorsisquitelow,butthefloorsassumeconsiderableconstructionload,whichmayresultinsmallcracksinconcrete．1nheshrinkagecanhelpthecracksrunthough．netime·varyingrelationofbendingbearingcapacityandthatofconstructionloadareestablished,andthecrackprobabilityofreinforcedco
5、ncretefloorsintheconstructionisanalyzedFirstly，throughthestudyonthepressuretestandpull-outtestonearly—agedconcrete，therulethatthecompressivestrengthandbondstrengthvarywiththeageofconcreteissummarized，whichcanservetopresenttheoriesfortheresistanceanalysisofreinforcedconcretefloorsin
6、theconstruction．Secondly,theanalysismodelsaresimplifiedusingtime—varying(time·dependent)structures，andtheconstructionloadassumedbyreinforcedconcretefloorsinoneconstructioncircleiscalculated．Comparingthevariationofresistanceandconstructionloadofreinforcedconcretefloorsastheagechange
7、s，caUSeSofcracksincast—in-placereinforcedconcretefloorsareanalyzedandinfluenceofdifferentconstructionfactorshaveonthecrackisdiscussed．Finally,cracksincast-in—placereinforcedconcretefloorsofonemasonrystructurearetakenasexample，constructionloadandcrackmomenthistoryintheconstructionar
8、ecalculated,causesofcracks
