現(xiàn)澆混凝土板類構(gòu)件的裂縫控制.pdf

1、同濟(jì)大學(xué)土木工程學(xué)院碩士學(xué)位論文現(xiàn)澆混凝土板類構(gòu)件的裂縫控制姓名：李超申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：顧祥林林峰20080501AbstractABSTRACTCracksfrequentlyoccureitheronthesurfaceorthroughthedepthinconcreteslabmemberscastinsituThesecracksmayacceleratecorrosionoftheembeddedre

2、inforcingsteelsandleadtodeteriorationoftheserviceabilityofconcretestructuresSincethecosttepairthecracksinconcreteisverylarge，itissignificanttocontrolthecracksinconcretestructuresCrackingofconcreteisacomplexprocessclosely

3、relatedtomaterialpropertiesatearlyagesTherefore，experimentalstudyonmechanicalandphysicalpropertiesofconcretewithfourmixtureproportionsatdifferentageswasperformed，focusingonsplittensilestrength，elasticmodulus，uniaxialstre

4、ss—strainrelationshipofconcreteundercompression，concretefreeshrinkage，creepundercompressionandhydrationheatofcementTheconcreteageswerefromtwodaystohalfayearAsresults，thetimedependentlawsofconcretematerialpropertieswereob

5、tainedBasedonthestudyresultsofmaterialproperties，experimentalresearchandnumericalsimulationforthecontrolofcrackinginconcreteslabswereconductedSixteenreinforcedconcreteslabswithcontroljointsandothertwowithoutjointswerecas

6、tinpre—formedsteelmouldstostudytheeffectivenessofcontroljointsVariedparametersincludedconcretemixtureproportion，reinforcementratio，jointslocationandtype(thejointdepthwas1／3oftheslabthicknessorthroughthedepth)Crackanddefo

7、rmationdevelopmentwererecordeduptoaboutninemonthsBasedonthetimedependentlawsofmaterialproperties，numericalsimulationsfortheeighteenslabswereperformedtoinvestigatethetime—dependentlawofcrackinganddeformationItwasshownthat

8、controljointsinconcreteslabsareabletomakecrackingoccurinthepreselectedlocationstoacertainextentHowever，therewerecracksatthejointends，whereshouldbestrengthenedintheconstructionAsacasestudy，testonthecontrolofcrackinginShan

9、ghaiLightSourceProjectwasperformedA1／4scalemodelwasmadetostudydevelopmentofcracksanddeformationDuringthetestperiod，deformationofconcreteandsteelbarswasmeasuredbymicrometerandstraingaugesrespectivelyMeanwhile，crackswerede