混凝土板单元在简单荷载下徐变收缩有限元计算方法的研究

《混凝土板单元在简单荷载下徐变收缩有限元计算方法的研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、同济大学土木工程学院硕士学位论文混凝土板单元在简单荷载下徐变收缩有限元计算方法的研究姓名：荆国强申请学位级别：硕士专业：桥梁与隧道工程指导教师：陈德伟20060601ABSTRA(了rABSTRACTAlongwiththeeconomydevelopment，quiteagreatachievementhasbeenobtainedfortheinfrastructureoftheurbanconstructionandthetransportation．Inordertosatisfytherequirementofincreasingtraffic,massivewidebri

2、dgeshavebeenbuiltinmanymetropolisesandonalotofimportantexpressways．Andmanywidebridgesarebeingortobebuilt．Intheconstructionprocessesoftheseconcretebridges，especiallyofcable—stayedbridges，longitudinalcracksonthebridgedeckfrequentlygenerate，whichseldomocolrtothenarrowbridges．Thereasonforthisproble

3、misvariousandcomplex．Buttwoofthesereasonsare．"thespatialeffectisverystrongtowidebridges；concrete’Sshrinkandcreepeffect；moreover,itenhancesandcomplicatesthespatialeffect．。Atpresent，thesoftwareforbridgedesigngenerallyadoptstwodimensionedbeamfinitemethod．Anditprovestobeeffectiveforcommonstructurea

4、nalysis，internalforcecalculationanddesigncheck．Butitisbeyonditsabilitytoanalyzethespatialeffectofwidebridgethatmentionedabove．ItCaR’treflectthestructure’Sstateprecisely,andsometimemaycomeoutfalseconclusion．Soitistobeaproblemforthedesign，constructionandmonitoringofbridges．Inviewofthefactthatment

5、ionedabove，aprogramforplanefiniteelementisdesignedtoanalyzethestressbehaviorofplaneunderspatialloads．Andthefiniteelementmethodforcalculatingconcrete'sshrinkandcreepundersimpleloadsisstudied．Itishopedtoprovidecalculatingbasisforsolvingtheproblemandtomaketheanalysiseasierthangeneralsoftware，which

6、iscomplextodefinethestructure，easytomakeamistakeandtakesmuchtimetoinputthedata,difficulttosimulatethebridgestatestepbystepwhenitisbeingbuiltoroperating．Inthisdissertationthebasicfundamentaloffiniteelementanalysisisfirstexplained．Theprogramisdesignedbasedontheelementtypeandnumericalanalysismetho

7、d，whichisdeterminedbythebasicfundamental．Thenthemethodofcalculatingshrinkandcreepofconcreteisdiscussed．Andthecalculationisimplementedintheprogram，inwitchthemethodofcalculatingshrinkstrainandcreepcoefficientisadoptedfromthe“Codefor