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1、预应力混凝土T型梁式桥设计.摘要预应力混凝土梁式桥在我国桥梁建筑上占有重要的地位,在目前,对于中小跨径的永久性桥梁,无论是公路桥梁或者城市桥梁,都在尽量采用预应力混凝土梁式桥,因为这种桥梁具有就地取材,工业化施工,耐久性好,适应性强。整体性好以及美观等多种优点。本设计采用简支T梁结构,其上部结构由主梁、横隔梁、行车道板和桥面部分等组成,显然主梁是桥梁的主要承重构件。其主梁通过横梁和行车道板连接成为整体,使车辆荷载在各主梁之间有良好的横向分布。桥面部分包括桥面铺装、伸缩装置和栏杆等组成,这些构造虽然不是桥梁的主要承重构件,但它们的设计与施工直接关系到桥梁整
2、体的功能与安全,这里在本设计中也给予了详细的说明。本设计主要受跨中正弯矩的控制,当跨径增大时,跨中由恒载和活载产生的弯矩将急剧增加,是材料的强度大部分为结构重力所消耗,因而限制的起跨越能力,本设计采用20m标准跨径,合理地解决了这一问题。在设计中通过主梁内力计算、应力钢筋的布置、主梁截面强度与应力验算、行车道板等设计,完美地构造了一座预应力混凝土简支T梁桥,所验算完全符合要求,所用方法均与新规范相对应。本设计重点突出了预应力在桥梁中的应用,这也正体现了我国桥梁的发展趋势。关键词.预应力混凝土;简支T梁;后张法施工Designof20mhighwaypre
3、stressedconcretesimplesupportedT-beambridgeAutour:Wangweiningtutor:LileiAbstractTheprestressedconcretebeamplatebridgeoccupiesmyimportantstatusinourcountrybridgeconstruction,inatpresent,regardingsmallspanpermanentbridge,regardlessofisthehighwaybridgeorthecitybridge,allasfaraspossi
4、bleisusingtheprestressedconcretebeamplatebridge,becausethiskindofbridgehasmakesuseoflocalmaterials,theindustrializationconstruction,thedurabilityisgood,compatible,integritygoodaswellasartisticandsoonmanykindsofmerits.ThisdesignusessimplesupportTbeamstructure,itssuperstructurebyth
5、ekingpost,septumtransversumbeam,thelaneboardandthebridgefloorpartandsooniscomposed,theobviouskingpostisthebridgemaincarrier.Itskingpostconnectsintothewholethroughthecrossbeamandthelaneboard,enablethevehiclesloadtohavethegoodtraversebetweenvariouskingposts.Bridgefloorpartincluding
6、compositionsandsoonflooring,expansionandcontractioninstallmentandparapet,thesestructuresalthoughisnotthebridgemaincarrier,buttheirdesignandtheconstructionrelatesthebridgewholedirectlythefunctionandthesecurity,herehasalsogiventhedetailedexplanationinthisdesign.Thisdesignmainlystep
7、sthesaggingmomentcontrol,whenthespanincreases,crossthebendingmomentwhichproducesbythedeadloadandtheliveloadthesharpgrowth,isthematerialintensitymajorityofconsumesforthestructuregravity,thuslimitsthespanningability,thisdesignusesthe20mstandardspan,hassolvedthisproblemreasonably.In
8、thedesignthroughthekingpostendogenicforc