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1、摘要預(yù)應(yīng)力混凝土梁式橋在我國橋梁建筑上占我重要的地位,在目前,對于中小跨徑的永久性橋梁,無論是公路橋梁或者城市橋梁,都在盡量采用預(yù)應(yīng)力混凝土梁式橋,因為這種橋梁具有就地取材,工業(yè)化施工,耐久性好,適應(yīng)性強(qiáng),。整體性好以及美觀等多種優(yōu)點。本設(shè)計采用裝配式簡支T梁結(jié)構(gòu),其上部結(jié)構(gòu)由主梁、橫隔梁、行車道板,橋面部分和支座等組成,顯然主梁是橋梁的主要承重構(gòu)件。其主梁通過橫梁和行車道板連接成為整體,使車輛荷載在各主梁之間有良好的橫向分布。橋面部分包括橋面鋪裝、伸縮裝置和欄桿等組成,這些構(gòu)造雖然不是橋梁的主要承重構(gòu)件,但它們的設(shè)計與施工直接關(guān)系到橋梁整
2、體的功能與安全,這里在本設(shè)計中也給予了詳細(xì)的說明。本設(shè)計主要受跨中正彎矩的控制,當(dāng)跨徑增大時,跨中由恒載和活載產(chǎn)生的彎矩將急劇增加,是材料的強(qiáng)度大部分為結(jié)構(gòu)重力所消耗,因而限制的起跨越能力,本設(shè)計采用27m標(biāo)準(zhǔn)跨徑,合理地解決了這一問題。在設(shè)計中通過主梁內(nèi)力計算、應(yīng)力鋼筋的布置、主梁截面強(qiáng)度與應(yīng)力驗算、行車道板及支座、墩臺等等設(shè)計,完美地構(gòu)造了一座裝配式預(yù)應(yīng)力混凝土簡支T梁橋,所驗算完全符合要求,所用方法均與新規(guī)范相對應(yīng)。本設(shè)計重點突出了預(yù)應(yīng)力在橋梁中的應(yīng)用,這也正體現(xiàn)了我國橋梁的發(fā)展趨勢。關(guān)鍵詞:預(yù)應(yīng)力,簡支T梁,后張法,應(yīng)力驗算Abst
3、ractTheprestressedconcretebeamplatebridgeoccupiesmyimportantstatusinourcountrybridgeconstruction,inatpresent,regardingsmallspanpermanentbridge,regardlessofisthehighwaybridgeorthecitybridge,allasfaraspossibleisusingtheprestressedconcretebeamplatebridge,becausethiskindofbrid
4、gehasmakesuseoflocalmaterials,theindustrializationconstruction,thedurabilityisgood,compatible,integritygoodaswellasartisticandsoonmanykindsofmerits.ThisdesignusesassemblytypesimplesupportTbeamstructure,itssuperstructurebythekingpost,septumtransversumbeam,thelaneboard,thebr
5、idgefloorpartandthesupportandsooniscomposed,theobviouskingpostisthebridgemaincarrier.Itskingpostconnectsintothewholethroughthecrossbeamandthelaneboard,enablethevehiclesloadtohavethegoodtraversebetweenvariouskingposts.Bridgefloorpartincludingcompositionsandsoonflooring,expa
6、nsionandcontractioninstallmentandparapet,thesestructuresalthoughisnotthebridgemaincarrier,buttheirdesignandtheconstructionrelatesthebridgewholedirectlythefunctionandthesecurity,herehasalsogiventhedetailedexplanationinthisdesign.Thisdesignmainlystepsthesaggingmomentcontrol,
7、whenthespanincreases,crossthebendingmomentwhichproducesbythedeadloadandtheliveloadthesharpgrowth,isthematerialintensitymajorityofconsumesforthestructuregravity,thuslimitsthespanningability,thisdesignusesthe27mstandardspan,hassolvedthisproblemreasonably.Inthedesignthroughth
8、ekingpostendogenicforcecomputation,thestresssteelbararrangement,kingpostsectionintensitya