《簡(jiǎn)支轉(zhuǎn)連續(xù)箱梁》word版

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1、摘要預(yù)應(yīng)力混凝土連續(xù)箱梁橋結(jié)構(gòu)剛度大，動(dòng)力性能好，主梁變形撓曲線平緩，有利于高速行車，連續(xù)梁在活載作用下，因主梁連續(xù)產(chǎn)生支點(diǎn)負(fù)彎矩，對(duì)跨中正彎矩有卸載作用，其彎矩分布較合理。目前在公路橋梁工程中應(yīng)用非常廣泛。本設(shè)計(jì)主梁就選用了預(yù)應(yīng)力混凝土連續(xù)箱梁，完成了營(yíng)雙高速公路馬跑溝河大橋4×30m連續(xù)箱梁橋的設(shè)計(jì)。大橋正跨馬跑溝河，為“U”字形河谷，工程地質(zhì)分區(qū)屬于沖洪積平原地址區(qū)，橋址位于管子溝河道及兩岸，河道兩岸地勢(shì)較為開(kāi)闊。在本次設(shè)計(jì)中，首先進(jìn)行了橋址資料和設(shè)計(jì)標(biāo)準(zhǔn)的闡述，然后確定了預(yù)應(yīng)力混凝土連續(xù)箱

2、梁橋?yàn)楸驹O(shè)計(jì)采用的方案，就其進(jìn)行了結(jié)構(gòu)設(shè)計(jì)，設(shè)計(jì)的主要內(nèi)容有：擬定截面尺寸；計(jì)算控制截面的設(shè)計(jì)內(nèi)力及其相應(yīng)的組合值；估算預(yù)應(yīng)力鋼筋的數(shù)量并對(duì)其進(jìn)行布置，邊跨采用42根15.2的預(yù)應(yīng)力鋼絞線，N1每束6根，N2、N3、N4每束5根。在中跨跨中采用38根鋼絞線，N1、N2、N3每束5根，N4每束4根；計(jì)算主梁截面的幾何特征值；承載能力極限狀態(tài)驗(yàn)算和正常使用極限狀態(tài)驗(yàn)算；正常使用極限狀態(tài)下構(gòu)件抗裂性及變形驗(yàn)算；持久狀態(tài)下和短暫狀態(tài)下構(gòu)件截面應(yīng)力驗(yàn)算。經(jīng)檢算，設(shè)計(jì)的橋梁結(jié)構(gòu)安全，合理，并滿足現(xiàn)行規(guī)范的要求

3、。關(guān)鍵詞：預(yù)應(yīng)力、連續(xù)箱梁、方案比選AbstractPrestressedconcretecontinuousboxgirderbridgestructurestiffness,gooddynamicperformance,deformationofmaingirderdeflectioncurveisgentle,highspeeddriving,continuousbeambridgeunderliveload,becausethegirdercontinuousgenerationofneg

4、ativebendingmomentofthesupportingpoint,thespanisbendingmomentunloadingeffect,andthebendingmomentdistributionmorereasonable.Atpresent,intheroadandBridgeEngineeringinawiderangeofapplications.Thedesignofmaingirderwithprestressedconcretecontinuousboxgirde

5、r,completedthedesignof4×30mcontinuousboxbeambridgeovertheMapaogouriverfromtheYingShuangfreeway.ThebridgeistomounttheMapaogouriver,"U"shapedValley,engineeringgeologicalzoningbelongstothealluvialplainofaddressarea,bridgeislocatedatRiverandcrosspipeditch

6、,rivermoreopenterrain.Inthisdesign,thefirstsuchmaterialanddesignstandardpaper,andthendeterminedtheprestressedconcretecontinuousboxgirderbridgeforthisdesignUSESthescheme,thestructuredesign,thedesignofthemaincontent:formulationofsectionsizecalculationco

7、ntrolsection;theforceanditscombinationvalue;estimationofprestressedreinforcementquantityanditslayout,sidespanwith42rootdiameter15.2prestressedsteelstrand,N1eachbundleof6root,N2,N3,N4eachbundleof5root.Inthespanof38steelstrand,N1,N2,N3eachbeam5,N4eachbu

8、ndleof4root;calculationofgirdersectiongeometriccharacteristicvalue;normalsectionandinclinedsectionbearingcapacitychecking;normallimitconditionofcrackresistanceanddeformationcalculation;persistentstateandtransientstateunderthesectionstresscalcu