预应力砼简支梁桥设计.doc

[预应力砼简支梁桥设计——一级公路桥梁，跨径30m]摘要本次设计的题目是预应力混凝土T型梁桥的设计。本设计采用预应力混凝土T型梁桥，跨径布置为（3×30）m，主梁为变截面T型梁。跨中梁高为1.80m，支点梁高为1.80m。桥墩为重力式桥墩、桥台。本文主要阐述了该桥的设计和计算过程。首先对主桥进行总体结构设计，然后对上部结构进行内力、配筋计算，再进行强度、应力及变形验算，最后进行下部结构验算。具体包括以下几个部分：1.桥型布置，结构各部分尺寸拟定；2.选取计算结构简图；3.恒载内力计算；4.活载内力计算；5.荷载组合；6.配筋计算；7.预应力损失计算；8.截面强度验算；9.截面应力及变形验算；10.下部结构验算。关键词预应力混凝土，T型简支梁桥，桥墩，桥台ABSTRACTThisdesignisofthesamesectionPrestressedConcretet-shapedsupportedbeambridgedesign.Thebridgebelongstotheprestressedconcretedstructuerwhichisasimplesupportedbeambridge.Thespanarrangementis（3×30）m.ThesuperstructureisvariableTshapedsupportedbeambridge.Theheightofthegirderonthesupportis1.80m,andtheheightofthemiddleis1.80mtoo.Thepierisgravitypier.Theabutmentisgravityabutment.Thisessayfocusesonthedesignandcalculationprocessofthebridge.Firstly,makeanoverallstructuredesignofthemainspan.Secondlyperformthecalculationoftheinternalforceandreinforcingbaronthesuperstructure.Thirdly,checktheintensity,stressanddeflection.Finally,checkthesubstructure..Themainpointsofthedesignareasthefollows.1.Thearrangementofthebridgetypes;2.Theunitspartitionofthestructute;3.Thecalculationoftheinternalforceofdeadload;4.Thecalculationoftheinternalforceofmovableload;5.Thecombinationofeverykindofload;6.Thearrangementofprestressedreinforcingbar;7.Thecalculationoftheprestressedloss;8.Thecheckofthesectionintensity;9.Thecheckofthesectionstressanddeflection;10.Thecheckthesubstructure.KeywordsPrestressedconctete，Tshapedsupportedbeambridge，pier，abutment目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc200439848"摘要PAGEREF_Toc200439848\hIHYPERLINK\l"_Toc200439849"ABSTRACTPAGEREF_Toc200439849\hIIHYPERLINK\l"_Toc200439850"1上部结构计算PAGEREF_Toc200439850\h1HYPERLINK\l"_Toc200439851"1.1设计资料及构造布置PAGEREF_Toc200439851\h1HYPERLINK\l"_Toc200439852"1.1.1设计资料PAGEREF_Toc200439852\h1HYPERLINK\l"_Toc200439853"1.1.2横截面布置PAGEREF_Toc200439853\h2HYPERLINK\l"_Toc200439854"1.1.3截面沿跨长的变化PAGEREF_Toc200439854\h5HYPERLINK\l"_Toc200439855"1.1.4横隔梁的设置PAGEREF_Toc200439855\h5HY