桥梁毕业论文预应力混凝土简支T型梁设计.doc

摘要
本设计是根据设计任务书的要求和《公路桥规》中的相关规定,对一座中型桥梁的方案比选和设计。对该桥的设计,本着“安全,经济,美观,实用”的原则,提出了两种不同的桥型方案。方案一为预应力混凝土简支梁桥;方案二为梁拱组合桥,经由以上的原则及从设计施工等多方面考虑。确定第一方案为推荐方案。
在本设计中,桥梁上部结构采用预应力混凝土简支T型梁,桥梁全长90米,主梁标准跨径30m,采用预应力钢筋混凝土后张法进行设计,xm锚具施工。计算各根主梁跨中和支点处的荷载横向分布系数时,跨中采用G-m法,支座处采用杠杆原理法,并通过分析梁的最不利荷载横向分布求得桥梁的剪力和弯矩设计值,并以此来进行主梁的预制和预应力钢束配筋和强度验算。横隔梁采用偏心压力法来计算其内力,在本设计中仅求出了最不利荷载的跨中横隔梁的控制内力,其它横隔梁以此为依据估算设计。桥梁的支座采用板式橡胶支座,再本设计中的全部图纸均采用计算机辅助设计绘制。
关键词:预应力混凝土;简支梁桥;荷载横向分布系数;横隔梁;上部结构。
Abstract
This is a medium-sized bridges of scheme selected and design,according to designing assignment and the standard of the road and bridge. For the purpose of make the type of the bridge corresponding with the ambience andcost saving, this paper provides two different types of bridge, the second is bination bridge girder and arch; after par:sons of economy, appearance, characteristic lunder thestrength and effect,the first one is selected.
In this design,the bridges super structure adopts t beam,reinfrced concrete pretressed support-beam bridge bridge. The bridge is 90 m long,whose standard span is 30m. Main beam adopts prestresssing force reinforced concrete posttensioning methed to design, xm archange to construct. I use the g-m method to caculate the horizon tol distribute paramenter of the middle span of the beam,using balance method to caculate the horizen td distribute parameter. Shear and bending moment is obtmined by inside force account;using horizontal distribute parameter and the bridges most disadvantageous benelux carries. In this way main beam made,prestressing force reinforceds account and strenth checking canbe carrtied on, seat adopts rubber benring. All of the sdrawings were protracted by Auto CAD.
Key words:prestressed concrete, simple supported beam bridge,horizonted distribute paranmeter, cross girder, super structure.
目录
摘要 I
Abstract II
前言 I
1 桥型方案比选 1
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2 桥梁的设计资料及构造布置 5
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