文档介绍：摘要
随着时代的发展,交通建设逐渐成为地区经济发展的关键,而桥梁建设显得尤为突出。本文就一座T型简支梁的预应力混凝土桥梁为设计目的,从而探讨桥梁设计方面的一些知识与内容。
本文主要设计**至**,由三跨组成,,单幅路宽为12米,两面设人行道。;设计荷载为公路-I级。
其中,桥梁上部结构设计包括结构尺寸的拟定,主梁设计,桥面板设计,横隔梁以及支座设计。主梁选定为预应力混凝土T型梁,混凝土采用C50,预应力钢束采用标准强度为1860Mpa的高强度钢绞线,支座则选用钢筋混凝土摆动式支座。
主梁设计的主要内容有:荷载计算、荷载横向分布计算、内力影响线绘制;内力计算包括恒载内力、活载内力等;内力组合包括承载能力极限状态、正常使用极限状态;绘制内力图;截面强度计算包括破坏阶段截面强度和斜截面强度的计算等。横隔梁设计包括横隔梁荷载计算以及配筋等。行车道板设计由荷载计算,内力组合和钢筋配置组成。支座设计包括确定支座尺寸,进行支座配筋的工作。计算表明,各项验算符合要求,设计方案合理。
关键词:预应力,混凝土,简支梁,上部结构设计
Abstract
As time goes by, traffic construction has e the key to economic development. Especially in bridge construction, which is prominent. In this paper, I construct a T type simple beam of prestressed concrete bridge, so as to explore some knowledge and content about the bridge design.
The design engineering is a separate bridge on a first class road from ** to ** .The bridge is meters long, composed of three-span, and each span’s length is meters, single lane for 12 meters, besides, both sides set up the sidewalk. The bridge deck pavement is made up of 8cm asphalt concrete and the cement concrete; and design load is for road -I level.
The bridge superstructure design includes the formulation of structural dimensions, the main beam design, the bridge deck design, diaphragm beams and bearing design. One concrete of bridges using C50, a standard strength of prestressed steel beam high-strength steel strand for the 1860Mpa , and bearing swing bearing to choose reinforced concrete .
The design of the main girder content are: the load calculation, the load transverse distribution calculation, internal force influence line drawing; Internal force calculation includes constant load internal force, live load internal force, etc.; Combination of internal force of the carrying capacity of the limit state, including normal use limit state; To draw internal; For section strength calculation including destruction during section streng