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摘 要
本设计为高速公路（64＋2×113+64）m连续梁桥设计。本设计的桥梁为单室，三车道，四跨公路连续梁桥，桥面宽度为12.75m,桥底宽7m。支座处梁高为7m，跨中处为 3m，按1.6次抛物线变化；底板厚度支座处为0.8m,跨中为0.4m，线性变化；腹板厚度支座处0.7m，跨中处0.4m，线性变化。桥轴线为直线，采用2%的横坡设计，不设置纵坡。设计荷载为公路—Ⅰ级。
本设计主要采用桥梁博士3.0分析软件来进行结构内力分析计算，期间也用了Autocad 和Excel进行辅助设计。全桥上部结构共分为112个梁单元，定义有51个施工阶段。
本设计的顺序是在CAD中画好各个截面，导入桥梁博士完成桥梁建模。并把每个毛截面的特性和内力以文本的形式输出。对荷载进行简单组合，把自重内力与移动活载内力进行组合用来初步估算纵向预应力钢筋束量。运行桥梁博士数据计算，根据估算的预应力钢筋束在桥梁博士中调束，最后以文本的形式输出桥梁的预应力损失和各个次内力的数据。接着进行各项验算，若验算通过则设计成功，否则返回进行调束，进行验算，直至验算通过。最后出图并编写计算书。
关键词：预应力混凝土；梁桥；悬臂浇筑施工；设计；
Abstract
The design for the highway (64 +2 × 113 +64) m continuous girder bridge design. The design of the bridge is a single room, three-lane, four-span continuous girder road bridge deck width 12.75m, bridge bottom width 7m. Bearing beam at a height of 7m, at midspan is 3m, by 1.6 times parabola; backplane thickness at the support of 0.8m, cross for 0.4m, linear change; web thickness bearing at 0.7m, at midspan 0.4m, linear. Bridge axis is a straight line, using a 2% cross slope design, do not set the longitudinal slope. Design load for the highway -1.
This design uses Dr. Bridges 3.0 analysis software for structural analysis and calculation of internal forces, also used during the Autocad and Excel aided design. Ministry of full bridge girder structure is divided into 112 units, there are 51 definitions construction phase.
The design is in the order of the CAD drawing the various sections, the import is completed, Dr. bridge bridge modeling. And the characteristics and internal forces the output of each section of the hair in the form of text. For simple load combination, the weight of internal forces and moving live load force combined to preliminary estimates the amount of longitudinal prestressing tendons. Dr. Run bridge data calculation, based on estimates of prestressing tendons, Dr. bridge beam tuning in, the final form of text output bridge prestressing loss of secondary forces and various data. Followed by the checking, checking through the design if successful otherwise returns be adjusted beam, checking, checking up through. Finally, a map and written calculations.
Keywords: prestressed concrete; bridge; cantilever casting construction; design;
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