1、1 摘 要 在本设计中，根据参考图纸的要求，依据现行铁路桥梁设计规范提出了预应力混凝 土连续梁桥、预应力混凝土连续刚构、简支梁桥三种桥型方案。按照“实用、经济、安 全、美观”的桥梁设计原则，经过对各种桥型的比选最终选择 48m+80m+48m 的预应力 混凝土连续梁桥为本次的推荐设计桥型。 本设计利用 Midas 软件进行结构分析，根据桥梁的尺寸拟定建立桥梁基本模型，然 后进行内力分析，计算配筋结果，进行施工各阶段分析及截面验算。同时，必须要考虑 混凝土收缩、徐变次内力和温度次内力等因素的影响。 本设计主要是预应力混凝土连续梁桥的上部结构设计，设计中主要进行了桥梁总体 布置及结构尺寸拟定、桥梁
2、荷载内力计算、桥梁预应力钢束的估算与布置、桥梁预应力 损失及应力的验算、次内力的验算、内力组合验算、主梁截面应力验算。 最后，经过分析验算表明该设计计算方法正确，内力分布合理，符合设计任务的要 求。 关键字：连续梁桥；连续刚构；简支梁桥；结构分析；验算 Abstract 2 In this design, according to the referencing drawings requirements，according to the current Railway bridge design specification of prestressed concrete continuous
3、 girder bridge forward, Prestressed concrete continuous rigid-frame structure, simple supported girder bridge. According to the “practical, beautiful, safe, economic and convenient for construction of bridge design principles, structure after the bridge of various final choice of 48m + 80 + 48m pres
4、tressed concrete continuous girder bridge design for this recommendation. This design using the Midas software analysis the structure，according to the size of the bridge, the basic model establishment bridge worked，then force analysis，calculation results of reinforced，for each phase analysis and construction. At the same time, must consider the concrete shrinkage, Creep force times and temperature resultant times factors. The design of prestressed concrete continuous girder bridge is mainly th
