摘 要在本设计中，根据地形图和任务书要求，依据现行公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两种桥型方案。按照“实用、经济、安全、美观”的桥梁设计原则，经过多方面的比选最终选择 46m+76m+46m 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、桥梁施工组织设计等主要内容。 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：比选方案；连续梁桥；Midas；结构分析；验算共 78 页 第 1 页ABSTRACTIn this design, according to the topography and project requirements and on the basis of the current highway bridge design specifications, the author put forward two schemes, prestressed concrete continuous girder bridges and continuous rigid-frame structure of prestressed concrete. In adherence to bridge design principles, “practical, economical, safe and good-looking”, prestressed concrete continuous girder bridges of 46m + 76m + 46m were finally chosen as the recommended designing model after various comparison and selection. The design made full use of Midas to conduct the structural analysis. It built up the basic model of the bridge taki consideration of the expected size, and then took the analysis of internal force and calculated reinforcement results, accomplishing actual construction analysis of every phase as well as cross section checking. Meanwhile, during the process, elements including creep and shrinkage of concrete, creep secondary internal force and temperature se...
