合肥学院多跨预应力简支T型梁桥.doc

合肥学院多跨预应力简支T型梁桥
学校代码: 学号:
Hefei University
毕业设计 BACHELOR DISSERTATION
设计题目: 多跨梁桥综合设计学位类别: 学科专业: 土木工程作者姓名: 王守亮导师姓名: 韩振峰完成时间: 2015年5月
多跨梁桥综合设计摘要
梁桥是指结构在垂直荷载作用下,支座只产生垂直反力而无水平反力的梁式体系桥的总称,该类桥的特点是受力明确,计算简单,理论与实际吻合好,施工也比较方便。预应力混凝土T行桥梁结构简单,受力明确,节省材料,架设安装方便,跨越能力较大等优点。
本设计的主要内容包括:纵横断面布置,主梁设计,横隔梁设计,还有行车道板设计。纵横断面布置:根据规范要求和工程实践经验确定主梁间距与主梁片数和主梁高度及各截面主要尺寸。主梁设计:内力计算由恒载内力和活载内力计算组成。恒载内力由结构力学可求出,而活载内力计算时要利用按修正偏心压力法计算得出的荷载横向分布系数。根据计算得出的各种内力组合确定设计控制内力进而对预应力钢束数进行估算。按后
张法制作主梁,采用锥型锚具和直径50mm的抽拔橡胶管,计算各种预应力损失得出有效预应力,对主梁进行强度、应力和变形验算。行车道板设计:本设计中行车道板的受力图示为单向板。
关键词:T型梁砼;预应力;灌注桩;后张法;修正偏心压力法
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Integrated design of multi span girder Bridges ABSTRACT
Girder bridge is refers to the structure under vertical load, bearing makes vertical reaction and no level is the floorboard of the reaction system of beam bridge, the bridge is the feature of stress is clear, simple calculation, theory and the actual match well, construction is convenient. Prestressed concrete T bridge structure is simple, stress, save material, the erection convenient installation, large spanning capacity, etc.
The main content of this design is as followings: The arrange of longitudinal section and lateral section, Main beams design, Crossing beam designing and Drive-way plank arrange of longitudinal section and lateral section:According to the specification and the experience of practical engineering, we can decide the distance of girders, the number of the girders, the height of the main beams and the main size of each beams design: Internal forces include invariable force and variable force. We can use the method of the structural mechanics. To calculate the variable internal force, we calculate the lateral direction coefficient of the load with the
method of corrected eccentricity the result of the calculation, we can obtain the control internal force, and we can approximately decide the number of the pre-stressed concrete the main beams with post-ten