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1、本科生毕业设计（论文） / 本科生毕业设计(论文)题 目:黑龙江某大桥35m预应力混凝土简支T型梁桥上部结构设计 英文题目:Heilongjiangbridge35mprestressedconcrete simply-supported beam model T upper structure design系 :专 业:班 级:学 生:学 号:指导教师:职称:指导教师:职称:-4-摘 要在工程中预应力混凝土T型简支梁具有刚度大、变形小、行车平顺舒适、伸缩缝少、抗震能力强等优点，因此，无论是公路或者城市桥梁、高架道路还是跨越宽阔的河流桥均是首选的方案之一。关键词：预应力混凝土简支T梁；肋板式桥
2、台； 在铁路与公路桥梁的建设中，预应力梁得到广泛用，特别是后张法施工的简支梁。它不仅能节约材料，降低造价，而且能增强桥梁的跨越能力，减小梁高。但在大跨度后张简支梁的施工过程中，由于张拉后梁体起拱度太大，影响梁体以上结构层的施工。后张法预应力技术可以节约大量普通钢筋，减少几何截面尺寸和自重，但随着龄期增加以及桥梁投人运营，混凝土徐变会引起比较大的预应力损失，这对大跨度桥梁是很不利的。所以，预应力施工过程中质量控制显得尤为重要，后张法预应力技术被广泛运用在大型桥梁工程中，这需要广大工程技术人员在施工实践中不断地去探索和总结经验，进一步完善后张法预应力的施工工艺，从而提高预应力的施工质量。本设计位于
3、黑龙江，桥位中心桩号为K0+904.73，桥梁全长188.480m 。桥面净宽为净7+21.0m，设计荷载为公路级，人群荷载为3.0kN/m2。桥梁上部结构采用35m预应力混凝土T梁，横桥向4片主梁，纵向6跨.本桥设3道伸缩缝，分别在两桥台和桥中心处。支座采用普通板式橡胶支座，全桥设48个板式橡胶支座。本桥共进行了三部分内容设计，第一部分水文计算，在此部分计算了设计流量，确定了满足水文要求的最小桥长、桥面最低标高以及冲刷线标高；第二部分进行了上部结构设计，设计了上部结构总、横断面形式，拟定了T梁的截面尺寸，计算了荷载横向分布系数以及主梁内力，进行了配筋设计和结构验算。第三部分对施工工艺进行简要
4、的设计。Heilongjiangbridge35mprestressed concrete simply-supported beam model T upper structure designAbstractIn engineering model T with prestressed concrete beam distortion and stiffness big, driving smooth and comfortable, less expansion joints and anti-seismic capability etc, therefore, whether high
5、way or city Bridges, elevated road across the broad river bridge is one of the scheme are preferred. Railway and highway Bridges in the construction of prestressed beams, widely used, especially of the beam method construction after zhang. It can not only save materials, reduce cost, but also can en
6、hance Bridges across ability, minus the trabecular high. But in the large span beam after zhang construction process, because the body tension bulging degrees well.numerical examples is too great, influence of structural layers above beam body construction. This method can save thousands of ordinary
7、 prestressed technique reinforced, reduce geometry section size and self-respect, but with increased age for operation, and bridge concrete creep can cause bigger prestress loss, the large span bridge is very harmful. So, prestressed construction process quality control appears especially important,
8、 zhang method after prestressed technique has been widely used in large bridge engineering, this requires broad engineering and technical personnel in construction practice constantly to explore and summarizing the experience, further improve the prestressed construction of this method, so as to imp
9、rove the process prestressed construction quality. This design is located in heilongjiang, the center for 904.73, K0 + pile length, Bridges 188.480 m. Bridge banisters can meet for 7 + 2 x 1.0 net for highway design load m, level, the crowd load for 3.0 kN/m2. Bridge 35m upper structure adopts prest
10、ressed concrete T beam, to the bridge girder, longitudinal 6 4 slices. This bridge across three word set respectively, expansion joints in two abutment and bridge center place. Bearings, using common slab rubber bearings of the whole bridge set 48 slab rubber bearings. Key Words：Prestressed concrete
11、 simple span T beam； Ribbing abutment；This bridge were conducted three parts design, the first part, on the part of hydrologic calculation is calculated, determines the design discharge hydrological requirements of the bridge meet the lowest elevation and long, bridge deck flushing line elevation; T
12、he second part of the upper structure design, design the upper structure, draw up the total, cross-sectional form the section size of T beam, calculated load transverse distribution coefficient and the internal force, girder structure reinforcement design and checked. The third part of construction
13、technology brief design.目录摘 要1Abstract2引 言11文献综述21.1国内外研究状况21.2工程概况31.2.1桥面净空31.2.2设计荷载31.2.3设计水位31.2.4计算要求31.3结构形式31.4主要材料31.5上部结构说明书41.5.1技术标准和技术规范41.5.2技术标准41.5.3设计要求41.5.4施工工艺52水文计算62.1计算设计洪水流量62.2桥长的计算72.2.1桥孔净长度72.2.2河床桥孔布设72.2.3桥面最低高程计算72.3冲刷计算82.3.1一般冲刷后水深82.3.2桥墩局部冲刷深度92.3.3桥墩的最低冲刷线高程92.4本章
14、小结93上部结构设计103.1尺寸拟定103.1.1主梁间距与主梁片数103.1.2主梁高度103.1.3主梁截面细部尺寸103.1.4计算截面几何特性123.1.5横截面布置143.1.6横截面沿跨长的变化153.1.7横隔梁的设置153.2主梁内力计算153.2.1恒载内力计算153.2.2活载内力计算203.2.3计算活载内力283.2.4主梁内力组合453.3预应力钢筋数量的确定和布置483.3.1估算预应力钢筋数量的确定和布置483.3.2估算普通钢筋数量的确定和布置493.4截面几何性质计算533.5承载能力极限状态计算593.5.1斜截面抗剪承载力计算593.5.2距支点h/2截
15、面抗剪承载力验算593.5.3变截面点处抗剪承载力验算613.6预应力损失计算633.6.1摩阻损失633.6.2锚具变形损失653.6.3分批张拉损失653.6.4第一批预应力损失汇总703.6.5钢筋应力松弛损失713.6.6混凝土收缩、徐变损失713.7正常使用极限状态723.7.1正截面抗裂性验算723.7.2斜截面抗裂性验算733.8持久状况应力验算773.8.1跨中截面混凝土法向正应力验算773.8.2斜截面主应力验算783.9短暂状态应力验算803.9.1上缘混凝土应力803.9.2下缘混凝土应力813.10本章小结814.施工方法设计824.1预应力混凝土梁的预制824.1.1模板824.1.2预应力钢筋的置备模板824.1.3预应力钢筋的张拉824.1.4孔道压浆824.2预应力混凝土梁的安装824.3桩基础的施工844.3.1准备工
