龙井桥施工图设计毕业论文

 2021-04-16 01:04

摘 要

本桥为浦口区农村公路危桥改造工程—龙井桥,新桥方案为1跨16m先张法预应力空心板梁桥,桥梁全宽18m。桥梁上部结构采用预应力混凝土(先张)简支空心板,桥台采用重力式桥台,桥台基础采用扩大基础。

本计算书通过计算龙井桥预应力混凝土空心板梁等上部结构及其下部结构。进行上部结构计算时,结合相关规范初步就理解空心板梁桥的设计思路方法,标准跨径16m,并排布置17块空心板;预应力钢筋布置,采用钢绞线,公称直径d=15.2mm,应使其重心线不超过束界范围;采用先张法预应力空心板梁构造形式,设计时应满足不同设计状况下规范规定的控制条件要求,例如承载力、抗裂性、变形及应力等要求。因此,预应力混凝土桥梁设计时,一般情况下,首先根据结构在正常使用极限状态要求正截面抗裂性或裂缝宽度限制确定预应力钢筋的数量,再由构件的承载力极限状态总要求确定普通钢筋的数量,然后进行持久状况截面承载力极限状态的计算,以及计算预应力钢筋的损失,最后进行应力验算、抗裂性验算、变形计算等,确定构件满足在承载力极限状态和正常使用极限状态下的各方面的各方面要求。进行下部结构计算时,采用U型重力式桥台,基础扩大基础。结合上部结构荷载,进行基础承载力验算、基底偏心距验算、基础稳定性验算以及沉降计算。

通过本毕业设计,能深刻认识各种桥梁形式的构造特点,施工方法等。在施工图设计过程中全面掌握连续梁桥的孔跨布置、上、下部结构形式的选择和结构设计计算方法,深化所学结构理论和桥梁知识,将理论和实际合理联系起来,为今后的学习和工作打下基础,对我个人来说也具有十分重要的意义。

关键词:张拉法;空心板梁;应力损失;U形扩大基础;设计计算

The Construction Drawing Design of Longjing Bridge

ABSTRACT

The bridge for the Pukou District Rural Highway Bridge reconstruction project - Longjing Bridge, the new bridge program for a cross 16m pre-tensioned prestressed hollow slab bridge, the bridge full width of 18m. The upper structure of the bridge is made of prestressed concrete (pre-tensioned) simply supported hollow slab. The abutment adopts gravity abutment and abutment foundation.

In this paper,This calculation book is calculated by calculating the superstructure and its lower structure of Longjingqiao prestressed concrete hollow slab beam. When the upper structure is calculated, the design method of the hollow slab beam bridge is understood in the light of the relevant specification. The standard span is 16m, and 17 hollow plates are arranged side by side. the auther designed and calculated upper pretressed concrete hollow sslabs struture and lower struture of TaiPingZhongGou bridge,ect.When calculating the upper strutur and loewer struture,combined with revelant specification and preliminary understannding of design method of hollow slabs bridge,27 pieces of hollow slabs are set up side by side.The pretressed reinforcement is use of shared steel strand, and the nominal diaemter 15.2mm.Line should keep its center ofgrevity not beyond the scope of bundle boundary.Prestressed reinforcement bends an angli combining with the change rule od shear..A pre-tension pretressed concrete form of hollow slabs struture should be designed to meet different situation under the contrrol of regulating the terms and condition, such as the bearing capacity of cracking crack width deformation and streee requirements.In these controlled conditions,the most important thing is to meet in hthe normal struture of state limits the ues of performance requrimengts and ensure that the struture is reached when the carrying capacity limit state has a safety reserve. Therefore, prestressed concrete bridge design, under normal circumatances, the first struture in accordance with the normal limit state is the use of anti-cracking cross-sevtion width of cracks or limit the normal of identified pretressed reinforced, and then from members of the of the bearing capcity limit state requirement detemine the general reinforcement. Then proceed to a lasting state of cross-ection of the carrying capacity limit state, and rhe calculation of pretressed reinforced the stress losses, ti stress the final checking, checking and cracking defirmation calculation to detemine the carrying capacity of components meet deformation calculation to determine the carrying capacity of components meet the limit state and the normal limit the use of the state all requirements, When calculating the lowed struture the use of U-type gravity abutment, the foundation to expand the foundation. Combined with the upper structure of the load, the basic capacity of the calculation, the base eccentricity check, the basis of stability checking and settlement calculation.

Through the graduation design,I can deeply understand the various forms of bridge structure characteristics, construction methods and so on. In the construction design process, we can grasp the selection of the hole girders of the continuous girder bridge, the selection of the upper and lower structures and the calculation method of the structural design, deepen the structure theory and bridge knowledge, The theory and the actual reasonable link for the future study and work to lay the foundation for me personally also has a very important significance.

After checking, the upper and lower structure of the bridge meets the requirements.

Key word: Post-tension; Hollow slabs; Stress loss; U-shaped expansion of the foundation; Design and calculation

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