云龙桥上部结构设计
摘 要
本桥为一座预应力钢筋混凝土现浇连续箱型梁桥，设计书要求针对其上部结构进行建模、计算设计，所以我在参考大量文献资料的基础上，结合设计书要求并且针对本桥特点，针对预应力混凝土箱型梁桥结构在桥梁工程中的特点、发展以及设计方法写此文献综述。
预应力混凝土连续箱型梁桥是预应力桥梁的一种，它外形美观，具有可靠的强度、足够的结构刚度、变形小、抗震性能好、抗裂性好、行车舒适等优点，又加上预应力混凝土连续箱型梁桥桥型的设计施工均较成熟，施工质量和施工工期能得到控制，成桥后养护工作量小，使得这种桥型在公路和铁路桥梁工程中得到广泛采用。箱形截面能适应多种使用条件，特别适合于预应力混凝土连续梁桥、变宽度桥。箱梁有较大的抗扭刚度，应力值较低，徐变变形较小，箱梁截面有单箱单室、单箱双室或多室，早期为矩形箱，逐渐发展成斜腰板的梯形箱,同时连续箱梁具有桥面接缝少、刚度大、整体性强，外形美观，便于养护等优点。
关键词：预应力混凝土；连续箱型梁桥；桥梁结构设计；结构性能；设计方法。
Construction of the bridge superstructure design
ABSTRACT
This bridge is a Prestressed Concrete Continuous Box Girder Bridge, the calculation sheet requires to build the model and design the upper structure, so I combined with the calculation sheet and contraposed the characteristics of this bridge, on the basis of a large number of literature, especially the Prestressed Concrete Continuous Box Girder Bridge structure characteristics, development and the design methods in bridge engineering, to write this literature review.
Prestressed Concrete Continuous Box Girder Bridge is one of the Prestressed Concrete Bridge, it has a reliable strength, sufficient stiffness, small deformation, good seismic performance, good crack resistance and people can drive comfortably, at the same time, combined with the designs of Prestressed Concrete Continuous Box Girder Bridge construction are more mature, construction quality and construction period can be controlled, bridge maintenance workload is small, which make this bridge is widely used in highway and railway bridge engineering. Box Section can adapt to a variety of conditions of use, particularly suitable for Prestressed Concrete Continuous Girder Bridge and the width of the bridge. Box Girder has the larger torsional rigidity, low stress value and small creep deformation. It has single box single room and single room in two or three room. Early it was a rectangular box, and gradually developed into the oblique trapezoidal box. Continuous Box Girder are less deck joints, stiffness big, strong integrity, good appearance, easy maintenance, etc.
Key words: Prestressed concrete, Continuous Box Girder Bridge, Bridge structure design, Structure performance, Design method
