Analysis Of Creep Deformation And Vehicle-bridge Dynamic Response Of Long Span Continuous Rigid Frame Bridge

With the development of the railway constructions in China, railway network is being built more and more widely. Railways are generally built in the suburbs, and most of them have to cross major rivers and state or provincial roads etc. Usually, there are increasingly needs to build bridges. The main forms of bridge structure, commonly used in the railway, are simply supported beams, continuous beams, continuous rigid frame bridges, cable-stayed bridges, Among them, simply supported beams, continuous beams and continuous rigid frame beams are commonly used bridge types. And the tracks that the Passenger-only lines are basically using are non-ballast tracks. Non-ballast track is a track structure type, which mortar with concrete or asphalt to replace the ballast track bed of granular. It has the following characteristics:high track stability, better uniform stiffness, strong durability. For high-speed railway, compared to traditional ballasted track, it has better adaptability. However, the erection of the bridge which have non-ballast track, requires high-precision control of erection.As a commonly used railway bridge type, continuous rigid frame bridge are usually erected by cantilever-construction method. It has the following advantages, such as large spanning capacity, bearing savings, Structures of linear appearance.etc. Therefore, it took possession of railway construction in the broader market. Taking into account the late creep have a great influence on the structure. In this thesis, taking a four-span continuous rigid frame as the background, which is under construction in Guang-Shen-Gang Passenger Railway Line (Range from Guangzhou to Shenzhen) and Its span is (112+168+168+104) m, From the three aspects of structure size, closure order, and the jacking force while closing. This Thesis analyzes the effect of the structural creep and chooses the suitable design for the real engineering project.This thesis also conducted a dynamic analysis of this bridge, coupled vibration responses between the train and bridge under different vehicles is calculated and analyzed to evaluate the dynamic performance of the bridge and the safety and comfort of the train.The analysis provides a theoretical basis to a better application of non-ballast track on the continuous rigid frame bridges and gives reference for the design of the similar bridges.