Dashengguan Changjiang River Bridge Ballast As A Whole Deck Structure Of The Program Selection,

Da Shengguan Nanjing Yangtze River Bridge is located in the lower reaches of the Yangtze River in Nanjing Da Shengguan. It is a six-line track and a six-span continuous steel truss arch bridge.This bridge is designed to reach the target speed 300km/h, Its building size and the target speed is unexampled both at home and abroad.In this paper ,we mainly study the floor system of this bridge are studied and the mainly work as follows:First, The floor system of the high-speed railway steel truss bridge at home and abroad can be categorized in form.Second, from the study of the programes of early combinatorial bridge deck ,it can be concluded that the Da Shengguan Nanjing Yangtze River Bridge with the characteristics of large span,more lines,high-speed is suitable to adopt the integrated steel bridge deck programe.Thirdly, for the Da Shengguan Nanjing Yangtze River Bridge ,it can put forword one programe about the combinition of vertical and horizontal beams and the ballast deck and another two programes about the integrated steel bridge deck, and take the 84 +84 m continuous steel truss bridge as an example for the calculation of comparative analysis, the application of each programe.can be summed up.a)If the Da Shengguan Nanjing Yangtze River Bridge uses the programe of the combinition of vertical and horizontal beams and the ballast deck,it should set scalable vertical beam,but it can cause the mutation of this bridge on stiffness ,so this programe is not advisable.b) If the Da Shengguan Nanjing Yangtze River Bridge uses a system of vertical and horizontal beam programe (ie. programe 1), the stress on horizontal beams of the middle support and the stress on internode vertical beams of the both sides of the middle support are big as a result of its big vertical and horizontal beams,and the bridge deck works together with the mail truss in high degree.c) If the Da Shengguan Nanjing Yangtze River Bridge uses a multi-cross beam program(ie.programe 2), Due to increase stroke Xiaxian and inter-section beams,besides for its small vertical beams and more horizontal beams ,the state of stress is better than that of programe 1.Forth, from the comprehensive analysis of all aspects, the programe 2 can be selected,ie. a multi-cross beam program.The structural design of the bridge is an important part of bridge design ,the research on the bridge deck of the Da Shengguan Nanjing Yangtze River Bridge is significant and its production has been applied to this bridge ,and it also provides references for other designs.