Research on Structural Design and Key Technology of the Main Bridge of Qujiang Super Large Bridge for Chengdu-Dazhou-Wanzhou High-speed Railway
The main bridge of the Qujiang Super-large Brigde of Chengdou-Dazhou-Wanzhou High-speed Railway has a calculated span of(139+278+139)m.The main bridge adopts a pier tower beam consolidation system.It is currently a cable-stayed bridge with a maximum span of 350 km/h for the concrete main beam of ballastless track under construction.In order to study the dynamic and static performance of the main bridge structure,finite element analysis software was used to establish a comprehensive calculation model of the entire bridge,conduct static and dynamic analysis of the entire bridge and calculate reasonable bridge structure design parameters.The results show that the strength,stiffness,and stability of the bridge during construction and operation meet the requirements of the specifications.Except for the yielding of the bridge tower crossbeam under the E2 earthquake,all other parts are in an elastic working state.Theoretical and numerical analysis methods are used to study key technologies such as the length of the main beam suspension casting section,the applicability of ballastless track,and the running performance of trains.The suspension casting construction of the hanging basket section of the bridge meets the requirements of the construction period,and the short wave and long wave deviations of the bridge meet the regulatory requirements.It has the conditions for laying ballastless tracks and meets the operating requirements of a train speed of 350 km/h.At the same time,a technical and economic comparison is made with the arch stiffened rigid continuous beam scheme,and the results shows that the partially cable-stayed bridge scheme with a main span of 280 m has good economic efficiency.
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