Seismic Design of Large - span Half - through CFST Arch Railway Bridge;

Research purposes; Large - span concrete filled steel tube arch bridge has a good span ability, and has been well developed and applied in highway, railway and other transportation fields. However, there has been no successful construction in the high intensity seismic area of 8 degrees and above, and its seismic performance and measures have still yet to be studied. With Zangmu Yarlung Zangbo River Bridge of Lhasa - Linzhi Railway as the background, this paper formulates reasonable seismic fortification standards and performance index, according to the large span bridge seismic concept design principle, determines the seismic design scheme, establishes numerical model, carries out a nonlinear time - range analysis, studies the railway large - span concrete filled steel tube arch bridge seismic performance and reasonable shock isolation measures. Research conclusions: (1) The large - span half - through concrete filled steel tube arch bridge adopts a continuous narrow width main beam, weight reduction and comprehensive isolation measures for shock isolation scheme, which can effectively reduce the internal force of the structure and control the displacement under rare earthquake conditions. (2) The research results show that the large - span concrete filled steel tube arch has good seismic performance when using reasonable structure and shock isolation measures, and the main structure of the 8 - degree high - intensity seismic area can also maintain the basic elasticity under the rare earthquake action, with good technical and economic performance. (3)The research results can provide reference for the railway large - span concrete filled steel tube arch bridge in high intensity seismic area. © 2023 Editorial Department of Journal of Railway Engineering Society. All rights reserved.