Bridge Design Concept and Innovation of Chengdu-Dujiangyan Intercity Railway-Post Wenchuan Earthquake Reconstruction Project in Sichuan, China

Abstract

Chengdu-Dujiangyan Railway is the first major post-earthquake reconstruction project after wenchuan earthquake. The area along the railway is densely-populated and economically-developed Chengdu Plain, especially Mount. Qiangcheng and Dujiangyan are world-famous tourist attractions. The bridge is designed under the guidance of overall landscape planning of the whole line. The single-box single-cell section and inclined web with a big angle of inclination is used for simply-supported box beam. The shield and noise barrier are designed together with outline of beam body as a whole, which may make bridge aesthetical in appearance and meet the requirements of technical standards in dynamical performance and load bearing capacity of the structure. On the full consideration of the characteristics of the railway, the seedling-shaped piers are adopted, which have a profound meaning, and also a landscape effect for effectively taking into account both high pier and low pier. The continuous beam bridge is designed according to the principle of smooth transition with adjacent simply-supported beams. The movable bearing for main pier is the pot rubber bearing with damper. In the event of earthquake, the dampers will be locked, which make piers with movable bearing and piers with fixed bearing together bear the longitudinal horizontal force. For the wider turnout continuous beam the partitioning width structure design method is used to reduce the influence due to transverse deformation. For overpass highway intersection with a small angle the frame pier is used and the slotting method on the column body is used to increase the vertical visual effect. The setting of bearing on the top of partial columns for long bent cap frame pier in the elevated station can reduce effectively the temperature effect. The noise barrier is designed with the shield matching on the bridge. The steel plate is embedded on the top of shield as the foundation post for noise barrier or as reservation of the foundation condition of post for noise barrier.