Abstract:Weihe River Bridge in the Xianyang High-tech Zone is a double-pylon no-backstay cable-stayed bridge. Its unique design was determined through a competition. The bridge is located in an 8-degree earthquake zone. In high-intensity areas, the cable-stayed bridges without backcables are rarely used due to the heavy weight of the bridge pylons. The seismic resistance system of the bridge is studied and designed. After comparing the seismic responses of the two systems, the continuous support system, in which the girder is continuous, the pylon beam is consolidated and the support is set at the bottom of the beam, is more reasonable. The bridge pylon is used of steel-concrete composite structure, which not only balances the cable forces, but also better accommodates the eccentric compression requirements of the pylon. The girder is in a multi-girder form according to the construction conditions of the site. The structural calculations of the bridge show that the structural design all meet the code requirements and can provide a reference for the construction of cable-stayed bridges without backstays in high-seismic regions.
