Basic Structural Performance of Partially Anchored Suspension Bridge

Abstract:

In order to extend the application of self-anchored suspension bridge， a novel type of partially anchored suspension bridge was proposed based on externally anchored suspension bridge and self-anchored suspension bridge， and the basic performance of the structural system was studied. The main research contents include structural analysis based on the deflection theory， parameter analysis of static performance， natural vibration characteristics， and design method of anchorage. The results show that the static performance of partially anchored suspension bridge is between the externally anchored suspension bridge and the self-anchored suspension bridge， and the gravity stiffness is provided by the anchor cable tension when the bridge is formed. Under the action of live load， the increment of internal force of main cable is distributed in the anchor cable and the main beam according to their stiffness， which reflects the characteristics of “partial anchor”. The structural system can adjust the force state by actively tensioning the anchor cable， and the beneficial effect of passive earth pressure can reduce the weight of gravity type anchorage. Partially anchored suspension bridge is especially suitable for special positions with limited construction conditions. The tensioned and adjustable anchor cables provide a new scheme for design and construction. It can be concluded that partially anchored suspension bridge has certain advantages.

Key words:s uspension bridge;partial anchor;structural system;parameter analysis;design of anchorage