Abstract

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Title:: Study on Mechanical Properties and Steel Consumption of Double-cable Multi-span Suspension Bridge

Author(s):: CHAI Sheng-bo; WANG Xiu-lan; REN Xiang; School of Architecture and Civil Engineering, Xi’an University of Science and Technology

Keywords:: suspension bridge; double-cable; multi-span; mechanical property; steel consumption

Abstract:: In order to determine the mechanical properties and economic performance of double-cable multi-span suspension bridge, the stiffening girder deformation and bridge tower stress of double-cable multi-span suspension bridge and traditional multi-span suspension bridge under live load were compared, as well as the steel consumption of the two main cable systems was analyzed. Finite element models of the suspension bridge with four towers and three main spans in double-cable system and traditional cable system were established, and the deformation and force of the structure under live load were calculated respectively. The study results show that the longitudinal stiffness of main cable in double-cable system can be two to four times higher than that of the traditional suspension system. The longitudinal stiffness of double-cable system is related to the sag and the dead load distribution of the upper and lower cables. The steel consumption of doublecable system is almost the same as the traditional cable system. The deflection of stiffening girder and bending moment at tower bottom in double-cable suspension bridge are much smaller than that of the traditional multi-span suspension bridge when the antipushing rigidity of bridge tower is relatively low. The double-cable system can increase the stiffness of multi-span suspension bridge effectively.