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Date of Publication:2017-01-01

Journal:中国铁道科学

Affiliation of Author(s):建设工程学部

Issue:2

Page Number:49-54

ISSN No.:1001-4632

Abstract:In order to determine the reasonable cable force and main cable configuration for suspension bridge,an optimization method for cable force of suspension bridge was proposed based on influence matrix theory.The initial stiffness of suspension bridge was formed under initial loads,which included dead load and assumed initial cable force.According to the initial stiffness and superposition principle,the influence matrix of suspension bridge was obtained.Based on the influence matrix,cable forces were iterated and updated.The structural responses of suspension bridge under dead load and cable force were calculated by FEM.After convergence,the reasonable cable forces and main cable configuration of suspension bridge were obtained.The method was applied to optimize the cable force for a two-tower suspension bridge with the main span of 460 m.The calculated results were basically in agreement with the results of existing literature.Moreover,the method could also optimize the internal force,stress and displacement etc.The convergence speed was rapid and could meet engineering requirements.

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