Research on the Stability of Long Span Self-Anchored Suspension Bridges

Based on deflection theory,the differential equations,describing the relationships between the deformation and load of stiffening girders of self-anchored suspension bridges subject to dead load or live load,or both of these two loads,were built.By analyzing the equations,the following conclusions were obtained: it is important to check the main plane stability according to the state of the compression-bend beam under transverse load in order to design stiffening girders of self-anchored suspension bridge under dead load.However,it is not necessary to verify the stability character of the main plane in cable-suspended section under live load.Moreover,the view point that the static characteristics of self-anchored suspension bridges may be a match of truss whose height changes continuously,was concluded.The bridge test model was built to analyze the ultimate carrying capacity of the real bridge,and the over load test of self-anchored suspension bridges was carried out.And the results have verified the theory and its conclusion.