Stability of Cable-Stayed Bridesby
Committee on Cable-Stayed Bridges of ASCE
This chapter deals only with stability under static loadings. For aerodynamic stabilities and stability of structure under seismic loading, see the appropriate chapters. Both the towers and the girder of a cable-stayed bridge are compression members. But these elements also carry significant bending stresses. The P-delta effect, then is basically a nonlinear behavior which usually increases the stresses in the structural elements. It is not directly a buckling problem. Due to the nonlinear effects, stresses and applied loads are no longer proportional to each other. The increase in stresses and deformations are usually faster than the increase of applied loads. Principle of superposition is not valid. The nonlinear effect should be considered in both the global analysis and the local analysis.
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