| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 93 === Long-span cable-stayed bridges are the highly flexible structure. Although the material in the members of a cable-stayed bridge structure behaves in a linear elastic manner, the overall load-displacement relationships for the structure will be nonlinear under normal externally force. The sources of geometrically nonlinear in cable-stayed bridges mainly include the cable sag effect, beam-column effect in the bridge deck and towers, and large deflection effect of the bridge. Therefore this paper analyses taking into account the geometric nonlinearity both in the static and dynamic analyses. Formerly considering the nonlinearity in the inclined cable stays is to consider an equivalent straight chord member with an equivalent modulus of elasticity in finite element computation procedure. Even though this method is convenient to consider the cable sag effect, but it can not to analyses dynamic action of single cable. The paper is used an elastic catenary cable element for the stay cables. This element is derived from an exact solution of the governing differential equation of an elastic catenary cable. This method can assay dynamic behaves of cable structures. This paper analyses resonance oscillation of the cable structures and analyses vibration of cable interaction with the deck dynamic behavior. In the future, we can continue the mode of analysis to analyses of wind induced responses of cable-stayed bridges.
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