Nonlinear Analysis Of Long-Span Cable-Stayed Bridges Under Dead Loads

With the perfection of design theory, great progress in construction and appearance of new material, the cable-stayed bridge has been one of the chief types for long span bridges. The records of spans of cable-stayed bridges have been rewritten again and again, geometric nonlinearity of structures also must be considered in real projects, since their spans become larger and larger. The determination of initial cable forces under dead loads and geometrical nonlinearity effects in large span cable-stayed bridge under dead loads are presented in the paper.In the designing of cable-stayed bridges, to determine initial cable forces under dead loads is a highly important task. Methods that have existed are analyzed in the paper firstly, an efficient computational method of influence matrix is proposed, which is perfected and more multi-restrictions can be took into account.Geometrical nonlinearity effects in large span cable-stayed bridge can not been neglected, Three sources of geometric nonlinearity of long span cable-stayed bridges are analyzed in the paper, which include the cable sag effect, the beam-column effect and the large displacement effect. Analyzing theories of geometric nonlinear problems of cable-stayed bridges have summarized. Based on all above theories a program is completed and is proved to be efficient.