Optimization of cable-stayed bridges with three-dimensional modelling

Abstract

Abstract-Thispaper describes an analytical sensitivity analysis and optimization implementation for cable-stayed bridge design. The finite element software is based on the Vax/VMS version of the Modulef code [I MODULEF Reference Guide. INRIA (1992).] and was adapted to an IBM-PC compatible. The main focus of this research concerns the analytical sensitivity analysis developed on this platform. The cable-stayed bridge optimization is posed as a multiobjective optimization with goals of minimum cost of material, stresses and displacements. Cable anchor positions on the main girder and pylon and cross-sectional sizes of the structural members are dealt with as design variables. By using the maximum entropy formalism it is shown that a Pareto solution may be found indirectly by the unconstrained optimization of a scalar function. The validity and effectiveness of the proposed technique is examined by means of a three-span steel cable-stayed bridge. 0 1997 Civil

Study of super long span cable-stayed bridges with CFRP components

“…The condition under reasonable stay cable forces is consequently referred to as the ''reasonable dead load condition''. The Minimum Bending Energy Method [29,30] is one of the common and convenient methods to determine the reasonable stay cable forces. This method starts with considering the minimal deformation energy of girders when the girder is subjected to reasonable stay cable forces and self-weight.…”

Structural behavior of non-symmetrical steel cable-stayed bridges

“…A similar approach was used by Guan in terms of deflections. (7) Optimization Criterion (Baldomir et al 2010, Negrao and Simoes 1997, Simoes and Negrao 2000. In this criterion, the prestressing stay cable forces are defined by the minimization of a scalar objective function.…”

Optimization of cable forces on concrete cable-stayed bridges including geometrical nonlinearities

“…The main objective was to find the minimum-cost design based on certain functions that are related to structural efficiency or economy, using geometric and cross-sectional design variables and ensuring that the stresses and displacements throughout the structure remain within allowable limits. The optimization was also carried out considering three-dimensional modelling, the seismic action and including box-girder deck sections [8][9][10]. The optimization of the cable forces in steel [11][12][13][14] and concrete cable stayed-bridges [15] was also reported.…”