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Structural Engineering and Mechanics Volume 7, Number 3, March 1999 , pages 241-257 DOI: https://doi.org/10.12989/sem.1999.7.3.241 |
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Optimum design of cable-stayed bridges |
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Long WY, Troitsky MS, Zielinski ZA
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| Abstract | ||
| This paper presents a procedure to minimize the cost of materials of cable-stayed bridges with composite box girder and concrete tower. Two sets of iterations are included in the proposed procedure. The first set of iteration performs the structural analysis for a cable-stayed bridge. The second set of iteration performs the optimization process. The design is formulated as a general mathematical problem with the cost of the bridge as the objective function and bending forces, shear forces, fatigue stresses, buckling and deflection as constraints. The constraints are developed based on the Canadian National Standard CAN/CSA-S6-88. The finite element method is employed to perform the complicated nonlinear structural analysis of the cable-stayed bridges. The internal penalty function method is used in the optimization process. The limit states design method is used to determine the load capacity of the bridge. A computer program written in FORTRAN 77 is developed and its validity is verified by several practical-sized designs. | ||
| Key Words | ||
| bridges, cables, structures, structural analysis, nonlinearity, optimization, optimum design, box girder, composite structures | ||
| Address | ||
| Long WY, Dept Transportat, Transportat Syst Informat Program, Off Highway Syst Engn, 1120 N St,MS 38,POB 942873, Sacramento, CA 94273 USA Dept Transportat, Transportat Syst Informat Program, Off Highway Syst Engn, Sacramento, CA 94273 USA Concordia Univ, Dept Civil Engn, Montreal, PQ H3G 1M8, Canada | ||