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Structural Engineering and Mechanics
  Volume 64, Number 5, December10 2017, pages 567-577
DOI: http://dx.doi.org/10.12989/sem.2017.64.5.567
 


A multi-parameter optimization technique for prestressed concrete cable-stayed bridges considering prestress in girder
Qiong Gao, Meng-Gang Yang and Jian-Dong Qiao

 
Abstract
    The traditional design procedure of a prestressed concrete (PC) cable-stayed bridge is complex and time-consuming. The designers have to repeatedly modify the configuration of the large number of design parameters to obtain a feasible design scheme which maybe not an economical design. In order to efficiently achieve an optimum design for PC cable-stayed bridges, a multi-parameter optimization technique is proposed. In this optimization technique, the number of prestressing tendons in girder is firstly set as one of design variables, as well as cable forces, cable areas and cross-section sizes of the girders and the towers. The stress and displacement constraints are simultaneously utilized to ensure the safety and serviceability of the structure. The target is to obtain the minimum cost design for a PC cable-stayed bridge. Finally, this optimization technique is carried out by a developed PC cable-stayed bridge optimization program involving the interaction of the parameterized automatically modeling program, the finite element structural analysis program and the optimization algorithm. A low-pylon PC cable-stayed bridge is selected as the example to test the proposed optimization technique. The optimum result verifies the capability and efficiency of the optimization technique, and the significance to optimize the number of prestressing tendons in the girder. The optimum design scheme obtained by the application can achieve a 24.03% reduction in cost, compared with the initial design.
 
Key Words
    cable-stayed bridge; prestressed concrete; multi-parameter; optimization technique; prestressing tension
 
Address
Qiong Gao : School of Civil Engineering, Central South University, Changsha 410075, P.R. China

Meng-Gang Yang : School of Civil Engineering, Central South University, Changsha 410075, P.R. China

Jian-Dong Qiao : School of Civil Engineering, Central South University, Changsha 410075, P.R. China
 

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