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Shape Optimum Design of Pultruded FRP Bridge Decks  

조효남 (한양대학교 토목ㆍ환경공학과)
최영민 (한양대학교 토목ㆍ환경공학과 BK21)
김희성 (한양대학교 토목ㆍ환경공학과)
김형열 (한국건설기술연구원 구조연구부)
이종순 (한양대학교 토목ㆍ환경공학과)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.17, no.3, 2004 , pp. 319-332 More about this Journal
Abstract
Due to their high strength to weight ratios and excellent durability, fiber reinforced polymer(FRP) is widely used in construction industries. In this paper, a shape optimum design of FRP bridge decks haying pultruded cellular cross-section is presented. In the problem formulation, an objective function is selected to minimize the volumes. The cross-sectional dimensions and material properties of the deck of FRP bridges are used as the design variables. On the other hand, deflection limits in the design code, material failure criteria, buckling load, minimum height, and stress are selected as the design constraints to enhance the structural performance of FRP decks. In order to efficiently treat the optimization process, the cross-sectional shape of bridge decks is assumed to be a tube shape. The optimization process utilizes an improved Genetic Algorithms incorporating indexing technique. For the structural analysis using a three-dimensional finite element, a commercial package(ABAQUS) is used. Using a computer program coded for this study, an example problem is solved and the results are presented with sensitivity analysis. The bridge consists of a deck width of 12.14m and is supported by five 40m long steel girders spaced at 2.5m. The bridge is designed to carry a standard DB-24 truck loading according to the Standard Specifications for Highway Bridges in Korea. Based on the optimum design, viable cross-sectional dimensions for FRP decks, suitable for pultrusion process are proposed.
Keywords
FRP bridge decks; GAs; shape optimization; index technique;
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