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THE PAPER PRESENTS ENHANCED BIOGEOGRAPHY-BASED OPTIMIZATION (EBBO) ALGORITHM FOR SIZE AND SHAPE OPTIMIZATION OF TRUSS STRUCTURES WITH DYNAMIC CONSTRAINTS. THE BBO ALGORITHM IS ONE OF THE RECENTLY DEVELOPED META-HEURISTIC ALGORITHMS INSPIRED FROM THE MATHEMATICAL MODELS IN BIOGEOGRAPHY SCIENCE AND BASED ON THE MIGRATION BEHAVIOR OF SPECIES AMONG THE HABITATS IN THE NATURE. IN THIS STUDY, THE OVERALL PERFORMANCE OF THE STANDARD BBO ALGORITHM IS ENHANCED BY NEW MIGRATION AND MUTATION OPERATORS. THE EFFICIENCY OF PROPOSED ALGORITHM IS DEMONSTRATED BY UTILIZING FOUR BENCHMARK TRUSS DESIGN EXAMPLES WITH FREQUENCY CONSTRAINTS. NUMERICAL RESULTS SHOW THAT THE PROPOSED EBBO ALGORITHM NOT ONLY SIGNIFICANTLY IMPROVES PERFORMANCE OF THE STANDARD BBO ALGORITHM BUT ALSO FINDS COMPETITIVE RESULTS IN COMPARING WITH RECENTLY DEVELOPED OPTIMIZATION METHODS.
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