Optimal topology design of steelconcrete composite structures under stiffness and strength constraints
This study presents a three-phase topology optimization model and an effective solution procedure to generate optimal material distributions for complex steelconcrete composite structures. The objective is to minimize the total material cost (or mass) while satisfying the specified structural stiffness requirements and concrete strength constraints. Based on the DruckerPrager criterion for concrete yield behaviour, the extended power-law interpolation for material properties and a cosine-type relaxation scheme for DruckerPrager stress constraints are adopted. An enhanced aggregation method is employed to efficiently treat the large number of stress constraints, and the optimal topology is obtained through a standard gradient-based search. Several examples are provided to demonstrate the capability of the proposed optimization method in automatically finding the reasonable composite layout of steel and concrete.
steelconcrete composite structures topology optimization druckerprager criterion enhanced aggregation method