Optimization of a Tunnel Lining Reinforced with FRP

Abstract:

This contribution describes the formulation of DBSO (deterministic based structural optimization) design of a tunnel lining. The principle by which a solution may be obtained for a problem concerning the dimensional and reinforcement design optimization of a concrete structure is introduced. The target function is defined as the minimum cost of used materials. The range of allowable solutions from the mathematical viewpoint is defined by constraining conditions expressed by relations derived from:equations of equilibrium (the solution of optimization calculations for a structure with a Winkler foundation using the finite element method),the reliability conditions of a reinforced concrete structure and from the continuity of deformations.The method (algorithm) for obtaining a serviceable reinforcement design (via the implementation of reinforcement types) from an optimal solution is described. The algorithm will be applied to the optimization of a tunnel lining design. FRP reinforcing bars will be used as reinforcement. The thickness of the tunnel lining and the areas of top and bottom reinforcement in cross-sections will be optimized. The obtained results will be compared with an optimized design created for the same tunnel structure but made from steel-reinforced concrete.

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