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1 Computer Assisted Mechanics and Engineering Sciences

1 1999

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Optimal strut-and-tie models in reinforced concrete structures

Biondini F., Bontempi F., Malerba P. G.

Computer Assisted Mechanics and Engineering Sciences

1999

Vol. 6, No. 3-4

280-293

A general solution of the diffusion problems which concern the R.C. structures, may be deduced by the limit analysis, by means of truss schemes suitable to model the load transfer mechanism. In particular such schemes allows us to share the carrying functions between concrete and steel reinforcement. Latest developments call this kind a solution Strut-and-Tie (S&T) modellization. In this paper a procedure for the automatic search for optimal S&T models in R.C. elements proposed. A highly indeterminate pinjointed framework of a given layout is generated within the assgned geometry of the concrete element and an optimum truss according to a reference behaviour ( the principal stress field) deduced through a F.E.A. and assumed as representative of the given continuum. After having explained the theoretical principles and the mathematical formulation, some examples show the practical application of the procedure and its capability in handling complex stress paths, through schemes which result rational and suitable for a consistent design.