In the nonlinear strut-tie model approach, nonlinear analysis techniques in the selection, analysis and verification processes of strut-tie models are incorporated. The nonlinear analysis techniques incorporated in the approach can eliminate the limitations the current linear strut-tie model approach have in the prediction of behavior and strength of structural concretes as well as in the design of structural concretes which experience nonlinear behavior.

The interactive computer graphics program for the nonlinear strut-tie model approach consists of three parts. The first and second parts are considered as a pre- and post-processor for a finite element analysis of two-dimensional plain concrete and plane truss structures. The third part of the program is a design routine for dimensioning and detailing the components of the developed strut-tie model. The use of interactive computer graphics program in the nonlinear strut-tie model approach is illustrated with the analysis and design examples of a prestressed concrete deep beam and a squat shear wall subjected to lateral forces, respectively. The nonlinear strut-tie model approach with computer graphics capabilities can provide effective and consistent solutions to a large number of complex analysis and design situations.

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