Limit Analysis and Design of Structural Concrete – Recent Research at ETH
Limit analysis and design approaches for structural concrete were greatly advanced in the 1960s and the 1970s, notably at the Technical University of Denmark and at ETH Zurich. Starting from a review of these developments, this presentation concentrates on recent pertinent research at the ETH, including the tension chord model, the cracked membrane model, the sandwich model and stringer panel models.
The tension chord model allows to treat problems of cracking, minimum reinforcement, tension stiffening and deformation capacity in a unified manner. The cracked membrane model combines the basic concepts of the modified compression field approach developed at the University of Toronto and the tension chord model. With the sandwich model, plate and shell elements subjected to general combined actions (bending and twisting moments, membrane forces and transverse shear forces) can be treated. Finally, some new considerations on stringer panel models are presented, providing an alternative to traditional truss model and stress field approaches.
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