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The description of beams assumes the Bernoulli‐hypothesis stating that undeformed plane cross sections remain plane during a displacement. This allows for a uniaxial material description which simplifies nonlinear material modelling to a large extent. The Bernoulli‐hypothesis is not applicable anymore for high beams or plates, respectively. Biaxial material laws are basically required and lead to a new level of complexity compared to uniaxial laws. Strut‐and‐tie models allow to treat plates whereby retaining the uniaxial approach. This is embedded in the FEM framework in this chapter whereby using truss systems with concrete struts and reinforcement ties. Nonlinear material behavior is modeled with nonlinear uniaxial laws, i.e. uniaxial elastoplastic stress‐strain relations. Furthermore, the rigid plastic framework is described and the important limit theorems of plasticity are introduced.
The description of beams assumes the Bernoulli‐hypothesis stating that undeformed plane cross sections remain plane during a displacement. This allows for a uniaxial material description which simplifies nonlinear material modelling to a large extent. The Bernoulli‐hypothesis is not applicable anymore for high beams or plates, respectively. Biaxial material laws are basically required and lead to a new level of complexity compared to uniaxial laws. Strut‐and‐tie models allow to treat plates whereby retaining the uniaxial approach. This is embedded in the FEM framework in this chapter whereby using truss systems with concrete struts and reinforcement ties. Nonlinear material behavior is modeled with nonlinear uniaxial laws, i.e. uniaxial elastoplastic stress‐strain relations. Furthermore, the rigid plastic framework is described and the important limit theorems of plasticity are introduced.
Strut‐and‐Tie Models
Häussler‐Combe, Ulrich (author)
Computational Structural Concrete ; 133-149
2022-10-20
17 pages
Article/Chapter (Book)
Electronic Resource
German
| Springer Verlag | 2022
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