| Autor: |
Daniel A. Kuchma, Thomas Nagle, Sukit Yindeesuk, Heui Hwang Lee, Jason Hart |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
ACI Structural Journal. 105 |
| ISSN: |
0889-3241 |
| DOI: |
10.14359/19941 |
| Popis: |
ACI code provisions for design by the strut-and-tie model (STM) approach assume that the concrete structure is sufficiently ductile to support the load in the manner envisioned by the designer. This assumption has only been properly validated by tests on structures with a few truss members, such as by tests on deep beams. This paper describes three sets of STM validation experiments on more complex D-regions, in which each region was designed by multiple strut-and-tie models that had up to 37 members and were statically indeterminate. The results indicate that the use of the STM approach and ACI 318-02 provisions lead to conservative designs. However, the members typically had little post-peak ductility. This indicates that the structures did not behave as plastic trusses, which is the basis for calculating capacity of indeterminate STM trusses. Other findings indicate that the stiffness of ties and key structures can be predicted well by STM assumptions in most cases. However, the load-deformation response under service load levels can be significantly influenced by the selected shape of the load-resisting truss. A poor selection for the shape of a STM can lead to unacceptable levels of cracking and damage under service loads. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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