Analytical Comparison of Various Stress-Strain Models for Concrete

Analytical Comparison of Various Stress-Strain Models for Concrete PowerPoint PPT Presentation


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Presentation overview. IntroductionModels Studied Richart, Brandtzaeg and Brown's Sheikh and Uzumeri'sMander, Preistley and Park'sLi'sResults of Models Using Set ParametersConclusion. Introduction to Concrete. One of the most important building materialsContents in concretewater- ce

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Analytical Comparison of Various Stress-Strain Models for Concrete

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1. Analytical Comparison of Various Stress-Strain Models for Concrete Dave Bossu, Oliver Nicolas Alex Wong CE 334, Professor Yan Xiao May 2, 2002

2. Presentation overview Introduction Models Studied Richart, Brandtzaeg and Brown’s Sheikh and Uzumeri’s Mander, Preistley and Park’s Li’s Results of Models Using Set Parameters Conclusion

3. Introduction to Concrete One of the most important building materials Contents in concrete water - cement air - aggregates(fine and coarse) Advantages moldable high compression strength fireproof Disadvantages low tensile strength low strength/weight ratio labor intensive

4. Richart, Brandtzaeg, and Brown’s Model One of the earliest stress-strain models (1928) Used 4 x 8 inch concrete cylinders Discovered that the strength and corresponding strain was increasingly proportional to the transverse pressure

5. Richart, Brandtzaeg, and Brown’s Model

6. Sheikh and Uzumeri’s Model Developed in 1982 Developed from 24 tests along with other data from different researchers Focused on stress-strain relationship for confined concrete in tied columns

7. Sheikh and Uzumeri’s Model

8. Mander, Preistley, and Park’s Model Developed in 1988 More general model for confined concrete with different transverse reinforcements Can be used for various cross sections, load types, and reinforcements

9. Mander, Preistley, and Park’s Model

10. Li’s Model Developed in 1994 Based on tests conducted on square reinforced columns Basically a modification of model developed by Mander, Preistley and Park

11. Li’s Model

12. Comparison of different models Strength without pressure = 3000 psi Lateral pressure = 1000 psi

13. Conclusion Values for confined strength somewhat similar Values for strain greatly varied For comparison parameters: Strength 6048 (Li) to 7150 (Mander et al.) 18% difference Strain 0.0092 (Li) to 0.0237 (Richart et al.) 158% difference

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