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Structural Engineering and Mechanics Volume 5, Number 6, November 1997 , pages 729-741 DOI: https://doi.org/10.12989/sem.1997.5.6.729 |
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Effect of loading rate on softening behavior of low-rise structural walls |
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Mo YL, Rothert H
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| Abstract | ||
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Cracked reinforced concrete in compression has been observed to exhibit lower strength and stiffness than uniaxially compressed concrete. The so-called compression softening effect responsible is thought to be related to the degree of transverse cracking and straining present. It significantly affects the strength, ductility and load-deformation response of a concrete element. A number of experimental investigations have been undertaken to determine the degree of softening that occurs, and the factors that affect it. At the same time, a number of diverse analytical models have been proposed by various this behavior. III this paper, the softened truss model thoery for low-rise structural shearwalls is employed using the principle of the stress and strain transformations. Using this theory the softening parameters for the concrete struts proposed by Hsu and Belarbi as well as by Vecchio and Collins are examined by 51 test shearwalls available in literature. It is found that the experimental shear strengths and ductilities of the walls under static loads are, in average, very close to the theoretical values: however, the experiment shear strengths and ductilities of the walls under dynamic loads with a low (0.2 Hz) frequency are generally less than the theoretical values. | ||
| Key Words | ||
| softening behavior, structural wall, loading rate, truss model, shear strength, ductility | ||
| Address | ||
| Mo YL, Natl Cheng Kung Univ, Dept Civil Engn, Tainan 70101, Taiwan Natl Cheng Kung Univ, Dept Civil Engn, Tainan 70101, Taiwan Univ Hannover, Inst Struct Anal, Hannover, Germany | ||