Vemuri, J P
(2015)
A Novel Statistical Model for Link Overstrength.
In:
Advances in Structural Engineering: Mechanics.
Springer, India, pp. 567-575.
ISBN 978-81-322-2189-0
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Abstract
The Eccentrically Braced Frame (EBF) has both high ductility and high stiffness characteristics. The key member of the EBF is the link, which acts as a sacrificial fuse by dissipating seismic energy. Steel design codes prescribe a constant overstrength factor for links, but experimental results have shown that such assumption can lead to either conservative or unsafe designs. In this paper, a statistical model to estimate overstrength due to strain hardening in steel EBF links is presented. The analysis involves a new parameter, “peak rotation”, a quantity which is not known a priori by the designer, but corresponds to the link rotation observed at maximum shear resisted by the link. A regression analysis is performed on experimental link data obtained from literature. The normalized link length, peak link rotation and the ratio of ultimate strength to yield strength are observed to affect link overstrength. A good fit is obtained between the calculated values from the model and the actual experimental values. The parameter estimates and their errors are tabulated and are found to be statistically significant. The residual analysis carried out on the independent parameters shows no trends.
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