On evaluation of a unified moment-rotation characteristic of steel and steel-concrete composite joints
Marian Giżejowski , Wioleta Barcewicz , J. Uziak , A.A. K. Saleh
AbstractThe steel and steel-concrete composite joints moment-rotation characteristic postulated in present structural eurocodes is based on a piecewise relationship consisting of the linear part, in the quasielastic region (up to the limiting value of two third of the joint moment resistance), and - from that point - of the curvilinear part, valid for the inelastic region (up to the limiting value termed the joint moment resistance). This characteristic for end-plate joints is proposed to be of the same format for steel and composite joints, therefore its shape is not dependent upon the reinforcement ratio. Such an approach has an advantage of being simple but, on the other hand, leads to a discontinuous function describing the joint tangent stiffness. It is also not general enough to be able to account for the effect of joint post-limit hardening stiffness. In order to capture the effect of joint progressive stiffness degradation with the hardening effect taken into account, a unified three parametric continuous analytical model is developed. All the details of this model are presented together with the calibration procedure for basic model parameters. Experimental data obtained from laboratory tests carried out at theWarsaw University of Technology is used for the calibration of developed model. Its results are given together with the proposed values of calibrated model parameters for practical application. Finally, momentrotation characteristics according to the developed model obtained with the use of calibrated model parameters are compared with the experimental results for different values of the joint reinforcement ratio. Conclusions with regard to engineering practice are drawn.
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Zingoni Alphose (eds.): Research and applications in structural engineering, mechanics and computation. International conference, 2013, Leiden, CRC Press, ISBN 978-1-138-00061-2, 928 p.
SEMC 2013 International Conference.pdf / No licence information (file archived - login or check accessibility on faculty)
|Keywords in English||Calibration procedure; Discontinuous functions; Engineering practices; Joint reinforcement; Reinforcement ratios; Steel-concrete composite joints; Stiffness degradation; Structural Eurocodes|
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