This paper investigates the influence of time-dependent bond slip on the delayed failure of RC frames. The time-dependent model of bond slip is formulated based on the mechanism of subcritical damage accumulation along the steel-concrete interface. A kinetic model of the time dependence of slip under sustained loading is developed through numerical simulations. The model is incorporated into a recently developed reduced-order numerical model for simulations of the progressive collapse of RC frames. It is shown that the present model captures the essential deformation mechanisms of the frame under both monotonic loading and sustained loading, and that the time dependence of bond slip has a profound influence on the delayed failure of RC frames, especially under moderate sustained loading. This finding highlights the importance of understanding and accounting for the time dependence of bond slip for future study of the delayed progressive collapse of RC structures.
|Original language||English (US)|
|Journal||Journal of Engineering Mechanics|
|State||Published - Sep 1 2022|
Bibliographical noteFunding Information:
We acknowledge the University of Houston’s Hewlett Packard Enterprise Data Science Institute for providing computational and IT resources for this work. RB acknowledges support from the Thomas and Laura Hsu Professorship.
© 2022 American Society of Civil Engineers.