Journal
THIN-WALLED STRUCTURES
Volume 169, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2021.108506
Keywords
Bond behaviour; Push-out test; Circular stainless steel tube; Internal ring; Ultimate bond stress; Strain distribution; Bond-slip model
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This study experimentally investigated the bond stress-slip relationship in CFSST structures and developed theoretical and empirical models to predict and analyze the behavior. These models can serve as input data for analytical and numerical simulations in future studies of CFSST structures.
The paper reports an experimental investigation on the bond stress-slip relationship in concrete-filled stainless steel tube (CFSST) structures. Push-out tests were conducted on twelve specimens covering two stainless steel grades, two concrete grades, two cross-sectional dimensions and two internal ring conditions (with and without the internal ring). The effects of these factors on the bond stress-slip relationship in CFSST members were analysed and discussed. A theoretical model, based on the assumption that no restraining force from the steel tube was applied to the concrete core, was developed to predict the bond stress-slip response of CFSSTs and was evaluated against the test results. An empirical model was also proposed based on regression analysis to replicate the experimental bond stress-slip relationships, which can be used as input data for analytical and numerical simulations in future studies of CFSST structures.
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