Evaluation of the Bond Stress Transfer Mechanism in CFSTs

Abstract This paper studies the non-linear distribution of bond–slip behavior in steel concrete interface a Concrete Filled Steel Tube (CFST). Specifically, it concerns regions geometric discontinuity occurring composite beams CFST column-frame connection points. The study was conducted through an analytical model that represented bond stress transfer mechanism within these areas. resulting deductions were drawn up on basis elasticity theory and relationship between jacket confined concrete. highlights how proposed here able to obtain, not only closed-form expression transferring length involved CFSTs but also expressions stresses strains. In addition, procedure obtained slip trend above-mentioned for rectangular circular filled tubes. use this resulted calculation ultimate load CFSTs. paper, predictions compared with experimental results from 97 tests carried out tubes (CCFTs) 35 (RCFTs). have been found be most accurate uniform comparison those models by other authors Eurocode. With reference experimental-to-analytical value ratio, AVG COV values are 0.86 0.42, 1.06 0.57 CCFT RCFT analyses, respectively.