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http://dx.doi.org/10.4334/JKCI.2009.21.6.781

Determination of Steel-concrete Interface Parameters: Me chanical Properties of Interface Parameters  

Lee, Ta (Dept. of Civil Engineering, Konkuk University)
Joo, Young-Tae (R&D Center, MIDAS IT)
Lee, Yong-Hak (Dept. of Civil Engineering, Konkuk University)
Publication Information
Journal of the Korea Concrete Institute / v.21, no.6, 2009 , pp. 781-788 More about this Journal
Abstract
Mechanical properties of steel-concrete interface were evaluated on the basis of experimental observations. The properties included bond strength, unbounded and bonded friction angles, residual level of friction angle, mode I fracture energy, mode II bonded fracture energy and unbonded slip-friction energy under different levels of normal stress, and shape parameters to define geometrical shape of failure envelope. For this purpose, a typical type of constitutive model of describing steel-concrete interface behavior was presented based on a hyperbolic three-parameter Mohr-Coulomb type failure criterion. The constitutive model depicts the strong dependency of interface behavior on bonding condition of interface, bonded or unbounded. Values of the interface parameters were determined through interpretation of experimental results, geometry of failure envelope and sensitivity analysis. Nonlinear finite element analysis that incorporates steel-concrete interface as well as material nonlinearities of concrete and steel were performed to predict the experimental results.
Keywords
steel-concrete interface; interface parameter; Mohr-Coulomb failure criterion; confining pressure; interface finite element analysis;
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