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Earthquakes and Structures Volume 5, Number 5, November 2013, pages 527-552 DOI: http://dx.doi.org/10.12989/eas.2013.5.5.527 |
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Yield penetration in seismically loaded anchorages: effects on member deformation capacity |
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S.P. Tastani and S.J. Pantazopoulou
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| Abstract | ||
| Development of flexural yielding and large rotation ductilities in the plastic hinge zones of frame members is synonymous with the spread of bar reinforcement yielding into the supporting anchorage. Yield penetration where it occurs, destroys interfacial bond between bar and concrete and reduces the strain development capacity of the reinforcement. This affects the plastic rotation capacity of the member by increasing the contribution of bar pullout. A side effect is increased strains in the compression zone within the plastic hinge region, which may be critical in displacement-based detailing procedures that are linked to concrete strains (e.g. in structural walls). To quantify the effects of yield penetration from first principles, closed form solutions of the field equations of bond over the anchorage are derived, considering bond plastification, cover debonding after bar yielding and spread of inelasticity in the anchorage. Strain development capacity is shown to be a totally different entity from stress development capacity and, in the framework of performance based design, bar slip and the length of debonding are calculated as functions of the bar strain at the loaded-end, to be used in calculations of pullout rotation at monolithic member connections. Analytical results are explored parametrically to lead to design charts for practical use of the paper | ||
| Key Words | ||
| bond; slip; yield penetration; seismic assessment; drift; rotation capacity; repair | ||
| Address | ||
| S.P. Tastani: Department of Civil Engineering, Democritus University of Thrace (DUTh), Vas. Sofias 12, 67100, Greece S.J. Pantazopoulou: Department of Civil & Environmental Engineering, University of Cyprus, Nicosia 1687, Cyprus | ||