Cyclic Tests on Concrete Reinforcement for Development of Seismic Bond Model

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Title: Cyclic Tests on Concrete Reinforcement for Development of Seismic Bond Model

Author(s): Christoph Mahrenholtz and Rolf Eligehausen

Publication: Materials Journal

Volume: 114

Issue: 04

Appears on pages(s): 571-579

Keywords: anchorage; bond failure; bond model; development; earthquake; post-installation; reinforced concrete

Date: 7/1/2017

Abstract:
The load transfer within joints of reinforced concrete elements can strongly influence the behavior of the structure. Additionally, cracks play an important role—they develop due to bending-induced tensile stresses in concrete and meander along the starter bars anchored in joints. The performance of joints becomes even more relevant under seismic loading conditions, whereby the reinforcing bars are subjected to cyclic loading and, at the same time, cyclic opening and closing of the cracks intercepting the starter bars. Such load and crack cycling may significantly influence the load and displacement capacity of starter bar anchorages. Experimental tests were carried out to verify a generic bond model to describe the bond stress-slip relationship under these seismic conditions. This seismic bond model should allow the realistic numerical simulation of seismically loaded reinforced concrete structures even if joints are designed with starter bars shorter than the development length.