Influence of Lap Splices on the Deformation Capacity of RC Walls. II: Shell Element Simulation and Equivalent Uniaxial Model
Publication: Journal of Structural Engineering
Volume 143, Issue 12
Abstract
Spliced longitudinal reinforcement may result in a reduction of both strength and displacement capacity of reinforced concrete (RC) members. This applies in particular when lap splices are located in regions where inelastic deformations concentrate, such as the plastic zone at the base of RC walls. This paper introduces a simple numerical model suitable for engineering practice to simulate the force-displacement response of RC walls with lap splices. Based on experimental data from 16 test units, an equivalent uniaxial steel stress-strain law is proposed that represents the monotonic envelope of the cyclic response of spliced rebars in RC walls up to the onset of strength degradation. It allows for modeling lap splice response with finite element (FE) models while avoiding the use of complex interface bond-slip elements. A new semi-empirical expression for the strain at the onset of strength degradation is derived, which expresses the strain capacity of the lap splice as a function of the confining reinforcement ratio and the ratio of lap splice length to shear span of the wall. The proposed equivalent constitutive law was included in shell element models to predict the force-displacement response of the test unit set of RC walls. Results demonstrated the ability of this approach to adequately capture the peak strength and displacement capacity of the spliced units.
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Acknowledgments
The financial support by the Stiftung zur Förderung der Denkmalpflege of the project “Erbebenverhalten von bestehenden Stahlbetongebäuden mit dünnen Wänden” and by the Swiss Federal Roads Office (FEDRO) to the project number AGB 2015/002, under which the present study was partly carried out, are acknowledged.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 12 • December 2017
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©2017 American Society of Civil Engineers.
History
Received: Oct 3, 2015
Accepted: Mar 23, 2017
Published online: Sep 19, 2017
Published in print: Dec 1, 2017
Discussion open until: Feb 19, 2018
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