Nonlinear truss modeling and strain-based evaluation of RC walls considering lap-splice failure effects

This paper presents a simulation-based method to evaluate the seismic performance of RC walls with lap splices. Computational analyses are conducted using a recent implementation of the nonlinear truss model. The uniaxial steel law used in the truss model is modified to account for lap-splice failure of vertical bars using a simple tensile strain criterion. Performance evaluation is conducted using a novel method that employs strain limits associated to damage in concrete and steel. The computational models and strain-based evaluation method are verified with experimental data from tests on wall components with lap splices at their base. Truss models are shown to accurately capture the force-displacement response and failures observed in these tests. The proposed evaluation approach allows for consideration of the post-yield capacity of lap-spliced bars, and the strain-based limits are shown to be consistent with the strength and stiffness deterioration of the walls.The study presented in this paper was supported by the National Institute of Standards and Technology (NIST) under award No. 70NANB19H060. Any opinions and findings presented in this paper are those of the authors alone, and do not necessarily reflect the opinions of the sponsor.Postprint (published version