Title:
Tension Development Length of Large-Diameter Bars for Severe Cyclic Loading
Author(s):
Juan Murcia-Delso, Andreas Stavridis, and P. Benson Shing
Publication:
Structural Journal
Volume:
112
Issue:
6
Appears on pages(s):
689-700
Keywords:
bond slip; cyclic loading; development length; finite element analysis; large-diameter bars; pull-push tests; reinforced concrete; reinforcing bars; reliability
DOI:
10.14359/51687937
Date:
11/1/2015
Abstract:
This paper presents a study on the tension development length of large-diameter reinforcing bars embedded in well-confined concrete. Pull-push tests were conducted on No. 14 and 18 (43 and 57 mm) bars to evaluate whether the development length requirements in the AASHTO LRFD Specifications are adequate for large-diameter bars subjected to severe cyclic loading. The data have been used to validate finite element models, which have been subsequently employed in a parametric study to establish a formula to determine the tensile capacity of a bar as a function of the embedment length, and the concrete and steel strengths. Monte Carlo simulations conducted with this formula have shown that the AASHTO requirements are adequate to develop the yield strength of a bar in tension, but they do not have the desired reliability to develop its ultimate tensile strength when uncertainties are considered. Hence, an improved development length requirement is proposed.