Title:
Tensile Lap Splices Under Static Loading: A Review of the Proposed ACI 318 Code Provisions
Author(s):
Tel Rezansoff, Adeniyi Akanni, and Bruce Sparling
Publication:
Structural Journal
Volume:
90
Issue:
4
Appears on pages(s):
374-384
Keywords:
anchorage (structural); bond; confined concrete; lap connections; reinforced concrete; standards; static loads; tension; Design
DOI:
10.14359/3979
Date:
7/1/1993
Abstract:
A review of several available and proposed methods for designing tensile lap splices is made by examining results of recent tests in which confinement provided to the lap length was varied over a wide range. The results show that the tensile loading bond provisions proposed by ACI Committee 318, Subcommittee B, to replace provisions contained in the ACI Building Code (ACI 318-89), provide the basis for consistent design for all levels and combinations of confinement. With the minimal confinement available when bar covers and spacings are tight, and stirrups are either very light or absent, the proposed simple design approach provided a safe estimate of the test strengths. For intermediate and heavier confinement, where the proposed refined design approach of ACI 318 Subcommittee B can be used to reduce required anchorage lengths, an increase in the coefficients defining the factor of safety is warranted on the basis of the test data presented. On the other hand, the level of total confinement that can be considered effective should be increased. The consequence of the first change is to increase development lengths for low to intermediate levels of confinement, while the second change maintains or even reduces development lengths for heavy confinement, relative to the requirements of the refined design approach.