Confinement Limits For Tensile Lap Splices Under Static Loading
Date
1991-11
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ORCID
Type
Degree Level
Undergraduate
Abstract
ABSTRACT
In tension lap splices, the benefit provided to the lap by stirrups placed to intercept cracking due to bond splitting action is recognized by the American Concrete Institute (ACI 318-89) and the design recommendations of the ACI Committee 408, on which the American code provisions are partially based. However, a limit exists on the benefit that can be derived from this confinement. In Canada, CSA Standard CAN3 A23.3 M-84, does not directly recognize the confinement benefit provided by stirrups along a lap splice.
The current study shows that the ACI limit of one bar diameter of equivalent concrete cover provided by the transverse reinforcement confinement is too restrictive under static loading. When the concrete cover is small, much larger transverse reinforcement confinement, up to 2-2.5 bar diameters of equivalent concrete cover can be utilized, in lieu of requiring very long lap lengths. The tests also show that total confinement (actual concrete confinement plus equivalent concrete confinement provided by stirrups) is effective beyond the current limit of 3 main bar diameters, when stirrups are provided. Good performance was found with confinements of 4-4.5 bar diameters, and correspondingly shorter lap splice lengths.
Description
Keywords
Citation
Degree
Master of Science (M.Sc.)
Department
Civil Engineering
Program
Civil Engineering