Confinement Limits For Tensile Lap Splices Under Static Loading

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.

Name thesis:degree_name

Master of Science (M.Sc.)

Level thesis:degree_level

Undergraduate

Discipline thesis:degree_discipline

Civil Engineering

Grantor

University of Saskatchewan

Year dc:date.issued

1991

Author dc:creator

• Konkankar, Uday S

Handle dc:identifier.uri

https://hdl.handle.net/10388/14735

OAI identifier oai:identifier

oai:harvest.usask.ca:10388/14735