Abstract
The slip strength of perfobond strip is effected by several confinements restraining concrete fracture around a hole. This paper presents the several confinement factors in slip tests and a method evaluating the ultimate slip strength caused by concrete fracture. It is concluded that the confinement factors are the concrete covering of the connector, the reinforcing bars perpendicular to the connector plate such as rebars set through or near the hole of the perfobond strip, etc., and also the friction force between specimen and test bed in the case of push-out tests. The slip strength of perfobond strip can be evaluated accurately by the method proposed herein which takes each confinement effect into account.
