Abstract
Shear is transferred through interface between two concrete members by two mechanisms either by aggregate interlock or by dowel action or by both in the same time. This media is very complex and there are so many variables affecting shear transfer like surface shape and final treatment of the concrete surfaces. Histories of the previous researchers are mentioned in this paper to find out the applicable results of their equations. It is noticed that most of them depend on only clamping stress due to dowel action while others used besides that the type of concrete used namely its compressive strength. A mathematical statistical trials are made in this paper to find out the most accurate and suitable equation which simulates the action happened in this media. An equation of six parameter polynomial is obtained containing clamping stress and compressive strength of concrete. Assumed values of the mentioned variables are used in this equation to find out the horizontal shear strength. The deviation recorded is about 4% which is an acceptable one.
