In order to investigate a method for joining concrete and the permanent form made of fiber reinforced cement, the shearing stress transfer properties between concrete and GRC (glass fiber reinforced cement) panel which has deformed surface, was examined by single shear test and numerical analysis. The adequate shear strength which was a load divided by length of specimen, was proposed as a parameter to measure the shearing strength on the joining interface between concrete and GRC panel. As a result, the width of the rib on joining interface had an influence upon the shearing stress transfer properties. It was made clear that putting a rib which has better width to joining interface of GRC panel was an effective method to improve the joining performance between GRC panel and concrete. In this study the appropriate width of the rib on GRC panel was from 0.7 cm to 1.0 cm (when deformed surface of GRC panel was a depression) and above 0.5 cm (when deformed surface of GRC panel was a.convexity).
