EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTY OF PULLING CFRP BELT WITH WAVE-SHAPED-GEAR CLAMP AND DESIGN OF CLAMP SYSTEM

Based on the analyses of the stress of a pulling CFRP belt with a wave-shaped-gear (WSG) clamping, this paper theoretically proposes the modification in the theoretical elongation of the CFRP belt and the computation of the axial and shear forces in the screw bolt of the WSG clamping. Aimed at those three problems, two types of experiments are designed to study the WSG clamping for a pulling CFRP belt. One type test is only pulling a CFRP belt on a steel beam dado; another type test is a reinforced concrete T-beams strengthened with a pulling CFRP belt. The results of tests indicate that the reduction factor can be used to evaluate the modification of theoretical elongation in a CFRP belt under pulling with a WSG clamping; when the CFRP belt is pulled with a WSG clamping, the ratio of the axial force of the screw bolt to the pulling force of the CFRP belt is fixed, which can be used to monitor the pulling force of the CFRP belt in existing strengthening methods. The design shear force and design axial force of the single screw bolt are proposed in this paper as well.