Experimental Research For Reinforced Concrete Beam Strengthened With Prestressed CFRP-lamina

Comparing with the flexural capacity of the concrete beam gluing to the CFRP reinforces, the prestressed CFRP (PCFRP) can effectively make use of the high intensity of the CFRP, save the dosage of the CFRP, control the distortions and cracks. Its advantages are obvious. Anyhow, the problems referred to PCFRP are huge and complicated, because the concrete beams strengthened with PCFRP are related closely with the material characteristics of the CFRP and the stick colophony, shrinking performances of the concrete, the method of adding prestress, the stick performances of the CFRP-lamina and the concrete, and the techniques of the anchoring and the sticking. Based on the characteristics of the concrete beams strengthened with PCFRP, the actuality and the existent problems of studying and applying.This paper we study the straining and the anchoring method of CFRP and we study the flexural performance strengthening the simple beam with prestressed CFRP-lamina.This paper studies the following problems:1. The effective jointing length of the prestressed CFRP-lamina and the concrete and the anchoring method. Experimentally, we study the effective jointing length of prestressed CFRP-lamina and the concrete, and then, we bring forward the anchoring method of prestressed CFRP-lamina on the concrete. Secondly, we take the method back to the experiment to make sure that it is reliable and effectually.2. The performances of the anchoring stick of prestressed CFRP-lamina and the concrete.The stick intensity of the binding surface of the prestressed CFRP-lamina and the concrete is the key factor affecting the performances of the strengthened structure.According the experimental, systematically answer to such as whether the strain of prestressed CFRP-lamina can effectively bring to bear on the concrete structure by anchoring stick? How much effective prestress can be brought to bear on the concrete structure? How much prestress it lost? And we will analyze and conclude the performances of the anchoring stick of the PCFRP and the concrete by inspecting the changes of stress of prestressed CFRP-lamina and the concrete structure through straining and un-straining the prestressed CFRP-lamina.The flexural effect of strengthening the simple beam with prestressed...