ABSTRACT
With the increase of the service time of concrete structure, the bearing capacity of the structure will decrease to a certain extent. In order to ensure that the structure meets the needs of serviceability state, the structure needs to be reinforced and transformed to improve the bearing capacity. In this paper, the method of carbon fiber reinforced polymer strips-wrapped concrete beams is used to strengthen the concrete beam, and the calculation method of the shear bearing capacity is studied and analyzed. However, the shear behavior of reinforced concrete beams (RC) is complex. To analyze the shear capacity of RC beams strengthened with carbon fiber reinforced polymer (CFRP) strips, the main factors affecting the shear performance are summarized and analyzed based on existing literature firstly. Then, the calculation formula of shear capacity of CFRP is determined by regression analysis of test data and is verified with model tests. Finally, the applicability of the calculation model proposed by author is analyzed and compared with previous shear models. The results show that: (1) the main factors affecting the shear performance include the effective height of CFRP strips, the spacing of CFRP strips, the width and thickness of CFRP strips, the axial compressive strength of concrete, the inclination angle of crack of reinforced concrete beams and CFRP strips; (2) the shear capacity of RC beams strengthened with CFRP with previous calculation models are conservative, and the maximum error is 29.47%; (3) The calculation results of the model proposed by author are consistent with the test results of side obliquely pasted CFRP, and the error is 6.21%. But there is a large error with the test results of U-shaped pasted CFRP strips.
