| Abstract: | To investigate the mechanical properties and failure mechanism of BFRP-plate-reinforced composite double coupling beam, one ordinary reinforced concrete coupling beam, one ordinary reinforced concrete double coupling beam, one plate-reinforced composite double coupling beam and one BFRP-plate-reinforced composite double coupling beam were tested under cyclic loading. The influences of different types of coupling beams and BFRP sheets on the seismic behavior of the specimens were investigated. The failure process, failure modes, bearing capacity, deformation capacity and energy dissipation capacity of the specimens were studied. The strain distribution of the BFRP sheets varying with displacement and time was analyzed by using the digital image correlation (DIC) testing technology. The results indicate that the ductility, energy dissipation and bearing capacity of the double coupling beams with steel plate and BFRP sheets are significantly improved. The addition of steel plate significantly improves the bearing capacity and energy dissipation capacity of the ordinary reinforced concrete double coupling beam. The BFRP sheets can effectively improve the load carrying capacity of the plate-reinforced composite double coupling beam, suppress the development of concrete cracks and postpone the damage to the concrete. DIC testing technology can be used to measure the deformation and strain of BFRP sheet. The force of BFRP sheet near the beam-wall joints is larger. |
