自复位装配式可更换RC框架结构抗震性能试验研究OA

In order to improve the self-centering performance and post-earthquake repairability of prefabricated structures,a self-centering prefabricated replaceable RC frame(SF)was proposed.The frame is composed of prefabricated prestressed reinforced concrete beams,columns and other members spliced by high-strength bolts.The post-tensioned prestressed tendons provide the self-centering effect,and the replaceable energy-dissipation plates realize energy dissipation.Low-cyclic reciprocating loading tests of a self-centering frame with fixed column bases,a self-centering frame with rocking columns and a cast-in-place RC frame were completed.The effects of column base configuration and cross-sectional area of energy dissipation plates on the structural bearing capacity,deformation capacity,energy dissipation capacity and self-centering capacity were investigated respectively.The results show that the indirect tensioning method for steel strands in prefabricated prestressed beams is effective.The load-bearing capacity,energy dissipation capacity and self-centering capacity of the frame specimen with fixed column bases are 1.16 times,1.98 times and 0.64 times those of the self-centering frame specimen with rocking columns,respectively.After replacing the beam and column energy-dissipation plates with larger cross-sectional areas,the self-centering frame with rocking columns can achieve rapid recovery of its structural seismic function and even outperform the original performance.Compared with conventional RC frames,SF frames exhibit higher bearing capacity and self-centering capacity,and lower energy dissipation capacity.After the test,the main beam and column members of the self-centering frame with rocking columns show no significant damage,damage locations are controllable,and the function of the structure can be restored after the earthquake.