Experimental Study On Deformation Of Precast Concrete Frame Structure Node Additional Damper

Prestressed assembly frame structure is a kind of new structure form of prefabricated beam and column members connected by prestressing tendons,anchors and tensioning equipment.This structure in some frame residential buildings,office buildings,largespan factory buildings,etc.are more widely used.Prestressed assembly structure has reduced labor force,improved construction speed,improved the use of machinery and equipment,and reduced the generation of construction waste.This research designed six edge nodes of low cyclic loading test,two different reinforcement cast specimens,four additional dampers with different reinforcement and different pre-stressed assembly specimens,using load-displacement loading system.According to test results,the hysteresis curves,skeleton curves,ductility coefficient table,the residual deformation and residual displacement table and stiffness degradation curve can be drawn,and it can also be used to analyse the six specimens under different reinforcement ratio and the pressure of deformation performance.Combined with the theoretical knowledge,the deformation formula of assembly structure is obtained and compared with the experimental data.The experimental results showed that the deformation restoring force of prestressed assemblies with additional dampers is better than that of cast-in-place specimens under low cyclic loading.Improving the specimen's reinforcement ratio and pre-pressure,can improve the bearing capacity of the specimen,deformation and restoring force.The specimen with additional dampers has high energy dissipation capacity,which is beneficial to earthquake resistance.The research accorded to the relevant formula of“Code for Design of Concrete Structures”(GB50010-2010),the deformation formula of assembly structure was obtained and compared with the experimental data.The results showed that there was a gap between the calculated results and the actual deformation curve.It is suggested that the beam stiffness is reduced by 35% after cracking,and the calculated load-displacement curve is close to the actual one.