Experimental Study Of Prestressed Assembly Frame Structure Bearing Capacity

Concrete structure with prestressed precast high-strength prestressed reinforcement or steel strand by prestressing precast concrete members assembled at the construction site,the structure has the characteristics of prestressed concrete structure and the assembly structure of the two.Compared with ordinary concrete structure,it has good crack resistance,small deflection,deformation restoring capacity and makes full use of high-strength materials to reduce weight,factory production,wet operation less construction speed,energy conservation and so on.Based on the previous work in research group of different prestress and different beam reinforcement ratio subassemblage specimen bearing capacity of joints are selected as the object of study,involving 16 specimens,specimens are full-scale specimens of quasi static loading.The results show that the preloading stress has significant influence on the bearing capacity of the specimen,in a certain range,with the increasing of compressive prestress,assembly joints significantly increase the bearing capacity;but the beam reinforcement ratio on the bearing capacity of prefabricated specimen the effect is not significant,and the bearing capacity increase is not obvious.Additional damper specimen is additional energy dissipation capacity of the angle steel plate specimens more strong,prestress will decrease with the increase of specimen energy dissipation capacity,and increase the beam reinforcement ratio will increase the energy dissipation capacity of the specimens.In a certain range,the increase of reinforcement ratio and pre test parts compressive stress is beneficial to improve the overall stiffness.Based on the theory of computing in the test and analysis,the overall performance of the node,proposed relevant content concrete design specification of precast beam column joints are calculated,the calculation results are consistent with the actual value.In this paper,the design of the additional angle plate and additional damper device can increase energy consumption,nodes in a certain extent specimen seismic performance,can be widely used in practical engineering.