Experimental Studies On Seismic Performance Of The Two-story Two-bay Energy-dissipative Precast Concrete Frame Structure

Since the second pouring part is in the precast concrete frame structure, the overall seismic performance of precast concrete frame structure is poor. The precast frame structures is presented in this paper, of which introduces the sector lead viscoelastic damper, and the "Energy dissipation suspension frame structure system" is put forward. In order to strengthen the framework node and Improved the seismic performance of precast concrete frame structure, based on the existing research results, the study of the energy dissipation suspension frame structure system is carried out in the form of test. The main content is showed as below:(1)Summarizes the current domestic and foreign research of prefabricated frame structure.There are more studies on the prefabricated frame structure joint but fewer on the overall.Considering the situation above, the experimental studies on seismic performance of two-story two-bay precast concrete frame structure was put forword.(2)Design two two-story two-bay precast concrete frame structure models with and without the sector lead viscoelastic damper, and one cast-in-situ frame structure model with sector lead viscoelastic damper. These three models were tested under the cyclic load in low frequency. The seismic performace of the energy dissiipation suspension frame structure system will be further studied through the comparison and analysis.(3)The installation method of the sector lead viscoelastic damper has been improved.Design the embeded part of prefabricated frame structure for damper, which makes the sector lead viscoelastic damper more appropriate to the practical structure.The comparasion of the three specimens includes the test phenomenon and failure mode,which shows that the sequence of plastic hinge and the stress pattern in the prefabricated frame strcuture is changed under the effect of the sector lead viscoelastic damper, and the beam-column joint of the structure is protected.(4)Analyze load-displacement curves, structural ductility, strength, stiffness degradation,energy dissipation and material strain of the three two-story two-bay concrete frame structure models were studied.The results showed that the sector lead viscoelastic damper provide extra stiffness, improve the performance of ultimate bearing capacity and ductility of the specimens,and the degradation of the structure strength and stiffness has been effectively inhibit. When the sector lead viscoelastic damper participate in the energy dissipation of the structure, the specimen hysteresis curve became full, and the capability of the energy dissipation was improved.