Precast concrete composite structure with the advantages of definite force transmission, good integrity, safe and reliable, simple structure, convenient construction and saving materials, is a broad developing building structure. Precast concrete composite structure has obvious economic benefits and superior performance. With the development "s industrialization of construction" and "residential industrialization" in the process of accelerating in our country and the continious decrease of "demographic dividend" and the construction industry labor shortage is becoming more and more serious, the residential industry trend gradually clear day by day. The application of prefabricated concrete structure has gradually become the research hotspot of experts and scholars. Residential buildings with assembled concrete structure of new technology and new forms have emerged in all parts of the country. It is an important developing direction of building structures in China. This structure is conducive to the further development of building industrialization and increases the production efficiency. Node is a difficult problem of precast concrete composite structure in practical application. It restricts the structure can be made full use of, promoted and applicated in Engineering or not. Node design is a key link of prefabricated concrete structure, which needs further research and exploration. The study of the nodes has been widely at home and abroad, but there are still many deficiencies. Dynamic performance of the node is not only the key to the design, but is one of the difficulties of construction also.So, this paper presents a node called the ladder-plate-type prefabricated concrete node which is convenient for construction in practical engineering. And low cyclic loading test is done and the mechanical properties of the node is researched.To study the seismic performance of the new designed node. Full-scale models of different concrete strength and the thickness of the steel plate are studied through in the anti-seismic experiment. And low cyclic loading is on the specimen. Through the analysis of test data which is obtained the bearing capacity, stiffness degradation, strength degradation, energy dissipation coefficient and the other seismic index, the change rule of that is studied.The result shows that hysteretic curves were very similar in spindle before the ends of the beam yielded.And after the plastic hinge of the ends of the beam faild, one end of the hysteretic curve tended to bow and the bending deformation appeared too early because of anchoring improper on the other end. As a result,both ends of the curve were not symmetrical. Specimens have high bearing capacity and energy dissipation capacity, and the strength and stiffness degradation is not obvious. The specific rules is that when other things are equal,the higher the concrete strength,the bigger the bearing capacity,energy dissipation coefficient and the seismic performance of the assembly type concrete composite joint. A similar situation is that the thicker the steel plate, the bigger the bearing capacity,energy dissipation coefficient and the seismic performance.The prefabricated concrete joint connectivity is the weakest and most critical part in the loading process. In order to study the stress-strain distribution of the ladder-plate-type prefabricated concrete joint, the quasi-static cyclic test of the models with different concrete strength and different steel plate thickness was performed. The results show that horizontal stress and strain of the cross-joint -core steel plate is far greater than longitudinal stress and strain. Strain of up-ladder steel bar is far greater than that of the below-ladder steel bar. The stress and strain of reinforcement of the joint core zone is samaller than that of the cross-joint-core steel plate. This shows that the stress of reinforcement of the joint core zone is lower than that of the cross-joint -core steel plate in the loading process and changing rate of the strain of stirrups is greater than that of longitudinal reinforcement. Stress and strain’s change of the external beam concrete field is similar and stress and strain of compressive zone is far greater than the tension zone.The higher the concrete strength is, the smaller the stress and strain of the reinforcing steel bar in the ladder-plate-type prefabricated concrete joint will be; The thicker the cross-joint -core steel plate is, the smaller the stress and strain of the reinforcing steel bar and steel plate will be while keeping other parameters constant. |