| The seismic resilience capacity of structure has become the priority of seismic research.The prefabricated concrete structure has the characteristics of fast construction speed and economy,but fully prefabricated concrete structure has deficient lateral stiffness and seismic performance due to the use of dry-type connections.Y-eccentrically steel brace can significantly improve the ductility and energy dissipation capacity of prefabricated reinforced concrete frame structure.However,there are some problems such as the severe damage of connection between concrete frame beam and shear link,and the difficulty in replacing it after earthquake,the connection between concrete beam-column and steel braces is easily damaged under the influence of axial force,shear force and bending moment.Therefore,in order to realize the expected performance of Y-eccentrically steel brace in fully prefabricated concrete frame,it's important to focus on the connection between shear link and fully prefabricated concrete frame beam,the connection between fully prefabricated concrete beam-column and steel braces.The main contents of this paper are as follows:(1)Based on the mechanical property of the shear link and the fully prefabricated concrete beam,A through high-strength bolts connection and a separated shear force-bending moment connection between shear link and concrete frame beam are proposed.And the mechanical property of the new connections is investigated by the verified finite element analysis method.For the through high-strength bolts connection,the influence of bolt pretention,bolt diameter and concrete strength on mechanical property are investigated.For the separated shear force-bending moment connection,the influence of concrete strength,shear connector length,vertical plate heights on both sides and bolt spacing on the mechanical property of connection under the common action of shear force and bending moment are studied.(2)A new type connection between fully prefabricated concrete beam-column and steel braces is proposed.The connection is designed by pan-uniform force method.After that,the mechanical property of new connection when it reaching the limit of inter-story drift ratio in rare earthquakes is analyzed.And the influence of shear area,sectional dimension,bolt diameter,concrete strength on its mechanical properties is investigated.(3)Seismic analysis of a twelve-story fabricated concrete frame with Y shaped eccentrically steel brace is carried out,in which the key parts adopt the separated shear force-bending moment connection and the fully prefabricated concrete frame beam-column-steel brace connection..And compared with fabricated concrete frame which the Y shaped eccentrically steel braced pan assembled without hinges.Under the earthquakes,the inter-story drift ratio of the structure meets the requirements of the limit value,and shear link is the first seismic defense line to achieve the function of "fuse".Using the new connections mentioned above can ensure that there is no plastic hinge at the key points and the structure can meet the expected seismic fortification target. |
PDF Full Text Request