Study On Seismic Behavior Of Fabricated Groove Joint Concrete Frame Structure

The important step in the development of green building is to "promote the rational development of building industrialization".It has become a trend to vigorously promote the development of assembly building and building industrialization.As a common structural form,how to ensure that the assembled Liang Zhu joint connection area has better seismic performance and make it not earlier than other members in the earthquake is of great significance to the safety of the whole structure.Structural safety is the basis of building structural design.As an important force transfer part of the frame system,the joint should ensure good performance.Under the action of earthquake,the joint of assembled structure is the most vulnerable to damage,and the joint has a great influence on the overall performance of the structure,and the research on the seismic performance of assembled frame structure joints is also particularly important.This paper takes a three-story two-span frame structure as the research object,establishes the analysis model by using the finite element analysis software ABAQUS,selects the reasonable parameters,and establishes two models of one three-story two-span assembled frame structure.The first groove joint is located at the end of the beam,the second groove joint is set at the distance from the joint 800mm,the joint and the column are prefabricated as a whole,and the cast-in-situ structural model with the same section size and reinforcement ratio is established.The seismic performance of the whole assembled frame structure with slot joints in different positions is compared and analyzed.The main research contents are as follows:(1)The quasi-static analysis of cast-in-place frame structure and two kinds of assembled structures with slot joints in different positions is carried out,and the seismic performance of the structure is analyzed by hysteretic curve,ductility,stiffness,energy dissipation capacity and so on.The results show that the average ductility coefficient of cast-in-place structure and two kinds of assembled structure are 2.46mm 2.25mm and 2.39mm,respectively,and the ductility of the second kind of assembled structure is better than that of the first kind of assembled structure,and the ductility of the second kind of assembled structure is better than that of the first kind of assembled structure.The energy dissipation performance of cast-in-place structure is the best,and the energy consumption of the first kind of assembly structure is the least.In the aspect of stiffness degradation,the stiffness degradation curves of the three kinds of structures are basically the same.The stiffness of cast-in-place structure is always larger than that of assembly structure,and the overall displacement of the structure reaches 60mm.The displacement curves of the three kinds of structures are similar,indicating that the stiffness of the three kinds of structures is similar.(2)The structural dynamic analysis of cast-in-place frame structure and two kinds of assembled structures with slot joints in different positions are carried out,and the seismic performance of assembled structures is analyzed by studying structural displacement response and interstory displacement angle.The results show that under the action of different seismic waves,the trend of the displacement time-history curve of the three kinds of structures is about the same,that is,under the same earthquake action,the displacement responses of the three kinds of structures are about the same.The displacement of the assembled structure is larger than that of the cast-in-place structure.The displacement of the first kind of assembled frame structure is the largest and the displacement of the cast-in-place frame structure is the smallest.(3)Finally,this paper makes a comprehensive analysis of the quasi-static and dynamic results of the frame structure model.The seismic performance of the two kinds of assembled frame structures is close to that of the cast-in-place frame structure,and some of the seismic performance parameters are even better than that of the cast-in-place frame structure.This paper puts forward some reasonable suggestions for the design and construction of Liang Zhu joint assembly scheme.