Structural Design And Seismic Performance Analysis Of A New Type Of Energy-dissipation Shear Walls With BRB

Based on the research of the lightweight shear wall with herringbone brace which was proposed by our research group,the energy-dissipation shear wall is designed with the buckling restrained braces(BRB)to replace the original concrete braces,which not only can reduce weight,but also improve the energy consumption performance and seismic performance of the shear wal.In this paper,the OpenSEES program is used to design and analyze the energy-dissipation wall with BRB,the time-history analysis on the seismic performance of the high-rise shear wall structure,in which part of shear wal s is replaced by energy-dissipation wall with BRB.The main contents are as follows:Firstly,the numerical simulation was carried out for the BRB presented in the existing literature under horizontal low-cycle repeated loads.Compared with the experimental results,hysteresis curves,sk Eleton curves and the rElated mechanical characteristic values of the simulation results were found to be in good agreement with the experimental results,which can provide the basis for subsequent BRB design and analysis.And then the applicability of the shear wall mod El based on fiber beam column Element and layered shEll Element in OpenSEES was analyzed.Three shear wal s with height-width ratios of 1,1.5 and 2,respectivEly,in the existing literature were simulated and analyzed.It is suggested that the fiber beam column Element can be used to analyze the energy-dissipation and seismic performance of the shear wallThen,a piece of energy-dissipation shear wall with BRB JL1 was designed for a practical engineering program.The influences of the height and width of the opening and the angle of BRB on the performance of the wall was studied.The location of the opening was analyzed by changing the size of the shear wal.A reasonable size of opening in the energy-dissipation shear wall with BRB is suggested to capture rElativEly better bearing capacity and ductility.The influence of axial compression ratio on the seismic performance of the wall was analyzed.The energy-dissipation shear wall with BRB,which is designed reasonably,would achieve the first yiEld of BRB and a stable bearing capacity,and the energy dissipation performance is much better than that of ordinary RC shear wal.Finally,the ordinary RC shear wal s of the 4-10 floors in the 10-floors high-rise shear wall structure were replaced by the presented energy-dissipation shear wal s.The modEl created in the ETABS was imported into OpenSEES for dynamic analysis.The modal frequency analysis shows that the overall stiffness of the energy-dissipation shear wall with BRB structure is very close to that of the ordinary shear wal.The timehistory analysis was conducted on these two kinds of shear wall structures under the earthquakes of 7,8,9 degrees.The result shows that under strong earthquakes,the maximum displacement at top point and maximum displacement between adjacent floors for BRB energy-dissipation shear wall structure are less than that of ordinary shear wall structure.Especially for the 8-degree rare earthquake,the maximum displacement between adjacent floors of the ordinary shear wall structure has exceeded the standard limit,but that of the BRB energy-dissipation shear wall structure can meet the seismic requirements.The first-yiElding mechanism of BRB could consume some seismic energy,which would make the structural performance improve.