| High-rise and super-high-rise buildings are becoming the main form of urban architecture.Shear walls and core tube shear walls are the first seismic lines of defense for high-rise and super-high-rise buildings.They bear most of the horizontal seismic forces and are very vulnerable to earthquakes.Seriously damaged.The typical earthquake damage of the traditional shear wall is the shear cracking of the wall body and the instability of the wall toe crushing.The failure mode is brittle and difficult to repair after the earthquake.Therefore,high-rise and super-high-rise buildings are often in an embarrassing situation where earthquake damage is difficult to repair or the repair cost is extremely high.Demolition and reconstruction also cause great waste of resources and social impact,making the city long-term affected after a severe earthquake and difficult to recover urban functions quickly.In order to overcome the problems of shear cracking of the shear wall and crushing of the toes of the shear walls in high-rise and super-high-rise buildings,this paper conducted experiments and theoretical studies.Vertical wave steel plate combined shear wall is used to overcome the problem of seismic damage caused by severe cracking of the wall surface of shear wall.At the same time,in order to overcome the problems of wall toe crushing and difficult recovery of post-earthquake shear wall,a recoverable vertical wave steel plate combined shear wall with replaceable tension and compression dampers installed on the wall toe is proposed to further protect the shear The main body of the force wall,the concentrated plastic strain and the energy dissipation web of the replaceable damper.After the earthquake,the seismic performance of the structure is quickly restored by replacing the wall toe damper.In this paper,the vertical wave steel plate combined shear wall constrained by H-shapedsteel and the vertical wave steel plate combined shear wall constrained by embedded steel frame and square steel tube and the recoverable function of the replaceable tension and compression damper under the square steel tube The wave steel plate composite shear wall specimens were tested for the seismic performance and seismic toughness of the vertical wave steel plate composite shear wall and the recoverable functional composite shear wall.The main research contents and results are as follows:(1)Determining the test standard of recoverable function and seismic toughness: Taking the limit of the elastoplastic displacement angle of the shear wall structure in the relevant specifications as the limit,load the structure to the displacement angle of 1/80,for the structure before this limit Judgment of earthquake damage phenomena and seismic performance.(2)The quasi-static loading seismic performance test was carried out on the vertical wave steel plate composite shear wall constrained by H-shaped steel and its embedded steel bone.The elastoplastic displacement angle had a hard-to-repair seismic damage before the limit,and the structure was disposable.Load to failure to study the seismic performance;load the vertical wave steel plate combined shear wall constrained by the square steel pipe to the elastoplastic displacement angle limit,the earthquake damage is weak,and it has the potential for functional recovery after the earthquake.(3)The vertical wave steel plate combined shear wall constrained by the square steel tube is considered to have experienced a rare earthquake after a standard elastoplastic displacement limit loading.Repair the earthquake-damaged composite wall,transform the wall toes and install replaceable tension and compression metal dampers to form a recoverable functional composite shear wall.(4)Load the recoverable functional combined shear wall to the limit of elastoplastic displacement angle,replace the wall toe damper and reload until the structure is destroyed.The load-displacement curves of the two loads almost completely overlapped,and the bearing capacity and displacement characteristic points,stiffness-displacement curves and energy dissipation capacity curves also almost completely coincided,indicating that the recoverable functional vertical wave steel plate combined shear wall can achieve post-earthquake functional recovery And seismic toughness.(5)Compare the seismic performance of the recoverable functional vertical wave steel plate composite shear wall subjected to multiple loading and the H-shaped steel constrained vertical wave steel plate composite shear wall.It was found that after the installation of replaceable dampers,the bearing capacity of the recoverable functional vertical wave steel plate composite shear wall was slightly lower than that of the H-steel-constrained vertical wave steel plate composite shear wall,and their peak points differed by 11%,but the deformation performance was better.Among them,the limit displacement is 1.34 times of the H-steel constrained vertical wave steel plate composite shear wall,the length of the descending point from the peak point to the limit point is 4.1 times of the H-steel constrained vertical wave steel plate composite shear wall,and the ductility is H-type steel constrained The vertical wave steel plate combined shear wall is 1.64 times.(6)Through the finite element software ABAQUS,the test process was simulated and verified.The finite element cloud image shows that the damper can concentrate stress,plastic strain and replaceable damper energy dissipation web to protect the shear wall body after the earthquake.Quickly restore the seismic performance of the structure by replacing the wall toe damper.In addition,after verifying the correctness of the model,the parameters of the test piece were extended,and the shear capacity formula of the flat steel plate-concrete composite shear wall in China's "Code for Design of Composite Structures" was revised according to the simulation results to obtain vertical waves Design formula of shear capacity of steel plate composite shear wall and recoverable functional composite shear wall.Compared with the test results,the error is less than 10%,which can provide a reference for the calculation of the elastoplastic shear capacity and maximum shear capacity of the vertical wave steel plate composite shear wall and the recoverable functional composite shear wall. |
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