Seismic Behavior Of A New Type Of Energy Dissipation Prefabricated Shear Wall Joint Under Different Axial Compression Ratio

The new type of energy-dissipating vertical shear wall structure USES metal dampers to connect the vertical joints of the prefabricated shear wall,so as to weaken the overall stiffness of the shear wall and consume part of the seismic energy through the dampers,so that the shear wall can not only meet the requirements of bearing capacity under small earthquakes,but also reduce the risk of collapse of the shear wall under large earthquakes.It is very convenient to place the damper in the vertical joint of the assembled structure,and it is also very convenient to replace it,which is conducive to the promotion and application of the structure.A new type of energy-dissipating vertical joint shear wall with different flanges and different joint width is taken as the research object,and the low-cycle reciprocating horizontal loading test and finite element analysis are carried out respectively.The main research contents are as follows:1)Two groups of 6 new energy-dissipating prefabricated vertical joint shear wall specimens with different flange forms and one one-type cast-in-situ common wall specimen were made for the test.Under the action of low cyclic reciprocating load,the seismic performance of the specimens under different coaxial pressure ratios(0.1,0.3),such as the bearing capacity,energy dissipation and failure mode,and so on,were studied.2)On the basis of experiment,the finite element software ABAQUS is used to establish a new type energy dissipation prefabricated vertical slit shear wall model,analyzes its in 0.1,0.3 and 0.5 under the axial compression ratio of the seismic performance,in addition to one word cast-in-place shear wall model is established and a type vertical slit open without damper shear wall model,analysis of the seismic performance under axial pressure ratio 0.1.The research shows that: with the increase of axial pressure ratio,the bearing capacity of energy dissipation wall increases by 6.2% to 28.3%,and the overall stiffness increases by 26.5% to 49.7%.Both deformation capacity and energy dissipation index decrease,and the relative displacement of damper in vertical joints decreases.Under the action of horizontal reciprocating load,the damper in the vertical joint does not appear out of plane deformation,providing a reliable and stable connection,and yielding before the wall,realizing the energy input before the wall to reduce the damage degree of the main structure;The new type of energy-dissipating prefabricated vertical shear wall has good overall seismic performance.The ductility coefficient of the energy-dissipating wall is basically above 3,with the maximum energy reaching 4.9.The dampers in the vertical joints can transfer the shear force effectively,and the deformation and energy dissipation capacity of the energy-dissipation wall are better than that of the ordinary cast-in-situ shear wall under the condition that the bearing capacity is hardly reduced.Figure 41;Table 29;Reference 51...