Research On Seismic Performance Of Double-barrel Circular Arc Energy Dissipation Supported Frame Structure

The lateral force resisting component plays the role of resisting horizontal loads such as wind load and seismic load in the building,which is the key to ensure the safety and reliability of the whole structure.Energy dissipation braced steel frame structure is the most widely used in high-rise steel structure buildings.However,under the action of earthquake,the support structure is prone to out-of-plane instability deformation,and the support instability will lead to the reduction of the lateral resistance and energy dissipation capacity of the structure.In order to avoid the out-of-plane instability of the cross-shaped support structure and the herringbone support structure,an arc-shaped energy dissipation structure is introduced at the support end.Under the action of earthquake,the arc-shaped energy dissipation structure first buckles to ensure that the support does not undergo out-of-plane deformation and improve the lateral resistance and energy dissipation capacity of the structure.In order to understand the seismic performance of the two structures,this paper will study the seismic performance of the above two structures under low cyclic loading.Based on the existing literature and the actual engineering design,this paper designs two kinds of cross-shaped support structures and herringbone support structures with curved energy dissipation members,and uses ABAQUS three-dimensional finite element software for numerical simulation analysis.The main research contents and results are as follows :(1)Abaqus software was used to simulate and analyze the existing tests and compare with the test results.Through comparative analysis,the error between the experimental data and the simulated data is less than 10%,which verifies the reliability and validity of the element model and materials in the finite element.(2)The finite element method is used to compare the seismic performance of the existing test model with that of the double-barrel circular arc energy dissipation support model.The results show that when the load Angle is 45°,the bearing capacity of the double-barrel circular arc structure is less than that of the supporting rods,which ensures that the supporting rods do not fail first in the loading process and improves the energy dissipation coefficient and seismic performance of the structure.(3)Finite element method was used to compare and analyze the deformation and stress distribution of the double-barrel circular arc energy dissipation support structure when the interlayer displacement Angle is 1/250 and 1/50.The results show that the stress and strain of the structure are concentrated in the double-barrel circular arc member,indicating that the double-barrel circular arc member has strong energy dissipation capacity.(4)The variable parameter finite element simulation was carried out on the cross-type double-barrel circular arc energy dissipation brace structure to compare the effects of different parameters on the seismic performance of the structure.The analysis shows that the bearing capacity of the structure increases by 16% and the energy dissipation coefficient increases by12% when the thickness of the slab increases by 4mm.Therefore,the thickness of the slab has the greatest influence on the seismic performance of the structure.The maximum value of the equivalent plastic strain of the structure is concentrated in the bi-circular arc rib,and the rib is the most prone to fracture.(5)The variable parameter finite element simulation of the herringbone double-barrelled circular arc energy dissipation support structure is carried out.The results show that compared with the existing experimental model,the double-barrelled circular arc component can avoid the instability of the herringbone structure,and the energy dissipation coefficient of the model is reduced by 26%.Increasing or decreasing the thickness of the ribs and decreasing the spacing of the ribs have a great influence on the seismic performance of the herringbone circular arc energy dissipation structure.When the inner and outer arc of the structure and the thickness of the ribs are increased,the stiffness of the supporting rods is insufficient,and the structure becomes unstable,resulting in large out-of-plane deformation.According to the above research and analysis,the double cylindrical arc member can improve the seismic performance of the structure and enhance the stability of the structure.The thickness of the rib plate has the greatest influence on the hysteretic performance of the structure.In practical engineering,it can be used to improve the seismic performance of the structure.