Finite Element Analysis Of Seimic Energy Dissipation Of Eccentric Brace Steeland GFRP Structure

This paper fully considers the eccentric brace frame structure and GFRP materials research results at home and abroad,through the combination of theoretical analysis and numerical simulation,respectively,the typical Y,K-shaped eccentric brace frame structure and Y-shaped eccentric brace GFRP frame structure typical finite element analysis of seismic energy consumption,mainly to study the followings:1.In this paper,Y-shaped and K-shaped eccentric braced frames are analyzed by nonlinear finite element method to compare the seismic energy dissipation performance of eccentrically braced frames with different braced types.In the simulation analysis of the steel combination K-shaped and Y-shaped steel frames,the Q235 steel is used for energy-consuming sections and braced,and the Q345 and Q460 are used for the beam-column members.Under the same section size and the same load conditions,the energy dissipation capacity of the two structures under earthquakes was analyzed and compared.By comparing the two frames under the action of the reciprocating load,the following results are obtained: 1.The hysteretic curves of the K-shaped and Y-eccentric braced steel frames are similar,and the difference is not significant.Both of them show a certain energy dissipation capacity.2.The energy dissipated in the energy-consuming sections of both braced types exceeds 40%,and the energy is mainlyborne by the energy-consuming section.3.The overall energy dissipation of the Y-shaped braced frame is stronger than that of the K-shape.The energy-consuming section of the Y-shaped frame is independent of the frame beams and columns.The elasto-plastic deformation is concentrated on the energy-consuming section and can be quickly repaired after the earthquake.2.To further extend and expand,establish a Y-shaped eccentrically braced GFRP frame structure.The energy-consuming section and braced are made of steel,and the frame beam is made of GFRP material.Three sets of test specimens were established.The parameters of the energy dissipation section of the test specimen were changed: the material combination of the energy dissipation section,the length of the energy dissipation section,and the web thickness of the energy dissipation section.The hysteresis curve of the Y-shaped eccentrically braced GFRP frame structure was investigated.The hysteresis curve of the component,the ratio of energy consumption,etc.The change law of the bearing capacity,stiffness,ductility and energy dissipation performance of the energy dissipation section for the whole structure was analyzed.The results are summarized as follows: 1.The Y-shaped eccentrically braced GFRP frame structure uses energy-reducing sections and braced with low Q235 B yield points.Its hysteretic energy performance and ultimate bearing capacity are relatively good.The ideal seismic structure can be applied to areas with high intensity.2.The length of the energy-consuming section should adopt a suitable length of 700 mm.Short and long will affect the overall energy dissipation performance of the frame structure.Appropriately increasing the length of the energy-consuming section can improve the ductility of the structure and better utilize the energy-consuming capacity of the steel.3.As the mainpart of the energy consumption of the frame,it can be seen from the analysis results that increasing the thickness of the web of the energy-consuming section will not increase the overall hysteretic energy consumption of the structure,but will instead cause the overall ductility of the structure to decline and the subsequent decline will be slower.According to the results of the simulation analysis in this paper,the energy consumption of each component of the Y-and K-shaped eccentrically braced steel frames is summarized,and the failure modes of the two braced structures under earthquake loading are studied.The seismic performance of the Y-shaped eccentrically braced GFRP frame structure is analyzed in detail,and it is of great significance to improve the application of this new type of structural material to the structural components of the frame,which gives a certain reference value for future engineering designers.