Mechanical Performance Analysis Of Wide Flat Beam And Seismic Behavior Of Wide Flat Beam Frame-Core Tube

In the structural design of high-rise buildings,due to the limitation of seismic fortification grade requirements,as well as the introduction of floor heating,fresh air system and intelligent equipment,the net floor height has a greater impact.Considering the use of wide flat beam frame-core tube structure in high-rise buildings,the seismic performance of the frame-core tube structure is studied while improving the floor net height.In this paper,ANSYS finite element software is used to analyze the mechanical performance of ordinary beam members and wide flat beam members.The difference of mechanical performance between two kinds of beam members is compared.At the same time,ETABS software is used to analyze the overall structural stress and structural damage mechanism of wide flat beam frame-core tube structure and common beam frame-core tube structure under frequent and rare earthquakes.According to the mechanical performance of wide flat beam and seismic performance of Frame-core tube,the following relevant analysis and research are completed:(1)The ANSYS software is used to build a wide and flat beam construction model and compare with the existing experiments to verify the rationality of the components.Then the load simulation test is carried out on the wide-flat beam component of the common beam component,and the crack development,failure mode,deflection of the component,ultimate load value during failure,stress and strain of concrete and steel bar are compared with the wide-flat beam component as the load increases gradually.The magnitude of initial crack load and the trend of crack formation were observed during the loading process of the two components.The differences between the two components were compared through the deformation and stress nephograms of the beam components.By comparing and analyzing the performance indicators of the two kinds of beam members,it is judged whether the mechanical performance of the wide and flat beam members meets the design requirements.(2)YJK software is used to compare the seismic performance of wide flat beam frame-core tube and common beam frame-core tube structures under frequent earthquakes.The validity of the structure is verified by structural natural vibration period,stiffness ratio,base shear and other parameters.At the same time,the amount of building materials used in the design of wide flat beam frame-core tube andcommon beam frame-core tube structures is compared,and the reinforcement and coagulation of the two structures are compared.Differences in soil usage.In the elastic stage,the response spectrum method of mode decomposition and the elastic time history method are used to compare the differences of the natural vibration period,displacement angle,inter-story shear force and overall stability of the two structures under frequent earthquake conditions,and to analyze the overall seismic performance of the structure.In the plastic analysis stage,the seismic performance of the two structures under three rare seismic waves(one artificial seismic wave and two natural seismic waves)is compared.Under rare earthquakes,comparing the differences of floor displacement,base shear,interstory displacement and vertex displacement time history curves,the seismic performance of wide flat beam frame-core tube structure is evaluated to verify whether it meets the seismic requirements under rare earthquakes.(3)By comparing and analyzing the seismic performance of frame-core tube structure with that of frame-core tube structure,the feasibility of wide-flat beam in frame-core tube structure is demonstrated.On the premise of satisfying the requirement of the overall seismic performance of the structure,adopting a reasonable wide flat beam frame-core tube structure can not only improve the clearance height of high-rise buildings,but also increase the number of stories,improve the comfort of high-rise buildings and increase the economic benefits.In view of frame-core tube structure,the design of wide-flat beam members is adopted in the longitudinal and transverse of the outer frame of the core tube,and the seismic performance of the frame-core tube structure is compared with that of the ordinary beam frame-core tube structure.It provides some reference for the arrangement of wide-flat beam in the longitudinal and transverse direction of the outer frame of the frame-core tube structure.As a starting point of the research,the seismic performance of the frame-core tube structure with wide-flat beam is studied.Research.Under the action of frequent earthquakes and rare earthquakes,the advantages of wide-flat beam frame-core tube structure in practical engineering are expounded by comparing the damage of wide-flat beam frame-core tube structure with that of common beam frame-core tube structure and combining with the engineering example of frame-core tube structure.The relevant parameters in this paper have certain reference value for seismic design of wide flat beam frame-core tube structure.