Design Study Of Coupling Beam With Floor Beams Resting In A Super High-rise Core Structure

This paper takes a super high-rise frame-core tube structure in Hefei as the object of study,combined with the review of the provincial overrun committee,for the core tube inside the building has secondary beams resting on the connecting beam,in order to ensure that the connecting beam energy dissipation at the same time,but also load-bearing lap on the secondary beam above,in the earthquake action does not occur serious damage to prevent the floor collapse.The following studies are done in this paper.(1)Firstly,the importance of the connecting beam as an energy dissipating member,its stress mechanism and damage pattern under earthquake action and the current research status of the connecting beam in the domestic and international literature are introduced,and the basic theory of seismic resistance and the analysis methods under different earthquakes are presented,and several seismic design measures for the connecting beam are introduced.(2)The vibration decomposition reaction spectrum and elastic time analysis of the structure under small earthquakes are carried out.The analysis results show that the seismic performance indexes obtained from the elastic calculations under multiple earthquakes are in accordance with the code limits and can meet the target requirement of "no damage in small earthquakes".The results show that the hinge can effectively reduce the large torque generated by the secondary beam on the connecting beam during the rigid connection,and due to the "strong shear and weak bending" internal force adjustment and the discount factor of the stiffness of the connecting beam,most of the core connecting beam with secondary beam lap is in the elastic state.(3)Under the earthquake.(3)The structure was analyzed for seismic failure under the earthquake,and the results showed that most of the tie beams in the core of the structure were overreinforced.In order to avoid shear damage of the tie beams,three measures were designed for the tie beams with secondary beams resting on the floor: diagonal diagonal reinforcement in the tie beams,increasing the cross section to variable section tie beams,and built-in steel sections.(4)Midas building finite element software was used to analyze the dynamic-elastic time course of the structure under rare earthquakes,to study the plastic damage and overall deformation of the main components,especially the damage and plastic strain of the connecting beam between the core and the secondary beam,to confirm whether the structure meets the seismic performance target and achieves the "no collapse in large earthquakes" requirement."The shear damage of the core bar with floor secondary beam laps under the earthquake,combined with the results of the seismic unyielding analysis,was used for the secondary beam with floor secondary beam laps only.(5)On the basis of the overall analysis of the connecting beams with floor secondary beams resting on the small,medium and large earthquakes respectively,the core bar connecting beams with built-in sections with more serious structural damage under large earthquakes were selected,and the finite element analysis software Abaqus was used to further analyze the details of the connecting beam members to ensure that the connecting beams with floor secondary beams overlapping achieve the function of load-bearing and energy dissipation.Figure:58;Table:38;Reference: 58.