Research On Design Method Of Replaceable Energy Dissipation Coupling Beam

The traditional shear wall structure often sacrifices the coupling beam to exchange the ductility of the wall limbs.Therefore,coupling beams in actual earthquake damage not only consume poor energy,but also bring difficulties in post-earthquake repair or replacement,which makes it difficult to achieve the goal of functional recoverability of building structures after earthquakes,and is not conducive to improving urban seismic toughness.In order to improve the energy dissipation capacity of the connected beam and the overall seismic performance of the shear wall structure,a part of the connected beam is cut off along the middle span and the upper energy dissipation damping device is replaced or the whole beam is replaced with the energy dissipation damping device.This paper summarizes the current research status of replaceable energy dissipating connected beams,and introduces the research content of this topic in view of the existing problems in the design method of replaceable energy dissipating connected beams.In this paper,the deformation of the coupling beam of the traditional double-limb shear wall is analyzed,the deformation principle of the replaceable energy-dissipating coupling beam is discussed and the relation between the deformation of the replaceable energy-dissipating coupling beam and the inter-layer displacement is given.In order to verify the accuracy of the new method,the stiffness calculation formula of the energy-dissipating coupled beam,which is composed of three parts,"coupled beam supported pier + damper + coupled beam supported pier",is deduced.At the same time,the differences between the new stiffness calculation method,the unmodified stiffness series method and the modified stiffness series method under different stiffness ratio conditions were compared to verify the degree of agreement between the calculation results of the three different stiffness calculation methods and the actual results.In this paper,the influence of the integral parameters on the integrity of the wall and the requirements of the existing codes on the stiffness reduction of the connected beams are analyzed,and how to adapt the stiffness ratio of the energy dissipation connected beams to the requirements of the existing codes on the stiffness reduction of the connected beams is discussed.At the same time,the design and checking calculation of the shear force of the energy dissipation coupled beam are analyzed,and the suggestions for the connection and structural design of the energy dissipation coupled beam are given to ensure that the replaceable energy dissipation coupled beam can work normally and play a good role in energy dissipation.Finally,a set of design methods of replaceable energy-dissipating coupled beams based on stiffness is proposed and its design process is summarized,which provides a reference for the design of shear wall structures with replaceable energy-dissipating coupled beams.Through the comparison and analysis of different design methods,it is proved that the design method of the replaceable energy-dissipating connected beam based on stiffness proposed in this paper is more accurate than the traditional design method.In this paper,the elastic time-history analysis of a frame-core tube structure was carried out by ETABS software,and then the elastoplastic time-history analysis of the structure was carried out by SAUSAGE software.Through the analysis,the applicability of the design method proposed in this paper and the good damping control effect of the energy dissipation coupled beam damping structure were verified.