Study On Seismic Performance Of Phased Energy-Dissipating Frame-Rocking Wall Structure

With the introduction of the concept of "recoverable functional structures’ ’,the aim is to make it possible to quickly restore the normal functioning of structures after an earthquake without repairing them or with minor repairs in the form of replacement of components,or even to restore the entire city to normal operation.Based on this,this thesis proposes a framework with a staggered energy dissipation mechanism,which allows damping elements to enter the plastic yield stage under seismic action for hysteretic energy dissipation and to perform different energy dissipation levels during normal use,multiple earthquakes and rare earthquakes respectively,which is the innovation of this structure.Based on the theoretical analysis and numerical simulation of the proposed new rock-wall structure,the mechanical principle of rock-wall structure is analyzed,and the unidirectional seismic performance and bidirectional seismic response characteristics of rock-wall structure are systematically studied.The main contents and conclusions of the study were as follows:(1)The basic equation of rocking wall structure with soft steel damper(CSC)is derived and the equivalent stiffness formula of CSC is given.The accuracy and applicability of the theoretical equation are verified by a case.In this thesis,the equivalent stiffness of CSC can play an important role in the force and deformation mechanism of rock-wall structures,and the optimum design of damper parameters is made by determining that the equivalent stiffness is 0.09.(2)Based on a conventional steel-concrete frame structure as the original structure,the rocking wall substructure is embedded in the original structure,and its dynamic elastic-plastic time history analysis is carried out to study the influence of CSC equivalent stiffness on the seismic performance of the structure.Three different structural systems were added as the control group to compare the performance indexes.Results The variation laws of performance indexes of different structural systems with CSC were summarized.Through comparative analysis,it is proved that the seismic performance of the frame-swing wall structure with phased energy dissipation is superior to other structural systems,and it can better improve the damage concentration effect of the frame structure,which is more beneficial to the earthquake resistance of the structure.(3)The variable parameter combination of CSC and ZMD with Z-shaped energy dissipation limbs in the phased energy dissipation frame-swing wall structure is analyzed,and the three-dimensional data diagram is established to discuss its influence on the seismic performance of the structure.As a result,the optimal parameter interval of the variable parameter combination of the two damping elements is obtained,which is convenient for the subsequent two-way seismic performance research of the phased energy dissipation frame-swing wall structure.At the same time,through statistical analysis of the yield of damping elements,the realization mode of energy consumption in stages is analyzed.(4)The optimized parameters of a phased energy-dissipation frame-swing wall structure are arranged in the overall structural model,and the structural systems under the action of no eccentricity and different degrees of one-way eccentricity are established respectively,and the dynamic response of the structure under the rare earthquake is obtained and the overall evaluation of the phased energy-dissipation frame-swing wall is made.The research results show that the seismic performance of the frame-swing wall with phased energy-dissipation mechanism is superior when there is no eccentricity and no degree of one-way eccentricity.