Residual Deformation And Energy-dissipation-element Arrangement Of Damage-control Structures

In recent years,the seismic resilience concept has attracted more and more attention and has become an important goal in the seismic design of building structures.Based on the seismic resilience concept,damage-control structures consist of energy dissipation elements(EDEs)and the main structure.Under design-level earthquake events,the main structure will be protected by energy dissipation elements,which can effectively reduce the residual deformation after earthquake.Different from traditional building structures,damage-control structures have unique multi-yielding-stages characteristic and damage-control effect,hence there are still many issues worth studying in the research area of the residual deformation characteristic and the low-residual-deformation design theory of damage-control structures.In this paper,the residual deformation characteristic and the EDEs arrangement of damage control structures are studied with the single degree of freedom(SDOF)system of equivalent damage control structures and the plastic hinge and beam element numerical model,respectively.First,the SDOF system with the ideal trilinear hysteretic model is adopted to simulate the ideal damage-control structure,on the other hand,the modified Ibarra-Krawinkler deterioration model with bilinear hysteretic response and the SDOF system that consist of two parallel springs and one oscillator are adopted to simulate the damage-control structure with the performance deterioration of EDEs.By comparing the constant-strength spectra of the residual deformation,the influence of the performance deterioration of EDEs on the residual deformation can be obtained.Then,the system state transition identification method based on quantile statistics is proposed to identify the system state transition of the SDOF systems under the near-fault earthquake.Finally,the plastic hinge and beam element numerical model of high-strength steel frame structure with energy dissipation beams(EDBs)is established and verified,and the various EDBs arrangements are adopted to adjust the strength of EDBs,hence the influence of the EDBs arrangements on the seismic performance and damage-control effect of the structure can be studied.And the recommended EDBs arrangements are provided through the multi-index gain and loss assessment.Furthermore,the design concept of an assembly-type beam-column connection based on the component-replaceable mechanism is proposed to meet the needs of replaceable and strength adjustment of the EDBs.Through the research,the main conclusions are listed below: 1)the residual deformation spectra of damage-control structures present significant multi-stages characteristic that is closely related to the system state transition process.The starting,finishing and intermediate points of the system state transition process can be used as the key points to describe the multi-stage characteristic of the residual deformation spectra.2)the performance deterioration of EDEs does not change the multi-stage characteristic of the residual deformation spectra and the corresponding close relationship with the system state transition process.3)the moderate strength reduction of EDEs will promote the damage-control effect and reduce the plastic development degree of the main structure,hence the residual deformation of the high-strength steel frame structure with EDEs is significantly reduced.But the excessive reduction will accelerate the damage development of EDEs,and the plastic development degree of the main structure will turn to increase.