Study On The Anti-seismic Performance Of Energy-dissipating Fabricated Structure With Grouted Sleeve Splicing

As a kind of structural style featured with high efficiency,energy conservation and emission reduction,fast progress and great component quality,fabricated reinforced concrete construction has been universally studied at home and abroad and has been generally used in engineering.It is a good measure that combine Buckling-Restrained Brace(BRB)with the fabricated reinforced concrete structure to improve the seismic performance of the fabricated structure.In this pape,the seismic performance analysis of the assembled frame structure with sleeve-grouting connection and its energy-dissipating structure under different types of ground motions are carried out,comparing with the corresponding cast-in-place aseismic structure and cast-in-place energy-dissipating structure.In order to further study based on the seismic performance of the energy-dissipating structure with Buckling-Restrained Brace under the action of extremely rare ground motion,the ultimate compression failure mode and low-cycle fatigue damage failure mode of Buckling-Restrained Brace are considered and its numerical simulation analysis is carried out.The main research contents and results of this paper are as follows:(1)The ultimate compression failure test is carried out on the Buckling-Restrained Brace.The test results show that the buckling restraint support Buckling-Restrained Brace will contact the filling material after reaching the ultimate compression displacement,thus,it will cause sudden change in stiffness.However,due to the strength factor of the filling material,the stiffness variety is smaller than its expected.Constitutive relationship from experimental ultimate pressure failure mode is simulated in the ABAQUS finite element software using Axial connection unit,and then obtain the Buckling-Restrained Brace low cycle fatigue damage failure mode constitutive relationship through self-programming.(2)A modeling method is proposed that aimed at the beam-column joint with sleevegrouting connection by ABAQUS finite element software.By comparing with the existing literature and research,the method is equipped with logical rationality and numerical accuracy and can meet requires.aseismic structures are designed through the energy dissipation.Analysis models are established in the ABAQUS finite element software,including the fabricated structure model with the sleeve-grouting connection,its damping structure,the corresponding cast-in-place aseismic structure and cast-in-place damping structure.(3)The numerical simulations of different types of ground motions under rare earthquakes were carried out on the four refined finite element models.The seismic performance of the fabricated structure with sleeve grouting joint was studied in depth.The results show that the area between the sleeve and the column end is seriously damaged and the near-field type ground motion with pulse will lead to serious floor damage on the structure.The fabricated structure with Buckling-Restrained Brace has better damping effect,so that main structure can be effectively protected and the damage of them will relatively reduce,the residual interlayer drift of the structure also got reduce.When the near-field pulse-type ground motion and the far-field long-period earthquake are applied,the energy dissipation effect of the Buckling-Restrained Brace will be suppressed.(4)In the case of extremely rare ground motion,two considered types of buckling-constrained failure modes occur the ultimate compression failure mode and the premature failure,resulting in no buckling for two Buckling-Restrained Brace with low cycle fatigue damage failure mode.Sleeve grouting connection energy dissipation structure considering BRB low cycle fatigue damage failure after BRB failure,the structure has obvious weak layers,which makes the seismic performance of the structure decrease.