Seismic Performance Of The Assembled Plastic-deformation Controllable Steel Hinge And Its Buckling-Restrained Braced Frames Structure

The node and connection of the current assembled concrete structure are still weak in seismic performance,the assembled reinforced concrete structure system can be further optimized and improved.Therefore,it is necessary to develop a new assembled building structural system of high performance to meet the requirements of higher seismic performance.This dissertation proposes a new system of assembled reinforced concrete structure with large side stiffness,plastic controllable and replaceable plasticdeformation steel controllable hinge.The following research was carried out on the assembled plastic-deformation steel controllable hinge and its buckling-restrained braced frames structure.From the pseudo-static test that carried out on two sets of five hinge flange buckling constrained metal connecting plates of different structural form,the seismic behavior of P-? hysteresis curve,bearing capacity change,stress-strain distribution and development,axial stiffness,ductility and energy dissipation capacity under low-cycle reciprocating load were studied.The result shows that under the action of reciprocating load,the hysteresis curve of the buckling constrained metal connecting plate is full,the energy of dissipation is large,and the ductility is good.It shows that the two kinds of hinge buckling-restrained metallic connecting plate have good hysteresis performance.Applying ABAQUS to conduct finite element analysis of the hinged bucklingrestrained metallic connecting plate test.Based on the verification of the accuracy of the finite element model,the mechanism analysis and parameter analysis were carried out.According to the parameter analysis,reasonable design suggestions for the buckling-restrained metallic connecting plate are given.According to the simplified mechanical model and parameter analysis results,the restoring force model of the buckling-constrained metal connecting plate is proposed and compared with the experimental results to verify its correctness.The pseudo-static test of two sets of plastic-deformation steel controllable hinge in different structural forms is carried out to study the seismic performance of M-? hysteresis curve,bearing capacity change,stress-strain distribution and development,rotational stiffness,ductility and energy dissipation capacity under low-cycle reciprocating load.The result shows that under the action of reciprocating load the two steel bending energy consuming hinges are full of hysteresis curve,the large of energy dissipation,the good ductility,and the strength degradation is not obvious,and reciprocating bending energy dissipation hinge has good hysteresis performance.According to the force characteristics of plastic-deformation steel controllable hinge,the simplified mechanical model is concerned,then put forward the resilience model of steel plastic controllable hinge,and verify the correctness with the test fitting.Conduct static and dynamic elastoplastic analysis of traditional assembled frame structures and assembled plastic-deformation steel controllable hinge and bucklingrestrained braced frames structure.The results show that the assembled plasticdeformation steel controllable hinge and buckling-restrained braced frames structure is better than the traditional assembled structure in higher bearing capacity and better overall lateral resistance,structural ductility and safe reserve capacity.Under strong earthquake,it can not only effectively control the nonlinear response of the structure but reduce the acceleration and displacement of the floor.It can realized the requirements of multi-channel seismic fortification of "strong column-middle beamweak brace",and there was no plastic hinge at the end of the beam.After the earthquake,the damaged Buckling-Restrained Braces and the plastic-deformation steel controllable hinge can be replaced and the structure can be quickly re-used,realizing the replaceable and recoverable function of the assembled structure.