Performance Research Of Novel Steel-plate Assembled Buckling-restrained Brace

In this paper, pertinent literature about the assembled buckling-restrained braces(ABRB)was summarized and made comments briefly. Aiming at the current problem about ABRB, anovel type ABRB called novel steel plate assembled buckling-restrained brace(APB) was putforward. The simulated software ABAQUS was used to simulate the performance of the APB.Based on the results of the simulating, a set of the test specimen was designed and researchedby the low frequency cyclic loading. Then, APB was installed in a four storey reinforcementconcrete frame. The earthquake reaction of the primary frame and the APB-frame wererespectively studied by the elastic time-procedure analysis via ETABS and the elastic-plasticdynamic time-procedure analysis via PERFORM-3D. The design method of the APB was putforward based on the results of simulating, test and earthquake analysis.To research the APB behavior affected by different number of bolts, different endstructure, perforating core unit and the gap between the core and restraining,28simulatingmodels divided into three type models were designed. The simulating results revealed that theoverall stability of the restraining could guarantee and the hysteretic curves were stable underthe ratio of the bolt spacing and the core wave length was less than2, the end of the bracecould be protected and strengthened if the end structure was embedded., the ratio of theperforating zone length and the core length should be within the scope of2/5~1/2, a row holeand two row hole have no obvious affection on the brace behavior, the ratio of the perforatinglength and non-perforating length should be within the scope of20%~40%, the degree ofcrosswise weakening should be within the scope of20%~30%, the core poisson effect couldbe freed and the bearing capacity could be stable under the gap between0.5mm~1.5mm.Four APB test specimens divided into two rigid connection specimens and two hingeconnection specimens were designed. Low frequency cyclic loading was used to study thecore perforating, the end structure and connection type of the specimens. The test results revealed the brace had a full hysteretic curve and stable energy dissipative capacity, the corecan occur yield at several points and fixed points, the end protective construction can work ata certain extent and the rigid and hinge both could make the brace work well.According to the elastic and elastic-plastic dynamic time-procedure analysis about theprimary frame and the energy dissipation frame with APB, we can know that the APB canoffer stiffness to control the story drift angle and the roof acceleration under the frequentearthquake and at rare earthquake the almost earthquake energy of the primary was dissipatedby the main structure element, however half earthquake energy of the frame with APB wasdissipated by the APB and the degree of the main element yielding in the frame with APB wasless than primary frame obviously and it revealed the frame with APB improved the securityof the main structure.Based on the research results of the simulating and test, the design method of APB wasput forward. The design method included the confirmation of the fundamental parameters andcheck method about stability expounded by a design example.