The Research On The Effect Of The Buckling-restrained Brace On The Seismic Performance Of The Frame Structure With Overhanging Pitched Roof In Shundu Cultural Center

Overhanging pitched roof frame structure is prevalent among antique buildings inthe urban architecture. The main role of the overhanging pitched roof is the need of theshape of the building facade, or to act as the awning. Due to the impact of overhangingpitched roof, the vertical lateral force resistance member of the structure becomesdiscontinuity,the lateral stiffness of the structure becomes uneven, and the stiffness ofstructure at the upper part is larger than that at the lower part generally. In the district of8degrees, It is difficult to meet the restrictions of “Seismic Design of Buildings (GB50011-2010) just by increasing the cross section of beams and columns if the layout offrame columns is constrained. Buckling-restrained braces is a highly effectiveanti-lateral force component. It can effectively increase the lateral stiffness of thestructure. Bucking restrained braces has been widely applied in abroad buildingstructures. Currently, the research on buckling-restrained braces of domestic scholarsfocuses on the theoretical analysis phase. There are also some experimental researchdata, but involves less in the engineering field.In view of this, the research details of the overhanging pitched roof frame structurewith buckling-restrained brace basing on practical are as followings:1. The dynamic characteristics and seismic response analysis of overhangingpitched roof frame structure (without buckling-restrained brace) is made, the resultsshow that the torsion effect in the upper part of the structure is apparent and interlayershear force of the structure is concentrated in the upper part of the structure as a resultof the existence of overhanging slope roof structure, the stiffness of structure at the upper part is larger than that at the lower part generally.2. According to working mechanism and calculation principle of the structure withbuckling-restrained brace, the Wen plastic model and the kinematic model are adoptedby the model of buckling-restrained brace, the equivalent cross section area,the bearingcapacity and mechanical model of the buckling-restrained brace are calculated andanalysed.3. The arrangement scheme of the buckling-restrained brace is determined basingon the analysis results of the original structure. The mode-superposition responsespectrum analysis and the time history analysis on the structure are made, theimprovement of the seismic performance of the structure by the buckling-restrainedbrace is analysed, the destruction of buckling-restrained brace under mediumearthquake and large earthquake is studied.With the action of the buckling-restrainedbrace, the torsion effect is reduced, the story drift and the stress of the beam and columnare decreased, the seismic performance of the structure is also improved.4. Basing on the results of the mode-superposition response spectrum analysis andtime history analysis, the economic evaluation of the whether using thebuckling-restrained brace or not is made on the method of value engineering.