Study on seismic performance of rocking steel braced framestructure with rigid connection between brace and foundation
In order to make the rocking steel braced frame structure equipped with energy dissipation capacity and better control the rocking amplitude of the structure under earthquake action,the paper proposes that energy dissipation devices be set at the column base on both sides of the rocking steel braced frame column,and that the structure between the rocking steel brace and the foundation be simplified,and the brace and the foundation are rigidly connected.The finite element software ABAQUS was used to establish the structural model of the rocking steel braced frame with rigid connection between the brace and the foundation;the model was subjected to low circumferential reciprocating loading,then its damage mode was obtained;the effects of design parameters such as the opening spacing of the shear plate at the base of the energy-consuming columns,the thickness of the shear plate and the span of the central steel brace on its hysteresis performance were analyzed,then the sug-gested values of the structural design parameters and the formula for calculating the ultimate load carrying capac-ity were given.The analysis results show that the hysteresis performance of the rocking steel braced frame struc-ture with rigid connection between the brace and foundation is excellent,and the damage mode is reasonable.Under the action of horizontal load,the energy-consuming column base takes the lead to enter the plastic energy dissipation,and the plastic deformation is sufficient,and the energy-consuming capacity is strong.During the loading process,the high-strength bolts do not reach the ultimate strength,and the connection method is reli-able.With the increase of the opening space,the thickness of the shear plate and the braced span,the lateral bearing capacity and stiffness of the structure in the same lateral displacement ratio increase,but the energy-consuming capacity decreases.The calculation results by the formula are in good agreement with the finite ele-ment results,which can be used as a reference for practical engineering.
rocking steel braceenergy-consuming column baseseismic performancefinite element analysis
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