Seismic fragility analysis of new layered assembled joint in steel frame
In order to increase the assembly efficiency of assembled steel frames,a new fully-bolted layered assembled joint was suggested in accordance with the seismic type performance criteria of the joint.The seismic performance test on the new and traditional joints were carried out,and the joint characteristics were introduced into the whole frame mode.The two types of frame models were built by SAP2000 and the incremental dynamic analysis of the structure was performed.Furthermore,the single-parameter damage model based on interlayer displacement angle and the double-parameter damage model based on deformation and cumulative energy dissipation were considered,respectively,and the structural performance level and failure grade were defined,then the seismic fragility of the structure was analyzed.The results show that under both single and double damage indices,the fragility curves of the new joint steel frame are enveloped within the fragility curves of the traditional joint steel frame,and the collapse resistance reserve coefficient of the frame with the new joints is greater,indicating that the use of the new joint can reduce the probability of failure of the structure under each damage condition and improve the collapse resistance of the steel frame.In the LS1 and LS2 limit states,the median peak ground velocity values of the structure based on the single-parameter damage index are smaller than those based on the two-parameter damage index,while the contrary results can be observed in the LS3 and LS4 limit states,implying that cumulative energy dissipation has a significant effect on the assessment of the structural seismic performance,and the combination of the double-parameter damage index can predict the damage level of the structure accurately.In single-parameter and double-parameter damage models,the collapse resistance reserve coefficients of the frame with the new joint are higher than that of the traditional frame,indicating that the new frame has higher collapse reserve capacity and is beneficial to the seismic resistance of the structure.
NETL
NSTL
万方数据
维普
