摘要
Abstract
To investigate the seismic performance of staggered truss steel frame with steel plates shear wall with slits(STSF-SPWS),the quasi-static tests on a STSF-SPWS truss specimen and on a traditional staggered truss steel frame(STSF)truss specimen were carried out.The failure modes,load versus displacement hysteresis/skeleton curves,load bearing capacity,stiffness degradation curves,and equivalent viscous damping coefficient of the specimens were investigated.In addition,finite element models were established for the STSF-SPWS and STSF truss specimens.Based on the verified finite element models,collaborative analysis models were developed,and used to analyze the energy dissipation mechanisms and nonlinear hysteresis energy dissipation capacities of these two structures and to conduct parametric analysis.The test results show that local buckling occurres at the flange of vierendeel internode chords in the STSF specimen at failure,while when the STSF-SPWS specimen failes,local buckling occurres at the SPWS wall limbs and the flange of vierendeel internode chords.Compared with the STSF specimen,the STSF-SPWS specimen has a lower stiffness,and an approximately 10.3％lower.However,the energy dissipation capacity of the STSF-SPWS specimen is better than that of the STSF specimen with the displacement ductility coefficient increased by 55.2％.Through finite element analysis,it is found that,compared with tradition STSF,properly designed SPWS could provide the required lateral stiffness for the structures.Meanwhile,under earthquakes,the SPWS and vierendeel internode chords would yield successively,facilitating a desirable energy dissipation mechanism.Furthermore,the load bearing capacity and stiffness of STSF-SPWS structures increase with the decreasing height-to-width ratio and height-to-thickness ratio of SPWS.关键词
交错桁架钢框架/开缝钢板剪力墙/拟静力试验/有限元分析/抗震性能/屈服机制/耗能能力Key words
staggered truss steel frame/steel plates shear wall with slits/quasi-static test/finite element analysis/seismic performance/yield mechanism/energy dissipation capacity分类
土木建筑
