摘要
进行了六片方形冷弯型钢钢管混凝土梁在反复荷载作用下的试验研究和非线性有限元分析,研究不同跨高比和截面宽厚比对冷弯型钢钢管混凝土梁的滞回性能、延性和耗能能力等的影响。结果表明:(1)方型冷弯薄壁钢管混凝土梁的荷载-位移滞回曲线比较饱满,没有明显的捏缩现象,具有很好的延性和耗能能力;(2)跨高比和宽厚比会严重影响方型冷弯薄壁钢管混凝土梁的滞回性能和延性;(3)建立的非线性有限元模型能够预测冷弯薄壁钢管混凝土梁的弹塑性行为和抗震性能,计算结果与实测结果基本吻合,可以进一步应用方型冷弯薄壁钢管混凝土梁的参数影响分析计算。
Six pieces of concrete-filled cold-formed square steel tube beams subjected to low-cycle reversed loading was tested,and nonlinear finiete element anaysis was also conducted to explore the effects of span to height ratios and width to thickness ratios of cross-section on the hysteretic behavior,ductility,and ability of energy dissipation.Some important conclusions can be drawn from the experiments and the nonlinear analysis and listed as follows：（1）The concrete-filled cold-formed square steel tube beams exhibit stable hysteresis behavior up to local buckling and then show considerable good ductility and good ability of energy dissipation.The pinch-crinkle phenomena do not occur in the hysteresis loops of load-displacement.（2） The hysteresis behavior and ductility of concrete-filled cold-formed square steel tube beams depend on the span to height ratios and width to thickness ratios.（3） The proposed nonlinear FE model could accurately predict the overall seismic behavior and the inelastic performance of the concrete-filled cold-formed square steel tube beams.The hysteresis loops from nonlinear FE models under low-cycle reversed loading agree well with those from the low-cyclic reversed loading tests.The proposed nonlinear FE model could also be used to conduct the nonlinear parameter analysis of the cold-fromed composite beams.
出处
《地震工程与工程振动》
CSCD
北大核心
2010年第5期57-64,共8页
Earthquake Engineering and Engineering Dynamics
关键词
方型冷弯薄壁钢管混凝土梁
非线性有限元分析
滞回性能
试验研究
低周反复荷载作用
concrete-filled cold-formed square steel tube beams
nonlinear finite element analysis
hysteresis behavior
experimental study
low-cycle reversed loading
