ATCFSST-SCB中柱节点P-△骨架曲线影响因素分析  

Influencing Factors Analysis on P-△ Skeleton Curves of ATCFSST-SCB Interior Joint

作　　者：李明[1,2] 赵明[1] 王元清[2] 袁赫[1] 

机构地区：[1]沈阳建筑大学土木工程学院,110168 [2]清华大学土木工程系,北京100084

出　　处：《特种结构》2016年第2期25-32,共8页Special Structures

基　　金：国家自然科学基金(51278312);"十二五"国家科技支撑计划(2011BAJ10B04);中国博士后基金面上项目(2014M560938);学科涵育项目资助(XKHY2-22)

摘　　要：为分析外加强环式方钢管混凝土柱-钢蜂窝梁(ATCFSST-SCB)中柱节点在不同因素影响下的受力情况,设计了25个参数不同的中柱节点,采用有限元软件ABAQUS模拟了这些节点在低周往复荷载作用下的受力过程,模拟前采用已有试验数据对模拟方法进行了验证。提取了各节点的P-Δ骨架曲线,并计算了各节点的屈服荷载、极限荷载、破坏荷载、屈服位移和极限位移。通过对比分析,得出如下结论:随轴压比、钢材屈服强度增加,节点承载力提高,延性降低,其中钢材屈服强度引起延性降低更为显著;随加强环板宽度、含钢率增加,节点承载力提高,节点的延性变化规律不明显,当含钢率增加到一定程度后,骨架曲线会更早地进入屈服和下降段,且下降幅度较大;随梁柱线刚度比、孔间距、钢蜂窝梁梁端第一个开孔边缘到柱边距离的增加,节点的承载力提高,但这些参数过大或过小,都会降低节点的延性;随开孔率增加,节点的承载力降低,延性提高。In order to analyze the mechanical behavior of concrete filled square steel tube-steel castellated beam（ATCFSST-SCB） interior joints with different factors,25 interior joints with different factors were designed.Their load-bearing process was simulated by using finite element software ABAQUS,and before simulation,the simulating method was verified by previous relevant test result.The P-Δ skeleton curves of these joints were also extracted.The yield load,the ultimate load,the damaged load,the yield displacement,the ultimate displacement and the displacement ductility coefficient of each joint were also calculated.By analyzing the results,it could be concluded：with the increase of axial compression ratio or steel yield strength,the bearing capacity of the joints increases and the ductility of the joints decreases,and the steel yield strength makes the ductility decrease larger than the axial compression ratio;with the increase of stiffener ring width or steel ratio,the bearing capacity of the joints increases,but the ductility of the joints changes with no obvious regularity,and the skeleton curves would decrease early and largely if the steel ratio increases to some extent;with the increase of beam to column linear stiffness ratio,hole spacing and the distance of the first hole border in SCB to the column border,the bearing capacity of the joints increases,but if these parameters increase or decrease too much,the ductility of them would be decreased;with the increase of opening rate,the bearing capacity decreases,but the ductility increases.

关 键 词：方钢管混凝土柱 钢蜂窝梁 中柱节点 P-△骨架曲线 

分 类 号：TU398.9[建筑科学—结构工程]