钢管混凝土柱-钢蜂窝梁中柱节点弯矩-转角骨架曲线影响因素  

Influencing Factors on CFCST-SCBIJ Moment-Curvature Skeleton Curves

作　　者：李明[1,2] 张沛楠[1] 王元清 刘勇[1] 

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

出　　处：《沈阳建筑大学学报（自然科学版）》2017年第1期50-59,共10页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(513083856);中国博士后基金面上项目(2014M560938);沈阳建筑大学学科涵育项目(XKHY2-22)

摘　　要：目的分析不同因素对外加强环式圆钢管混凝土柱-钢蜂窝梁中柱节点弯矩-转角骨架曲线的影响,确定影响节点"强柱弱梁"屈服机制的重要因素,为该种节点的设计提供参考.方法设计了24个钢材屈服强度、含钢率等参数不同的节点,采用有限元软件模拟了全部节点在低周往复荷载作用下的受力过程,分析了不同参数对弯矩-转角骨架曲线的影响,模拟前采用已有文献试验结果验证了模拟方法.结果钢材屈服强度、含钢率和梁柱线刚度比的增大,该种节点的抗弯承载力、极限抗弯承载力和初始刚度明显增大;轴压比对节点弯矩-转角骨架曲线影响很小;加强环板宽度增加,对节点的抗弯承载力、极限抗弯承载力和初始刚度提高幅度不大;距离和孔间距增大或开孔率减小,节点的抗弯承载力、极限抗弯承载力和初始刚度有所增加,但增加幅度不大,并且增加程度在非弹性阶段更为明显.结论开孔率、距离和孔间距是引起该种节点更容易实现"强柱弱梁"屈服机制的重要因素,影响程度开孔率最大、孔间距最小.In order to provide a basis for how to design concrete filled circular steel tube-steel castellated beam interior joint with outer annular-stiffener（ CFCST-SCBIJ）, the factors that influence the moment-curvature skeleton curves are analyzed. 24 such joints with different parameters, including steel yield strength, steel ratio etc, are designed and their load-bearing process under low cyclic repeated horizontal load is simulated with finite element software. The simulation method is tested by the previous result in the existed paper before simulation. The factors that influence the moment-curvature skeleton curves are analyzed. It shows that： the flexural bearing capacity （FBC） ,the ultimate flexural bearing capacity（UFBC） and the initial stiffness（IS） of the joints increases obviously with the increasing of steel yield strength, steel ratio and beam to column linear stiffness ratio;the axial compression ratio has little influence on the moment-curvature curves;with the increase of the width of outer annular-stiffener, the increasing extend of the FBC, the UFBC and the IS is not large;with the increase of the distance and the distance of the adjacent holes or the decrease of the opening rate, the FBC, the UFBC and the IS of the joint increases, but the increasing extend is small and it is more obvious in inelastic stage. It can be concluded that the distance ,the distance of the adjacent holes and the opening rate are the important parameters that make OATCFCST-SCBIJ are easier to realize the yield mechanism of ＂strong column and weak beam＂, of which the opening rate has the largest influence and the distance of the adjacent holes has the smallest influence.

关 键 词：外加强环 钢管混凝土柱 钢蜂窝梁 弯矩-转角 骨架曲线 

分 类 号：TU392[建筑科学—结构工程]