西安建筑科技大学学报(自然科学版)

为了研究X形圆钢管节点平面内受弯滞回性能,进行了两个节点在往复平面内弯矩作用下的试验研究.结果表明:两个节点的破坏模式均为相贯线附近焊缝热影响区的主管管壁开裂,开裂前主管管壁经历显著的塑性发展; 节点表现出良好的滞回性能; 主管管壁塑性变形和开裂后的裂纹扩散成为节点的主要耗能模式,尽管支管根部的塑性变形对耗能也有贡献.对比支主管正交节点(支主管夹角90°),支主管斜交节点(支主管夹角非90°)具有更高的抗弯承载力,并且具有更好的延性和耗能能力.当支主管斜交且夹角较大(大于70°)时,夹角正弦的倒数能较好地反映了支主管斜交对节点承载力的有利影响.

To study the in-plane flexural hysteretic behavior of unstiffened circular hollow section(CHS)X-joints, an experimental test on two CHS X-joints with different brace-to-chord angle(BCA)under cyclic in-plane moment(IPM)were performed. The results show that the failure modes of both joints are cracking of the chord wall in the heat affected zone of the weld near the intersecting line, and the chord wall undergoes significant plastic deformation before cracking. Two X-joints behave excellently in hysteretic behavior. The plastic deformation of the chord wall and the crack propagation after cracking become the main energy consumption modes of the joint, although the plastic deformation of the branch pipe root also contributes to the energy consumption. In contrast, the X-joints with brace-to-chord skew(i.e., BCA is not 90°)have better ductility and higher flexural capacity and energy consumption capacity than the X-joints with brace-to-chord orthogonal(i.e., BCA is 90°). For the X-joints with brace-to-chord skew but larger BCA(larger than 70°), the reciprocal of the sine of BCA can reflects the beneficial influence of brace-to-chord skew on the in-plane flexural capacity.

引言
1 试验概况
2 试验结果及分析
3 结论

图1 试件简图
Fig.1 Test specimens

表1 试件的几何特征
Tab.1 Size of specimens

表2 钢管材性试验结果(平均值)<br/>Tab.2 Test results of material properties(Average value)

表2 钢管材性试验结果(平均值)
Tab.2 Test results of material properties(Average value)

图2 试件的加载装置示意图<br/>Fig.2 Schematic diagram of test setup

图2 试件的加载装置示意图
Fig.2 Schematic diagram of test setup

图3 试件的应变片与位移计布置<br/>Fig.3 Arrangement of strain and displacement gauges

图3 试件的应变片与位移计布置
Fig.3 Arrangement of strain and displacement gauges

图4 试件破坏照片<br/>Fig.4 Failure of specimens

图4 试件破坏照片
Fig.4 Failure of specimens

图5 支管端荷载-相对位移滞回曲线<br/>Fig.5 Load-displacement hysteretic curves

图5 支管端荷载-相对位移滞回曲线
Fig.5 Load-displacement hysteretic curves

图6 节点的平面内弯矩-转角(Mi-ψi)滞回曲线<br/>Fig.6 Moment-rotation(Mi-ψi)hysteretic curves

图6 节点的平面内弯矩-转角(Mi-ψi)滞回曲线
Fig.6 Moment-rotation(Mi-ψi)hysteretic curves

图7 荷载-应变滞回曲线<br/>Fig.7 Load-strain hysteretic curves

图7 荷载-应变滞回曲线
Fig.7 Load-strain hysteretic curves

表3 节点抗弯承载力试验值与规范计算值<br/>Tab.3 Test value and standard calculation value of bending capacity of joints

表3 节点抗弯承载力试验值与规范计算值
Tab.3 Test value and standard calculation value of bending capacity of joints

表4 节点延性系数<br/>Tab.4 Ductility ratio of joints

表4 节点延性系数
Tab.4 Ductility ratio of joints

表5 耗能分析<br/>Tab.5 Energy dissipation assessment

表5 耗能分析
Tab.5 Energy dissipation assessment

图8 试件的等效塑性应变云图比较<br/>Fig.8 Strain contours comparison of two X-joints

图8 试件的等效塑性应变云图比较
Fig.8 Strain contours comparison of two X-joints

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备注

引言

1 试验概况

2 试验结果及分析

3 结论

期刊信息