西安建筑科技大学学报(自然科学版)

随着不锈钢结构的广泛应用,不锈钢相贯节点越来越多地用于建筑结构中.然而,不锈钢圆管相贯节点的性能和设计方法却鲜有研究.考虑几何因素和弦杆预加载荷对节点承载力的影响,共对6个T形和3个Y形不锈钢圆管相贯节点,进行了支管受拉承载力试验研究.获得了材料性能、破坏模式、节点承载力和载荷-变形曲线.试验结果表明:T形、Y形节点的破坏模式相似,均为节点域弦杆的塑性变形.基于试验结果建立了节点有限元分析模型,经试验验证后进行了参数化分析,以研究支管受力状态对节点承载力的影响.数值分析结果表明:不锈钢圆管T形、Y形相贯节点支管受拉承载力始终大于支管受压承载力.基于国内外设计规范中支管受拉与支管受压T形相贯节点采用相同设计公式的背景,采用文献[15]提出的不锈钢圆管T形和Y形支管受压相贯节点承载力设计公式预测节点承载力,并与CIDECT计算结果对比.结果表明:CIDECT计算结果是偏保守的,文献[15]提出的公式具有良好的准确性.

With the widespread application of stainless steel structures, stainless steel hollow section joints in cold-rolled tubes are increasingly used in building structures. However, the performance and design methods of stainless steel circular tubular joints are rarely studied. A total of six T-joints and three Y-joints were tested considering the effect of the geometric configurations and the preload in the chord on the behaviors of the joint. The material properties, failure modes, joint strengths and load-deformation curves were all reported. The test results showed that the failure mode of T-joints, as well as Y-joints, was the plastic deformation of the chord at the panel zone. Based on the test results, the finite element analysis model of the joint was established, and the parametric analysis was carried out to study the effect of brace load on the joint strength. The results showed that the capacity of stainless steel T- and Y-joints in circular hollow sections with brace under axial tension was always greater than that of those with brace under axial compression. According to the background of using the same design formula for both the braces under axial tension and compression in the specifications at home and abroad, the capacity of the stainless steel T- and Y-joints in circular hollow sections was finally calculated by using the formula proposed in Ref[12] and compared with predictions using the CIDECT recommendations. The results showed that the CIDECT's predictions were conservative and the formula proposed in Ref[12] had good accuracy.

引言
1 试验研究
2 数值模拟与参数化分析
3 节点承载力计算公式
4 结论

表1 不锈钢圆管T形、Y形节点的测量尺寸和弦杆预加载荷<br/>Tab.1 Measured dimensions and chord preload of stainless steel T- and Y-joints in circular hollow sections

表1 不锈钢圆管T形、Y形节点的测量尺寸和弦杆预加载荷
Tab.1 Measured dimensions and chord preload of stainless steel T- and Y-joints in circular hollow sections

图1 节点示意图<br/>Fig.1 Schematic diagrams of joints

图1 节点示意图
Fig.1 Schematic diagrams of joints

图2 材性试验图<br/>Fig.2 Photograph of material tests

图2 材性试验图
Fig.2 Photograph of material tests

表2 材料性能试验结果<br/>Tab.2 Test results of material properties

表2 材料性能试验结果
Tab.2 Test results of material properties

图3 加载装置示意图<br/>Fig.3 Diagrams of test rig

图3 加载装置示意图
Fig.3 Diagrams of test rig

图4 加载实物图<br/>Fig.4 Photograph of test rig

图4 加载实物图
Fig.4 Photograph of test rig

图5 T形节点位移计布置图<br/>Fig.5 Arrangements of displacement transducers for T-joints

图5 T形节点位移计布置图
Fig.5 Arrangements of displacement transducers for T-joints

图6 Y形节点位移计布置图<br/>Fig.6 Arrangements of displacement transducers for Y-joints

图6 Y形节点位移计布置图
Fig.6 Arrangements of displacement transducers for Y-joints

图7 TT102×76-P0节点破坏模式<br/>Fig.7 Failure mode of TT102×76-P0

图7 TT102×76-P0节点破坏模式
Fig.7 Failure mode of TT102×76-P0

图8 YT102×76-P0节点破坏模式<br/>Fig.8 Failure mode of YT102×76-P0

图8 YT102×76-P0节点破坏模式
Fig.8 Failure mode of YT102×76-P0

图9 T形节点荷载-位移曲线<br/>Fig.9 Load-deformation curves of T-joints

图9 T形节点荷载-位移曲线
Fig.9 Load-deformation curves of T-joints

图10 Y形节点荷载-位移曲线<br/>Fig.10 Load-deformation curves of Y-joints

图10 Y形节点荷载-位移曲线
Fig.10 Load-deformation curves of Y-joints

表3 节点试验结果及其与有限元、现行方法预测值的比较<br/>Tab.3 Test results and comparisons of test strengths and predicted strengths by finite element models and CIDECT

表3 节点试验结果及其与有限元、现行方法预测值的比较
Tab.3 Test results and comparisons of test strengths and predicted strengths by finite element models and CIDECT

图11 节点有限元模型<br/>Fig.11 Finite element model of joints

图11 节点有限元模型
Fig.11 Finite element model of joints

图12 焊缝模拟示意图<br/>Fig.12 Simulation of weld

图12 焊缝模拟示意图
Fig.12 Simulation of weld

图13 有限元计算节点破坏模式<br/>Fig.13 Failure modes of joints in finite element modeling

图13 有限元计算节点破坏模式
Fig.13 Failure modes of joints in finite element modeling

图14 节点试验曲线与有限元曲线比较<br/>Fig.14 Comparison of the load-displacement curves from finite element analysis and test results

图14 节点试验曲线与有限元曲线比较
Fig.14 Comparison of the load-displacement curves from finite element analysis and test results

表4 支管受拉、受压不锈钢节点有限元分析基本参数及结果<br/>Tab.4 Basic parameters and results of finite element analysis of stainless steel joints with branches under tension and compression

表4 支管受拉、受压不锈钢节点有限元分析基本参数及结果
Tab.4 Basic parameters and results of finite element analysis of stainless steel joints with branches under tension and compression

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备注

引言

1 试验研究

2 数值模拟与参数化分析

3 节点承载力计算公式

4 结论

期刊信息