西安建筑科技大学学报(自然科学版)

针对带混凝土楼板的钢框架节点延性性能差,在梁下翼缘焊缝处易于发生破坏的不足,本文提出一种采用上窄下宽且仅梁下翼缘削弱的单轴对称钢梁截面的新型组合节点形式,运用有限元软件ABAQUS对其进行滞回性能研究。结果表明:梁翼缘的削弱方式以及钢梁上、下翼缘宽度比对组合节点的滞回性能有明显影响。合理的组合节点形式可有效缓解组合梁截面的中和轴上移,实现梁上塑性铰外移,提高组合节点的延性; 随着梁上、下翼缘宽度比的减小,组合梁截面中和轴逐渐下移,节点的承载能力以及延性有所提高,建议钢梁上、下翼缘宽度比的取值为:(0.6～0.9)。

The steel frame beam column joint with concrete floor slab has poor ductility, and the weld of the lower flange of the beam is prone to brittle failure. In view of the above shortcomings, this paper proposes a novel connection form of uniaxial symmetric composite joint with narrow upper flange and wide lower flange of the beam, which only weakens the lower flange of the beam. The finite element software ABAQUS was used to analyze the hysteretic performance of the proposed connection. Results show that the weakening form of beam flange and the size of upper and lower flanges have a great impact on the hysteretic performance. The reasonable form of composite joints can effectively alleviate the upward movement of the neutral axis of the composite beam section, realize the outward movement of the plastic hinge on the beam, and improve the ductility of the composite joints. With the decrease of the width ratio of the upper and lower flanges of the beam, the neutral axis of the composite beam section moves down gradually, and the bearing capacity and ductility of the composite connection can be improved. It is suggested that the width ratio of upper and lower flanges be 0.6 ～ 0.9.

引言
1 有限元模拟与验证
2 参数分析
3 结论

图1 新型组合节点形式<br/>Fig.1 Schematic diagram of novel composite joint

图1 新型组合节点形式
Fig.1 Schematic diagram of novel composite joint

图2 节点连接细部构造/mm<br/>Fig.2 Joints connection details/mm

图2 节点连接细部构造/mm
Fig.2 Joints connection details/mm

图3 节点域区网格划分<br/>Fig.3 Mesh generation of connection region

图3 节点域区网格划分
Fig.3 Mesh generation of connection region

图4 试验与有限元的破坏模式对比<br/>Fig.4 Failure modes comparison of test and FEM

图4 试验与有限元的破坏模式对比
Fig.4 Failure modes comparison of test and FEM

图5 滞回曲线对比<br/>Fig.5 Comparison of hysteresis curves

图5 滞回曲线对比
Fig.5 Comparison of hysteresis curves

图6 骨架曲线对比<br/>Fig.6 Comparison of skeleton curves

图6 骨架曲线对比
Fig.6 Comparison of skeleton curves

表1 WF系列模型参数取值<br/>Tab.1 Parameter value of WF series models

表1 WF系列模型参数取值
Tab.1 Parameter value of WF series models

表2 WT系列模型参数取值<br/>Tab.2 Parameter value of WT series models

表2 WT系列模型参数取值
Tab.2 Parameter value of WT series models

图7 WF系列模型滞回曲线<br/>Fig.7 Hysteresis curves of WF series models

图7 WF系列模型滞回曲线
Fig.7 Hysteresis curves of WF series models

图8 WF系列模型骨架曲线<br/>Fig.8 Skeleton curves of WF series models

图8 WF系列模型骨架曲线
Fig.8 Skeleton curves of WF series models

图9 WF系列模型梁腹板弯曲正应力分布<br/>Fig.9 Bending normal stress distribution of beam web of WF Series ModelsWF

图9 WF系列模型梁腹板弯曲正应力分布
Fig.9 Bending normal stress distribution of beam web of WF Series ModelsWF

表3 WF节点的承载性能及延性指标<br/>Tab.3 Bearing performance and ductility indexes of WF nodes

表3 WF节点的承载性能及延性指标
Tab.3 Bearing performance and ductility indexes of WF nodes

图10 WT系列模型滞回曲线<br/>Fig.10 Hysteresis Curve of WT Series Models

图10 WT系列模型滞回曲线
Fig.10 Hysteresis Curve of WT Series Models

图11 WT系列模型骨架曲线<br/>Fig.11 Skeleton Curve of WT Series Models

图11 WT系列模型骨架曲线
Fig.11 Skeleton Curve of WT Series Models

图12 WT系列模型梁腹板弯曲正应力分布<br/>Fig.12 Bending normal stress distribution of beam web of WT Series Models

图12 WT系列模型梁腹板弯曲正应力分布
Fig.12 Bending normal stress distribution of beam web of WT Series Models

表4 WT节点的承载性能及延性指标<br/>Tab.4 Bearing performance and ductility indexes of WT series joints

表4 WT节点的承载性能及延性指标
Tab.4 Bearing performance and ductility indexes of WT series joints

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备注

引言

1 有限元模拟与验证

2 参数分析

3 结论

期刊信息