西安建筑科技大学学报(自然科学版)

部分连接钢构件由于存在剪切滞后现象,截面强度不能充分发挥,在设计中应予以足够重视.针对侧面角焊缝连接轴心受力板件,基于应力扩散概念,建立弹性和弹塑性剪切滞后模型,并借助有限元分析软件以及应力扩散角的计算可较为准确地获得危险截面上的正应力分布.通过与国外相关标准、试验数据进行对比分析,结合危险截面的塑性区范围,提出了剪切滞后系数的实用计算公式,以便工程设计应用.

The section strength of steel member by partly connecting could not be fully realized due to the presence of shear lag, which should be given more attention. Based on the concept of stress diffusion, the elastic and elastic-plastic models for shear lag of axial forced plate connected by side fillet weld are established. With the help of the finite element analysis software, the normal stress distribution could be obtained accurately through the calculation of stress diffusion angle. Compared with foreign standards and test data, and considered the plastic range at critical section, the practical formula for shear lag coefficient is obtained for design purpose, which could be used easily and conveniently.

引言
1 剪切滞后模型
2 试验研究与数值模拟
3 弹塑性计算及应力分布
4 剪切滞后系数实用计算公式
5 结语

图1 侧面角焊缝连接轴心受力板件<br/>Fig.1 Axial forced plate with side fillet weld connection

图1 侧面角焊缝连接轴心受力板件
Fig.1 Axial forced plate with side fillet weld connection

图2 侧面角焊缝的应力传递<br/>Fig.2 Stress transfer of side fillet weld

图2 侧面角焊缝的应力传递
Fig.2 Stress transfer of side fillet weld

图3 弹塑性正应力分布<br/>Fig.3 Elastic-plastic normal stress distribution

图3 弹塑性正应力分布
Fig.3 Elastic-plastic normal stress distribution

表1 试验结果
Tab.1 Experimental results

图4 试件有限元模型<br/>Fig.4 Finite element model of test specimen

图4 试件有限元模型
Fig.4 Finite element model of test specimen

图5 P-L1试件连接处的应力分布<br/>Fig.5 Stress distribution at the joint of P-L1 specimen

图5 P-L1试件连接处的应力分布
Fig.5 Stress distribution at the joint of P-L1 specimen

表2 试验值与计算值对比<br/>Tab.2 Comparison of test data and calculated value

表2 试验值与计算值对比
Tab.2 Comparison of test data and calculated value

表3 弹性分析计算结果<br/>Tab.3 Calculation results of elastic analysis

表3 弹性分析计算结果
Tab.3 Calculation results of elastic analysis

图6 危险截面的正应力分布<br/>Fig.6 Normal stress distribution at critical section

图6 危险截面的正应力分布
Fig.6 Normal stress distribution at critical section

表4 弹塑性分析计算结果<br/>Tab.4 Calculation results of elastic-plastic analysis

表4 弹塑性分析计算结果
Tab.4 Calculation results of elastic-plastic analysis

图7 危险截面的弹塑性正应力分布(η=0.9)<br/>Fig.7 Elastic-plastic normal stress distribution at critical section(η=0.9)

图7 危险截面的弹塑性正应力分布(η=0.9)
Fig.7 Elastic-plastic normal stress distribution at critical section(η=0.9)

表5 剪切滞后系数及塑性区范围<br/>Tab.5 Shear lag coefficient and plastic range

表5 剪切滞后系数及塑性区范围
Tab.5 Shear lag coefficient and plastic range

表6 剪切滞后系数的取值比较<br/>Tab.6 Comparison of shear lag coefficients

表6 剪切滞后系数的取值比较
Tab.6 Comparison of shear lag coefficients

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备注

引言

1 剪切滞后模型

2 试验研究与数值模拟

3 弹塑性计算及应力分布

4 剪切滞后系数实用计算公式

5 结语

期刊信息