钢结构基本原理课件 (24).ppt

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1、Basic Principles of Steel StructuresDesign method of Fillet Welds in China6.6.1 Constitution of Fillet Welds6.6.2 Calculation of Fillet Welds Commonly Used in China6.6.1 Constitution of Fillet WeldsGeometrical parameters of of fillet weld1.1.Fig.6.28 Throat of fillet weld.hfhehh1h2delwhfhe=ff450450W

2、eld foot size hf.1 1Effective height he=0.7hf.2 2Effective area Ae=helw.3 36.6.2 Calculation of Fillet Welds Commonly Used in ChinaFillet welds between two plates1.1.（1）Side fillet weldFig.6.29 Throat of fillet weld.NNNNlwStress at the most dangerous point A:1 1 where N Design value of axial tensile

3、 force;lw Effective length fillet weld;ffw Design strength of fillet weld.6.6.2 Calculation of Fillet Welds Commonly Used in ChinaFillet welds between two plates1.1.（2）Front fillet weldFig.6.30 Throat of fillet weld.NNNNlwStress at the most dangerous point A:1 1 where f Strength increasing coefficient of front fillet weld.6.6.2 Calculation of Fillet Welds Commonly Used in China（1）Under the action of MomentFig.6.31 Stress distribution of fillet subject to moment.Fillet welds between column and plate2.2.hehetStress at the most dangerous point A:1 1 A M where Ww Section modulus of fillet weld.