Analysis of effective flange width in negative moment area of U-shaped steel concrete simply supported composite beams with external inversion
As a new type of composite beam,the effective flange width in negative moment area of U-shaped steel concrete simply supported composite beams with external inversion has been rarely studied.In order to explore the influencing factors of the effective flange width in negative moment area of this new type composite beam,based on the experimental research on the bending performance of negative moment area in our research group,the variation law of the effective flange width was analyzed using finite element software ABAQUS.The influence law of load type,width to span ratio(bf/L0)and height to thickness ratio(h/hf)on the effective flange width in the elastic and elastic-plastic stages was studied in detail for the mid span section.The research results indicate that under different load types,the effective flange width under uniformly distributed loads is greater than that under non-uniform loads.When bf/L0＜0.40,the value of β(effective flange width coefficient)is approximately equal to 1.00 and does not vary with the width to span ratio.When 0.40≤bf/L0≤1.00,the value of β decreases approximately linearly with the increase of the width to span ratio,during the elastic-plastic stage the value of β is slightly greater than that during the elastic stage,and the reduction rate is smaller than the latter.The effect of height to thickness ratio on the effective flange width can be ignored.Based on the finite element analysis results,a simplified calculation formula for the effective flange width was proposed and compared with the formula in Steel structure design standard(GB 50017-2017).The comparison results show that the calculation results of the formula in this article are better consistent with the finite element calculation results compared to the calculation results in Steel structure design standard(GB 50017-2017).The standardized calculation results differ significantly from the other two methods and tend to be conservative.
U-shaped steel concrete simply supported composite beam with external inversionnegative moment areaeffective flange widthfinite element analysissimplified formula
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NSTL
万方数据
维普
