波形钢腹板组合梁挠度计算方法对比

波形钢腹板的剪切变形对组合梁挠度影响显著,不同计算方法结果差异明显。以波形钢腹板组合梁典型结构体系(简支梁和悬臂梁)为研究对象,基于5种计算理论——经典梁法、Timoshenko梁法、弹性剪切变形法、有效刚度法、三角级数理论,通过对比其假设和计算公式,建立空间有限元模型分析在跨中集中荷载和均布荷载作用下不同挠度计算方法的精度,总结适用不同跨高比区间的计算方法。建议简支梁在集中荷载或均布荷载作用下需要考虑剪切变形的跨高比限值均取35;对于悬臂梁,跨高比限值则分别取10,14. 5。

Comparation of Deflection Calculation Methods for Composite Beam with Corrugated Steel Webs

The shear deformation of corrugated steel webs has signif icant inf luence on the def lection of composite beams,and the results of different calculation methods are obviously different.Taking a typical structural system of corrugated steel web composite beams (simply supported beams and cantilever beams) as the research object,based on f ive different calculation theories-classical beam method,Timoshenko beam method,elastic shear deformation method,effective stiffness method and trigonometric series theory,and by comparing their assumptions and calculation formulas,a spatial f inite element model was established to analyze the accuracy of different def lection calculation methods under the actions of concentrated load in the midspan and uniform loads.The calculation methods for different span-height ratios were summarized.It is suggested that the span-to-height ratio limit of simply supported beams under concentrated load or uniform load need to consider shear deformation is 35,while for cantilever beams,the span-to-height ratio limit under concentrated load or uniform load are 10.0 and 14.5 respectively.