Today, I am going to discuss about the design strength calculation of laterally supported beamwith high shear. In last lecture we have discussed the design procedure for calculating thesection size of a laterally supported beam member due to low shear and we have seen how tocalculate the design bending strength due to low shear. Now in case of high shear, we haveseen that certain reduction will occur in the bending strength calculation, because of the highshear.
Example: Design a laterally supported beam of effective span 5 m for the following data.Grade of steel: Fe 410Factored maximum B.M. = 180 kN-mFactored maximum S. F. = 220 kNCheck for deflection is not required
Check for web buckling (at support)Web buckling check is not required in general asdtw=295.27.4=39.9 < 67ϵHowever, it is a case of high shear, web buckling check should be applied.Assume a stiff bearing length, b = 100 mm
So what we have seen an example, to find out a beam section, because of high shear.So in case of high shear, we need to evaluate the reduction factor bending strengthcalculation, right. That reduction factor will be calculated based on the full bending strengthfor plastic section without shear area. So from those data we can finally find out the modifiedbending strength of the whole section due to high shear. So this is how we calculate. So thankyou.
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