Bending Moment & Shear force Calculator > Instructions for simple beam

Instructions for using Bending Moment Calculator for simple beam

(i). Sign convention The loads acting upward are considered as positive while the downward loads are taken as negative. Shear force at the left of a section is positive if acting upward whereas it is negative if acting downward. Sagging bending moment is taken as positive and hogging as negative. The clock-wise moments are negative and anticlock-wise as positive.

(ii) All the distances should be measured with reference to the origin of axes which is taken at the extreme left end of the beam. All the distances should be entered in meter and load in kN. It will give the values of BM in kNm and SF in kN. While applying the load, keep in mind that the load should not be outside the span of the beam.

(iii) You can also quickly get the Bending Moment values at different sections of the beam, just by changing the position of section "x". But keep in mind that the value of "x" should not be more than span of beam.

(iv) In case of more than one load, take the sum of the results of all the cases (using principle of superposition). Calculated values can be used to plot the bending moment diagram.

You can go back to calculator page or select from the following loading cases to start calculation.

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