Handbook of Civil Engineering Calculations

(c) Bending-moment diagram

FIGURE 5

SHEARING STRESS IN A BEAM-

EXACTMETHOD

Calculate the maximum shearing stress in a Wl8 x 55 beam at a section where the verti-
cal shear is 70 kips (311.4 kN).

Calculation Procedure:

1. Record the relevant properties of the member
   The shearing stress is a maximum at the centroidal axis and is given by v = VQI(If). The
   static moment of the area above this axis is found by applying the properties of the WT9 x

(b) Sheer diagram

(a) Force diagram