## Longitudinal shear

The shear stress in the vertical plane between the flange and web should be assessed according to section 6.2.4 and Figure 6.7 of the Eurocode (reproduced here as Figure 13). The change in force in the flange can be assessed from the moment and lever arm at a particular location. The Eurocode states that the maximum length that can be considered for the change in force is half the distance between the maximum moment and the point where the moment is zero. Clearly, the maximum longitudinal force will occur where the change in moment, and therefore force, is the greatest; for a uniformly distributed load on a continuous beam this will be the length of beam closest to the support.

Figure 14 shows a flow chart for assessing the longitudinal shear capacity; in many cases the transverse reinforcement in the slab will be sufficient to resist the shear force. This check is included to ensure that where particularly thin flanges are used there is adequate reinforcement. The longitudinal shear capacity is based on the variable strut inclination method, which was described in the section on vertical shear.

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