It follows from the lower-bound theorem of plasticity that a maximum of the lower bounds for the failure load of concrete webs in shear is determined if the strut angle is chosen in such a way that (illustrated in Fig. 1)
It follows from the lower-bound theorem of plasticity that amaximum of the lower bounds for the failure load of concrete websin shear is determined if the strut angle is chosen in such a way that(illustrated in Fig. 1)