... ) . Figure 6 shows plots of torsional moment against angle of twist of the three groups of specimens. Crack initiation and yield points of the transverse and longitudinal torsional reinforcements are indicated with different markers. The calculated torsional strengths (T_{n-ACI) according to ACI}...

... from the literature and compares their results with the corresponding values calculated using two existing rational formulae for RC, and develops a series of noniterative formulae that facilitate the direct calculation of T_cr, the cracking angle of twist and the initial torsional...