Section 24(5)(c) in The Opening of Delhi Metro Railway for Public Carriage of Passengers Rules, 2002
(c)the calculations, stress sheets must show, as to what allowance has been made for any secondary or deformative stresses in addition to the primary stresses caused by the external forces and what relief of stress, if any, has been included. The Commissioner may ask for necessary tests to be carried out on bridges as referred to in sub-rule (2) of Rule 14 ;