Before revision: The adaptation of Kirkpatrick Rankin & Long’s punching strength prediction method for laterally restrained bridge deck slabs, given in BD 81/02, is summarised as follows: The concrete equivalent cylinder strength, , is given by: The plastic strain value, , of an idealised elastic-plastic concrete is given by: The non-dimensional parameter, , for the arching moment of resistance is given by: In order to treat the slab as restrained, must be less than 0.26.
After revision: ,The adaptation of Kirkpatrick Rankin & Long’s punching strength prediction method for laterally restrained bridge deck slabs, given in BD 81/02, is summarised as follows: The concrete equivalent cylinder strength, , is given by: The plastic strain value, , of an idealised elastic-plastic concrete is given by: The non-dimensional parameter, , for the arching moment of resistance is given by: In order to treat the slab as restrained, must be less than 0.26.