End Block Stresses in Post-tensioned Concrete Beams

The paper suggests an analytical method for evaluating the tensile stresses present within a short end block and in the web of the adjacent I-beam section. It is intended primarily for use with beams prestressed by external cables, but is not confined to these. J. R. RYDZEWSKI and F. J. WHITBREAD

The Index of Computer Programmes now maintained in the Institution’s Library contained, at the end of 1962, about 150 items, under the following headings: aircraft and ships (3), arches (3), bridges (13), chimneys (2), composite action (7), continuous beams (7), general mathematical (lo), jetties (3), piles (3), piping (4), plane frame structures (47), plates and slabs (4), properties of sections (9), shells (6), soil mechanics (7), stairs (2), tanks (2), vibration (3) and miscellaneous (10). The compilation of the Index was recommended by the committee responsible for the Institution Report on ‘The Use of Digital Computers in Structural Engineering’, published in May 1962. (Copies of this report are still available price 10s. 6d. post free.)

One pier and two spans of the bridge were demolished when two barges collided with it in October 1960. An investigation was instituted, for insurance purposes, to determine the degree to which the damage could be attributed, in whole or in part, to one or more of the possible causal factors, which were collision, explosion or fire. This investigation necessitated an above- and below-water survey and examination of the remaining and demolished structures. Peter Mason