Design of Doubly Reinforced Beams and Tests on Construction Joints. Discussion on the Paper by Mr. E

A SINGLY reinforced rectangular beam designed in accordance with the provisions of the cbde of practice for A 1:2:4 concrete with steel to B.S.S. No. 15 stressed to 20,000 lbs./in.2, has a value for Q (= MR/bd2) at working load of from 130 to 206, according to the quality of the concrete. If such a beam is tested to destruction the ultimate value of Q is unlikely to reach two and a half times the above values. R.H. Squire

This month's letters include discussion over design checks and suitably experienced engineers as well as seismic design of masonry and more.

The tragedy of the Francis Scott Key Bridge highlights the need for structural engineers to ensure that the risks inherent in our built infrastructure remain acceptable, argues Colin Caprani.