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I read with interest the paper 'Natural frequencies of structures for designers'. Professor Bolton has shown that, with his approximate method, the natural frequencies of multistorey frames can be obtained within 3.3% accuracy. I have solved a three-bay, twostorey frame (which was also solved by Armstrong) using the method proposed by Professor Bolton. The calculations for this frame are given below:
The President and Mrs. Harris have now completed most of their visits to the Institution Branches in the UK and Ireland, and have asked that their thanks be offered to Branch Committees and members generally-and their ladies-for the many kindnesses that have been extended to them everywhere.
A question of responsibility
The problems of working in a team with other and independent professionals are ever with us; Mr. D. G. McBeth writes on the question of responsibility in such a situation:
The majority of contracts upon which I am engaged are being run under the RIBA conditions of contract. I have long been concerned about the position of the structural engineer, in that we are not legally part of the contract. Although we may be mentioned in the bills (but even this is not necessarily the case) all reference to the 'engineer' in specifications is usually deleted in favour of the 'architect', who is, therefore, 'responsible' for approving concrete mix designs, checking steel fabrication drawings, trussed rafter workshop drawings, etc.