Author: Horne, M R;Narayanan, R
First published: N/A
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Horne, M R;Narayanan, R
Dr. Nwokoye has written in reply to Mr. Sykes' comments on timber grading and the relationship of strength to elastic modulus in timber (June 1976), comments which were stimulated by a paper by Dr. Nwokoye in the March 1976 issue. Dr. Nwokoye's observations are fairly lengthy by the standards considered appropriate to this column and we have been making rather an issue concerning brevity recently; neverthless what Dr. Nwokoye has to say is likely to attract the close attention of some members and may stimulate further discussion which could be of interest at a time when a new limit state code for timber is being formulated. So as to maintain a semblance of our real concern for brevity in contribution we are putting this one at the end of the column where it can masquerade as a separate article, or a reply to a discussion on a paper, which it is.
In this paper the behaviour of reinforced and unreinforced masonry is considered. Tests on eccentrically-loaded unreinforced walls and couplet specimens are reported and a simple theoretical approach for solid block masonry is derived. A method of predicting wall strength is presented. Additional tests are described on reinforced masonry sections subjected to lateral loading only and the simple ultimate load theory used for reinforced concrete is shown to give a good indication of the ultimate strength of the sections. The effect of employing different values of the partial factor of safety for strength of the masonry is considered. It is indicated that present design procedures using permissible stresses result in uneconomic design.
W.B. Cranston and J.J. Roberts
Towards a unified stress grading for timber
It is hoped that this correspondence on the above title will cover most of the interesting points raised by Mr. J. K. Sykes (M) in the Verulam column, June 1976, page 233.
Dr. D.N. Nwokoye