Proceedings of the Annual Convention (Volume 22 (1921))

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...to stringers and channels and stulf of that kind, where they carry stresses, they are figured. It seems to me that idea covers it and we do not need the other. Mr. O. E. Selby (Cleveland, Cincinnati, Chicago & St. Louis): ----I think the proposed increase is to reduce the deflection and make a stifier girder. I therefore move that we add to that sentence to reduce the deflection to the desired amount. Mr. Condron: --Would it-not be clearer, instead of saying that proper increase shall be made to the flange sections, to say proper decrease shall be made to the allowable unit strains? A proper decrease to be made to the flange section might mean that we have proper increase if we have less depth of girder, and then we would have more increase in the section. I think it would be better if you say some definite ratio of decrease shall be made to the allowable unit stress. Mr. Mills: --Referring to the question as to the meaning of paragraph 33, where reference is made to proper increase in the flange sections where shallow girders are used, this is a proper and necessary provision, which I have observed in many instances, increasing the tlange areas to reduce the unit stress and thereby bring the deflection within proper limits. Mr. Snow: --VVc want to make the girders equally stiff and rigid. The reason why we did not say use decreased unit strain instead of increased section is that the specification is based on a flat unit, and we wanted to carry it out in all cases where possible. The same thing can be done whether you decrease the section or increase the unit strain. Vice-President Kelley: --The hour having come for adjournment, we will be obliged to discontinue the discussion. The Committee asks that the members pass on the...