Mill Building Construction PDF Download

Excerpt from Mill Building Construction Mill buildings differ so greatly in character and purpose that it is impossible to formulate tables of dead weights which will suit all cases. The use to which the building is to be put, its location, the character of the roof covering, the presence or absence of cranes, etc., all affect the dead weight, and generally each case must be considered individually. For most purposes of design the loads may be divided into: (1) roof loads; (2) floor loads; (3) crane loads; (4) snow and wind loads, and (5) miscellaneous loads. Roof Loads. - For making rough estimates the diagram of weights of roof trusses given in Fig. 1 will prove useful. These weights have been figured separately and do not quite agree with any of the published formulas. From this diagram, the table (Table I.) giving the weights of roof coverings and the table (Table III.) of wind and snow loads, the total weight to be carried is found. Were it possible to realize in actual practice the small sections required, the weight of trusses would be directly proportional to the load carried. Iron purlins weigh from 2 lbs. to 4 lbs. per square foot of ground covered, according to the spacing of the trusses. Good practice in the United States requires that roofs in northern latitudes shall be figured for at least 40 lbs. per square foot of roof surface. Floor Loads. - The Building Law of New York City requires that floors shall be proportioned to carry the following minimum loads per square foot: Office buildings, 100 lbs.; public halls, 120 lbs.; stores, factories, warehouses, etc., 150 lbs.; floors carrying heavy machinery, 250 lbs. to 400 lbs. In every case the floor must be strong enough to carry its maximum load. Mr. C. J. H. Woodbury, in his book on "The Fire Protection of Mills," gives a table of weights per square foot of floor of various kinds of merchandise, which is reprinted herewith (Table I.) and which will be found valuable in determining loads on floors. Crane Loads. - For small traveling cranes of one or two tons capacity it is safe to consider the total weight of one end of the crane and its load as twice the capacity of the crane. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.