Sanitary engineering : a guide to the construction of works of sewerage and house drainage, with tables for facilitating the calculations of the engineer / by Baldwin Latham.

Date:
1873
Catalogue details

Licence: Public Domain Mark

Credit: Sanitary engineering : a guide to the construction of works of sewerage and house drainage, with tables for facilitating the calculations of the engineer / by Baldwin Latham. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

    170/412 (page 150)
    Mode of taking dimensions. One-fourth the brea]<ing weiglit the limit of safety. Beams loaded at intermediate points. Beams uni- formly loaded. Formulae for strength of beams. between the supports in inches, and the quotient will be the greatest weight the beam will bear in lbs. If the beam is not placed horizontally, the distance between the supports must be measured horizontally, and will be the length of bearing. A fourth of the breaking weight, as given by the formulae, will bo the greatest load to which a beam ought to be subjected in practice. When the load is applied at any other point than the middle, it will be as the rectangle of the segments, into which the point divides the distance between the supports, is to the square of half that distance; so is the weight found by the rule to tlie weight the beam will sustain at the given point. When a beam is uniformly loaded, its breaking weight is twice that of a beam whose load is applied at the centre. The following formulae of Professor Barlow will give all the information required for calculating the strength and other particulars of beams, &c. 1. When the beam is fixed at one end and loaded at the other. S rt zw a - / nv ^ rt b In square beams 3 /ZW 2. When supported at one end and loaded in the middle. In this case therefore 4:ad'^S W = a = 4 a d S W rw_ ZW 4aS In square beams 3 /ZW « = cZ= V Jg-