Laundromat units

Usage examples of loads.

The results of experiments with short walls carried out in 1896-1897 by the Royal Institute of British Architects to determine the average loads per sq.

As railway loads increased and greater spans were demanded, the Howe truss was stiffened by timber arches on each side of each girder.

This bridge has now been replaced by a stronger bridge to carry the greater loads imposed by modern traffic.

In manufacturing districts and near large towns loads of 30 tons may come on road bridges, and county and borough authorities insist on provision being made for such loads.

Bridges would then be designed for these selected loads, and the process would be safer in dealing with flooring girders and shearing forces than the assumption of a uniform load.

If the loads on the right of the section are considered the expressions are similar and give the same results.

Hence, for uniform travelling loads, the bending moments are greatest when the loading is complete.

Hence, if the average load to the left of a section is greater than that to the right, the bending moment at the section will be increased by moving the loads to the right, and vice versa.

Hence the maximum bending moment at C for a series of travelling loads will occur when the average load is the same on either side of C.

If one of the loads is at C, spread over a very small distance in the neighbourhood of C, then a very small displacement of the loads will permit the fulfilment of the condition.

Hence the criterion for the position of the loads which makes the moment at C greatest is this: one load must be at C, and the other loads must be distributed, so that the average loads per ft.

If the loads are very unequal in magnitude or distance this condition may be satisfied for more than one position of the loads, but it is not difficult to ascertain which position gives the maximum moment.

Generally one of the largest of the loads must be at C with as many others to right and left as is consistent with that condition.

The greatest bending moment will occur with one of the greatest loads at the section, and when this further condition is satisfied.

The three lightly dotted parabolas are the curves of maximum moment for each of the loads taken separately.