464

DEFLECTION OF CONTINUOUS BEAMS.

The mean weight on each of the outside supports A andD, in terms of the leverage as above, was 7 '53 ; the meanweight on each of the middle supports B and C was 21 -78 ;giving the total weight of the rod

1 58-62 „ ,,

= 2 x ~nr = 1-63 bs ‘

The absolute values, therefore, of the pressures given bythe experiment are as follows :—

Lbs.

On support A.= 0-210

„ „ B.= 0-605

„ „ C.= 0-605

„ „ D.= 0-210

Total weight of rod .. 1-630

The calculated pressures may be obtained from EquationLVIII.; P, being the pressure on the supports A and D,and P 2 that on the supports B and C. Taking, then, asbefore, pi = 0 - 543lb., we have the following values:—

Lbs.

On support A.= -217

» B.= -598

„ „ C.= -598

„ » D.= 217

1-630

Experiment 2.

A Continuous Beam supported at Five Points.

The following experiment was made by the Author toimitate the conditions of the Britannia Bridge.

A rod of uniform red Memel deal, ^ inch square, and 33feet long, was supported at five points.

The two central spans were 11 feet each, and the sidespans 5' 6" each.