Sessional papers of the Dominion of Canada 1909 . ays a danger of the toe of the wall crumbling whilst resisting againstthe overturning moment. This crushing strain can be calculated by the following formula:—_ Weight 6 X Weight x centre of base to Eesultant Base Base If we apply this formula to the wall in fig. 3, we have Max. pressure at toe = P = 187,500 6 X 187,500 X = 15,191 lbs. = tons 36 36 X 36 per sq. foot. Trautwine gives from 12 to 18 tons per square foot as the crushing load ofordinary concrete one month old, so we are on the safe side. ABUTMENT AVALLS. Hydrostatic Pressur
Sessional papers of the Dominion of Canada 1909 . ays a danger of the toe of the wall crumbling whilst resisting againstthe overturning moment. This crushing strain can be calculated by the following formula:—_ Weight 6 X Weight x centre of base to Eesultant Base Base If we apply this formula to the wall in fig. 3, we have Max. pressure at toe = P = 187,500 6 X 187,500 X = 15,191 lbs. = tons 36 36 X 36 per sq. foot. Trautwine gives from 12 to 18 tons per square foot as the crushing load ofordinary concrete one month old, so we are on the safe side. ABUTMENT AVALLS. Hydrostatic Pressure transmitted hy Loch Gates to Abutment of gate = length of leaf x height = A B x H Mean hydrostatic pressure = —~ x lbs. Total pressure on leaf = area of gate x mean pressure = QQ = HxABx—^ x lbs. (See fig. 4.) 2i This pressure is applied in the centre of the gate leaf and at one-third of theheight above the recess floor. The water pressure is transmitted to the hollow quoin by the heel post and can bethus Abutment Wall Let us calculate the reaction T at the heel post:— If we call a the angle of the gate with the normal to the face of the wall (in ourcase 21° 48) and A B the total length of the gate leaf (in our case 38) we have, bymoments about B 456 DEPARTMENT OF PUBLIC WORKS 8-9 EDWARD VII., A. 1909 Q X ^^ = TX A B sin a T= Q 2 sin a — = Reaction T, reaction = T, resultant tlinist = Q 2 sin a It will thus be seen that the res\iltant thrust T from the water press\ire Q on thegate will be applied at the centre of heel post at an angle 2 a from the normal to theface of the wall.
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