An investigation of hooped concrete columns . ogether and the columns then laid page 211 oown oh blocks on the wagon. Fig. 15^ shows a column in thecement laboratory bolted up ready for hauling. The 20-ft. col-umns were placed on an I-beam which was unloa-ded and handled inthe laboratory by using rollers. The five-ft. columns were readily walked into thetesting machine by one man, but it was necessary to U3e a hoiston the 10-ft. ones. The 20-ft. columns were run part of theway into the testing machine while on the I-beam. A chain at-tached to the column about 5 ft. from its upper end and to th
An investigation of hooped concrete columns . ogether and the columns then laid page 211 oown oh blocks on the wagon. Fig. 15^ shows a column in thecement laboratory bolted up ready for hauling. The 20-ft. col-umns were placed on an I-beam which was unloa-ded and handled inthe laboratory by using rollers. The five-ft. columns were readily walked into thetesting machine by one man, but it was necessary to U3e a hoiston the 10-ft. ones. The 20-ft. columns were run part of theway into the testing machine while on the I-beam. A chain at-tached to the column about 5 ft. from its upper end and to themovable head of the testing machine made it possible to liftthe column into position by running up the head of the raising the column, the lower end was rested on a boardplaced on two dollies. 7. pefore being placed in the testingmachine, the columns were prepared by locating and drilling thegage holes. It had been found that in taking readings on gagelines located on small round bars, the angle of the instrument. 15 had considerable influence on the readings obtained. This wasespecially true when the gage hole was not drilled exactly radi-ally in the bar. This difficulty was overcome in a large measurein these tests by grinding a small flat spot for each hole bymeans of an emery wheel attached to a flexible shaft run by amotor. This method was used in all the tests in this thesis and*proved very satisfactory. All of the gage lines for measuringlateral deformation had a gage length of four inches. The holes for the longitudinal gage lines were drilledin plugs set flush with the surface of the concrete at the pro-per distance apart. These plugs were made of l/2-in. roundbars cut to 1-in. lengths. The holes for these were drilledwith l/3-in. star drills, the top half of the hole being chippedto a larger size to allow room for enough plaster of pari8 tohold the plug steady. In setting, the holes were filled withplaster of paris and the plugs were then
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1914
