DEADMAN OFFSET ANGLE (OI )TYPE OF ASSEMBLYCURRENT VELOCITYTM 5-5420-278-100035 000035 00-24BRIDGE ANCHORAGE (Contd)TOWER-TO-DEADMAN OFFSETJust as it was necessary to calculate the distance at which to place the towerupstream from the bridge centerline, it is now necessary to determine the distanceat which to place the deadman upstream from the tower. This distance is called thetower-to-deadman offset, or O2. To calculate, use the formula:O2 = (C x O2 ft)where O2 ft is a factor determined from table 10, and C is the tower-to-deadman distance (in feet).A slightly more accurate means of positioning the deadman is to determine theexact angle at which the deadman should be placed in relation to the tower (refer totable 11) and place the deadman at the calculated distance (C) along that angle. Theslight difference between the two methods is negligible to the extent that thedifference will not cause the system to fail.DEADMAN OFFSET FACTOR (O2)TYPE OF ASSEMBLYCURRENT VELOCITYTable 10. Determination of the Deadman Offset Factor (O2).3 feet/sec5 feet/sec7 feet/sec9 feet/sec11 feet/sec(0.9 meters/sec) (1.5 meters/sec) (2.1 meters/sec) (2.7 meters/sec) (3.4 meters/sec)Normal.09.11.14.17.19Reinforced.11.14.17.19.233 feet/sec5 feet/sec7 feet/sec9 feet/sec11 feet/sec(0.9 meters/sec) (1.5 meters/sec) (2.1 meters/sec) (2.7 meters/sec) (3.4 meters/sec)Normal5°6.5°8°9.5°11°Reinforced6.5°8°9.5°11°13°Table 11. Alternate Means of Determining Deadman Offset.
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