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3305.3.2.3 Lateral Concrete Pressure
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Design of forms, ties and bracing shall satisfy the minimum lateral pressures of fresh concrete specified in Table 3305.3.2.3.
TABLE 3305.3.2.3 MINIMUM LATERAL PRESSURES TO BE ASSUMED FOR FRESH CONCRETE WEIGHING 150 POUNDS PER CUBIC FOOT a, b, c
TABLE 3305.3.2.3 MINIMUM LATERAL PRESSURES TO BE ASSUMED FOR FRESH CONCRETE WEIGHING 150 POUNDS PER CUBIC FOOT a, b, c
| TYPE OF WORK | MINIMUM LATERAL PRESSURE ASSUMED (PSF) | LIMITATIONS |
| Columns: Ordinary work with normal internal vibration | p = 150 + (9000R/T) | Maximum 3,000 psf or 150h, whichever is less |
| Walls: Rate of placement at 7 feet per hour or less | p = 150 + (9000R/T) | Maximum 2,000 psf or 150h, whichever is less |
| Walls: Rate of placement at greater than 7 feet per hour | p = 150 + (43400/T) + (2800R/T) | Maximum 2,000 psf or 150h, whichever is less |
| Slabs | p = 150h | None |
| For SI: 1 inch = 25.4 mm, 1 foot per second = 0.305 m/s, 1 pound per cubic foot = 16.02 kg/m3, 1 pound per square foot = 4.882 kg/m2, °C = (°F-32)/1.8. |
| where: |
| R = rate of placement, feet per hour. |
| T = temperature of concrete in the forms, °F. |
| h = height of fresh concrete above point considered, feet. |
| a. Allowances for change in lateral pressure shall be made for concrete weighing other than 150 pcf; for concrete containing pozzolanic additions or cements other than Type I, for concrete having slumps greater than 6 inches, or for concrete consolidated by revibration or external vibration of forms. |
| b. Where retarding admixtures are employed under hot weather conditions, an effective value of temperature less than that of the concrete in the forms shall be used in the above formula. |
| c. If retarding admixtures are used in cold weather, the lateral pressure may be assumed as that exerted by a fluid weighing 150 pcf. |
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