19_HWKTTE 4004c - 9 Bearing formulas The FDOT under...

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9 Bearing formulas The FDOT under specification 455-5.11.3 recommends the following bearing formula for temporary timber piles driven with power hammers: 54 . 2 167 + = s E R (2-4) where R Safe Bearing Value, in Kilonewtons. s The Average Penetration per Blow, in Millimeters. E Energy per Blow of Hammer, in Kilojoules. The latter specification also clearly states that this formula should not be used to determine pile capacity of any other pile type. No other bearing formula is suggested in the specifications for concrete or steel piles. Dynamic load tests Dynamic load testing consists of predicting pile capacity from blows of the hammers during drive and/or redrive of an instrumented pile. Chapter 3 includes more details of how the dynamic load test is performed (see PDA and CAPWAP sections). Static load tests Static load testing consists of applying a static load to the pile to determine its capacity. The FDOT recommends the Modified Quick Test. For more details about the static load test, the reader is referred to the FDOT specification 455-2.2.1. Some general
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