Resistance factors for construction control for redundant pile groups
| Theoretical analysis | Construction control (field verification)a | Resistance factorb | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Driving criteria basis | PDA/Capwap | Retap test 3 d after EOD | Static pile load test | Cohesive | Mixed | Non-cohesive | ||||
| Iowa ENR formula | WEAP | φ | φ EOD | φ set-up | φ | φ | ||||
| Iowa Blue Book | Yes | — | — | — | — | 0·55 | — | — | 0·55 | 0·50 |
| — | Yes | — | — | — | — | 0·65 | 0·20 | 0·65 | 0·55 | |
| — | Yes | — | 0·70 | — | — | |||||
| Yes | — | — | — | 0·75 | 0·40 | 0·70 | 0·70 | |||
| Yes | — | 0·80 | — | — | ||||||
| — | — | Yes | 0·80 | — | — | 0·80 | 0·80 | |||
| Theoretical analysis | Construction control (field verification) | Resistance factor | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Driving criteria basis | PDA/Capwap | Retap test 3 d after EOD | Static pile load test | Cohesive | Mixed | Non-cohesive | ||||
| Iowa ENR formula | WEAP | |||||||||
| Iowa Blue Book | Yes | — | — | — | — | 0·55 | — | — | 0·55 | 0·50 |
| — | Yes | — | — | — | — | 0·65 | 0·20 | 0·65 | 0·55 | |
| — | Yes | — | 0·70 | — | — | |||||
| Yes | — | — | — | 0·75 | 0·40 | 0·70 | 0·70 | |||
| Yes | — | 0·80 | — | — | ||||||
| — | — | Yes | 0·80 | — | — | 0·80 | 0·80 | |||
Refer to specified construction control that is required to achieve the target nominal driving resistance
Resistance factors are rounded to the nearest 0·05. Resistance factors should be reduced by 20% for non-redundant pile groups
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