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Title: A systematic approach for determining vertical pile depth of embedment in cohesionless soils to withstand lateral barge train impact loads
Authors: White, Barry C.
Ebeling, Robert M., 1954-
Keywords: Barge impact
Barge train impact
Flexible lock approach wall
Flexible approach wall
Guide wall
Guard wall
Vertical pile groups
Clustered pile groups
Depth of embedment
Pushover analysis
Impact deck
Impact beam
Pile bent
Flexural yielding
Pile hinge
Elevated deck
Publisher: Information Technology Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: ERDC/ITL;TR-17-2
Abstract: Abstract: Pile-founded flexible lock approach walls are typically constructed with impact beams simply supported on pile bents or by using an impact-deck supported by groups of clustered piles. Cast-in-drilled-hole (CIDH) reinforced concrete (RC) piles have seen recent widespread use as a cost-effective method of transferring superstructure loads to the foundation soil (e.g., cohesionless soils, like sand). The primary design load for lock approach walls are dynamic barge train impacts on a beam or deck which occur as the barge train aligns itself for entrance to the lock. These bents and decks are supported tens of feet (ft) above the mudline and barge impacts occur at the beam or deck level (i.e., lateral loading at approximately the top of the pile). Because of this lateral loading applied at the top of the piles, vertical pile groups must be designed to exhibit long-pile behavior (e.g., nominal change of deflection at the pile cap for a given load as the pile-tip depth-of-embedment increases). These design loads introduce substantial moments for the vertical piles at a short distance below the mudline. A pushover analysis of vertical-pile clusters can be performed to determine the energy absorption of the structure and the peak loads that cause the piles to hinge a short distance below the mudline, leading to collapse. This peak load is used to compare different pile depth-of-embedment procedures for long-pile behavior, and leads to the development of a new systematic procedure for defining this depth. Reducing the length of piles will result in a cost savings for Corps projects, especially for in-the-wet construction.
Appears in Collections:Technical Report

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