Simplified Analysis Procedures for Flexible Approach Wall Systems Founded on Groups of Piles and Subjected to Barge Train Impact.

摘要

One type of flexible substructure used for new flexible approach wall structural system designs in the Corps is flexible pile groups. Simplified analysis procedures for flexible approach wall systems founded on groups of piles and subjected to barge train impact is discussed in this report. Pile bent groups of vertical piling and batter piling are investigated. A 'balance of energy' design procedure is presented. This procedure assumes that all the kinetic energy (KE) of the approaching barge train (normal to the wall) is converted to potential energy (PE), or strain energy, through deformation of the flexible piling. A pushover analysis technique is used to establish the potential energy (PE) capacity and displacement capacity of individual pile groups accounting for the various pile failure mechanisms. The total stored energy (PE) of the approach wall system will be the sum of the stored energy of all the pile groups reacting to the barge impact. With three-dimensional (3-D) structural detailing of the impact deck (or beam), a model can be created where barge train impact loading may be shared by nearby supporting pile bents. The performance of this type of flexible approach wall system is also investigated.