Large diameter dolphin piles: The effect of the inner soil on their local buckling resistance

Even though for most hydraulic and geotechnical structures clear guidelines are available, those for flexible dolphins are still missing. Consequently, whether a design is safe is usually subject of debate. Economical dolphin piles are large diameter tubular piles, susceptible to local buckling. After installation the embedded part of these...

Schelpfactoren bij door grond horizontaal belaste palen

Piles subjected to horizontal soil displacements are a common phenomenon at constructions next to soil embankments, for example an abutment of a bridge. Shell factors play an important role in the analysis of these piles with 2-dimensional (2D) design methods. This study investigates if the limitations of a 2D method, in relation to the 3...

Investigation into soil displacement near a jacked-in pile in sand

When a pile is driven into soil, the soil is pushed away which results in significant changes in both stress state and strain state. Using Finite Element Code to simulate the pile installation process has been not yet completely successful partly due to the limited knowledge of the governing behavior of the soil around a displacement pile. An...

The effect of loading rate on pile bearing capacity of saturated sand

Pile load tests are commonly used by engineers to determine its bearing capacity. At present, there are three methods of pile load tests: the static, the dynamic and the quasi-static test. The static pile load test is done by applying an axial load on the pile with a long duration. The dynamic and quasi-static tests are done with an impact load...

Influence of loading rate on pile capacity in unsaturated sand

When in-situ tests are performed to determine the ultimate capacity of a pile after the installation, quite a lot of types of tests are available. The following tests are generally used, in order from most used method to least used method: the static testing method, dynamic testing methods, pseudostatic and statnamic testing methods. During a...

Pushover analysis of a fixed steel offshore platform - Part I: Beam-column and strut elements in the INTRA program. Part II: Piles and pile groups under extreme loads

Part I: The computer program INTRA models the collapse behavior of trusswork offshore structures with the aid of two types of elements: 'Beam-column' elements, designed to simulate bending dominated failure of structural members, and 'strut' elements, that can represent normal force dominated failure. The behavior of both types of INTRA elements...