Abstract
Determination of the Pile Stiffness Matrix Based on the Pile Load Test Results and the Effect of Pile Interaction
Highlights
For the needs of modernization of the NIS oil refinery in Pancevo, depending on the size of the building, shallow and deep foundations were designed
The paper presents the determination of the elements of the pile stiffness matrix based on pile load test results, made for the needs of modernization of oil refinery for NIS in Pancevo
The effect of the pile interaction for horizontal and vertical loads was introduced in an approximate way, through the reduction of coefficients of the stiffness matrix
Summary
For the needs of modernization of the NIS oil refinery in Pancevo, depending on the size of the building, shallow and deep foundations were designed. With the assumption that the soil can be approximated by the Winkler model, on the basis of the results of horizontal pile load test, pile length and cross section area as well as pile stiffness, it is possible to analytically determine (Hetenyi [1], Barber [2]) the flexibility coefficients for horizontal load. After the pile interaction factor for vertical loading and coefficients of reduction for horizontal loading have been determined, it is possible to estimate the flexibility and stiffness matrix for each pile in the group. The obtained pile matrices contain the stiffness of the soil and the pile at workload level and the pile interaction in the group at horizontal and vertical load. The cap position can be described with a total of 3 translation and 3 rotation components, which can be determined by kinematic and equilibrium conditions
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