SVIBOR - Project code: 2-11-065


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


SVIBOR - Collecting Data on Projects in Croatia

Project code: 2-11-065


Main researcher: VERIĆ, FRANJO (74774)

Type of research: developmental
Duration from: 01/01/91. to 12/31/95.

Papers on project (total): 13
Institution name: Građevinski fakultet, Zagreb (82)
Department/Institute: Geotechnical Department
Address: Fra Andrije Kačića Miošića 26, 41000 Zagreb
City: 10000 - Zagreb, Croatia
Phone: 385 (0)41, 442-600, 541-185
Fax: 385 (0)41, 416-621

Summary: In the framework of this project two problems have beeninvestigated: - Relationship of pile deformation and its potential energy at horizontal loading due to ship impact - Relationship of vertical loading acting on pile and its settlement. For the first problem a vertical bar in Winkler's space exposedto horizontal impact was firstly observed and then the bar in theelastic half-space in order to obtain the distribution ofpotential energy for the bar and the soil. The mentioned energiesbalance the kinetic energy of the ship during the ship impactwith the on-shore structure. The algorithms have been developed for the computations ofon-shore structures in the stratified soil. The load testsplanned to be made on the constructed structures have not beenperformed due to financial reasons although one structure ( UmagMarina ) has been computed on the basis of the developed theory. At the second problem a functional connection between verticalload and pile settlement has been condidered. The investigationsare carried out in the framework of a dissertation and the authorhas performed over hundred load tests on the piles in the field.The problem of the settlement evaluation is being reduced to theproblem of the distribution of load transmission to the soilthrough the pile toe and pile skin taking into account the soilstrength and its deformation properties.

Keywords: Piles, horizontal load, vertical load, settlement, deformation, potential energy, kinetic energy of a ship.

Research goals: The main scope of these investigations is to determine displacement and deformation of piles subjected to various kinds of load. At horizontal loads caused by the impact of a ship when put to shore and when exposed to the wind blows, the dispacements and deformations of the on-shore structure take place. Depending on the magnitude of these displacements , the impact can be rigid or elastic. The gravity on-shore structures are practically immovable , while the on-shore structures on piles are rather deformable.The kinetic energy of a ship in the moment of the impact is being annuled by the potential energy of the elastic fenders, on-shore structure and the soil in which the piles occur. The re-distribution of this energy is the basis for an analysis of the on-shore structure. The test analyses have shown that, when taking into account the deformation of the on-shore structure and the foundation soil, the equivalent horizontal loads have been reduced for about 30%. It means that the assumption that the entire kinetic energy of the ship is being absorbed by the potential energy of the elastic fenders only, is not economical. At the piles loaded by vertical force, the main problem is to determine the load - settlement relationship. It is very difficult to define or quantify the allowable load. Namely, each force causes a certain displacement and this displacement is, in fact , the magnitude which can be taken over by the structure with adequate consequences. The both above mentioned problems are the question for discussion because there is almost no reliable procedure for the computation of a pile in any soil. The combination of theory and tests on the constructed structures provides a new experience and brings to the acceptable design procedures.

Other information about the project.
MZT Croatian language SVIBOR Alphabetic list Sorted on project code Sorted on institutions Search help
Ministry of
Science and
Sorted on
project code
Sorted on
Search Help

Last update: 02/24/94