STATICAL ANALYSIS OF ON-SHORE STRUCTURES FOUNDED ON PILES
Main researcher
: VERIĆ, FRANJO (74774) Assistants
MARIĆ, BOŽICA (145714)
MUHOVEC, IVAN (151325)
IVANDIĆ, KREŠO (900657)
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
Communication
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.