ENGINEERING TRANSACTIONS
ROZPRAWY INŻYNIERSKIE
A QUARTERLY JOURNAL
- Z. Mańko, D. Bęben:
Behaviour of steel-soil bridge structure made of corrugated plates
under field load tests. Part I: Static research
- Z. Mańko, D. Bęben:
Behaviour of steel-soil bridge structure made of corrugated plates
under field load tests. Part II: Dynamic research
- J. Rasek, Z. Stokłosa:
Investigation of material properties by means of magnetic methods
- P. Kędziora:
A fuzzy-set approach to buckling analysis of composite structures
- Z. Mańko, D. Bęben:
Behaviour of steel-soil bridge structure made of corrugated plates
under field load tests. Part I: Static research
- The way in which a new road bridge made from Super Cor steel plates was tested is
described and the test results, for three static load schemes in which one ballasting vehicle
(a Scania truck) was used as the load, are presented. The tested bridge has a box structure
and it is located on the Gimån River in Gimån, Sweden on the Bråcke - Holm road.
The bridge has an effective span of 12.315 m and a clear height of 3.555 m. The steel
shell of the span is founded on two reinforced concrete continuous foundations. The average
measured displacements and unit strains (normal stresses) in selected points and elements of
the steel shell structure were found to be much smaller than the ones calculated for the same
load. The conclusions drawn from this research can be useful for assessing the behaviour of
such steel shells and their interaction with the surrounding backfill. Since such steel-soil
structures are used more and more often for small and medium-sized bridges on road and railway
lines in Poland and in the world, the conclusions from the static load tests can be generalized
to a whole class of similar bridge structures.
Contents
- Z. Mańko, D. Bęben:
Behaviour of steel-soil bridge structure made of corrugated plates
under field load tests. Part II: Dynamic research
- The paper presents the results and conclusions of dynamic load tests that were conducted
on a road bridge over river Gimån in Sweden (the first bridge of this type in Scandinavia)
made from Super Cor corrugated steel plates. Conclusions drawn from the tests can be mostly
helpful in the assessment of behaviour of this type of corrugated plate bridge with backfill. In
consideration of application of this type of structure in the case of small-to-medium more and more
frequent span of bridges, the conclusions from the research will be generalized to all types of
such solutions.
Contents
- J. Rasek, Z. Stokłosa:
Investigation of material properties by means of magnetic methods
- In the present paper, magnetic method of determination of ferrite content in austenite
steels, based on saturation polarisation and magnetic polarisation of ferrite near the
remanence point, have been presented for Fe-Cr-Ni-type alloys. Magnetic phase analysis,
taking into account the distribution of total magnetic losses on eddy current losses,
relaxation losses and hysteresis losses, have been discussed for low-carbon and low-alloy
steels. The formulas on tangent angle of eddy current, hysteresis and relaxation (additional)
losses have been presented. General formulas for magnetic permeability and coercive force have
also been presented in terms of internal magnetic and material parameters. These parameters
allowed to analyse the structural changes in magnetic materials. Examples of the influence of
chemical composition, structural defects and thermal annealing on the changes of saturation
polarisation, magnetic permeability, coercive force, magnetic hysteresis and relaxation losses
have been discussed for low-carbon steels and amorphous alloys.
Contents
- P. Kędziora:
A fuzzy-set approach to buckling analysis of composite structures
- A fuzzy-set approach conjugated with finite element analysis is used to investigate
the influence of the variability (random field) of geometric and material properties on
buckling loads understood as one of possible failure modes for composite structures.
The uncertainty (the scatter) of buckling loads is created by the prescribed variations
of thickness and in Young's and Kirchhoff's moduli. The α-cut and vertex methods are
utilized to study the sensitivity of buckling loads to fuzzy parameters variations. Numerical
results are presented for axially compressed angle ply-plates and shallow cylindrical panels.
Contents
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