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Damian Beben - One of the best experts on this subject based on the ideXlab platform.
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static load tests of a road bridge with a flexible structure made from super cor type Steel corrugated plates
Journal of Bridge Engineering, 2005Co-Authors: Z Manko, Damian BebenAbstract: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 Giman River in Giman, Sweden on the Bracke-Holm road. The bridge has an effective span of 12.315 m and a clear height of 3.555 m . The span’s Steel Shell is founded on two reinforced concrete continuous footings. The average measured displacements and 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 performance of such Steel Shells and their interaction with the surrounding backfill. Since such Steel–soil designs are used more and more often for small and medium-sized bridges on road and railway lines in Poland and in the world, the concl...
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tests during three stages of construction of a road bridge with a flexible load carrying structure made of super cor type Steel corrugated plates interacting with soil
Journal of Bridge Engineering, 2005Co-Authors: Z Manko, Damian BebenAbstract:The way in which a new road bridge made of Steel corrugated plates Super Cor type was tested during the three stages of its construction is described and the test results are presented. Backfill in construction Stage I and two ballasting vehicles in Stages II and III constituted the loads. The box bridge spans the Bystrzyca Dusznicka River in Polanica Zdroj, Poland. The span’s effective length is 12.27 m and its vertical inside diameter is 3.85 m . The Steel span is founded on two reinforced concrete strip foundations. The average values of the displacements and strains (normal stresses) measured in selected points and on selected elements of the Steel Shell structure were much smaller than the ones computed for the same load. The conclusions drawn from this research can be helpful in determining the interaction between the Steel Shell and the backfill. Since this type of Steel–soil structure is increasingly used in Poland and in the world, the conclusions can be generalized to a whole class of similar br...
Werner Schneider - One of the best experts on this subject based on the ideXlab platform.
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NUMERICAL BUCKLING STRENGTH VERIFICATION OF CYLINDRICAL Steel Shell STRUCTURES SUBJECT TO COMBINED LOADING
International Journal of Structural Stability and Dynamics, 2007Co-Authors: Werner Schneider, Marco GettelAbstract:The inevitable deviations from the nominal data of the resistance parameters have to be included in a numerical calculation of the load-bearing capacity of Shells, because these structures are very imperfection-sensitive. The assumed imperfections are fundamental for the numerical buckling strength verification, because they have to cover the influence of all accidental imperfections of the structure in a consistent manner. Consistent equivalent geometric imperfections have been developed during the last years for the basic buckling cases of the circular cylindrical Steel Shell. The situation at Shells subject to combined loading is more difficult, because not so much experimental data is available. Fundamental problems and previous proposals for assuming equivalent imperfections at combined loading are discussed in the contribution. In particular, it is a moot point whether the equivalent geometric imperfections have to be chosen without regard to the load case, because imperfections of real Shells are caused by manufacturing and not by loading. Reasons are given for, why this is not applicable at equivalent imperfections of a numerical simulation. The conception of quasi-collapse-affine imperfections, which has already been proved at the basic buckling cases, can also be applied to Shells under combined loading.
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Collapse analysis of thin walled cylindrical Steel Shells subjected to constant shear stress
Computers & Structures, 2004Co-Authors: Werner Schneider, Yuri RibakovAbstract:Two principal possibilities for analyzing the structural response of quasi-statically loaded Steel Shell structures to different actions are available: the commonly used static path tracing and the dynamic analysis with slowly changing loads, i.e. quasi-static loading. However, the failure process of thin-walled Shells can often not be traced into the deep post-buckling area with static methods. The current research is focused on a thin-walled circular cylindrical Steel Shell collapse analysis under constant shear loading. It is shown that it is possible to overcome the difficulties and inconsistencies of the static analysis by using quasi-static analysis. This method allows to distinguish local and global instability points and to determine too the experimentally observed post-buckling strength.
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Equivalent Geometric Imperfections for Steel Shell Structures Subject to Combined Loading
III European Conference on Computational Mechanics, 1Co-Authors: Werner Schneider, Marco GettelAbstract:The inevitable deviations from the nominal data of the resistance parameters have to be included in a numerical calculation of the load-bearing capacity of Shells, because these structures are very imperfection-sensitive. In addition to simpler methods, the new European code for the resistance verification of Steel Shell structures EN 1993-1-6:2005 allows a geometrically and materially nonlinear analysis with imperfections included. The assumed imperfections are fundamental for this most sophisticated numerical buckling strength verification, because they have to cover the influence of all accidental imperfections of the structure in a consistent manner. According to the Eurocode, the influence of all various deviations should be included by only geometric equivalent imperfections. In spite of the intensive research efforts in the last decades, many problems are still residual, which have to be solved in order to apply the mentioned most realistic basic principle of the Eurocode to Shell buckling cases, which are not yet sufficiently investigated. Equivalent geometric imperfections are called consistent, if nonlinear numerical analyses including these imperfections result in the experimentally based buckling resistance. Consistent equivalent geometric imperfections have been developed during the last years for the basic buckling cases of the circular cylindrical Steel Shell ([1], [2]).
Yuri Ribakov - One of the best experts on this subject based on the ideXlab platform.
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Collapse analysis of thin walled cylindrical Steel Shells subjected to constant shear stress
Computers & Structures, 2004Co-Authors: Werner Schneider, Yuri RibakovAbstract:Two principal possibilities for analyzing the structural response of quasi-statically loaded Steel Shell structures to different actions are available: the commonly used static path tracing and the dynamic analysis with slowly changing loads, i.e. quasi-static loading. However, the failure process of thin-walled Shells can often not be traced into the deep post-buckling area with static methods. The current research is focused on a thin-walled circular cylindrical Steel Shell collapse analysis under constant shear loading. It is shown that it is possible to overcome the difficulties and inconsistencies of the static analysis by using quasi-static analysis. This method allows to distinguish local and global instability points and to determine too the experimentally observed post-buckling strength.
Brian G Thomas - One of the best experts on this subject based on the ideXlab platform.
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modeling transient slag layer phenomena in the Shell mold gap in continuous casting of Steel
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2003Co-Authors: Ya Meng, Brian G ThomasAbstract:Mold-slag friction and fracture may cause heat-transfer variations in continuous casting, which leads to Steel Shell temperature and stress variations, resulting in surface cracks. Analytical transient models of liquid slag flow and solid slag stress have been coupled with a finite-difference model of heat transfer in the mold, gap, and Steel Shell to predict transient shear stress, friction, slip, and fracture of the slag layers. The models are validated by comparing with numerical models and plant measurements of mold friction. Using reported slag-fracture strength and time-temperature-transformation (TTT) diagrams, the models are applied to study the effect of casting speed and mold-powder viscosity properties on slag-layer behavior between the oscillating mold wall and the solidifying Steel Shell. The study finds that liquid-slag lubrication would produce negligible stresses. A lower mold-slag consumption rate leads to high solid friction and results in solid-slag-layer fracture and movement below a critical value. Crystalline slag tends to fracture near the meniscus and glassy slag tends to fracture near the mold exit. A medium casting speed may be the safest to avoid slag fracture, due to its having the lowest critical lubrication consumption rate. The high measured friction force in operating casters could be due to three sources: an intermittent moving solid slag layer, excessive mold taper, or mold misalignment.
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Modeling transient slag-layer phenomena in the Shell/mold gap in continuous casting of Steel
Metallurgical and Materials Transactions B, 2003Co-Authors: Ya Meng, Brian G ThomasAbstract:Mold-slag friction and fracture may cause heat-transfer variations in continuous casting, which leads to Steel Shell temperature and stress variations, resulting in surface cracks. Analytical transient models of liquid slag flow and solid slag stress have been coupled with a finite-difference model of heat transfer in the mold, gap, and Steel Shell to predict transient shear stress, friction, slip, and fracture of the slag layers. The models are validated by comparing with numerical models and plant measurements of mold friction. Using reported slag-fracture strength and time-temperature-transformation (TTT) diagrams, the models are applied to study the effect of casting speed and mold-powder viscosity properties on slag-layer behavior between the oscillating mold wall and the solidifying Steel Shell. The study finds that liquid-slag lubrication would produce negligible stresses. A lower mold-slag consumption rate leads to high solid friction and results in solid-slag-layer fracture and movement below a critical value. Crystalline slag tends to fracture near the meniscus and glassy slag tends to fracture near the mold exit. A medium casting speed may be the safest to avoid slag fracture, due to its having the lowest critical lubrication consumption rate. The high measured friction force in operating casters could be due to three sources: an intermittent moving solid slag layer, excessive mold taper, or mold misalignment.
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Coupled thermo-mechanical model of solidifying Steel Shell applied to depression defects in continuous-cast slabs
1995Co-Authors: Brian G Thomas, Avijit Moitra, Hong ZhuAbstract:A coupled finite-element model has been developed to simulate the thermal-mechanical behavior of a transverse slice through the solidifying Steel Shell as it moves down through the mold and upper support rolls in the spray chamber of a continuous slab-casting machine. The heat transfer model incorporates the effect on solidification of superheat delivered by turbulent flow in the liquid pool. The stress model evaluates the highly non-linear elastic-visco-plastic constitutive equations using an efficient time iteration algorithm which alternates between local and global levels. The stress model assumes a stress state of generalized plane strain and employs an efficient contact algorithm to achieve reasonable deformation of the Shell, under the influence of internal ferrostatic pressure. The two models, which are coupled together through the size of the interfacial gap between the Shell and the mold, have been validated with analytical solutions and plant measurements. Separate mathematical models have been applied to simulate fluid flow and heat transfer within the melting powder layer on the top surface of the liquid pool and thermal distortion of the mold. Together, these models are used to illustrate a multi-stage mechanism for the formation of longitudinal off-corner depression defects or gutters during continuous casting of Steelmore » slabs. Specifically, the depressions form during bulging below the mold, as a result of inadequate heat flow in the mold in the off-corner wide face region. The results suggest ways to avoid the problem that are consistent with industrial experience.« less
Z Manko - One of the best experts on this subject based on the ideXlab platform.
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static load tests of a road bridge with a flexible structure made from super cor type Steel corrugated plates
Journal of Bridge Engineering, 2005Co-Authors: Z Manko, Damian BebenAbstract: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 Giman River in Giman, Sweden on the Bracke-Holm road. The bridge has an effective span of 12.315 m and a clear height of 3.555 m . The span’s Steel Shell is founded on two reinforced concrete continuous footings. The average measured displacements and 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 performance of such Steel Shells and their interaction with the surrounding backfill. Since such Steel–soil designs are used more and more often for small and medium-sized bridges on road and railway lines in Poland and in the world, the concl...
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tests during three stages of construction of a road bridge with a flexible load carrying structure made of super cor type Steel corrugated plates interacting with soil
Journal of Bridge Engineering, 2005Co-Authors: Z Manko, Damian BebenAbstract:The way in which a new road bridge made of Steel corrugated plates Super Cor type was tested during the three stages of its construction is described and the test results are presented. Backfill in construction Stage I and two ballasting vehicles in Stages II and III constituted the loads. The box bridge spans the Bystrzyca Dusznicka River in Polanica Zdroj, Poland. The span’s effective length is 12.27 m and its vertical inside diameter is 3.85 m . The Steel span is founded on two reinforced concrete strip foundations. The average values of the displacements and strains (normal stresses) measured in selected points and on selected elements of the Steel Shell structure were much smaller than the ones computed for the same load. The conclusions drawn from this research can be helpful in determining the interaction between the Steel Shell and the backfill. Since this type of Steel–soil structure is increasingly used in Poland and in the world, the conclusions can be generalized to a whole class of similar br...
