Analysis of a Sudden Failure of RC Roof Slabs in a Steel Mill

2006 ◽  
Vol 302-303 ◽  
pp. 591-594
Author(s):  
Ting Yu Hao ◽  
Yun-Ling Hui
Keyword(s):  
Steel Mill ◽  
Steel Rolling ◽  
Sudden Failure ◽  
Steel Bar ◽  
Concrete Degradation ◽  
Service Environments

Two Reinforcement Concrete (RC) roof slabs, with a size of 1.5 m×6 m, suddenly dropped from the roof after 32 years service in a steel rolling workshop of a steel mill. By in-situ inspection and lab investigation, it was found that the failure of the roof slabs were due to the severe corrosion of the prestressed steel bar, which was induced by concrete degradation connected closely with the service environments of the slabs.

Partially-exposed cast-in-situ concrete degradation induced by internal-external sulfate and magnesium multiple coupled attack

2021 ◽  
Vol 294 ◽  
pp. 123560
Author(s):  
Gaowen Zhao ◽  
Mengzhen Guo ◽  
Jifei Cui ◽  
Jingpei Li ◽  
Longfei Xu
Keyword(s):  
Concrete Degradation

Roll-Force and Torque Coefficients for Hot-Strip Steel Mill

1960 ◽  
Vol 82 (3) ◽  
pp. 683-688
Author(s):  
B. N. Garudachar ◽  
H. A. Peterson
Keyword(s):  
Rolling Mill ◽  
Roll Force ◽  
Steel Mill ◽  
Strip Rolling ◽  
Steel Rolling ◽  
Strip Steel ◽  
Roll Torque ◽  
Hot Strip ◽  
Flat Strip ◽  
Cold Mill

This paper provides results of an analytical and computer investigation to determine the numerical coefficients involved in the roll-force and roll-torque equations pertaining to a single stand in a multistand, tandem, steel rolling mill. To the authors’ knowledge, such information has not appeared in the literature to date. The coefficients for a typical hot mill are compared with those obtained for a typical cold mill. The principles of gage control are discussed. The theories on flat-strip rolling are reviewed briefly.

Analysis of performance of in-situ carbon steel bar reinforced Al-alloy foams

2016 ◽  
Vol 152 ◽  
pp. 432-443 ◽  
Author(s):  
Isabel Duarte ◽  
Lovre Krstulović-Opara ◽  
Matej Vesenjak
Keyword(s):  
Carbon Steel ◽  
Al Alloy ◽  
Steel Bar ◽  
Analysis Of Performance

Effect of boron on the mechanism of strain transfer across grain boundaries in Ni3Al

1987 ◽  
Vol 2 (4) ◽  
pp. 436-440 ◽  
Author(s):  
G. M. Bond ◽  
I. M. Robertson ◽  
H. K. Birnbaum
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Dislocation Motion ◽  
Strain Transfer ◽  
Undoped Material ◽  
Sudden Failure ◽  
Transmission Electron ◽  
Large Numbers ◽  
Dislocation Sources

The effect of boron on the mechanism of strain transfer across grain boundaries in Ni3Al has been investigated by dynamic recording of events occurring during in-situ straining in the transmission electron microscope. Boundaries in both doped and undoped material can act as effective barriers to dislocation motion, large numbers of dislocations being incorporated into the boundary without any plastic strain occurring in the adjacent grain. In the undoped material, the grain-boundary strain is relieved by the sudden failure of the grain boundary. In the doped material the strain is relieved by the sudden generation and emission of large numbers of dislocations from the grain boundary. This effect may be understood by boron either increasing the grain-boundary cohesion or reducing the stress required to operate grain-boundary dislocation sources, rather than easing the passage of slip dislocations through the grain boundary.

scholarly journals Fortification of Damaged Asphalt Pavements with Cement Concrete Slabs Reinforced with Next-Gen Bars – Part I: Laboratory Study

2018 ◽  
Vol 64 (3) ◽  
pp. 67-80
Author(s):  
Piotr Radziszewski ◽  
Wioletta Jackiewicz-Rek ◽  
Michał Sarnowski ◽  
Marek Urbański
Keyword(s):  
Laboratory Tests ◽  
Concrete Slab ◽  
Asphalt Pavements ◽  
Concrete Slabs ◽  
Cement Concrete ◽  
Rigid Pavement ◽  
Steel Bar ◽  
In Situ Conditions ◽  
Rigid Layer

AbstractOver the course of operation, asphalt road pavements are subjected to damage from car traffic loads and environmental factors. One of the possible methods of strengthening damaged asphalt pavements may be the application of an additional rigid layer in the form of a cement concrete slab with continuous reinforcement.This paper presents a material-technological and structural solution for composite pavement where a cement concrete slab with continuous HFRP bar reinforcement is used for strengthening. Based on laboratory tests, the serviceability of composite bar reinforcement of rigid pavement slabs was shown. A design for strengthening asphalt pavement with a concrete slab with steel bar and corresponding HFRP bar reinforcement was developed. The composition of a pavement cement concrete mix was designed, and experimental sections were formed. Based on laboratory tests of samples collected from the surfaces of experimental sections and the diagnostic tests carried out in “in situ” conditions, the authors will try, in the nearest future (Part II: In situ observations and tests), to confirm the effectiveness of strengthening asphalt pavements with cement concrete slabs with HFRP components.

Corrosion Prognosis: Maritime Structural Performances in Service Environments

2017 ◽  
Author(s):  
Yikun Wang ◽  
Jon Downes ◽  
Julian A. Wharton ◽  
R. Ajit Shenoi
Keyword(s):  
Structural Analysis ◽  
Structural Response ◽  
Response Prediction ◽  
Degradation Process ◽  
Material Degradation ◽  
Full Field ◽  
Multi Scale ◽  
Mechanical Factors ◽  
Service Environments

For marine platforms, assessing the structural resilience in a corroded condition is vital for both design and maintenance practices. With the development of computational and experimental methods for structural analysis, the accuracy of the structural response prediction relies on a better understanding of the material degradation process. However, a realistic estimate of corrosion is inherently a complex undertaking. Corrosion of even a single form can often involve multiple stages, each of which has different steps across several geometric scales; corrosion systems are often multi-layered and involve geometric complexities; the mechanical factors (stress/strain distributions) could affect the corrosion initiation and kinetics. These complexities have resulted in scientific barriers to the advancement of a corrosion prognosis that forecasts damage accumulation, as well as a computational realization of the corrosion-structural analysis. This paper reviews the numerical and experimental work that the authors have done, including the development of nonlinear finite element models to assess the behavior of damaged steel ship structures, full-field experimental verifications, application of the mechano-electrochemical theory and in situ tensile-corrosion tests. It is intended that the outcome of this research will be the establishment of a systematic multi-scale multi-physics experimental and numerical protocol for predicting aged structural resilience.

Advanced Techniques for Rolling Mill Gearing

1973 ◽  
Vol 95 (4) ◽  
pp. 1101-1107
Author(s):  
G. Henriot
Keyword(s):  
Rolling Mill ◽  
Steel Mill ◽  
Advanced Technique ◽  
Steel Rolling ◽  
Rolling Mills ◽  
Conventional Steel ◽  
Manufacturing Operations ◽  
Marine Propulsion

This paper explains some of the problems arising from the increased speed and horsepower being applied to modern steel rolling mills. To deal with these problems techniques have been adopted which have already been used in cement mill and marine propulsion gearing. The use of harder materials, including case carburized steels is the primary recommendation. A modern steel mill operating in Holland is used as a basis for comparing the “advanced technique” gearing with conventional steel mill gearing. The paper also includes a brief description of some of the manufacturing operations which are unique to this type of gearing.

scholarly journals Deformation Behavior of a Double Soaked Medium Manganese Steel with Varied Martensite Strength

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 761 ◽  
Author(s):  
Alexandra Glover ◽  
Paul J. Gibbs ◽  
Cheng Liu ◽  
Donald W. Brown ◽  
Bjørn Clausen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Work Hardening ◽  
Manganese Steel ◽  
Strain Partitioning ◽  
Medium Manganese Steel ◽  
The Matrix ◽  
Work Hardening Rate ◽  
Service Environments ◽  
In Situ Neutron Diffraction

The effects of athermal martensite on yielding behavior and strain partitioning during deformation is explored using in situ neutron diffraction for a 0.14C–7.14Mn medium manganese steel. Utilizing a novel heat treatment, termed double soaking, samples with similar microstructural composition and varied athermal martensite strength and microstructural characteristics, which composed the bulk of the matrix phase, were characterized. It was found that the addition of either as-quenched or tempered athermal martensite led to an improvement in mechanical properties as compared to a ferrite plus austenite medium manganese steel, although the yielding and work hardening behavior were highly dependent upon the martensite characteristics. Specifically, athermal martensite was found to promote continuous yielding and improve the work hardening rate during deformation. The results of this study are particularly relevant when considering the effect of post-processing thermal heat treatments, such as tempering or elevated temperature service environments, on the mechanical properties of medium manganese steels containing athermal martensite.

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