Residual Strength of Dented Tubulars: Impact Energy Correlation

1985 ◽  
Vol 107 (4) ◽  
pp. 485-492 ◽  
Author(s):  
D. M. Richards ◽  
A. Andronicou
Keyword(s):  
Impact Energy ◽  
Residual Strength ◽  
Lateral Load ◽  
Offshore Structures ◽  
Large Displacement ◽  
Energy Correlation ◽  
Tubular Columns ◽  
Plastic Analysis

A procedure for the analysis of the damage of tubular members by denting and bending under lateral load is described. This leads to a relationship between impact energy and consequent damage. A large displacement, elasto-plastic analysis of dented tubular columns with imperfect straightness is introduced, which allows the effect of impact energy on member residual strength to be determined. Examples of damage reported from offshore structures are used to illustrate the analysis.

Charpy impact energy correlation with fracture toughness for low alloy structural steel welds

2021 ◽  
Vol 113 ◽  
pp. 102934
Author(s):  
Vitor S. Barbosa ◽  
Lucas A.C. de Godois ◽  
Kleber E. Bianchi ◽  
Claudio Ruggieri
Keyword(s):  
Fracture Toughness ◽  
Structural Steel ◽  
Impact Energy ◽  
Charpy Impact ◽  
Charpy Impact Energy ◽  
Energy Correlation ◽  
Steel Welds

Tubular Conical Columns for Offshore Structures

1993 ◽  
Vol 115 (4) ◽  
pp. 219-222
Author(s):  
S. J. Cox
Keyword(s):  
Hydrostatic Pressure ◽  
Offshore Structures ◽  
Buckling Load ◽  
Tubular Columns ◽  
Euler Buckling ◽  
Effect Of Hydrostatic Pressure ◽  
Volume Preserving

We examine submerged nonlinear tubular columns with slenderness ratios between 40 and 160 and ratios of diameter to thickness between 20 and 50. We demonstrate that the column’s Euler buckling load can be increased nearly 30 percent by a volume preserving taper of only a few degrees. We determine the effect of hydrostatic pressure and self-weight on such conical columns and offer some preliminary remarks on the role played by model imperfections.

Fracture Toughness Properties of SA540 Steels for Nuclear Bolting Applications

1977 ◽  
Vol 99 (3) ◽  
pp. 419-426
Author(s):  
R. R. Seeley ◽  
W. A. Van Der Sluys ◽  
A. L. Lowe
Keyword(s):  
Fracture Toughness ◽  
Impact Energy ◽  
Nuclear Reactor ◽  
Charpy Impact ◽  
Nuclear Regulatory Commission ◽  
Charpy Impact Energy ◽  
Energy Correlation ◽  
Impact Properties ◽  
Minimum Requirements ◽  
Regulatory Commission

Large bolts manufactured from SA540 Grades B23 and B24 are used on nuclear reactor vessels and require certain minimum mechanical properties. A minimum fracture toughness of 125 ksi in. (137 MPa m) at maximum operating stresses is required by the Nuclear Regulatory Commission for these bolts. This minimum toughness property was determined by a stress analysis of a bolt. Minimum required Charpy impact properties were calculated by a fracture toughness-Charpy impact energy correlation and the minimum calculated fracture toughness. The fracture toughness, yield strength and Charpy V notch impact properties were determined for five commercial heats of SA540 steels. Correlations between the fracture toughness and Charpy impact properties of these materials were evaluated. The toughness-impact energy correlation used to set the minimum required Charpy impact properties was found to be unduly conservative, and a different correlation of these properties is suggested. The SA540 steels investigated exhibited fracture toughness properties in excess of the NRC minimum requirements.

Elastic-Plastic Analysis of the Interaction between Ice and Offshore Structures

2009 ◽  
Vol 417-418 ◽  
pp. 897-900
Author(s):  
Tao Yu ◽  
Wei Yang ◽  
Li Qiang Tang
Keyword(s):  
Mechanical Properties ◽  
Constitutive Equation ◽  
Stress Field ◽  
Offshore Structures ◽  
Offshore Platforms ◽  
Pressure Sensitivity ◽  
Strength Ratio ◽  
Structure Interaction ◽  
Plastic Analysis ◽  
Distribution Of Stress

In this paper, the mechanical properties of ice, which are affected by the existence of cavities and the different tensile-compression strength ratio, are analyzed in micromechanics view. Then the constitutive equation is established, and the distribution of stress field caused by the ice-structure interaction is constructed with the constitutive equation. Finally, the ultimate bearing capacity of ice is also discussed with different values of pressure sensitivity parameter and the tension-compression ratio. Thus, this paper provides the theoretical reference for offshore platforms design.

Overview of Research Progress for Concrete-Filled Steel Tubular Columns after Exposure to Fire

2014 ◽  
Vol 638-640 ◽  
pp. 197-201
Author(s):  
Yan Chong Pan ◽  
Guo Hui Wang ◽  
Kai Xiang
Keyword(s):  
Mechanical Properties ◽  
Residual Strength ◽  
Fire Safety ◽  
Axial Load ◽  
Research Progress ◽  
Building Structures ◽  
Fire Exposure ◽  
Tubular Columns ◽  
Cfst Columns ◽  
Exposure Process

Fire safety is one of the most important performances index to evaluate building structures. The property of building members after exposure to fire involved with the safety of buildings after fire, and it will be necessary to estimate the post-fire residual strength of the structure in order to decide the appropriate strategy for repair. This paper summarizes the research progress of concrete-filled steel tubular (CFST) columns. Basic mechanical properties of conventional CFST columns after exposure to fire, CFST columns after the whole fire exposure process under sustained axial load, and CFST columns with special forms after exposure to fire are discussed.

Residual Strength of Concrete Filled RHS Stub Columns after Exposure to High Temperatures

2002 ◽  
Vol 5 (2) ◽  
pp. 123-134 ◽  
Author(s):  
Lin-Hai Han ◽  
Hua Yang ◽  
Shu-Liang Cheng
Keyword(s):  
High Temperatures ◽  
Residual Strength ◽  
Axial Strain ◽  
Steel Tube ◽  
Hollow Section ◽  
Tubular Columns ◽  
Mechanics Model ◽  
Influence Of Temperature On ◽  
Strain Relationship ◽  
Stub Column

Tests are reported on twenty-six concrete filled steel tube of rectangular section after being exposed to high temperatures, to investigate the influence of temperature on section capacity and load-deformation behavior. The main parameter varied is temperature, from 20°C to 900°C. A mechanics model is described in this paper for the behaviour of concrete-filled RHS (Rectangular Hollow Section) columns after exposed to high temperatures, and is a development of the analysis (Han et al, 2001a) used when only normal temperatures apply. The predicted load versus axial strain relationship is in good agreement with stub column test results. Simplified models are derived for the section capacities and the modulus of elasticity of the composite sections. It was found in general, that the higher the exposure temperature, the higher the loss of section capacities and elastic modulus which resulted. The tests have shown the importance of the influence of high temperatures on the performance of concrete filled steel tubes. The work in this paper provides a basis for further theoretical study on the residual strength of concrete filled steel tubular columns.

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