Overload response of flatbar frames to ice loads

Daley, Claude; Daley, Katherine H.; Dolny, John; Quinton, Bruce

doi:10.1080/17445302.2016.1254520

Cited by 13 publications

(5 citation statements)

References 2 publications

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“…The only exception of which we are aware is a single measurement in 2005 derived from MIR observations with the Gemini South telescope (Skemer & Close 2011). Ten measurements by two amateur astronomers based on CCD frames obtained with small telescopes between 2008 and 2016 have been reported, their most recent publications being Anton (2014) and Daley (2016).…”

Section: Discussionmentioning

confidence: 99%

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry^∗

Bond

Schaefer

Gilliland

et al. 2017

ApJ

290

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Sirius, the seventh-nearest stellar system, is a visual binary containing the metallic-line A1V star SiriusA, the brightest star in the sky, orbited in a 50.13year period by SiriusB, the brightest and nearest white dwarf (WD). Using images obtained over nearly two decades with the Hubble Space Telescope (HST), along with photographic observations covering almost 20 years and nearly 2300 historical measurements dating back to the 19th century, we determine precise orbital elements for the visual binary. Combined with the parallax and the motion of the A component, these elements yield dynamical masses of M 2.063 0.023   and M 1.018 0.011   for SiriusA and B, respectively. Our precise HST astrometry rules out third bodies orbiting either star in the system, down to masses of ∼15-M 25 Jup . The location of SiriusB in the Hertzsprung-Russell diagram is in excellent agreement with theoretical cooling tracks for WDs of its dynamical mass, and implies a cooling age of ∼126Myr. The position of SiriusB on the mass-radius plane is also consistent with WD theory, assuming a carbon-oxygen core. Including the pre-WD evolutionary timescale of the assumed progenitor, the total age of SiriusB is about 228±10Myr. We calculated evolutionary tracks for stars with the dynamical mass of SiriusA, using two independent codes. We find it necessary to assume a slightly subsolar metallicity, of about Z 0.85  , to fit its location on the luminosity-radius plane. The age of SiriusA based on these models is about 237-247Myr, with uncertainties of±15Myr, consistent with that of the WD companion. We discuss astrophysical puzzles presented by the Sirius system, including the probability that the two stars must have interacted in the past, even though there is no direct evidence for this and the orbital eccentricity remains high.

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Section: Discussionmentioning

confidence: 99%

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry^∗

Bond

Schaefer

Gilliland

et al. 2017

ApJ

290

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“…If Eq. (5) is used, we obtain: (17) This means that * /1 p NN . Therefore, we assume 0 w  for stage 1, and the resistance is equal to 0 …”

Section: Stage 2: Tension Force In the Plate Flange And Webmentioning

confidence: 99%

“…Amdahl [16] proposed a model for the resistance of stiffened panels with fixed end conditions subjected to explosions with more refined yield functions. Daley et al [17] presented a model for overload response of simple flat bar stiffened frames subjected to ice loading, and the effect of bending and shear is discussed while the axial force is neglected. A series of full-scale experiments for the lateral indentation resistance of single stiffened frames and ship grillages were conducted and reported by Daley and Hermanski [18] and Kim [19], which provide valuable results for the investigation of the ultimate strength of stiffened frames.…”

Section: Introductionmentioning

confidence: 99%

Large inelastic deformation resistance of stiffened panels subjected to lateral loading

2018

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This paper presents a simplified formulation for the assessment of large deformation resistance of stiffened panels subjected to lateral loading. The method is based on rigid plastic material assumptions and the use of yield functions formulated in terms of stress resultants. The method considers the flexibility of the panel ends with respect to inward motion, while the rotational boundary conditions are free or clamped. Concentrated and distributed loads are considered, as is patch loading. The resistance-deformation curves predicted by the proposed method are compared with results from experiments and using LS-DYNA, and good agreement is obtained for panels that are not dominated by shear failure and tripping or local buckling of stiffeners at the early stage of deformation. The formulation provides a useful tool for quick estimates of panels subjected to abnormal or accidental static and transient lateral loads such as ship collisions, dropped objects, explosions, slamming, hydrostatic pressure and ice actions.

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“…, when V i = 0, the thickness of the plate under rigid-mass impact can be directly obtained. When V i ̸ = 0, the plating-thickness design formula under ice impact cannot be obtained by using only Equation (34). Therefore, the force balance equation and the ice damage absorption energy equation should be introduced on this basis, that is,…”

Section: Design Formula For Plating Thickness Under Ice-impact Loadmentioning

confidence: 99%

“…Daley [32,33] derived the plastic design formula of polar ship frame using work-energy principles based on the specification design requirements, finite-element analysis and analytical solutions of plastic-collapse mechanisms. In addition, based on the non-linear-finite-element analysis and IACS polar rules, Daley et al [34] developed the plastic buckling deformation analysis of flatbar frames to ice-like loads under overload conditions. Based on the rigid-plastic theory, Hong and Amdahl [35] proposed the "double-diamond" patch-loading mechanism, which was used to derive the plate-thickness formula under patch-loading that accounted for membrane effects under finite deformation.…”

Section: Introductionmentioning

confidence: 99%

A New Plastic Design Approach for the Vertical-Side-Plating Thickness of Ice-Strengthened Ships Suffering from Ice Floe Impacts

Mu,

Guo,

Cai

et al. 2024

JMSE

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Ice-strengthened ships inevitably suffer from ice floe impacts during navigation in icy regions. Under some extreme-ice-impact loadings, the ship structure will experience plastic deformations. The magnitude of plastic deformation is highly correlated with the ice floe-impact energy level. During most ice impacts, only the ship’s plate undergoes minor plastic deformation. Considering that the structure still has a high structural strength with a minor permanent deformation, developing a structural plastic design method for polar ships has become a hot research issue in current studies. Therefore, in this paper, based on the rigid-plastic theory and the ice-crushing-energy approach, an experimentally verified theoretical model for predicting plastic deformations of the vertical-side plate of polar ship subjected to ice floe impacts was established. According to the analytical solutions of the plastic deformation, the plastic design formula to determine the plating thickness of ice-strengthened ships subjected to ice floe impacts was further derived based on the plastic design criteria. In addition, the parameter analysis of ice strength described by the ice pressure–area relationship, allowable-permanent-set parameter, impact energy and ice shape were conducted, and plating-thickness design curves with different design parameters were given. The design of plating thickness is very sensitive to the determinations of the allowable-permanent set and ice pressure–area curves. The designed plating thickness decreased with the increase of the allowable-permanent set. Moreover, a comparative analysis of the designed plating thickness for ice floe impact and rigid-mass impact was also carried out. Under the same impact conditions, due to energy absorption caused by ice damage, the designed thickness of the plate for rigid-mass impact was much larger than that for the ice impact. It is necessary to consider the impact-induced ice damage and energy dissipation in a structural design, instead of using rigid impact loads for conservative design. The research in this paper can provide some useful references for the structural design of ice-strengthened ships subject to ice floe impacts.

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Overload response of flatbar frames to ice loads

Cited by 13 publications

References 2 publications

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry^∗

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry^∗

Large inelastic deformation resistance of stiffened panels subjected to lateral loading

A New Plastic Design Approach for the Vertical-Side-Plating Thickness of Ice-Strengthened Ships Suffering from Ice Floe Impacts

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Overload response of flatbar frames to ice loads

Cited by 13 publications

References 2 publications

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry∗

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry∗

Large inelastic deformation resistance of stiffened panels subjected to lateral loading

A New Plastic Design Approach for the Vertical-Side-Plating Thickness of Ice-Strengthened Ships Suffering from Ice Floe Impacts

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The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry^∗

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry^∗