Stability of Structures

Bažant, Zdeněk P.; Cedolin, Luigi

doi:10.1142/7828

Cited by 334 publications

(145 citation statements)

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“…Do granice proporcionalnosti modul elastičnosti E ima konstantnu vrednost i funkcija je samo vrste materijala. Sa dalјim rastom opterećenja, ovaj modul postaje i funkcija nivoa naprezanja Et = f(σ) i naziva se tangentni modul [4]. Za razliku od E koji zavisi od karakteristika materijala, Et je u funkciji i napona.…”

Section: Stability Of the Frames In Elasto-plasic Domainunclassified

Nonlinear stability analysis of the frame structures

Ćorić¹,

Brčić²

2016

Gra mat konstru

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Section: Stability Of the Frames In Elasto-plasic Domainunclassified

Nonlinear stability analysis of the frame structures

Ćorić¹,

Brčić²

2016

Gra mat konstru

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“…These simple assumptions result in a higher critical load for anchored CNTs because of the different column effective length factors (K F ¼ 1 for freestanding and K A ¼ 0.5 for sandwiched specimens). 36 In order to evaluate the effects of PDMS on the buckling modes, we performed scanning electron microscope (SEM) analyses on both freestanding and anchored CNTs while the samples were compressed at a fixed strain value of $0.4 using a controlled clamping mechanism. Figures 5(a) and 5(b) show the compression of freestanding and sandwiched CNTs, respectively.…”

Section: -mentioning

confidence: 99%

Nonlinear viscoelasticity of freestanding and polymer-anchored vertically aligned carbon nanotube foams

Lattanzi

Raney

Nardo

et al. 2012

Journal of Applied Physics

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Vertical arrays of carbon nanotubes (VACNTs) show unique mechanical behavior in compression, with a highly nonlinear response similar to that of open cell foams and the ability to recover large deformations. Here, we study the viscoelastic response of both freestanding VACNT arrays and sandwich structures composed of a VACNT array partially embedded between two layers of poly(dimethylsiloxane) (PDMS) and bucky paper. The VACNTs tested are ∼2 mm thick foams grown via an injection chemical vapor deposition method. Both freestanding and sandwich structures exhibit a time-dependent behavior under compression. A power-law function of time is used to describe the main features observed in creep and stress-relaxation tests. The power-law exponents show nonlinear viscoelastic behavior in which the rate of creep is dependent upon the stress level and the rate of stress relaxation is dependent upon the strain level. The results show a marginal effect of the thin PDMS/bucky paper layers on the viscoelastic responses. At high strain levels (ɛ = 0.8), the peak stress for the anchored CNTs reaches ∼45 MPa, whereas it is only ∼15 MPa for freestanding CNTs, suggesting a large effect of PDMS on the structural response of the sandwich structures

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“…The first one is the shear deformation effects of battened columns on the global buckling capacity. The calculation of the compressive strength of built-up columns, based on the approach proposed by Engesser (1891), was presented by Bleich (1952), Timoshenko and Gere (1961), Bazant and Cedolin (1991). The stiffeners (batten plates) were replaced by a piece of equivalent plate for simplicity.…”

Section: Introductionmentioning

confidence: 99%

Torsional-Flexural Buckling of Unevenly Battened Columns under Eccentrical Compressive Loading

Ren

Cheng

et al. 2016

J. Eng. Mech.

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Abstract:In this paper, an analytical model is developed to determine the torsional-flexural buckling load of a channel column braced by unevenly distributed batten plates. Solutions of the critical buckling loads were derived for three boundary cases using the energy method in which the rotating angle between the adjacent battens was presented in the form of a piecewise cubic Hermite interpolation (PCHI) for unequally spaced battens. The validity of the PCHI method was numerically verified by the classic analytical approach for evenly battened columns and a finite element analysis for unevenly battened ones, respectively. Parameter studies were then performed to examine the effects of loading eccentricities on the torsional-flexural buckling capacity of both evenly and unevenly battened columns. Design parameters taken into account were the ratios of pure torsional buckling load to pure flexural buckling load, the number and position of battens, and the ratio of the relative extent of the eccentricity. Numerical results were summarized into a series of relative curves indicating the combination of the buckling load and corresponding moments for various buckling ratios.2

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Stability of Structures

Cited by 334 publications

References 0 publications

Nonlinear stability analysis of the frame structures

Nonlinear stability analysis of the frame structures

Nonlinear viscoelasticity of freestanding and polymer-anchored vertically aligned carbon nanotube foams

Torsional-Flexural Buckling of Unevenly Battened Columns under Eccentrical Compressive Loading

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