Évaluation des méthodes réglementaires de détermination des déplacements sismiques par analyse dynamique non linéaire

Branci, Taïeb; Tiliouine, Boualem

doi:10.1139/l04-026

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…The intrinsic viscosity [η] of polyethylene (PE) in decahydronaphathrene was measured with an Ubbelohde viscometer at 135 °C. The viscosity‐average molecular weight ( M η ) was calculated as follows18: [η] = 6.67 × 10 −4 M η 0.67 . The gel permeation chromatography (GPC) method, performed on a Waters 150 ALC/GPC system in a 1,2,4‐trichlorobenzene solution at 135 °C, was used to determine the weight‐average molecular weights ( M w 's) and the molecular weight distributions [polydispersity indices (PDIs)] of the polymers.…”

Section: Methodsmentioning

confidence: 99%

Novel cyclohexyl‐substituted salicylaldiminato–nickel(II) complex as a catalyst for ethylene homopolymerization and copolymerization

Sun

Shan

et al. 2004

J. Polym. Sci. A Polym. Chem.

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The cyclohexyl-substituted salicylaldiminato-Ni(II) complex [O-(3-C 6 H 11 )(5-CH 3 )C 6 H 2 CHAN-2,6-C 6 H 3 i Pr 2 ]Ni(PPh 3 )(Ph) (4) has been synthesized and characterized with 1 H NMR and X-ray structure analysis. In the presence of phosphine scavengers such as bis(1,5-cyclooctadiene)nickel(0) [Ni(COD) 2 ], triisobutylaluminum (TIBA), and triethylaluminum (TEA), 4 is an active catalyst for ethylene polymerization and copolymerization with the polar monomers tert-butyl-10-undecenoate, methyl-10-undecenoate, and 4-penten-1-ol under mild conditions. The polymerization parameters affecting the catalytic activity and viscosity-average molecular weight of polyethylene, such as the temperature, time, ethylene pressure, and catalyst concentration, are discussed. A polymerization activity of 3.62 ϫ 10 5 g of PE (mol of Ni h) Ϫ1 and a weight-average molecular weight of polyethylene of 5.73 ϫ 10 4 g . mol Ϫ1 have been found for 10 mol of 4 and a Ni(COD) 2 /4 ratio of 3 in a 30-mL toluene solution at 45°C and 12 ϫ 10 5 Pa of ethylene for 20 min. The polydispersity index of the resulting polyethylene is about 2.04. After the addition of tetrahydrofuran and Et 2 O to the reaction system, 4 exhibits still high activity for ethylene polymerization. Methyl-10-undecenoate (0.65 mol %), 0.74 mol % tert-butyl-10-undecenoate, and 0.98 mol % 4-penten-1-ol have been incorporated into the polymer.

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Section: Methodsmentioning

confidence: 99%

Novel cyclohexyl‐substituted salicylaldiminato–nickel(II) complex as a catalyst for ethylene homopolymerization and copolymerization

Sun

Shan

et al. 2004

J. Polym. Sci. A Polym. Chem.

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“…The frames are subjected to two horizontal load patterns, a uniform pattern UD, whereby lateral forces are proportional to the total mass at each floor level, and an inverted triangular pattern TD, in which seismic forces are proportional to the product of floor mass and storey height [32,33,34]. The horizontal loads are distributed along the frame height with the intensity increased incrementally until a mechanism is reached.…”

Section: Modeling Approach For Inelastic Analysismentioning

confidence: 99%

Overstrength and ductility factors of XBF structures with pinned and fixed supports

Yahmi

Branci

Bouchaïr

et al. 2023

Studia Geotechnica Et Mechanica

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In today's time, most seismic design codes are based on a linear elastic force-based approach that includes the nonlinear response (ductility and overstrength) of the structure through a reduction factor (named behavior factor q in Eurocode 8 [EC8]). However, the use of a prescribed q-factor that is constant for a given structural system may fail in providing structures with the same risk level. This paper focuses on the estimation of actual values of q-factor for X-braced steel frames (XBFs) designed according to the European codes and comparing these values to those suggested in EC8. For this purpose, a nonlinear pushover analysis has been performed. The effects of specific parameters, such as the stories number, the brace slenderness ratio, the local response of structural members, and the support type, are evaluated. The results show that the most important parameter that affects the q-factor is the brace slenderness ratio, while the support type has less effect on this factor. Furthermore, a local strength criterion has been proposed to implicitly ensure that the suggested value of the q-factor is conservative.

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Une relation simplifiée pour le calcul de la période fondamentale de certains types de bâtiments irréguliers

Branci

Tiliouine

Mébarki³

2006

Revue Européenne de Génie Civil

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Évaluation des méthodes réglementaires de détermination des déplacements sismiques par analyse dynamique non linéaire

Cited by 3 publications

References 4 publications

Novel cyclohexyl‐substituted salicylaldiminato–nickel(II) complex as a catalyst for ethylene homopolymerization and copolymerization

Novel cyclohexyl‐substituted salicylaldiminato–nickel(II) complex as a catalyst for ethylene homopolymerization and copolymerization

Overstrength and ductility factors of XBF structures with pinned and fixed supports

Une relation simplifiée pour le calcul de la période fondamentale de certains types de bâtiments irréguliers

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