Combined‐Load Stability Criterion for Wood Beam‐columns

Zahn, John J.

doi:10.1061/(asce)0733-9445(1988)114:11(2612)

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…Zahn [19] proposed a design criterion for wood members under combined axial and bending loads. Zahn [20] conducted an elastic buckling analysis in beam-columns to develop a general interaction equation for use in timber design. Koka [21] developed finite element solution to predict instability and material strength failures of lumber elements under combined bending and axial loading.…”

Section: Literature Reviewmentioning

confidence: 99%

Simplified expressions for elastic lateral torsional buckling of wooden beams

Sahraei

Pezeshky

Mohareb

et al. 2018

Engineering Structures

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A beam finite element formulation is developed for the elastic lateral torsional buckling analysis of wood beams with rectangular cross-sections. The formulation accounts for moment gradient, load height, and pre-buckling deformation effects. The validity of the finite element and underlying variational principle is established through comparisons with critical moments obtained by 3D FEA simulations and experimental results. The validated variational expression is then adopted to develop approximate analytical expressions that separately characterize the effects of moment gradient, partial twist restraints that may exist at beam-ends, load height, and pre-buckling deformation effects.Dimensionless coefficients were formulated to characterize each effect for simple beams and cantilevers under common loading scenarios. The derived coefficients are then consolidated into a unified framework that accounts for all effects combined to predict the elastic lateral torsional buckling capacity of wooden beams.

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Section: Literature Reviewmentioning

confidence: 99%

Simplified expressions for elastic lateral torsional buckling of wooden beams

Sahraei

Pezeshky

Mohareb

et al. 2018

Engineering Structures

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“…The lateral torsional buckling of wood beams has been experimentally investigated by Hooley and Madsen (1964), Hindman et al (2005a), Hindman et al (2005b), Burow et al (2006), and Xiao (2014) with emphasis on comparing experimental results with design codes. Buchanan (1986), Zahn (1986), Koka (1987), Zahn (1988), Bell and Eggen (2001), Steiger and Fontana (2005), Song and Lam (2006), Song and Lam (2009), and Song and Lam (2010) investigated the buckling behavior of beam-columns. Zahn (1965), Zahn (1973), and Zahn (1984) developed analytical solutions for the lateral torsional buckling of wood beam-deck systems.…”

Section: Overview Of the Stability Research On Wood Membersmentioning

confidence: 99%

Nonsway Model for Lateral Torsional Buckling of Wooden Beams under Wind Uplift

Mohareb

Doudak

2016

J. Eng. Mech.

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Simply-supported wooden beams nailed to deck boards subjected to wind uplift forces are subjected to compressive stresses at their bottom fibers. Because the restraining action provided by decking is at the top fibers, it is unclear to what extent such restraints are effective in controlling lateral torsional buckling as a possible mode of failure under wind uplift. Present design standards do not have provisions for such cases. Thus, the present study aims to quantify the effect of restraints provided by the deck boards on the lateral torsional buckling capacity of twin-beam-deck systems under wind uplift.Towards this goal, a series of analytical and numerical models were formulated. All models capture the continuous rigid lateral restraint and partial twisting restraint provided by the deck boards. The effects of load type and load position were investigated. The bending stiffness of deck boards was observed to have a significant influence on the lateral torsional buckling capacity of twin-beam-deck systems.

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“…Esta versión toma en cuenta de una manera más realista y consistente la variabilidad inherente en la resistencia y rigidez de los productos de madera, así como la naturaleza dependiente del tiempo de la resistencia de los mismos bajo condiciones de carga estocástica. Otra ventaja de este reglamento es que utiliza enfoques modernos para las ecuaciones de columnas, vigas y conexiones (Zahn, 1988;McLain y Carroll, 1990). Este borrador fue revisado posteriormente y se tenia la esperanza en el año 1993 se adoptara un reglamento de consenso (es decir nacional) (ASCE,1993), lo cual si bien no sucedió e stá muy próximo a convertirse en realidad.…”

Section: Reglamentos De Estados Limite Para Maderaunclassified

“…contraparte, el grupo de investigadores mexicanos encargados de la elaboración de un reglamento similar se llevo los mismos dos años en concluir un reglamento final, iniciando de cero, puesto que la versión anterior estaba basado en conceptos de esfuerzos permisibles, 1988). Las formulas de cálculo adoptadas en el reglamento mexicano son muy similares a las del reglamento para diseño de puentes carreteros de Ontario, Canadá (OMTC, 1983).…”

Section: Enunclassified

Diseño probabilístico de estructuras de madera en Norteamérica

Sotelo

2016

MYB

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The subject of reliability-based design for North America is reviewed. The objective of probabilistic design using First order Second moment methods is described. These Methods are based on the concept of safety index, from which the probability of failure, P f , can be estimated. Calibration procedures for the design equations are discussed. Load factors specified by different codes for usual loading combinations are presented, as well as the resistance-reducing factors. One argument in favor of probabilistic design is that it provides a quantitative measurement of the safety of structures. However, quite often, the differences between observed and predicted failure rates are substantial. Some of the reasons for these discrepancies are presented. Results from the literature indicate that the serviceability requirement of the current codes could be insufficient in terms of reliably predicting the functional behavior of modern structures. KEY WORDS.Limit states design, reliability index, probability of failure, load factors, resistance factors, load duration factor.

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Combined‐Load Stability Criterion for Wood Beam‐columns

Cited by 10 publications

References 6 publications

Simplified expressions for elastic lateral torsional buckling of wooden beams

Simplified expressions for elastic lateral torsional buckling of wooden beams

Nonsway Model for Lateral Torsional Buckling of Wooden Beams under Wind Uplift

Diseño probabilístico de estructuras de madera en Norteamérica

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