Out-of-plane buckling and design of X-bracing systems with discontinuous diagonals

Moon, Jiho; Yoon, Ki Yong; Han, Tong Seok; Lee, Hak Eun

doi:10.1016/j.jcsr.2007.07.008

Cited by 16 publications

(4 citation statements)

References 8 publications

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“…Davaran (2001) [8] concludes that by increasing the out-of-plane stiffness of middle connection via cutting one of the angles at the intersection of braces in double angle sections, the buckling strength of the braces can be improved. Moon et al (2007) [9] investigate the effects of middle connection type on the effective length factor of the concentrically braced frames. They propose a formulation that approximates the critical buckling load of concentrically braced frames using discontinuous diagonal members.…”

Section: Introductionmentioning

confidence: 99%

Analytical approach of buckling strength of yielding damped braced core (YDBC)

Sabouri‐Ghomi

Payandehjoo

Ghasemzadeh

2017

NMCE

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Previous research on bracing members show that the ductility of bracing members is compromised due to the buckling phenomena. Therefore, many researchers have tried to use special considerations to increase the fracture life of bracing members. Some of these recommendations such as increasing the slenderness ratio, using lower width to thickness ratio, increasing the out-of-plane stiffness of middle connection to increase the fracture life of the bracing members can be used in seismic upgrading of bracing members. In this paper, the buckling behavior of a special type of concentrically braced frame termed as yielding damped braced core is investigated for different percentage of central core. Empirical studies shows that separation of X-braces by central frame, influence the buckling behavior of the system and leads to occurrence of buckling in second mode shape in accordance with two half-sine wave. The theoretical studies shows that the buckling strength of the system increases in proportion to increase in central core rigidity. Using more flexible central core, results in increase the possibility of instability and vice versa. Hence, to enhance the buckling behavior of the system, it is strongly recommended to use a central core with proper rigidity .

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Section: Introductionmentioning

confidence: 99%

Analytical approach of buckling strength of yielding damped braced core (YDBC)

Sabouri‐Ghomi

Payandehjoo

Ghasemzadeh

2017

NMCE

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“…Davaran (2001) investigated Xbraced frames with discontinuous centre connections and concluded that using a rigid centre connection is a key element in increasing the load-carrying capacity of braced frames. Moon et al (2008) discussed discontinuous X-bracings and used column buckling curves to predict the inelastic lateral resistance of braced frames. Majid Zamani and Rassouli (2006) presented and discussed the results of full-scale cyclic lateral load tests on single-span Y-braced frames with different geometries and brace sections.…”

Section: Introductionmentioning

confidence: 99%

Out-of-plane buckling of Y-braced frames with rigid joints

Zamani

Vafai

Kazemi

2013

Proceedings of the Institution of Civil Engineers - Structures

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Because of the complicated buckling characteristics of Y-shaped bracings, calculation of their strength is beyond routine engineering procedures. A method based on slope-deflection equations incorporating stability functions has been used for computation of buckling eigenvalues and effective length factors. Lateral strength is computed based on the least buckling strength of bracing members. This study is limited to bracings with similar sections and fixed end connections resisting out-of-plane rotation. Lateral strengths predicted by the analytical method for two cases are compared with experimental results on full-scale specimens. It is shown that the proposed analytical method predicts the real strength with a good precision for practical purposes.

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“…However, Stoman's study did not provide any formula to quantify the lateral support to the compression diagonal by the tension diagonal. Moon et al (2008) proposed values for the effective length factor K for use in an elastic design of the compression diagonal and checked the validity of the proposed K factors with the AISC equation for the inelastic case. However, no direct mathematical relationship relating the inelastic ultimate strength of the compression diagonal with other system parameters is given.…”

Section: Introductionmentioning

confidence: 99%

Stability Design of Cross-Bracing Systems for Frames

Eric M. Lui and Xiaoran Zhang

2013

Eng J

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In this study, the inelastic load-carrying capacity of the compression diagonal of a typical cross-bracing system used in concentrically braced frames under gravity and wind loads is investigated, taking into consideration its interaction effect with the tension diagonal. Depending on the lateral stiffness of the tension diagonal, the compression diagonal can be fully or partially braced by the tension diagonal at their intersection point. An expression for the transition lateral stiffness, kst, that demarcates the fully and partially braced conditions is derived. When the compression diagonal is fully braced, its maximum load-carrying capacity is a function of its member slenderness, L/r, only. However, when the compression diagonal is partially braced, its load capacity is dependent upon both its member slenderness, L/r, and the lateral stiffness, ks, of the tension diagonal. Once the equations for the maximum load-carrying capacity of the compression diagonal are established, design guidelines are proposed and design examples are given to demonstrate how the proposed guidelines can be used for the design of cross-bracing systems in steel frames. The consideration of the lateral bracing effect will result in a more economical and logical design for such bracing systems.

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Out-of-plane buckling and design of X-bracing systems with discontinuous diagonals

Cited by 16 publications

References 8 publications

Analytical approach of buckling strength of yielding damped braced core (YDBC)

Analytical approach of buckling strength of yielding damped braced core (YDBC)

Out-of-plane buckling of Y-braced frames with rigid joints

Stability Design of Cross-Bracing Systems for Frames

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