Sag Rods as Lateral Supports for Girts and Purlins

Polyzois, Dimos

doi:10.1061/(asce)0733-9445(1987)113:7(1521)

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…Basaglia and Dinar [47][48][49] also conducted some tests on the behavior of purlins and applied the GBT theory into the research of purlin-sheeting systems. After Polyzois [50] had studied the effect of the sag rods on the buckling limit of the purlins, Zhang and Tong [51][52][53][54][55] proposed a theory to analysis the stress and lateral buckling problem of purlins with the top flange horizontally restrained and with one anti-sag bar at middle span sections. Hancock and Pham [56] extended the Direct Strength Method into the purlin design.…”

Section: Purlin-sheeting System (Roof/wall Systems)mentioning

confidence: 99%

Damage Analysis and Evaluation of Light Steel Structures Exposed to Wind Hazards

Yang

Bai

2017

Applied Sciences

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Compared to hot-rolled steel structures, cold-formed steel structures are susceptible to extreme winds because of the light weight of the building and its components. Many modern cold-formed steel structures have sustained significant structural damage ranging from loss of cladding to complete collapse in recent cyclones. This article first provides some real damage cases for light steel structures induced by the high winds. After that, the paper reviews research on the damage analysis and evaluation of light steel structures caused by strong winds, which include connection failure, fatigue failure, purlin buckling, and primary frame component instability problems. Moreover, this review will mention some applications of structure damage assessment methods in this area, such as vulnerability analysis and performance-based theory, etc.

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Section: Purlin-sheeting System (Roof/wall Systems)mentioning

confidence: 99%

Damage Analysis and Evaluation of Light Steel Structures Exposed to Wind Hazards

Yang

Bai

2017

Applied Sciences

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“…2a, 2b and 2c. The expression of total potential of the purlin can be given by   (1) in which L is the purlin span; u is the displacement of shear center of cross-section in the x direction and is the twist of cross-section around z axis; E and G are respectively Young's and shear modulus of material; y I and I  are respectively the second moment of area about y axis and the warping inertia moment of cross-section; J is the free torsion constant of the cross-section; 1 T , 2 T are the tensile forces in sagrods connected to the purlin respectively;…”

Section: Twisting About Line Of Parallel Purlins Inter Braced By Offsmentioning

confidence: 99%

“…In current design practice the sagrods are assumed to be able to provide full bracing to purlins, i.e., in the moment analysis, the purlins are assumed to be a continuous beam with intermediate rigid support at the cross-section of sagrods. But Dimos Polyzois [1] have found that the sagrods are unable to prohibit the lateral movement of the purlin at the sagrod cross-section. The thickness of the purlin web is usually 1.5mm to 2.5mm, and are easy to be locally deformed under the action of sagrod tension [2 -6], see Fig.3.…”

Section: Introductionmentioning

confidence: 99%

Twisting about constrained line of parallel purlins inter braced by sagrods under wind suctions

Sun

Tong

Zhang

2016

Thin-Walled Structures

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Simply supported purlins inter braced by one line of sagrods in a parallel purlin system under wind suction are analyzed. The sagrods are assumed to be zigzag placed with 30 ~ 50mm offset in adjacent spacing. The effect of this offset and the local deformation on the effectiveness of sagrod is analyzed. A purlin is divided into 3 segments by offsetted sagrods, and the general solution is found for such a purlin under wind suction. The solution is then extended to a parallel purlin system to determine the deformations of all purlins in the system. Examples are given to reveal the bracing effect of sagrods to purlins away from the sagrod anchor spacing. It is found that the sagrod bracing effect drops quickly as the number of spacings to the sagrod anchor spacing increases. The deformation of the last purlin in the 10 purlin system is close to a purlin without sagrod if the purlin thickness is 1.5mm. FE analysis is carried out to verify the analytic results and excellent agreement is found. Simplified equations are proposed to find the tensile forces in sagrods, purlin deformations and internal forces easily. Practical meaning of this study may be formulated as follows: (1) the distance of two diagonally braced spacing, as shown in Fig. 1, should be smaller if the purlin thickness is small; (2) it is welcome to take measures to reduce the local deformation of purlin web at the sagrod points.

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Buckling of parallel purlins inter-braced by sag-rods

Tong

Yajun

2017

Journal of Constructional Steel Research

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Sag Rods as Lateral Supports for Girts and Purlins

Cited by 8 publications

References 2 publications

Damage Analysis and Evaluation of Light Steel Structures Exposed to Wind Hazards

Damage Analysis and Evaluation of Light Steel Structures Exposed to Wind Hazards

Twisting about constrained line of parallel purlins inter braced by sagrods under wind suctions

Buckling of parallel purlins inter-braced by sag-rods

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