On the Effective Length of Compression Members in Double-Layer Grids

Madi, Usama Rustom; El-Tayem, Adel A.

doi:10.1177/026635119100600103

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…Madi & Al-tayem 23 recommend buckling coefficient values for compressed bars of space trusses according to the detail at the ends of these elements:…”

Section: Theoretical and Experimental Results Of Tests On Compressedmentioning

confidence: 99%

Theoretical Analysis of the Structural Performance of Space Trusses Commonly Used in Brazil

Souza

Gonçalves

Maiola

et al. 2003

International Journal of Space Structures

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Space trusses built in Brazil use basically two connection systems. In system 1, the node is formed by the superimposition of tubular section bars with stamped ends connected by a single bolt. The system 2 is a node consisting of welded steel plates to which bars with stamped ends or bars with end plates are connected. The authors have been engaged in theoretical and experimental studies to characterize the behaviour of these systems, including modifications to improve structural performance and establishing analytical models consistent with experimental behaviour. The theoretical analyses by finite element method have been performed utilizing the ANSYS and LUSAS software programs, using three distinct approaches: (i) analyses of isolated bars with section variations at the ends, (ii) analyses of the global behaviour of the structure considering the eccentricities on the connection, section variations in the bars and nonlinear behaviour, and (iii) numerical analyses of the local behaviour of the connection and its influence on global response and collapse modes.

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“…Madi & Al-tayem 23 recommend buckling coefficient values for compressed bars of space trusses according to the detail at the ends of these elements:…”

Section: Theoretical and Experimental Results Of Tests On Compressedmentioning

confidence: 99%

Theoretical Analysis of the Structural Performance of Space Trusses Commonly Used in Brazil

Souza

Gonçalves

Maiola

et al. 2003

International Journal of Space Structures

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“…If the stress just before buckling is less than the proportional limit stress of the material, the member woks in the elastic regime when buckling and the buckling is classified as elastic buckling. For elastic buckling, the classical Euler theory can be used to compute the critical buckling load ( ) and the critical buckling stress ( ) as follows [28] (10) (11) where E denotes the modulus of elasticity; A and r are the area and radius of gyration of the cross section of the member; L is the length of the member; K is the effective length factor of the member, which depends upon the type of connection between members and the geometric properties of the member at its end [1,29]. In this case study, K is taken as 0.95 according to the design guidance [1].…”

Section: Classify the Type Of Bucklingmentioning

confidence: 99%

Detection of member overall buckling in civil space grid structures based on deviation in normal strain along the member

Yan

Chen

Feng

et al. 2017

Engineering Structures

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A number of structural collapses are initiated from losing stability locally. The monitoring and detection of instability is rarely studied in both research communities of structural health monitoring and structural stability. In order to capture member buckling at an early stage to prevent a local instability from propagating into an overall structural failure, in this study, an approach to detect one type of instability (member overall buckling) is proposed for civil large-scale space grid structures. The foundation of this approach lies in: once a member buckles, a large bending stress due to buckling is developed and dominates the total normal stress of the member. Since the bending stress varies along a member, the total normal stress varies along the member, so does the total normal strain on the surface of the member. Therefore, by identifying the deviation in normal strain at two different cross sections of a member, overall buckling of the member can be detected. This study will justify that strain gauges can pick up all the bending stress induced by buckling as long as they are deployed before buckling. Numerical simulations have been conducted on large-scale space grid structures with different types of connections between members and loading situations. The obtained results have shown that once a member buckles, the strains measured at two different cross sections on the member deviate from each other significantly, verifying the efficacy of the proposed approach.

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“…Out-of-plane buckling of chord members experience greater resistance as web members are more effective at providing restraint to out-of-plane deflection. As proposed by Madi and EI-Tayem (1991), effective length values for chord members are: where both ends have a high degree of restraint k = 0.76 for in-plane buckling and k = 0.67 for out-of-plane buckl~g; where one end has a high degree of restraint and the other end is pinned, effective length factors of k = 0.81 for in-plane buckling, and k = 0.72 for out-of-plane buckling are specified. Murtha-Smith and Bean (1989) discuss the factors which affect the effective buckling lengths of members and give typical values for SOS grids as a function of these parameters.…”

Section: Member Effective Lengthsmentioning

confidence: 99%