scholarly journals EXPERIMENTAL STUDY ON BUCKLING BEHAVIOR OF SINGLE LAYER TWO-WAY GRID CYLINDRICAL SHELL ROOF COMPOSED OF SMALL ROUND TIMBER WITH TENSION MEMBERS IN OUT-OF-PLANE

2013 ◽  
Vol 78 (686) ◽  
pp. 781-789 ◽  
Author(s):  
Zhonghao ZHANG ◽  
Masumi FUJIMOTO ◽  
Atsuo TAKINO ◽  
Katsuhiko IMAI
Keyword(s):  
Experimental Study ◽  
Cylindrical Shell ◽  
Single Layer ◽  
Buckling Behavior ◽  
Out Of Plane ◽  
Tension Members ◽  
Round Timber

scholarly journals Mechanical Behavior of Single-Layer Two-Way Grid Cylindrical Latticed Shell with Out-of-Plane Tension Members

2014 ◽  
Vol 8 (1) ◽  
pp. 311-319 ◽  
Author(s):  
Zhang Zhonghao ◽  
Ma Huihuan ◽  
Fujimoto Masumi ◽  
Fu Qiang
Keyword(s):  
Load Distribution ◽  
Single Layer ◽  
Distribution Patterns ◽  
Stability Behavior ◽  
Initial Imperfections ◽  
Tension Member ◽  
Grid Shell ◽  
Out Of Plane ◽  
New Type ◽  
Tension Members

Single layer two-way grid shell with in-plane and out-of-plane tension members is a new type of single-layer latticed shell roof. This study treats the effects of tension member installation on the buckling load and strength of a single layer two-way grid cylindrical shell roof by the numerical method. The tension members are installed to stiffen the rigidity of a single layer two-way grid shell roof and improve its stability behavior. Tension member installation and placement pattern is focused as both diagonal members of two-way grids and out-of-plane stiffened members in a cylindrical surface. The diagonal member and the out-of-plane member are used to increase the in-plane and the out-of-plane rigidity of a single layer two-way grid shell, respectively. The tension member placement pattern, the load distribution patterns, the initial imperfections and the initial axial force are considered for the numerical calculation parameters. It is confirmed by the numerical analysis that the tension members in out-of-plane and diagonals caused the increase in the buckling and strength of two-way grid shell.

Experimental study of the buckling strength of compression members connected to coplanar tension members

1989 ◽  
Vol 16 (3) ◽  
pp. 249-257 ◽  
Author(s):  
André Picard ◽  
Denis Beaulieu
Keyword(s):  
Experimental Study ◽  
Plane Deformation ◽  
Effective Length ◽  
Small Scale ◽  
Transverse Stiffness ◽  
Effective Length Factor ◽  
Tension Member ◽  
Compression Members ◽  
Out Of Plane ◽  
Tension Members

In structural systems using cross braces, the compression members are restrained against out-of-plane buckling by the tension members. It was shown in a theoretical study that the transverse stiffness provided by a tension member depends on the tension force in the member and on the flexural stiffness against out-of-plane deformation of the tension member. Equations were derived to determine the effective length factor of the compression member, taking into account the transverse stiffness of the tension member.This paper presents the results of a small-scale experimental study, which shows that the proposed equations slightly underestimate the transverse stiffness and overestimate the effective length factor. These equations are therefore conservative, but they indicate that an effective length factor much smaller than 1.0 can be used. Key words: stability, elastic buckling, elastic supports, cross braces.

scholarly journals Vibration analysis of a sandwich cylindrical shell in hygrothermal environment

2021 ◽  
Vol 10 (1) ◽  
pp. 414-430
Author(s):  
Chunwei Zhang ◽  
Qiao Jin ◽  
Yansheng Song ◽  
Jingli Wang ◽  
Li Sun ◽  
...  
Keyword(s):  
Cylindrical Shell ◽  
Natural Frequency ◽  
Equations Of Motion ◽  
Single Layer ◽  
Functionally Graded ◽  
Sandwich Shell ◽  
Continuous Change ◽  
Multilayered Structures ◽  
Cylindrical Sandwich Shell ◽  
Vibrational Behavior

Abstract The sandwich structures are three- or multilayered structures such that their mechanical properties are better than each single layer. In the current research, a three-layered cylindrical shell including a functionally graded porous core and two reinforced nanocomposite face sheets resting on the Pasternak foundation is used as model to provide a comprehensive understanding of vibrational behavior of such structures. The core is made of limestone, while the epoxy is utilized as the top and bottom layers’ matrix phase and also it is reinforced by the graphene nanoplatelets (GNPs). The pattern of the GNPs dispersion and the pores distribution play a crucial role at the continuous change of the layers’ properties. The sinusoidal shear deformation shells theory and the Hamilton’s principle are employed to derive the equations of motion for the mentioned cylindrical sandwich shell. Ultimately, the impacts of the model’s geometry, foundation moduli, mode number, and deviatory radius on the vibrational behavior are investigated and discussed. It is revealed that the natural frequency and rotation angle of the sandwich shell are directly related. Moreover, mid-radius to thickness ratio enhancement results in the natural frequency reduction. The results of this study can be helpful for the future investigations in such a broad context. Furthermore, for the pipe factories current study can be effective at their designing procedure.

Thermal Conductivity Reduction in Few-Layer Graphene

2011 ◽  
Author(s):  
Dhruv Singh ◽  
Jayathi Y. Murthy ◽  
Timothy S. Fisher
Keyword(s):  
Thermal Conductivity ◽  
Weak Coupling ◽  
Phonon Scattering ◽  
Single Layer ◽  
Acoustic Mode ◽  
Single Layer Graphene ◽  
Boltzmann Transport ◽  
Layer Graphene ◽  
Out Of Plane ◽  
Few Layer Graphene

Using the linearized Boltzmann transport equation and perturbation theory, we analyze the reduction in the intrinsic thermal conductivity of few-layer graphene sheets accounting for all possible three-phonon scattering events. Even with weak coupling between layers, a significant reduction in the thermal conductivity of the out-of-plane acoustic modes is apparent. The main effect of this weak coupling is to open many new three-phonon scattering channels that are otherwise absent in graphene. The highly restrictive selection rule that leads to a high thermal conductivity of ZA phonons in single-layer graphene is only weakly broken with the addition of multiple layers, and ZA phonons still dominate thermal conductivity. We also find that the decrease in thermal conductivity is mainly caused by decreased contributions of the higher-order overtones of the fundamental out-of-plane acoustic mode. Moreover, the extent of reduction is largest when going from single to bilayer graphene and saturates for four layers. The results compare remarkably well over the entire temperature range with measurements of of graphene and graphite.

scholarly journals Cyclic tensile-compressive tests on thin concrete boundary elements with a single layer of reinforcement prone to out-of-plane instability

2017 ◽  
Vol 16 (2) ◽  
pp. 859-887 ◽  
Author(s):  
Angelica Rosso ◽  
Lisandro A. Jiménez-Roa ◽  
João Pacheco de Almeida ◽  
Aydee Patricia Guerrero Zuniga ◽  
Carlos A. Blandón ◽  
...  
Keyword(s):  
Single Layer ◽  
Boundary Elements ◽  
Out Of Plane ◽  
Compressive Tests

Single-layer folding in marble and limestone: An experimental study

1984 ◽  
Vol 108 (1-2) ◽  
pp. 155-172 ◽  
Author(s):  
V.K. Gairola ◽  
H. Kern
Keyword(s):  
Experimental Study ◽  
Single Layer
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