Experimental Study on High-Performance Buckling-Restrained Braces with Perforated Core Plates

2018 ◽  
Vol 19 (01) ◽  
pp. 1940004 ◽  
Author(s):  
Liang-Jiu Jia ◽  
Yang Dong ◽  
Hanbin Ge ◽  
Kana Kondo ◽  
Ping Xiang
Keyword(s):  
Experimental Study ◽  
Shear Deformation ◽  
High Performance ◽  
Numerical Study ◽  
Slenderness Ratio ◽  
Compressive Deformation ◽  
Plane Shear ◽  
Buckling Restrained Braces ◽  
Out Of Plane ◽  
Global Buckling

The compressive deformation is mainly contributed by axial compressive deformation and high-order in-plane and out-of-plane global buckling deformation for conventional buckling-restrained braces (BRBs). A novel type of all-steel BRBs with perforated core plates, termed as perforated BRBs (PBRBs), are proposed in this study, where shear deformation can occur in addition to the aforementioned deformations in a conventional BRB under compression. Experimental study was carried out using five specimens with different configurations of holes under cyclic loading. Stable hysteretic properties, high ductility, and energy dissipation capacity were obtained for the PBRBs. The effects of two parameters, i.e. the slenderness ratio of the chord and hole spacing factor defined as the ratio of the hole length to the hole spacing, on seismic performance of the specimens were investigated. The compressive deformation mechanisms of the PBRBs were further investigated through a numerical study. The compressive deformation was found to be composed of axial compressive deformation, flexural deformation owing to in-plane and out-of-plane global buckling, and in-plane shear deformation of the latticed core plate.

scholarly journals Experimental measurements and numerical modelling of the mechanical behaviour of a glass plain weave composite reinforcement

2019 ◽  
Vol 39 (1-2) ◽  
pp. 45-59 ◽  
Author(s):  
Mehdi Ghazimoradi ◽  
Valter Carvelli ◽  
Naim Naouar ◽  
Philippe Boisse
Keyword(s):  
Shear Deformation ◽  
Mechanical Behaviour ◽  
Numerical Study ◽  
Plane Shear ◽  
Plain Weave ◽  
Out Of Plane ◽  
Bias Extension Test ◽  
Bias Extension ◽  
Meso Scale ◽  
Composite Reinforcement

The study deals with the mechanical behaviour of a glass plain weave composite reinforcement. The experimental activities were focused mainly on uniaxial and biaxial extension tests. Besides, in-plane shear deformation was measured by bias extension test, and for the sake of completeness out-of-plane bending behaviour. In the numerical study, a hyperelastic constitutive model for the yarn material was adopted and validated for the meso scale prediction of the mechanical behaviour of the glass plain weave reinforcement. The model was validated for biaxial tensile and in-plane shear deformation.

scholarly journals Experimental Study and High-Efficiency Simulation of In-Plane Behavior of Composite Frame Slab

2021 ◽  
Author(s):  
Wen-Hao Pan ◽  
Mu-Xuan Tao ◽  
Chuan-Hao Zhao ◽  
Ran Ding ◽  
Li-Yan Xu
Keyword(s):  
Experimental Study ◽  
Failure Mode ◽  
High Efficiency ◽  
Numerical Study ◽  
Element Model ◽  
Experimental Results ◽  
Loading Test ◽  
Composite Frame ◽  
Out Of Plane ◽  
Load Displacement

Abstract Experimental and numerical studies were conducted to investigate the in-plane behavior of the steel–concrete composite frame slab under cyclic loads. In the experimental study, an in-plane loading test of a typical composite frame slab was designed by constraining its out-of-plane deformations. The test observations, the load–displacement relationship, and the shear and flexural deformation components were discussed to investigate the in-plane load resistant behavior and the failure mechanism of the slab. The experimental results demonstrated an evident shear cracking concentration behavior and a pinching hysteretic curve associated with a typical shear-tension failure mode of the composite frame slab. In the numerical study, a high-efficiency modeling scheme based on the multiple vertical line element model (MVLEM) and the fiber beam–column element was developed for the test specimen. Comparisons with the experimental results showed that the developed model predicted the overall load–displacement relationship, the relationships associated with the shear and flexural deformation components, and the failure mode with a reasonable level of accuracy.

Characterization of piercing damage in CFRP cross-ply laminates after punch shear machining via impact loading

2021 ◽  
pp. 002199832110316
Author(s):  
Shinya Matsuda ◽  
Kohei Mabe ◽  
Keiji Ogi ◽  
Shigeki Yashiro ◽  
Yoshifumi Kakudo
Keyword(s):  
Shear Deformation ◽  
Composite Structures ◽  
Polymer Matrix Composites ◽  
Shear Loading ◽  
Matrix Composites ◽  
Plane Shear ◽  
Reinforced Plastic ◽  
Out Of Plane ◽  
Machining Operations

In industrial processes, piercing and trimming are essential because composite structures are usually manufactured in a near-net shape to reduce machining operations. Punching and shear cutting using out-of-plane shear loading are expected to increase productivity. Nevertheless, little is known about the effects of such operations on polymer-matrix composites. This study presents on the characterization of piercing damage in typical carbon fiber reinforced plastic (CFRP) cross-ply laminates [0°2/90°2]s after punching using quasi-static (QS) and drop-weight impact (DWI) loadings. During QS punching, the upper and lower ply interfaces delaminate due to the high shear stress to cut fibers and gradual shear deformation in the middle ply; however, during DWI punching at a low impact velocity, delamination of the lower ply interface can be reduced due to the localization of shear deformation, as compared to that in QS punching. Finally, the damage accumulation process during DWI punching is discussed.

scholarly journals Influence of Embedded Gap and Overlap Fiber Placement Defects on Interlaminar Properties of High Performance Composites

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5332
Author(s):  
Denis Cartié ◽  
Marine Lan ◽  
Peter Davies ◽  
Christophe Baley
Keyword(s):  
High Performance ◽  
Crack Arrest ◽  
Shear Loading ◽  
Plane Shear ◽  
Manufacturing Defects ◽  
Fiber Placement ◽  
Out Of Plane ◽  
Beam Shear ◽  
Automated Fiber Placement ◽  
Interlaminar Shear

Automated fiber placement (AFP), once limited to aerospace, is gaining acceptance and offers great potential for marine structures. This paper describes the influence of manufacturing defects, gaps, and overlaps, on the out-of-plane properties of carbon/epoxy composites manufactured by AFP. Apparent interlaminar shear strength measured by short beam shear tests was not affected by the presence of defects. However, the defects do affect delamination propagation. Under Mode I (tension) loading a small crack arrest effect is noted, resulting in higher apparent fracture energies, particularly for specimens manufactured using a caul plate. Under Mode II (in-plane shear) loading there is a more significant effect with increased fracture resistance, as stable propagation for specimens with small gaps changes to arrest with unstable propagation for larger gaps.

scholarly journals Evaluating Timoshenko Method for Analyzing CLT under Out-of-Plane Loading

Buildings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 184
Author(s):  
MD Tanvir Rahman ◽  
Mahmud Ashraf ◽  
Kazem Ghabraie ◽  
Mahbube Subhani
Keyword(s):  
Shear Modulus ◽  
Shear Deformation ◽  
Numerical Study ◽  
Wood Products ◽  
Tangential Plane ◽  
Rolling Shear ◽  
Laminated Veneer Lumber ◽  
Engineered Wood ◽  
Out Of Plane ◽  
Cross Layers

Cross-laminated timber (CLT) is an engineered wood product made up of layers of structurally graded timber, where subsequent layers are oriented orthogonally to each other. In CLT, the layers oriented in transverse direction, generally termed as cross-layer, are subjected to shear in radial–tangential plane, which is commonly known as rolling shear. As the shear modulus of cross-layers is significantly lower than that in other planes, CLT exhibits higher shear deformation under out-of-plane loading in contrast to other engineered wood products such as laminated veneer lumber (LVL) and glue laminated timber (GLT). Several analytical methods such as Timoshenko, modified gamma and shear analogy methods were proposed to account for this excessive shear deformation in CLT. This paper focuses on the effectiveness of Timoshenko method in hybrid CLT, in which hardwood cross-layers are used due to their higher rolling shear modulus. A comprehensive numerical study was conducted and obtained results were carefully analyzed for a range of hybrid combinations. It was observed that Timoshenko method could not accurately predict the shear response of CLTs with hardwood cross layers. Comprehensive parametric analysis was conducted to generate reliable numerical results, which were subsequently used to propose modified design equations for hybrid CLTs.

scholarly journals Out-of-plane shear deformation of a neo-Hookean fiber composite

2006 ◽  
Vol 354 (1-2) ◽  
pp. 156-160 ◽  
Author(s):  
G. deBotton ◽  
I. Hariton
Keyword(s):  
Shear Deformation ◽  
Fiber Composite ◽  
Plane Shear ◽  
Out Of Plane

scholarly journals Equivalent stiffness prediction and global buckling analysis using refined analytical model of composite laminated box beam

2019 ◽  
Vol 26 (1) ◽  
pp. 465-481 ◽  
Author(s):  
Xiujie Zhu ◽  
Chao Xiong ◽  
Junhui Yin ◽  
Dejun Yin ◽  
Huiyong Deng
Keyword(s):  
Critical Load ◽  
Shear Deformation ◽  
Analytical Model ◽  
Transverse Shear ◽  
Slenderness Ratio ◽  
Buckling Analysis ◽  
Equivalent Stiffness ◽  
Stiffness Coefficients ◽  
Box Beam ◽  
Global Buckling

Abstract The analytical model applicable to calculate the equivalent stiffnesses of composite box beam has been refined. The calculation of equivalent stiffness coefficients of composite laminated box beam is simplified and the connection between shear-deformable beam theory and classical laminate theory is established. The equivalent stiffness analytic formulas expressed by beam cross-section geometry and laminate stiffness coefficients are obtained. These analytical formulas are suitable for composite laminated box beam with circumferential uniform stiffness, and accounts for bending- transverse shear and torsiontensile coupling effect. The correctness and precision of refined analytical model is verified by test and finite element method, respectively. The influences of the lay-ups on the elastic coupling of composite structures and their causes are studied. The variation of the equivalent stiffnesses of the laminated box beams with different lay-ups is predicted. The global buckling analysis of composite laminated box beam considering the transverse shear deformation is carried out. The formula of the global buckling critical load is obtained combining with the theoretical formulas of equivalent stiffnesses. The influences of the lay-ups, shear deformation and slenderness ratio on the global buckling critical load are studied.

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