Research on Corner Structure Under Explosive Loading for War-Ship Cabin

2010 ◽  
Author(s):  
Xiangshao Kong ◽  
Shuangxi Xu ◽  
Weiguo Wu ◽  
Xiaobin Li ◽  
Yuanzhou Zheng
Keyword(s):  
Shock Wave ◽  
Nonlinear Dynamic ◽  
Failure Process ◽  
High Strength ◽  
Explosive Loading ◽  
Inclined Plate ◽  
Explosion Pressure ◽  
Conventional Structure ◽  
Dynamic Software ◽  
Plate Connection

For the warship cabin under explosive loading, the detail structure in cabin corner can easily be torn by the high-strength shock wave converging at the structure corner. In order to avoid that the crevasse occurs at the corner firstly, three strengthening structure forms were designed for the cabin corner: thickening connection, circular connection and inclined plate connection. Failure process of the joint in the two-cabin structure under the explosive loading was simulated by the nonlinear dynamic software DYTRAN. Comparing the response of the corner strengthening structure to that of the conventional structure, it was concluded that three strengthening structure forms changed failure mode of the cabin structure effectively and the crevasse initiated at the explosion pressure release hole on the transverse bulkhead, which reduced the tearing of the cabin corner. To seek more reasonable corner strengthening structure, the pressure and the stress on the bulkhead under the explosive loading of the three corner strengthening structures were compared. The results showed the inclined plate connection can prevent the shock wave from concentrating at the corner, decrease the stress on the longitudinal bulkhead, and resist the shock wave spreading into the inner cabins most effectively in the three strengthening forms.

New Bolted End-Plate Connection Design

2014 ◽  
Vol 1025-1026 ◽  
pp. 878-884
Author(s):  
Jong Wan Hu ◽  
Jun Hyuk Ahn
Keyword(s):  
Design Procedure ◽  
High Strength ◽  
Limit States ◽  
Moment Connections ◽  
End Plate ◽  
Plastic Strength ◽  
Plate Connections ◽  
Plate Connection ◽  
Connection Design

This paper is principally performed to survey end-plate connection are described in the next part based on ideal limit states. The determination of end-plate based on the full plastic strength of the steel beam in accordance with 2001 AISC-LRFD manual and AISC/ANSI 358-05 Specifications. The bolted connections considered herein were performed to include the end-plate component of moment connections. This study is intended to investigate economic design for end-plate connections. In addition, the proposed end-plate model is evaluated by comparing the required factored bolt strength. The end-plates using 8 high strength bolts with wider gages demonstrated this design. The equations belonging to the step-by-step design procedure are described based on complete proving of design. Finally, new design methodology is applied to end-plate connections suggested in this study.

Strength nature of two-dimensional woven nanofabrics under biaxial tension

2018 ◽  
Vol 28 (3) ◽  
pp. 367-379
Author(s):  
Yinfeng Li ◽  
Simanta Lahkar ◽  
Qingyuan Wei ◽  
Pizhong Qiao ◽  
Han Ye
Keyword(s):  
Lattice Structure ◽  
Biaxial Tension ◽  
Failure Process ◽  
High Strength ◽  
Two Dimensional ◽  
Strength Performance ◽  
Fabric Strength ◽  
Dynamics Simulations ◽  
Gap Spacing ◽  
Space Interval

Woven nanostructures have been acknowledged as a platform for solar cells, supercapacitors, and sensors, making them especially of interest in the fields of materials sciences, nanotechnology, and renewable energy. By employing molecular dynamics simulations, the mechanical properties of two-dimensional woven nanofabrics under biaxial tension are evaluated. Two-dimensional woven nanostructures composed of graphene and graphyne nanoribbons are examined. Dynamic failure process of both graphene woven nanofabric and graphyne woven nanofabric with the same woven unit cell initiates at the edge of interlaced ribbons accompanied by the formation of cracks near the crossover location of yarns. Further stress analysis reveals that such failure mode is attributed to the compression between two overlaced ribbons and consequently their deformation under biaxial tension, which is sensitive to the lattice structure of nanoribbon as well as the density of yarns in fabric. Systemic comparisons between nanofabrics with different yarn width and interval show that the strength of nanofabric can be effectively controlled by tuning the space interval between nanoribbons. For nanofabrics with fixed large gap spacing, the strength of fabric does not change with the ribbon width, while the strength of nanofabric with small gap spacing decreases anomalously with the increase in yarn density. Such fabric strength dependency on gap spacing is the result of the stress concentration caused by the interlace compression. The outcomes of simulation suggest that the compacted arrangement of yarns in carbon woven nanofabric structures should be avoided to achieve high strength performance.

The importance of shock wave profile in explosive loading experiments

1964 ◽  
Vol 12 (8) ◽  
pp. 956-957 ◽  
Author(s):  
A.S. Appleton ◽  
J.S. Waddington
Keyword(s):  
Shock Wave ◽  
Explosive Loading ◽  
Wave Profile

Nonlinear Dynamic Finite Analysis of BFRP-Strengthened Masonry Structure Based on ABAQUS

2014 ◽  
Vol 936 ◽  
pp. 1331-1335
Author(s):  
Zhen Lei ◽  
Yong Wang ◽  
Jun Tong Qu
Keyword(s):  
Nonlinear Dynamic ◽  
Structural Damage ◽  
Failure Process ◽  
Dynamical Analysis ◽  
Base Shear ◽  
Confined Masonry ◽  
Damage And Failure ◽  
Before And After ◽  
Concrete Damage ◽  
Strengthening Technique

The externally bonded FRP is an effective strengthening technique, which is mainly verified through laboratory tests. In this paper, numerical analysis models were established in ABAQUS respectively based on an experimental scaled three-story confined masonry structures before and after strengthened with BFRP. Then dynamical analysis considering material nonlinearity, geometric nonlinearity and contact nonlinearity was carried out on these two models. Here, representative volume element method was used to simplify the simulation of masonry. Besides, concrete damage plasticity model was adopted to simulate the structural damage and failure process. The reliability and accuracy of nonlinear dynamic finite analysis were validated by comparing the numerical simulation results and experimental results in terms of dynamic property, displacement and acceleration response and the maximum base shear.

Behaviour under Explosive Loading of Concrete Reinforced with Polymer Grids

1985 ◽  
Vol 64 ◽  
Author(s):  
B. Hobbs ◽  
A. J. Watson ◽  
P. N. Oldroyd
Keyword(s):  
High Strength ◽  
Explosive Loading ◽  
Concrete Slabs ◽  
Light Weight ◽  
Conventional Steel ◽  
Post Test ◽  
Plastic Explosive ◽  
New Form ◽  
Damage In Concrete ◽  
Transient Measurements

ABSTRACTThe characteristic of a new form of high strength polymer grid are outlined and its possible uses as reinforcement in concrete subjected to dynamic loading are discussed. Details are given of a test programme in which concrete slabs reinforced with a range of grid types in various configurations have been subjected to explosive loading from contact charges of plastic explosive. A range of both transient and post-test measurements were taken. Results are presented showing how the various damage parameters measured vary with the position and number of polymer grids used in the slabs. The results of the transient measurements are used to suggest mechanisms for damage formation. It is concluded that these polymer grids are effective in restraining explosively generated damage in concrete slabs and that in many circumstances their light weight and their inherent resistance to normal corrosion processes may give them significant advantages over conventional steel reinforcement.

scholarly journals Verification of prying effect in prestressed end-plate connection

2013 ◽  
Vol 12 (2) ◽  
pp. 251-258
Author(s):  
Krzysztof Ostrowski ◽  
Jan Łaguna ◽  
Aleksander Kozłowski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Strength ◽  
Experimental Tests ◽  
Analytical Models ◽  
End Plate ◽  
Plate Connections ◽  
Plate Connection ◽  
Element Method

End-plate connections are very often used is steelwork, as tension and bending connections. As a result of deflection of end plate, additional forces, known as prying forces arise and consequently increase stresses in bolts. Eurocode 1993-1-8 do not distinguish end-plate connections prestressed by high strength bolts from non-prestressed. The aim of the paper is to perform the comparison of previous analytical models and code regulations for coefficient of prying forces to the experimental tests and modelling by finite element method. Results of the analysis show that the behaviour of prestressed connection is essentially different with comparison to non-prestressed.

Research on seismic performance of prefabricated concrete-filled steel tubular frame joints

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Shufeng Li ◽  
Di Zhao ◽  
Yating Zhou
Keyword(s):  
Seismic Performance ◽  
High Strength ◽  
Steel Tube ◽  
Equivalent Viscous Damping ◽  
Concrete Filled Steel Tube ◽  
Content Type ◽  
Finite Element Software ◽  
End Plate ◽  
Good Energy ◽  
Plate Connection

PurposeConcrete-filled steel tube structures are widely used for their high bearing capacity, good plasticity, good fire resistance and optimal seismic performance. In order to give full play to the advantages of concrete-filled steel tube, this paper proposes a prefabricated concrete-filled steel tube frame joint.Design/methodology/approachThe concrete-filled steel tube column and beam are connected by high-strength bolted end-plate, and the steel bars in the concrete beam are welded vertically with the end-plates through the enlarged pier head. In addition, the finite element software ABAQUS is used numerically to study the seismic performance of the structure.FindingsThe ductility coefficient of the joint is in 1.72–6.82, and greater than 2.26 as a whole. The equivalent viscous damping coefficient of the joint is 0.13–3.03, indicating that the structure has good energy dissipation capacity.Originality/valueThe structure is convenient for construction and overcomes the shortcomings of the previous on-site welding and on-site concrete pouring. The high-strength bolted end-plate connection can effectively transfer the load, and each component can give play to its material characteristics.

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