EXPERIMENTAL AND NUMERICAL STUDIES OF STRUCTURAL PERFORMANCE OF NOTCH DAMAGED STEEL BEAMS

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Said Elkholy ◽  
Bilal El-Ariss
Keyword(s):  
Three Dimensional ◽  
Structural Performance ◽  
Steel Beams ◽  
Beam Specimen ◽  
Test Results ◽  
Numerical Studies ◽  
Bare Steel ◽  
Three Dimensional Models ◽  
Good Agreement ◽  
Opening Width

Performance of notch damaged unrepaired steel I-shaped beam specimens was examined experimentally and numerically simulated using finite element modeling. Nine U-shaped notch damaged specimens and one control beam specimen were considered. The nine unrepaired laterally unsupported I-shaped full-scale steel specimens were tested in two-point loadings and the parameters considered in the study were the size and location of the notch. The notch size was 30 mm, 40 mm, and 60 mm in depth with a constant opening width of 20 mm. The location of the notch was at one-quarter, one third, and middle of the specimen clear span. All pre-damaged specimens had notches on one side of the tension flange with respect to the beam web except for two specimens where two notches were cut at the middle of the specimen clear span on both sides of the tension flange. The test specimens were modeled analytically using three-dimensional models of the bare-steel I-shaped specimens for comparison of the analytical predictions with experimental results. The test results showed the strength of the notched beams was hardly affected by the notch size or location. However, the stiffness of the beams was slightly decreased as the notch got closer to the mid-span with increased ductility. The corresponding analytical results were in good agreement with the test data.

A System of Selective Non Catalytic Reduction of NOx for Diesel Engine

2011 ◽  
Vol 201-203 ◽  
pp. 643-646 ◽  
Author(s):  
Bo Yan Xu ◽  
Hai Ying Tian ◽  
Jie Yang ◽  
De Zhi Sun ◽  
Shao Li Cai
Keyword(s):  
Catalytic Reduction ◽  
Three Dimensional ◽  
Exhaust Gas ◽  
Test Results ◽  
Practical Application ◽  
Three Dimensional Model ◽  
Reduction Efficiency ◽  
Different Temperatures ◽  
Reduction Of Nox ◽  
Good Agreement

SNCR (Selective Non Catalytic Reduction) system is proposed, with 40% methylamine aqueous solution as reducing agent to reduce NOx in diesel exhaust gas. The effect of injection position and volume on the reduction efficiency through the test bench is systematically researched. A three-dimensional model of a full-sized diesel SNCR system generated by CFD software FIRE is used to investigate the reduction efficiency under different temperatures. The simulated results have a good agreement with the test results, and it can be used to optimize SNCR system. The results can indicate the practical application of this technology.

Particle Based Numerical Analysis of Green Water on FPSO Deck

2013 ◽  
Author(s):  
Cezar Augusto Bellezi ◽  
Liang-Yee Cheng ◽  
Kazuo Nishimoto
Keyword(s):  
Experimental Data ◽  
Numerical Analysis ◽  
Sea Water ◽  
Three Dimensional ◽  
High Amplitude ◽  
Green Water ◽  
Scale Models ◽  
Three Dimensional Models ◽  
Reduced Scale ◽  
Good Agreement

The green water phenomenon is boarding of sea water onto the deck due to high amplitude waves, which can cause several damages to the equipment on deck. In the present paper the green water phenomenon on three-dimensional models is analyzed using the Moving Particles Semi-Implicit Method (MPS), a fully lagrangian method for incompressible flow. This work is focused on the validation of the method comparing the numerical results with experimental results for green water on reduced scale models. The pressure on sensors over the deck of the models shows good agreement with experimental data.

scholarly journals Structural Performance of a Precast Concrete Modular Beam Using Bolted Connecting Plates

2021 ◽  
Vol 11 (24) ◽  
pp. 12110
Author(s):  
Kyong Min Ro ◽  
Min Sook Kim ◽  
Chang Geun Cho ◽  
Young Hak Lee
Keyword(s):  
Precast Concrete ◽  
Steel Plates ◽  
Structural Performance ◽  
Modular System ◽  
Beam Specimen ◽  
Test Results ◽  
Reinforcing Bars ◽  
Bolted Connection ◽  
Modular Units ◽  
Modular Structures

In modular structures, prefabricated modular units are joined at the construction site. Modular structures must ensure splicing performance by connecting modular units sufficiently. The bolted connection using steel plates may suffer from alignment issues and corrosion problems. In a precast concrete (PC) modular system, there is difficulty grouting the sleeves when splicing reinforcing bars. This study proposed a PC modular beam using a bolted connecting plate to deal with issues in typical steel modules and PC modules. The structural performance was evaluated by flexural and shear tests on two monolithic beams and two proposed PC specimens. The test results showed that the structural performance of the PC modular specimen was 88% of that of the monolithic reinforced concrete (RC) beam specimen and 102% of the strength calculated by ACI 318-19. Therefore, the proposed PC modular system using bolted connecting plates can solve the problems observed in typical steel and PC modules and improve the structural performance.

Stress analysis of cylindrical shells with nozzles due to external run pipe moments

2000 ◽  
Vol 35 (3) ◽  
pp. 159-170 ◽  
Author(s):  
M. D Xue ◽  
H. H Wang ◽  
K. C Hwang
Keyword(s):  
Thin Shell ◽  
Cylindrical Shells ◽  
Large Diameter ◽  
Three Dimensional ◽  
Diameter Ratio ◽  
Test Results ◽  
Present Solution ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Good Agreement

In this paper the analytical results of two normally intersecting cylindrical shells subjected to external moments on the ends of main shells are presented. The thin shell theoretical solutions are obtained on the basis of the modified Morley equation for the main shell with a cut out with large diameter ratio and of the Goldenveizer equation for the branch tube with a nonplaner end. The results are in good agreement with the previous test results and with Moffat's three-dimensional finite element method results. The design curves based on the present solution can be applied to d/D ≤ 0.8 successfully.

scholarly journals Flexural Performance Evaluation of Novel Wide Long-Span Composite Beams Used to Construct Lower Parking Structures

2019 ◽  
Vol 12 (1) ◽  
pp. 98
Author(s):  
Yun-Chul Choi ◽  
Doo-Sung Choi ◽  
Keum-Sung Park ◽  
Kang-Seok Lee
Keyword(s):  
Flexural Strength ◽  
Composite Beams ◽  
Steel Beams ◽  
Test Results ◽  
Element Analysis ◽  
Bending Tests ◽  
Flexural Performance ◽  
Long Span ◽  
Global And Local ◽  
Good Agreement

Efficient parking structures are urgently required in Korea. The design of parking structures more than 8 m in height is difficult because both fire and seismic resistance must be considered. Existing designs are uneconomical and conservative. However, the design of parking structures less than 8 m in height is relatively simple and there are few restrictions to the construction. It is essential to optimize the design of parking structures less than 8 m in height. Here, we describe novel wide long-span composite beams that reduce the story height of low parking structures. The flexural capacity of seven of the beams was evaluated; all beams were loaded at two points prior to monotonic bending tests. We also performed finite element analysis (FEA) based on the material properties of the test specimens, and compared the results to those of the structural tests. The flexural strength of the wide composite steel beams increased by approximately 20% as the steel thickness rose by 3 mm, from 6 to 9 mm. The rebar shape (triangular or rectangular) did not affect flexural strength. The flexural strength of beams without rebar was 10% less than that of beams with rebar. The FEA and test results were in good agreement. The section plastic moments were free from global and local instability.

scholarly journals Numerical studies on residual strength of dented tension leg platforms under compressive load

2020 ◽  
Vol 14 (3) ◽  
pp. 96-109
Author(s):  
Quang Thang Do ◽  
Van Nhu Huynh ◽  
Dinh Tu Tran
Keyword(s):  
Axial Compression ◽  
Residual Strength ◽  
Compressive Load ◽  
Element Model ◽  
Test Results ◽  
Offshore Structure ◽  
Numerical Studies ◽  
Commercial Software Package ◽  
Dent Depth ◽  
Good Agreement

This paper focuses on numerical investigations and derived formulation to evaluate the residual strength of tension leg platforms (TLPs) with the local denting damage under axial compression loading. The damage generation scenarios in this research are represented the collision accidents of offshore stiffened cylinders TLPs with supply ships or floating subjects. The finite element model is performed using a commercial software package ABAQUS, which has been validated against the experiments from the authors and other researchers. Case studies are then performed on design examples of LTPs when considering both intact and damaged conditions. Based on the rigorous numerical results, the new simple design formulations to predict residual strength of dented TLPs are derived through a regression study as the function of a non-dimensional dent depth. The accuracy and reliability of the derived formulation are validated by comparing it with the available test results in the literature. A good agreement with existing test data for ship-offshore structure collisions is achieved. Keywords: dented stringer-stiffened cylinder; residual strength; tension leg platforms (LTPs); axial compression; residual strength formulation.

Calculation method for the shear bearing capacity of diaphragm-through connections

2016 ◽  
Vol 20 (6) ◽  
pp. 906-916 ◽  
Author(s):  
Liao Wu ◽  
Zhihua Chen ◽  
Bin Rong
Keyword(s):  
Calculation Method ◽  
Three Dimensional ◽  
Low Frequency ◽  
Shear Behavior ◽  
Shear Capacity ◽  
Steel Beams ◽  
Test Results ◽  
Tubular Columns ◽  
Panel Zone ◽  
Shear Bearing Capacity

This article presents the results of experimental, numerical, and theoretical studies into the shear behavior of panel zone of diaphragm-through connections between concrete-filled square steel tubular columns and steel beams. The current design code does not cover the yield and ultimate shear strengths of such connections in China. Five tee-shaped diaphragm-through connections were fabricated and tested that they comply with the principle of “strong members and weak panel zone.” Three-dimensional nonlinear finite element models were developed to study the shear behavior of the panel zone under low-frequency cyclic loading. Based on the test results, the force transfer mechanism and the effect of different factors on the panel zone shear capacity were analyzed. The width and deformation of compression strut of core concrete were taken into account. A simple manual calculation method was also proposed for evaluating the shear strength of panel zone of diaphragm-through connections. Good agreement was found between theoretical and test results for both yield and ultimate shear strengths for connections.

Horizontal pressure on barricades for backfilled stopes. Part I: Fully drained conditions

2009 ◽  
Vol 46 (1) ◽  
pp. 37-46 ◽  
Author(s):  
Li Li ◽  
Michel Aubertin
Keyword(s):  
Three Dimensional ◽  
Stress Transfer ◽  
Companion Paper ◽  
Underground Mines ◽  
Physical Model Test ◽  
Test Results ◽  
Working Space ◽  
Horizontal Pressure ◽  
Backfilled Stopes ◽  
Good Agreement

Stope backfilling is used in underground mines to provide a safer working space for personnel and machinery. To ensure a secure application of backfill, it is critical to accurately evaluate the pressures exerted on the walls and barricades placed near the base of the stope to retain the fill materials. In this paper, existing solutions for evaluating the stresses on barricades are reviewed. The authors then propose a new three-dimensional analytical solution that takes into account the stress transfer from the backfill to the walls in both the stope and access drift. In particular, the solution considers the influence of the barricade position within the drift on the stress state. Comparisons are made between the proposed solution, physical model test results, and numerical simulations. The good agreement between various results indicates that the proposed formulation provides a good estimate of the pressure on a barricade. The solution presented here is applicable to fully drained backfill (without water-pore pressure); the solution for saturated backfill is given in a companion paper (see Part II, this issue).

Thermal Analysis of Dedicated Computer Based on ANSYS

2011 ◽  
Vol 697-698 ◽  
pp. 277-281
Author(s):  
Y.R. Zhang ◽  
L. Gao ◽  
S.J. Li ◽  
H.X. Bi
Keyword(s):  
Thermal Analysis ◽  
Material Properties ◽  
Theoretical Basis ◽  
Three Dimensional ◽  
Test Results ◽  
Post Processing ◽  
Ansys Software ◽  
Computer Based ◽  
Three Dimensional Models ◽  
Setting Parameters

After creating the three-dimensional models of dedicated computer, models can be smoothly put into ANSYS through interface between Pro/E and ANSYS. By selecting the grid cells, setting parameters of material properties, dividing grids, applying load and boundary conditions and post-processing, the temperature contours of the whole case and its key components are got. Compared with the test results, it was verified that the feasibility and rationality of carrying out thermal simulation by ANSYS software, providing a theoretical basis for the designers to optimize dedicated computer case.

Interaction between two laser-induced cavitation bubbles in a quasi-two-dimensional geometry

2009 ◽  
Vol 633 ◽  
pp. 425-435 ◽  
Author(s):  
PEDRO A. QUINTO-SU ◽  
CLAUS-DIETER OHL
Keyword(s):  
Potential Flow ◽  
High Speed ◽  
Three Dimensional ◽  
Interaction Force ◽  
High Speed Photography ◽  
Two Dimensional ◽  
Experimental Conditions ◽  
Numerical Studies ◽  
Cavitation Bubbles ◽  
Good Agreement

We report on experimental and numerical studies of pairs of cavitation bubbles growing and collapsing close to each other in a narrow gap. The bubbles are generated with a pulsed and focused laser in a liquid-filled gap of 15 μm height; during their lifetime which is shorter than 14 μs they expand to a maximum radius of up to Rmax = 38 μm. Their motion is recorded with high-speed photography at up to 500000 frames s−1. The separation at which equally sized bubbles are created, d, is varied from d = 46–140 μm which results into a non-dimensional stand-off distance, γ = d/(2Rmax), from 0.65 to 2. For large separation the bubbles shrink almost radially symmetric; for smaller separation the bubbles repulse each other during expansion and during collapse move towards each other. At closer distances we find a flattening of the proximal bubbles walls. Interestingly, due to the short lifetime of the bubbles (≤14 μs), the radial and centroidal motion can be modelled successfully with a two-dimensional potential flow ansatz, i.e. neglecting viscosity. We derive the equations for arbitrary configurations of two-dimensional bubbles. The good agreement between model and experiments supports that the fluid dynamics is essentially a potential flow for the experimental conditions of this study. The interaction force (secondary Bjerknes force) is long ranged dropping off only with 1/d as compared to previously studied three-dimensional geometries where the force is proportional to 1/d2.

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