scholarly journals The Pull-out Capacity of Suction Caissons in Model Investigations

2016 ◽  
Vol 63 (2-3) ◽  
pp. 157-171
Author(s):  
Andrzej Sawicki ◽  
Łukasz Wachowski ◽  
Marek Kulczykowski
Keyword(s):  
Model Experiment ◽  
Extraction Process ◽  
Experimental Results ◽  
Scale Model ◽  
Small Scale ◽  
Extensive Discussion ◽  
Pull Out ◽  
Small Scale Model ◽  
Suction Caissons ◽  
Good Agreement

AbstractA small-scale model experiment on the pull-out resistance of suction caissons is described. The pull-out force and suction developed within the caisson in the extraction process were recorded during the experiment. A simple breakout model, together with an elementary static formulae, is applied to predict the results obtained experimentally. There is a reasonably good agreement between the experimental results and predictions. An extensive discussion of the approach applied is included. The analysis presented in this paper is original, as it differs from other approaches mentioned in this paper, and leads to acceptable predictions. At the end, the results are also compared with another approach for predicting the capacity of suction caissons.

Wave Energy Hyperbaric Device for Electricity Production

2007 ◽  
Author(s):  
Segen F. Estefen ◽  
Paulo Roberto da Costa ◽  
Eliab Ricarte ◽  
Marcelo M. Pinheiro
Keyword(s):  
Power Generation ◽  
Wave Energy ◽  
Experimental Results ◽  
Electricity Production ◽  
Scale Model ◽  
Small Scale ◽  
Regular Waves ◽  
Hyperbaric Chamber ◽  
Small Scale Model

Wave energy is a renewable and non-polluting source and its use is being studied in different countries. The paper presents an overview on the harnessing of energy from waves and the activities associated with setting up a plant for extracting energy from waves in Port of Pecem, on the coast of Ceara State, Brazil. The technology employed is based on storing water under pressure in a hyperbaric chamber, from which a controlled jet of water drives a standard turbine. The wave resource at the proposed location is presented in terms of statistics data obtained from previous monitoring. The device components are described and small scale model tested under regular waves representatives of the installation region. Based on the experimental results values of prescribed pressures are identified in order to optimize the power generation.

Pipeline plough performance in sand waves. Part 2: kinematic calculation method

2010 ◽  
Vol 47 (1) ◽  
pp. 65-77 ◽  
Author(s):  
Mark Fraser Bransby ◽  
Michael John Brown ◽  
Keith Lauder ◽  
Andrew Hatherley
Keyword(s):  
Calculation Method ◽  
Wave Amplitude ◽  
Scale Model ◽  
Sand Wave ◽  
Small Scale ◽  
Offshore Pipelines ◽  
Sand Waves ◽  
Calculation Methodology ◽  
Small Scale Model ◽  
Good Agreement

Offshore pipelines can be buried in the seabed by ploughing a trench, placing the pipe at its base, and then backfilling. The presence of sand waves or megaripples on the seabed surface can affect the progress of the plough and prevent the plough from generating a level trench with a uniform trench depth. A calculation method has been presented that makes assumptions about the motion of the plough to predict the kinematics of ploughs through regions of nonuniform seabeds. Results from the calculation methodology are compared with those from small-scale model tests with good agreement, and the detailed kinematics of ploughs are then examined. The calculation method suggests that as a plough moves through a sand-wave field, the oscillation of the plough about the skids results in the trench base being formed alternately by the share tip and heel. The new method allows prediction of likely offshore plough performance given known plough geometry, sand wavelength, and wave amplitude and may be used as a tool for assessing the feasibility of pipeline ploughing in zones of sand waves or megaripples.

Dynamic Behavior of Nagawado Arch Dam in the Event of 1984 Naganoken Seibu Earthquake

1987 ◽  
Vol 3 (2) ◽  
pp. 347-364 ◽  
Author(s):  
T. Fujii ◽  
K. Egawa ◽  
I. Katayama
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Arch Dam ◽  
Scale Model ◽  
Small Scale ◽  
Vibration Modes ◽  
Band Pass ◽  
Small Scale Model ◽  
Good Agreement ◽  
Foundation Rock

Nagawado dam, a slender arch dam of 155 m height and 355.5 m chord length, recorded maximum accelerations of 193 and 242 gal at the crown and the 1/4 point of the crest arch, respectively, in the September 14, 1984 Naganoken Seibu earthquake of magnitude 6.8. The maximum accelerations in the foundation rock were in the range of 21 to 31 gal. Fourier analysis and band-pass filtering of corrected accelerograms, and spatial and temporal diagrams of the computed displacements of the dam and the foundation indicate the significant structural modes of peak frequencies 3.3, 3.6, 4.7, and 5.5 Hz. These frequencies correspond to the antisymmetric first, the symmetric first, the symmetric second, and the antisymmetric second modes of the dam. The first three peak frequencies were in good agreement with the values of corresponding vibration modes obtained by a small-scale model test. The derived frequencies and vibration modes were found also compatible with the results of eigenvalue analysis of a preliminary 3-D finite-element model as a whole. Orthogonal sets of accelerograms recorded at the points across a treated fracture zone in the foundation rock did not record any significant relative motions.

Missile Firing Tests at Stationary Targets in Support of Blade Containment Design

1976 ◽  
Vol 98 (2) ◽  
pp. 159-164 ◽  
Author(s):  
J. I. Goatham ◽  
R. M. Stewart
Keyword(s):  
Minimum Weight ◽  
Turbine Blades ◽  
Scale Model ◽  
Small Scale ◽  
Satisfactory Explanation ◽  
Containment Problem ◽  
Compressor And Turbine Blades ◽  
Small Scale Model ◽  
Firing Tests ◽  
Good Agreement

Compressor and turbine blades of aircraft engines are liable to failure from a number of causes. Their subsequent containment within the immediate confines of the engine has long posed problems for the designer aiming for minimum weight designs. To assist the understanding of the dynamics of the containment problem, a series of small scale model tests have been conducted. The particular tests reported, deal with the failure mechanism at the point of impact. A theoretical analysis in support of the results obtained is developed. Fairly good agreement is obtained between tests and theory and the read-across to full scale containment tests indicates that the containment problem is capable of scaling if linear velocities are kept constant. A discontinuity in the behavior of materials with respect to their just contained energy capacity has been identified. While several contributory factors can be suggested, a fully satisfactory explanation is not found.

Reinforced Ice and Ice Domes: Opportunities for the North*

1988 ◽  
Vol 3 (2) ◽  
pp. 84-102 ◽  
Author(s):  
P.G. Glockner
Keyword(s):  
Tensile Strength ◽  
Scale Model ◽  
Small Scale ◽  
Construction Technique ◽  
The North ◽  
Pull Out ◽  
Initiation And Propagation ◽  
University Of Calgary ◽  
The University ◽  
Small Scale Model

It is suggested that reinforced ice domes in spans up to 100–150 metres and constructed by spraying water onto a spherical inflatable membrane could be economic solutions for constructing temporary enclosures in cold regions. The feasibility and practicability of such a novel and economical erection/construction technique has been demonstrated at The University of Calgary by constructing small-scale model ice domes and testing them until failure. Details of this erection technique, properties of the reinforcement (spun fibreglass yarn) and the load-deflection-time behaviour of the model domes are described. The first part of the paper gives some results on the short-duration load and creep response of unreinforced and reinforced ice samples, including shear. pull-out/bond and tensile strength. The results indicate that such fibreglass yarn reinforcement does not enhance the shear strength of ice but does inhibit initiation and propagation of cracking and thereby increase the ultimate tensile strength of the composite.

Staged-Air Ratio Optimization for a New Down-Fired Technology within a Cold Small-Scale Model of a 350 MWeUtility Boiler

2011 ◽  
Vol 25 (4) ◽  
pp. 1485-1496 ◽  
Author(s):  
Min Kuang ◽  
Zhengqi Li ◽  
Pengfei Yang ◽  
Jinzhao Jia ◽  
Qunyi Zhu
Keyword(s):  
Scale Model ◽  
Small Scale ◽  
Ratio Optimization ◽  
Small Scale Model

scholarly journals Monitoring deformation of small scale model tunnels under load testing

Survey Review ◽  
2014 ◽  
Vol 46 (339) ◽  
pp. 417-425 ◽  
Author(s):  
H-M. Chen ◽  
M. Smith ◽  
H-S. Yu ◽  
N. Kokkas
Keyword(s):  
Scale Model ◽  
Small Scale ◽  
Load Testing ◽  
Small Scale Model
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