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Dissertations / Theses on the topic 'Bulkhead'
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1
Erskine, Jon S. "Effects of welding on energy dissipation in a watertight bulkhead." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FErskine.pdf.
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Vellone, Davide. "Ottimizzazione strutturale di una bulkhead di fusoliera di velivoli da trasporto commerciale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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The present state-of-the-art of the rear pressure bulkhead foresees the use of two types of materials: aluminium alloy Al2024 (exploited in the applications where tensile or fatigue loads are predominant like in the fuselage paneling) and composite materials (carbon fiber reinforced polymer).
For the metallic case, the problem of the deep drawing of an aluminium alloy sheet into a hemispheric dome consists in the phenomenon of wrinkles formation (wrinkling); this is linked to the thickness of the plate and its dimensions.
In this thesis we provide a carrying out solution by additive manufacturing.
On the base of what developed by Airbus, which created AM spoiler prototypes taking inspiration from the structure of lily pad, this thesis work aims to develop a bulkhead and its stiffeners design optimization.
The use of additive manufacturing in the bulkhead production shows two big advantages compared to traditional working: the chance to create complex geometries and the absence of internal residual stress and wrinkling phenomenon.
The analysis of the studied structures allows to verify
advantage of the rounded bulkhead configuration instead of the plane one (almost one lower order of magnitude for displacements), structural optimization due to stiffeners, consistency with lily pad shape.
3
Brown, Christian R. (Christian Randall). "Effect of hull-to-bulkhead flexible connection on blast resistance of double hulled ships." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/33434.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.Includes bibliographical references (p. 65).
The use of double hull construction is commonplace within the shipping industry though it is largely unexploited within naval vessels. The Impact and Crashworthiness Lab at MIT has proposed the use of adaptive sandwich structures to improve the blast resistance of naval hulls. This project will address two main areas of investigation through the use of simplified analytical models: the integration of hardening and softening plastic core responses in the crushing of a rigidly supported sandwich panel; and the deformation analysis of a sandwich panel supported by non-rigid connections. The analytical solutions were utilized to perform a series of parametric studies to evaluate both the useable range of the models as well as to investigate the general behavior of a sandwich panel under a uniform load when supported by crushable connections. This initial investigation provides the simplified tools to begin and to validate a more detailed, numerical analysis.
by Christian R. Brown.
S.M.
4
Hendrickson, Carl E. II. "Modeling the Effect of a Compartment Fire on Spaces Adjacent to a Bulkhead With and Without Attachments." ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2609.
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Structural fire protection is an integral component of shipboard fire safety. There are national and international regulations that delineate requirements for the insulation placed throughout ships. The attachments that penetrate the insulation for hanging wires and pipes can disrupt the integrity of the division, and cause a failure to adhere to the regulations. This problem will be analyzed by using a simplified lumped capacitance model and ANSYS FLUENT CFD. A standard time-temperature fire curve is applied to the fire side of the enclosure. The thermal conductivity of the insulation and steel are made to be temperature dependent. The density of the air of the non-fire side is then approximated using the Boussinesq approximation for lower temperature differences and the incompressible ideal gas law for higher temperature differences. Different attachments of varying surface areas and volumes are exposed to the standard time-temperature fire curve and their heat transfer capabilities are analyzed.
5
Ferrari, Alberto. "Analytical model for the prediction of wrinkling of rear pressure bulkheads." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8587/.
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In Airbus GmbH (Hamburg) has been developed a new design of Rear Pressure Bulkhead (RPB) for the A320-family. The new model has been formed with vacuum forming technology. During this process the wrinkling phenomenon occurs. In this thesis is described an analytical model for prediction of wrinkling based on the energetic method of Timoshenko. Large deflection theory has been used for analyze two cases of study: a simply supported circular thin plate stamped by a spherical punch and a simply supported circular thin plate formed with vacuum forming technique. If the edges are free to displace radially, thin plates will develop radial wrinkles near the edge at a central deflection approximately equal to four plate thicknesses w0/ℎ≈4 if they’re stamped by a spherical punch and w0/ℎ≈3 if they’re formed with vacuum forming technique. Initially, there are four symmetrical wrinkles, but the number increases if the central deflection is increased. By using experimental results, the “Snaptrhough” phenomenon is described.
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Di, Santi Filippo. "Ottimizzazione topologica di paratie di pressurizzazione di velivoli commerciali." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
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In questa tesi sono trattate la produzione e l'ottimizzazione di paratie di pressurizzazione di velivoli commerciali.
Sono stati confrontati i dati inerenti alla piegatura della paratia provenienti dall'equazione analitica e dall'analisi FEM, mentre, per quanto riguarda l'ottimizzazione, è stato effettuato uno studio sui rinforzi alla ricerca della soluzione migliore in termini di peso e di distribuzione delle tensioni.
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Ling, Qi. "Design of Automotive Joints Using Response Surface Polynomials and Neural Networks." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/45205.
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In the early design stages of a car body, a simplified model, which represents the constituent components of the car body by their performance characteristics, is used to optimize the overall car. The determined optimum performance characteristics of the components are used as performance targets to design these components. Since designers do not know the relation between the performance characteristics of the components and their dimensions and mass, this may lead to unreasonable performance targets for the components. Moreover, this process is inefficient because design engineers use empirical procedures to design the components that should meet these targets. To design the component more efficiently, design tools are needed to link the performance targets with the physical design variables of the components.
General methodologies for developing two design tools for the design of car joints are presented. These tools can be viewed as translators since they translate the performance characteristics of the joint into its dimensions and vice-versa. The first tool, called translator A, quickly predicts the stiffness and the mass of a given joint. The second tool, called translator B, finds the dimensions and mass of the most efficient joint design that meets given stiffness requirements, packaging, manufacturing and styling constraints.
Putting bulkheads in the joint structure is an efficient way to increase stiffness. This thesis investigates the effect of transverse bulkheads on the stiffness of an actual B-pillar to rocker joint. It also develops a translator A for the B-pillar to rocker joint with transverse bulkheads. The developed translator A can quickly predict the stiffness of the reinforced joint.
Translator B uses optimization to find the most efficient, feasible joint design that meets given targets. Sequential Linear Programming (SLP) and the Modified Feasible Direction (MFD) method are used for optimization. Both Response Surface Polynomial (RSP) translator B and Neural Network (NN) translator B are developed and validated. Translator A is implemented in an MS-Excel program. Translator B is implemented in a MATHEMATICA program.
The methodology for developing translator B is demonstrated on the B-pillar to rocker joint of an actual car. The convergence of the optimizer is checked by solving the optimization problem many times starting from different initial designs. The results from translator B are also checked against FEA results to ensure the feasibility of the optimum designs. By observing the optimum designs and by performing parametric studies for the effect of some important design variables on the joint mass we can establish guidelines for design of joints.Master of Science
8
Schneider, William Frank. "Eigenvalue veering and mode localization in a hemispherically capped ciruclar cylindrical shell with an elastic bulkhead at midplate." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/17956.
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Baumann, Gregg W. "Linear structural stress analysis of a hull girder penetration and a short longitudinal bulkhead using finite element modeling." Thesis, Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/8623.
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Approved for public release; distribution unlimited.The objective of this study is to investigate structural shadow zones encountered in shipbuilding design using the I-DEAS (Integrated Design Engineering Analysis Software) software. The term 'shadow zone' refers to areas of low stress concentrations that are caused by lines of stress bending around structural discontinuities. Two ship design situations frequently encountered that result in shadow zones are hull girder penetrations and short structural longitudinal bulkheads. In both of these situations, a long-used rule of thumb is to construct a line with a slope of 1:4 originating from the. discontinuity that encompasses the area of low stress. The material within this line is then considered ineffective when computing the section modulus. This can prove to be expensive. However, powerful finite element analysis software is readily available that can analyze the shadow zones in greater detail and possibly minimize the area considered ineffective. This study uses the I-DEAS software to develop finite element models of the cited design situations for a U.S. Navy Frigate, FFG-7 class of ship. It conducts a static structural linear analysis of the ship balanced on a trochoidal wave of height 1.1 VL. The results generated in this study validate the rule of thumb in both situations
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Hayner, Mark A. (Mark Andrew). "Wave-based finite element method applied to thick, in-vacuo, cylindrical shells with keel or bulkhead plate attachments at middle to high frequency." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47563.
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Andreotti, Elena. "Study of an alternative structural solution for the new quay of Trattaroli Terminal in Ravenna." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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The thesis developed, aims the entire design for the new quay structure of Trattaroli peninsula in the port of Ravenna. The topic has been developed during a stage, lasting five months, at Sapir Engineering S.r.l. that operates in the field of public and private civil engineering works.
The Port of Ravenna is the main port of Emilia-Romagna region. Docks are mainly on a channel that connects the town centre of Ravenna to the open sea, which is almost 10,00 km away. It hosts shipyards, multipurpose terminals, bulk cargo terminals and a containerized cargo terminal. The study at issue, regards the Candiano Channel, in particular the Trattaroli peninsula, located in the internal part of the Corsini Port that connects the centre of Ravenna with the open sea and is part of the commercial and industrial port.
Specifically, in the thesis, it has been modified the existing project with new technological solutions and using alternative materials for structural and lasting performance improvements. For this reason, some numerical models have been applied to elaborate the study in terms of hydraulic, geotechnical and structural design.
12
Farhang, Mehr Farzaneh. "An investigation of the efficacy of a water-cooled chill in improving the as-cast structure of the main bearing bulkhead in A319 engine blocks." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63809.
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In recent years, the automotive industry has been increasing the production of small, high-power gas engines as part of several strategies to achieve the new “Corporate Average Fuel Economy” (CAFE) standards, while at the same time meeting consumer demand for increased performance. This trend requires an improvement in the thermal and mechanical fatigue durability of the aluminium alloys used in the production of the cylinder heads and engine blocks in these engines. In the absence of modifying alloy chemistry, which potentially has significant implications for downstream operations such as heat treating and machining, one viable way to improve fatigue performance is to reduce the length-scales of the microstructural features arising from solidification that limit fatigue life. This, in turn, may be achieved by increasing the cooling rate during solidification (reducing the solidification time). Conventionally, solid chills are employed in industry to achieve this. A potential means of improving the efficacy of these chills is to incorporate water cooling. To assess the effectiveness of this method, a water-cooled chill was designed at UBC and installed in a bonded-sand engine block mould package (1/4 section). Twelve experiments were conducted with both a conventional solid chill and with a water-cooled chill (with and without a delay in water cooling). The moulds were instrumented with thermocouples to measure the evolution of temperature at key locations in the casting, and “Linear Variable Displacement Transducers” (LVDTs) to measure the gap size at the interface between the chill and the casting. A coupled thermal-stress mathematical model was developed in “ABAQUS 2016” to reproduce the experimental conditions and provide insight into interfacial heat transport and gap dynamics. Overall, the experimental and modelling results show the gap dynamics are complex and play a critical role in governing heat transport. If implemented carefully, the adoption of water-cooled chill technology has the potential to improve the cast microstructure, hence, increase the fatigue durability of the engine blocks.Applied Science, Faculty of
Materials Engineering, Department of
Graduate
13
Mohamed, Hassan Liban, and Haris Hodzic. "Modular and Flexible Payload Arrangement : With Reconfigurable Floors and Sliding Bulkheads." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21854.
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Background The shipbuilding trends have changed from being single purpose ships only to using modular and flexible parts or systems to carry out multiple missions with as few ships as possible to minimize the ecological and economic impact. A flotilla can become smaller by having multiple ships capable of carrying out various missions instead of single-purpose ships. Objectives The objectives throughout the thesis are to provide an insight into how the trends today are affecting the market of surface ships and to study how a reconfigurable floor can be combined with a sliding bulkhead to be implemented into the cargo space. The developed concept needs to meet the regulations set by DNV-GL, which are an international classification society that is experts in risk management and quality assurance. This master’s thesis focuses on how to implement modularity and flexibility in payload arrangement for surface ships. Method The work process is based on the methodology design thinking’s four phases, which are initiation, inspiration, ideation, and implementation. Throughout the project, a trendwatching was conducted to determine the most impactful trends on the naval market. Using semi-structured interviews, techwatching and brainstorming iterations, a requirements list was defined to support the concept development. The concepts were weighed against each other, and the highest scoring was developed into a parametric CAD model. The model was later compared to the DNV-GL regulations to see whether the developed concept affects existing systems such as HVAC. Results Some of the top trends that have been affecting the naval market lately is modularity, flexibility, and unmanned surface vessels. The developed concept was a combination of a pallet loading floor and cargo floor rollers for reconfigurable floors and garage door-inspired bulkhead. The concept was visualized in Autodesk Inventor Professional 2020 to be further analyzed and display how the concept operates, its functions and how the system compares to DNV-GL regulations. Conclusions The top trends affecting the naval market are modularity, flexibility, and unmanned surface vessels to mention a few. Some of the regulations from DNV-GL that need to be considered when implementing a modular and flexible payload arrangement are fire protection and tightness requirements. However, the regulations can be stricter or changed depending on the role, design, and placement of the payload arrangement.
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Raymond, Ian K. Mechanical & Manufacturing Engineering Faculty of Engineering UNSW. "Tools for the formation of optimised X-80 steel blast tolerant transverse bulkheads." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2001. http://handle.unsw.edu.au/1959.4/20467.
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The Australian Maritime Engineering Cooperative Research Centre, and its partner organisation initiated this research effort. In particular, BHP and the Defence Science and Technology Organisation held the principal interest, as this research effort was a part of the investigation into the utilisation of X-80 steel in naval platforms. After some initial considerations, this research effort focussed on the development of X-80 steel blast tolerant transverse bulkheads. Unfortunately, due to the Australian Maritime Engineering Cooperative Research Centre not being re-funded after June 2000 and other project factors, the planned blast tests were not conducted, hence this research effort focussed on the tools needed for the formation of optimised blast tolerant transverse bulkheads rather than on the development of a single structural arrangement. Design criteria were formed from the worst case operational requirements for a transverse bulkhead, which would experience a 150 kg equivalent blast load at 8 m from the source. Since the development of any optimised blast tolerant structure had to be carried out using finite element analysis, material constants for X-80 steel under high strain rates were obtained. These material constants were implemented in the finite element analysis and the appropriate solid element size was evolved. The behaviour and effects of stress waves and high strain rates were considered and the literature reviewed, in particular consideration was given to joint structures and weld areas effects on the entire structural response to a blast load. Furthermore, to support the design criteria, rupture prediction and determination methodologies have been investigated and recommendations developed about their relevance. Since the response of transverse bulkheads is significantly affected by their joint and stiffener arrangements, separate investigations of these structures were undertaken. The outcomes of these investigations led to improvements in the blast tolerance behaviour of joints and stiffeners, which also improved the overall response of the transverse bulkhead to air blast loads. Finally, an optimisation procedure was developed that met all the design criteria and its relevant requirements. This optimisation procedure was implemented with the available data, to show the potential to develop optimised X-80 steel blast tolerant transverse bulkheads. Due to the constraints mentioned above the optimisation procedure was restricted, but did show progression towards more effective blast tolerant transverse bulkhead designs. Factors, such as double skin bulkheads, maximising plate separation, and the use of higher yield steel all showed to be beneficial in the development of optimal X-80 steel blast tolerant transverse bulkheads, when compared to the ANZACclass D-36 steel transverse bulkheads.
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Suárez, Espinoza Pablo Andrés [Verfasser], Kai-Uwe [Akademischer Betreuer] Bletzinger, and Horst [Akademischer Betreuer] Baier. "Design Process for the Shape Optimization of Pressurized Bulkheads as Components of Aircraft Structures / Pablo Andrés Suárez Espinoza. Betreuer: Kai-Uwe Bletzinger. Gutachter: Horst Baier ; Kai-Uwe Bletzinger." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1097552497/34.
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LEE, WEI-SHENG, and 李偉聖. "The Biomimetic Design of FRP Bulkhead T-joint." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/6vmvn2.
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碩士國立高雄海洋科技大學
造船及海洋工程研究所
105
Structural glue was employed to design the joints of FRP bulkhead, and the bionic concepts were considered in this study to improve joint’s mechanical and efficiency. Experiment results confirmed that appropriate bionic design can promote the joint strength. However, the failure modes will be different when stacking numbers and bonding range of structural glue were changed. According to bionic concepts, two bionic joint types “tooth-root-like” and “articulation-like”, were discussed in this study. Furthermore, when the bonding range of structural glue is large enough, the bonding strength is almost the same between different joint types. Finally, experiment results confirmed that ball-joint type discussed in this study is the most suitable style to apply in connection with bulkhead and hull shell.
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Huang, Kuan-Yi, and 黃冠益. "Application of Piezo-Material on the Force Measurement of Bulkhead under Sloshing Condition." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/36054332306821933147.
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碩士國立成功大學
系統及船舶機電工程學系碩博士班
97
We would like to use the piezoelectric sensor that measures impact force on the bulkhead under sloshing situation. The sensor is suitable for measuring dynamic pressure, before using the piezoelectric sensor. We need to find out the sensor piezoelectric characteristics through the experiment. Hence, We Design a mechanism to make the tank rolling and simple harmonic motion. The sensor will measure the different impact force with the different rolling cycle. The result proves the piezoelectric sensor is suitable for impact force under sloshing. For PZT-855 piezo-sensor, the experiment comes up with the conclusion: when the included angle between the voltage resulting from direct piezoelectric effect and the time of rising is more the 74 degree, the force and voltage reveal high liner relation. When the angle is less than 74 degree, the force and voltage have high-index number relation. The result shows that piezo-sensor meet the impact force of sloshing.
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Shih, Shao-Ping, and 施紹平. "Evaluating the Safety measure of Local Eco-Technology-Based Bulkhead by Foreign Empirical equations." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/b9k9ke.
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碩士國立臺北科技大學
環境規劃與管理研究所
95
In the recent years, Taiwan has faced several severe floods which made already damaged environment even worse. Severe precipitation often causes rapid flow and large area of inundation. As the government wants to avoid disasters, more and more stream improvement works have been designed using ecological engineering methods. Since ecological engineering practices have resulted in some excellent performance, safety evaluation of stream ecological engineering methods has become a critical focus. However, ecological engineering methods have not yet been fully understood, and therefore a lot of controversial issues exist. This study is to compile local and overseas related formulas for evaluating safety of stream improvement works using ecological engineering methods. An evaluation form was established using various physical parameters, and actual works were evaluated using this form. The safety evaluation form is to be a useful tool for safety evaluation of stream ecological engineering methods, and it can be the reference for research development.
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Raineault, Nicole A. "Effects of bulkheads on estuarine beach swash zone processes and characteristics." 2008. http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17376.
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McCullough, Nason J. "The seismic vulnerability of sheet pile walls." Thesis, 1998. http://hdl.handle.net/1957/33918.
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The seismic performance of port structures has been well documented following
recent earthquakes, and indicates that port structures are highly susceptible to earthquake-induced
damages. These damages are primarily due to soil liquefaction and the associated
ground failures. Sheet pile bulkheads provide vital intermodal and lifeline transportation
links between water-side and land-side traffic, and are waterfront structures particularly
vulnerable to liquefaction-induced damages. Due to the prevalence of liquefaction-induced
damages, many ports are utilizing soil improvement techniques to mitigate these
hazards.
Many port authorities have proposed utilizing performance-based design criteria to
limit potential earthquake-induced damages. The current design method for sheet pile
walls (Mononobe-Okabe) is based on simple, limit equilibrium analysis techniques,
which are poorly suited for performance-based design. Recent advancements in the
seismic design of sheet pile walls have addressed some of the limitations of the current
design methods, but are still inadequate for performing a complete, performance-based design for locations that contain potentially liquefiable soils and/or where soil
improvement strategies have been instituted.
This study has focused on conducting an empirical investigation and numerical
modeling to determine the seismic performance of sheet pile walls, and the performancebased
benefit of soil improvement through densification. A case history validated,
nonlinear effective stress computer program was used to perform numerical parametric
studies on various design parameters (earthquake properties, depth of sheet pile
embedment, sheet pile wall stiffness, tie rod length, density of the backfill, and extent of
soil densification). The results have been presented as a performance-based design
method, and include a design chart that provides practitioners with a preliminary design
tool that may be used to estimate the seismic deformations of sheet pile walls with or
without soil improvement.
The study has demonstrated that soil densification can greatly reduce the seismicallyinduced
deformations, especially when the magnitude of soil improvement extends
beyond the location of the anchor. The study has also demonstrated that the use of soil
densification techniques for mitigating seismic hazards may not be adequate in limiting
deformations to allowable limits, and that other methods of soil improvement
(cementation, drainage, etc.) or structural improvements may also be required.Graduation date: 1998
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Raymond, Ian K. "Tools for the formation of optimised X-80 steel blast tolerant transverse bulkheads /." 2001. http://www.library.unsw.edu.au/~thesis/adt-NUN/public/adt-NUN20041122.094821/index.html.
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Chavan, Dipanjali. "Short-term effects of bulkheads on the bayshore of Fire Island, New York." Thesis, 2005. http://library1.njit.edu/etd/fromwebvoyage.cfm?id=njit-etd2005-047.
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