Dissertations / Theses on the topic 'Curved joints'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 49 dissertations / theses for your research on the topic 'Curved joints.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Wells, Zane B. "Performance of Post-Tensioned Curved-Strand Connections in Transverse Joints of Precast Bridge Decks." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1222.
Salam, Claro Diego. "Wave-based numerical approaches for non-destructive testing of structural assemblies involving straight waveguides and curved joints." Electronic Thesis or Diss., Bourges, INSA Centre Val de Loire, 2024. http://www.theses.fr/2024ISAB0003.
This thesis investigates defect detection and localization within waveguide assemblies, exploring the interaction between waves in straight waveguides with curved joints and defects. For this purpose, the Wave Finite Element (WFE) method is used. Numerical experiments validate the robustness and accuracy of the WFE method through comparisons with analytical and Finite Element solutions, particularly focusing on dispersion curves and forced responses. Extending the investigation to assemblies with coupling elements, such as joints and defects, the study highlights the efficiency of the WFE method in scenarios involving waveguides.A novel strategy is proposed within the scattering matrix formalism for defect localization, with a specific emphasis on structures containing curved joints. The approach relies on computing the time of flight of narrow wavepackets transmitted or reflected at a coupling element. The strategy is validated through numerical simulations, showcasing precision in defect localization for diverse scenarios, including 2D plane-stress beams and pipes, with a curved joint and a defect.Elasto-acoustic structures are also treated. A reduction strategy based on Craig-Brampton reduction with enrichment vectors is proposed for computational efficiency to model coupling elements. Analysis of power transmission and reflection of waves in structures with defects and joints highlights the significance of the torsional mode in guided wave-based non-destructive testing in this type of system.This research work contributes not only to the understanding of wave propagation in waveguide assemblies but also offers practical strategies for accurate defect detection and localization, with potential applications in diverse engineering contexts
Madireddy, Sandeep Reddy. "Finite Element Modeling of Transverse Post-Tensioned Joints in Accelerated Bridge Construction." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1302.
Kalpathy, Venkiteswaran Venkatasubramanian. "Development of a Design Framework for Compliant Mechanisms using Pseudo-Rigid-Body Models." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1482232749828813.
Coates, Cameron Wayne. "New concepts for strength enhancement of co-cured composite single lap joints." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/12937.
Chmielowiec, Mark 1955. "MOMENT ROTATION CURVES FOR PARTIALLY RESTRAINED STEEL CONNECTIONS." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276452.
Cao, Caihua. "Damage and Failure Analysis of Co-Cured Fiber-Reinforced Composite Joints." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5298.
Abul-Hamayel, Ismat A. A. 1960. "MOMENT ROTATION CURVES FOR TOP AND SEAT CONNECTIONS (STATIC LOADING, TENSION)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/291311.
Iliopoulou, Marina. "Discrete analogues of Kakeya problems." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8068.
Tan, Xinyuan. "Co-cured composite joint strength investigation based on behavior characterization of [0/±θ/90]s family." Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26578.
Ullah, Irfan. "Caracterização da subsuperfície rasa através da curva da razão espectral H/V e da inversão conjunta das curvas de dispersão e elipticidade." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/14/14132/tde-04062018-101840/.
The destruction caused by an earthquake at a site depends on many factors like source characteristics such as magnitude, epicentral distance from the site, depth of the source, and on the geological setting of the area. The destruction caused due to the geological setting of an area is termed as site effect. To model the site effect of an area is to determine the shaking level longevity and its displacement amplification. The elastic properties (shear and compressional wave velocities, density, thickness of soil layer, etc.) of the site are required to find out by employing various geophysical procedures. The knowledge of these elastic properties help in better designing the infrastructure, which reduces the chances of destruction caused by a local geological setting due to an earthquake occurrence. This procedure is widely termed as microzonation. The most important parameters for the microzonation are the thickness of soft sediments over the seismic bedrock and its shear wave velocity profile. These two parameters are properly characterized by employing various geophysical techniques like borehole measurement, seismic reflection and seismic refraction. The conventional geophysical methods bring some hindrance to the picture such as, the drilling of a borehole and artificial seismic sources deployment for the reflection and refraction survey, which are both expensive and time consuming, difficult or even in some case impossible to implement in urbanized environment, the investigation is depth limited to few tens of meter. The methods which replaced this conventional geophysical method from the last decades or so is the analysis of Earth vibration caused by the seismic noise which is produced by both natural and cultural sources. This ambient seismic noise can be recorded with less cost and effort with good lateral coverage. Various seismic noise techniques are employed for this job; however, the one which got the most attention in recent years is the horizontal over vertical spectral ratio (H/V) technique. The H/V spectral ratio curve is a fast easy and cheap tool for the near-subsurface characterization. There are various study performed on the topic which has tried to cover almost all the aspects and problems associated with the method. Here in this study, we try to detail the aspects of this technique, which are not been evaluated fully. The different modelling procedures presented to model and physically link the H/V curve with some physical phenomenon will be discussed and its numerical result with the experimental H/V curve will be compared for a borehole test site. The peak and the shape of the H/V curve will be modelled to find its peak frequency deviation from the shear wave resonance frequency by considering different wave-field around the peak. Similarly, the shape dominancy of the H/V curve linkage will be find out. The peak frequency of the H/V curve is used to estimate the thickness-frequency relation by regression analysis. Here we will show that the dispersion curve obtained from multi-channel analysis of surface waves (MASW) can be used to estimate the velocity at one meter and the shear wave velocity increase trend with depth. These values can be used to estimate the thickness frequency relation for an area and its result will be compared with the experimentally derived thickness-frequency relationship for the same area. The sensitivity of the H/V curve shape to the subsurface velocity structure will find out for two main modelling techniques (Rayleigh wave ellipticity and diffused field based H/V curve). The different parts of the H/V curve are inverted (back modelled) to find out the part of H/V curve which is carrying the most important information about the subsurface structure. The lesson learned from all this analysis will be applied to experimental data of three different sites. The Love waves might contaminate the result of the H/V curve. Two different techniques to remove their effects will be discussed. Then, the joint inversion result of the dispersion and this Love effect removed H/V for more precisely ellipticity curve is discussed. Some new aspects of the H/V curve technique are also discussed at the end.
Chafi, Haysam. "Optimisation des efforts dans un ancrage courbe collé acier/composites." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1221/document.
Composite materials are gaining increasing interest in most of the industry sectors due to their low self-weight and their interesting physico-chemical properties. However, the use of these materials called for parallel reflections on their assembly with other materials which gave rise to the development of the structural bonding technology. This technique which allows to assemble materials of different natures by limiting, for example, the increase in the self-weight of the structure, is not fully mastered yet. For this purpose, further development on the qualification of the adhesion forces or on the understanding of durability are still necessary. This thesis addresses the problem of the optimization of adhesive bonded joints and aims in particular to study, more precisely, the use of the curvature in order to optimize the transfer of forces within the bonded joint. Two types of adhesive, one exhibiting a fragile elastic behavior and the other an elastoplastic behavior, have been studied in this work on the various analytical, numerical, and experimental aspects. We presumed that the plasticity of the adhesive appears to improve the strength of the bonded joints and; hence, shall be considered as an essential parameter in their optimization. A study of the curved geometry of the steel / composite bonded joints was then carried out, where it emerged that this geometry was effective in increasing the strength of the bonded joint and its ultimate capacity. Moreover, in order to extend the knowledge on the mechanical behavior of the curved bonded joints, and in the absence of sufficient bibliographical references on this type of bonding, we then resorted to the modeling by using the cohesive zone method to also validate the advantage of the curved geometry with respect to the plane geometry. This work finally focuses on the mechanical durability of this solution by addressing the fatigue thematic; even if additional investigations are needed, we have already found that the optimization of the joint by the use of an elastoplastic adhesive, and a curved geometry can improve the fatigue behavior of the adhesive bonded joints
Hsia, Wei-Kung 1958. "DOUBLE ANGLE CONNECTION MOMENTS (RICHARD EQUATION, PRYING FORCE, BEAM-LINE THEORY, MOMENT ROTATION CURVE)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/291892.
Špačková, Eva. "Multifunkční objekt v Českých Budějovicích." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240487.
Raigoza, Jaime Antonio. "Temporal Join Processing with Hilbert Curve Space Mapping." NSUWorks, 2013. http://nsuworks.nova.edu/gscis_etd/280.
Panneerselvam, Ashok. "A Joint Model of Longitudinal Data and Time to Event Data with Cured Fraction." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1278619003.
Olsson, Emma. "Method development for fatigue lifeprediction in welded gearset joints undertorsional loading." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86879.
Shrestha, Alina. "Fatigue Testing and Data Analysis of Welded Steel Cruciform Joints." ScholarWorks@UNO, 2013. http://scholarworks.uno.edu/td/1670.
Ahmed, Abubaker Ali Tan Tein-Min. "Initiation and growth of multiple-site damage in the riveted lap joint of a curved stiffened fuselage panel : an experimental and analytical study /." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/1560.
Lourens, Spencer. "Bias in mixtures of normal distributions and joint modeling of longitudinal and time-to-event data with monotonic change curves." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1685.
Varadarajan, Ravikumar. "On the Nature of Static and Cyclic Fracture Resistance of Ultra High Molecular Weight Polyethylenes Used in Total Joint Replacements." Case Western Reserve University School of Graduate Studies / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1164903681.
Zugna, Daniela. "Theoretical and applied issues arising from the joint modelling of longitudinal response processes and time to competing events." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425521.
Lozano, Minguez Estivaliz. "Fatigue and fracture mechanics of offshore wind turbine support structures." Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/9756.
Haag, Jefferson. "Influência da geometria do corpo de prova e do tamanho de trinca na tenacidade à fratura do aço API 5DP tool joint." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/116623.
Fracture mechanics testing using standardized specimens have a high level of restriction to plastic deformation at the crack tip, due the bending stresses and deep crack lengths. Due to the use of these specimens geometry, there is a high conservatism on the obtained results of fracture toughness testing when applied on high toughness materials. The application of specimens closely modeling to the actual stress conditions in the component under consideration are necessary to evaluate structures containing defects with low levels of constraint and small safety margins to perform appropriately the engineering critical analysis (ECA). This work aims to analyze the influence of specimen geometry and crack length on the fracture toughness of API 5DP Tool Joint steel. This study consists in the execution of fracture toughness testing on two specimen geometries (SE(B) e SE(T)) and four normalized crack lengths (a0/W = 0,40; 0,50; 0,60; and 0,70) with the unloading compliance method. Design of experiments (DOE) was applied to obtain results regarding to the main factors effects and their interactions. From triplicates of each condition, resistance curves and unique values of fracture toughness (J integral and CTOD) were calculated, and the latter result was used to calculate the analysis of variance (ANOVA). The obtained outcomes show that the specimen geometry, crack length and the interaction between these factors have significant effect on the response variables (CTOD and J integral) on a significance level of 5%. In addition, there were obtained the values of JIC e δi through the resistance curves, showing that these values do not depend on the geometry and crack length.
Nusia, Jiota. "Evaluation of Knee Ligament Injuries in Occupants of Heavy Goods Vehicles by Simulating Frontal Impacts using THUMS HBM." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-262667.
Jatheeshan, Varathananthan. "Numerical and experimental studies of cold-formed steel floor systems made of hollow flange section joists in fire." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/120145/1/Varathananthan_Jatheeshan_Thesis.pdf.
Volejník, Petr. "Lávka pro pěší." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240233.
Junková, Karolina. "Jezdecká hala v Českém Těšíně." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240357.
Ryšánek, Michal. "Posouzení životnosti svařované žebrované hřídele generátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231103.
Kuchař, Martin. "Stanovení modulu pružnosti zdiva ve směru ložné spáry." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227159.
Drexler, Martin. "Lávka pro pěší." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226916.
Grussmann, Jan. "Lávka pro pěší." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227762.
Kuchtová, Ludmila. "Pavilon v botanické zahradě v Jihlavě." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409838.
Heinrich, Stefan. "Modulbasierte Synthese ebener Koppelgetriebe unter Einbeziehung kinetischer Kenngrößen." Universitätsverlag Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A31872.
Developing nonlinear transmitting planar coupler linkages represents a domain spanning area in mechanical engineering. In recent years many efforts have been made to determine the optimal planar linkage regarding kinetic characteristics. This thesis introduces a method linking classical synthesis procedures with mechanical approaches for a dynamically balanced mechanism. For the first time, the module based analysis-synthesis-parameter-adjustment (ASPA) allows for a domain spanning simulation of complex drive assemblies based on a novel modular synthesis library. Due to an extensive documentation and detailed program flow charts it is possible to implement the library in arbitrary software environments. The exemplarily implemented library in SimulationX allows to apply the classical three- and four-position synthesis within a steady or moving reference frame of revolute or prismatic joint chains. Further, the modules return rounded link dimensions. By applying this library according to ASPA it is now possible to account for kinetic boundaries such as pendulum oscillations of joints with joint clearance or the change of mass properties during the position synthesis. Thus, a multi-criteria optimization of the remaining free synthesis parameters can be applied.
Zaghlool, Baher SalahElDeen Othman Ahmed. "Behaviour of three-dimensional concrete structures under concurrent orthogonal seismic excitations." Thesis, University of Canterbury. Civil Engineering, 2007. http://hdl.handle.net/10092/1177.
Pei-ChenTsai and 蔡沛辰. "A Development and Application of Joints for Curved Wood Box Beams." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/26246394045051806543.
國立成功大學
建築學系
102
Due to many benefits of woods, timber buildings are comfortable to dwell. More and more architects choose this material for design nowadays. To pursuit the potential of timbers, this thesis tried to design a wooden construction from structure system called the curved grid system. The thesis discussed the mechanical behavior of grid system, and then extended to wood curved grid system. It developed modularized joints which contain two parts: 1. Vault Joint (one direction curved) 2. Hyperbolic-Paraboloid Joint (Two direction curved). The purpose of these two developments is to create three-D freeform wood structure. In the case of vault joint, it could play the role of a roof structure or any other system shaped with one direction curved. To discuss the feasibility of vault joint, the thesis operated a design case, the assembly hall of Bei-Dou junior high school, and examined the mechanical behavior of it. In the case of hyperbolic-paraboloid joint, it could be the structure of 3D curved shape like a covering. In this case, it also operated a design case, the roof facility of Huei-Lai relic exhibition, and examined the mechanical behavior. For the practical development and application, in this thesis, there are several subjects related to the joint construction detail. Laboratory test still needs to be further investigated. Key words: Timber, Curved Grid System, Freeform. INTRODUCTION There are many timber buildings constructed by wood grid system, some of them are 3D curved grid. In those wood curved grid cases, they always need higher technology and lots of customized elements. For the purpose of popularity, it focused on how to make the system more simple and common. The thesis tried to design wood curved grid system with modularized joints to improve those problems. It developed one-direction curved system with the same members and connections consequently, and developed two-direction curved system focused on how to connect wood members with rotatable mechanism. As the same reason, modularized concept was required. To investigate the feasibility, the structural analysis calculated the fundamental stress and strain, then designed the dimensions of members by SAP 2000. In the case of vault joint, member’s section was 14x45 centimeters square using bolts to connect each wood member. In the case of hyperbolic-paraboloid joint, member’s section was also 14x45 centimeters square using drift-pins to connect each wood member. Due to the modularized concept, there were only two dimensions of length. After the design of joints, the thesis operated a reality case application of them. 1. The assembly hall of Bei-Dou junior high school 2. The roof facility of Huei-Lai relic exhibition MATERIALS AND METHODS The procedure of the thesis is assisted by the Rhinoceros 5 for 3D modeling, SAP 2000 for structural analysis, and 3D printer for reality modeling. 1.Rhinoceros 5: building a virtual model on the computer is convenience to image the mechanism and find out the problems quickly. 2.SAP 2000: It shows the structural details concluding dimensions, loadings, and the result of structural analysis. They are helpful to revise the design easily. 3.Makerbot Replicator 2X: the machine is lent by Architecture Department of National Cheng Kung University. The reality model is helpful to evaluate the feasibility.
(9524555), Hwa-Ching Wang. "Behavior and Design of Concrete Frame Corners: Strut-and-Tie Method Approach." Thesis, 2020.
An experimental program consisting of 24 specimens was conducted to investigate the effect of curved-bar nodes on knee joints under closing moments. An evaluation of the code-specified design expressions was included. The results demonstrate that the minimum code-specified bend radius is appropriate. The current requirements related to bond along the bar bend and clear side cover are shown to be conservative. Based on the test results, a procedure for constructing proper strut-and-tie models for closing knee joints is proposed and verified using an evaluation database consisting of 116 knee joint tests from the literature. Compared to other strength predictive methods and the code-specified strut-and-tie method, the proposed strut-and-tie method mitigates unconservativeness and delivers improved accuracy.
In addition to the experimental program and the proposed procedure, non-linear finite element analysis (FEA) using the software ATENA-3D was employed to conduct a parametric analysis as a supplement to the experimental data. Seventy-two numerical models were analyzed to further evaluate the code-specified expressions and the proposed strut-and-tie method. The FEA results are in a good agreement with the experimental observations and corroborate the conclusions from the experimental program regarding current code requirements. Moreover, the parametric analysis further supports the application of the proposed strut-and-tie methodology to knee joints under closing moments.
Henriques, José Alexandre Gouveia. "Behaviour of joints : simple and efficient steel-to-concrete joints." Doctoral thesis, 2013. http://hdl.handle.net/10316/24515.
A utilização de sistemas estruturais combinando elementos de diferente natureza, como seja paredes de betão armado com vigas e pilares metálicos ou mistos, apresenta-se como uma solução competitiva onde se retira partido da eficiência estrutural de cada tipo de elemento. Este tipo de solução requer ao projectista um conhecimento multidisciplinar onde o principal obstáculo reside na ligação entre os elementos de diferente natureza como são as ligações parede de betão armado com viga metálica/mista. Neste tipo de ligação, a principal problemática reside na ausência de configurações e modelos simplificados para dimensionamento que facilitem a avaliação das suas propriedades e a sua realização. Ao longo das últimas décadas, o desenvolvimento do método das componentes permitiu demonstrar a eficiência da metodologia na avaliação do comportamento de ligações metálicas e mistas. Consequentemente, a sua extensão a ligações estruturais aço-betão revela-se conveniente e requer a integração de “novas” componentes associadas aos modos de ruptura que despontam no elemento de betão armado. Assim, torna-se necessário a caracterização e inclusão destas componentes nos modelos globais de avaliação do comportamento da ligação. Foi com o intuito de responder a esta problemática que se desenrolou um projecto Europeu de investigação (RFCS). Neste, estudaram-se várias configurações de forma a responder às diferentes exigências estruturais. Do envolvimento do autor no projecto, desenvolveu-se a presente tese. O seu principal objectivo é a abordagem transversal às ligações estruturais aço-betão, utilizando uma configuração desenvolvida no projecto. Na versão “mais completa”, a configuração seleccionada permite realizar uma ligação entre viga mista e parede de betão armado, conferindo continuidade parcial ou total (ligação semi-continua/continua). Contudo, a flexibilidade da configuração permite a adaptação para soluções com diferentes exigências estruturais, ou seja, ligação rotulada. Na presente tese efectua-se uma abordagem sequencial, evoluindo da configuração mais simples para a mais completa, com caracterização numérica e analítica de componentes e ligações. A validação experimental é feita sempre que possível com a contribuição da literatura e dos resultados da campanha experimental do referido projecto. Assim, propõese modelos numéricos e analíticos que permitem avaliar o comportamento de uma ligação entre viga mista e parede de betão armado independentemente da idealização estrutural pretendida: rotulada, semi-continua ou continua. Por fim, é efectuado um estudo simplificado ao nível do comportamento estrutural global onde se pretende investigar as exigências estruturais a que estão submetidas as ligações estudadas. A análise considera um conjunto de pórticos planos (solução mista aço-betão) onde se incorpora o comportamento das ligações e se extraem os requisitos para diferentes estados limites.
The use of the structural systems combining members of different nature, such as reinforced concrete walls with steel/composite beams and columns, presents a competitive solution benefiting from the structural efficiency of each type of member. This type of solution requires to the designer multidisciplinary knowledge where the main obstacle lies in the joints between members of different nature, as are the reinforced concrete wall to steel/composite beam joints. In such joints, the main problem is the lack of solutions for easy execution and simplified models for evaluation of their properties. Over the past decades, the development of the component method has demonstrated the effectiveness of the methodology in assessing the behaviour of steel and composite joints. Consequently, its extension to structural steel-concrete joints is convenient and requires the integration of "new" components associated with the failures modes that develop in the reinforced concrete member. Thus, it becomes necessary to characterize and to include these components in global models for evaluation of the joint behaviour. Aiming at the study of steel-to-concrete joints, the RFCS project entitled "New market chances for steel structures by innovative fastening solutions" was developed. In the project, three joint configurations were investigated for different structural requirements. The present thesis is also the outcome of the author’s involvement in this project. Its main objective is a transversal approach to structural steel-to-concrete joints using a configuration developed within the referred project. In its “complete” version, the joint configuration provides a semi-continuous/continuous solution to connect a composite beam to a reinforced concrete wall. Though, the adaptability of the configuration allows its modification to perform under different structural requirements, as pinned joint. In this thesis a sequential approach is carried out, evolving from the simplest configuration to the “most complete”, with numerical and analytical characterization of the components, connections and joints. The experimental validation is performed whenever possible with the contribution of the results available in the literature and produced in the experimental campaign of the referred project. Thus, analytical and numerical models are proposed for characterization of the behaviour of joints between composite beam and reinforced concrete wall independently of the structural idealization: pinned, semi-continuous and continuous. Finally, at the structural level, a simplified study is performed to investigate the performance requirements of the steel-to-concrete joints. The analysis considers the structural calculation of three portal frames (mixed steel-concrete solution) which incorporate the behaviour of joints. The structural requirements for the different limit states are extracted and compared with the properties of the approached joints.
SADLER, ERIN. "PRINCIPAL COMPONENT ANALYSES OF JOINT ANGLE CURVES TO EXAMINE LIFTING TECHNIQUE." Thesis, 2010. http://hdl.handle.net/1974/5976.
Thesis (Master, Kinesiology & Health Studies) -- Queen's University, 2010-08-18 09:35:19.142
du, Tertre Antonin. "Nondestructive Evaluation of Asphalt Pavement Joints Using LWD and MASW Tests." Thesis, 2010. http://hdl.handle.net/10012/5485.
Lin, Chung-Kuang, and 林宗寬. "Electromigration in flip-chip solder joints: Effect of temperature on failure mechanism and analysis of bump resistance curves." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/3ysq4b.
國立交通大學
材料科學與工程學系所
102
Temperature-dependent electromigration failure was investigated in solder joints with Cu metallization at 126°C, 136°C, 158°C, 172°C, and 185°C. At 126°C and 136°C, voids formed at the interface of Cu6Sn5 intermetallic compounds and the solder layer. However, at temperatures equal 158°C or greater than, extensive Cu dissolution and thickening of Cu6Sn5 occurred, and few voids were observed. We proposed a model considering the flux divergence at the interface. At temperatures below 131°C, the electromigration flux leaving the interface is larger than the in-coming flux. Therefore, voids formed at the interface. Yet, the in-coming Cu electromigration flux surpasses the out-going flux at temperatures above 131°C. This model successfully explains the experimental results. This study also examines the formation of Sn-rich phases in the matrix of Cu-Sn-Ni intermetallic compounds (IMCs) after current stressing of 1.2 × 104 A/cm2 at 160°C. The Sn-rich phases were formed at the cathode end of the solder joints with Cu metallization, and this formation was attributed to the decomposition of Cu6Sn5 IMCs. When the Cu6Sn5 IMCs were transformed into Cu3Sn during current stressing, Sn atoms were released. Due to the insufficient supply of Cu atoms, Sn atoms accumulated to form Sn-rich phases among the Cu-Sn-Ni IMCs. Resistance curves play a crucial role in detecting damage of solder joints during electromigration. In general, resistance increases slowly in the beginning, and then rises abruptly in the very late stage; i.e., the resistance curve behaves concave-up. However, several recent studies have reported concave-down resistance curves in solder joints with no satisfactory explanation for the discrepancy. In this study, electromigration failure mode in Sn2.5Ag solder joints was experimentally investigated. The bump resistance curve exhibited concave-down behavior due to formation of IMCs. In contrast, the curve was concave-up when void formation dominated the failure mechanism. Finite element simulation was carried out to simulate resistance curves due to formation of IMCs and voids, respectively. The simulation results indicated that the main reason causing the concave-down curve is rapid formation of resistive Cu6Sn5 IMCs in the current-crowding region, where resistivity is nine times larger than that of Cu. Therefore, when Cu reacted with Sn to form Cu6Sn5 IMCs, the resistance increased abruptly, resulting in the concave-down resistance curve. Cu3Sn was constantly found in the solder joint after current stressing. In this study, two different types of Cu3Sn formed according to the stressing temperature of solder joints. The solder joint was under 1.30 × 104 A/cm2 current stressing test at 170°C, the solder joint could transform to layer Cu3Sn joints. However, when the stressing temperature increased to 222°C and the current density was 2.27 × 104 A/cm2, an interesting porous Cu3Sn formed at the solder joint. The formation mechanism of porous Cu3Sn, Could be explained by the phase transformation and side wall wetting phenomenon.
Arcovio, STEFANO. "FATIGUE PERFORMANCE OF A HYBRID CFRP/STEEL SPLICE DETAIL FOR MODULAR BRIDGE EXPANSION JOINTS." Thesis, 2013. http://hdl.handle.net/1974/8124.
Thesis (Master, Civil Engineering) -- Queen's University, 2013-07-24 11:28:19.728
Lai, Tzung-Chi, and 賴宗祺. "Prediction on Shear Stress-Strain Curve of Beam-Column Joint without Shear Reinforcement by Means of Softened Truss Model." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/48637099010730042354.
國立中央大學
土木工程研究所
92
This thesis comes from an idea of Hakuto’s shear degradation curve provided in 1990’s, proposing a rationally theoretical model verified basing on experimental data. The purpose of this study is to simulate the beam-column joint using a panel truss model via present concrete softened theories to find out the degradation curve of joint. Meanwhile, the analytical results of shear. Degradation on curves of beam-column joints can offer a tool for the seismic assessment of building structures. Results show, in order to predict the ultimate joint stress, the ratio of joint reinforcement have to properly reduce, restricting to the assumption of distributed joint reinforcement of the panel analysis. To obtain joint shear degradation curve, previous softened concrete models are adopted. According to data fitting, 1995’s Belarbi and Hsu softened model with Thorefeldt can simulate the behavior of beam-column joint well. However, it needs more experimental verification.
Mittal, Anshul. "Mechanical Characterization of Adhesively Bonded Jute Composite Joints under Monotonic and Cyclic Loading Conditions." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/3271.
Mittal, Anshul. "Mechanical Characterization of Adhesively Bonded Jute Composite Joints under Monotonic and Cyclic Loading Conditions." Thesis, 2017. http://hdl.handle.net/2005/3271.
zeng, yu-ling, and 曾毓玲. "The Effect of Group Buying Curve Appeal on Consumer's Intentions to Join Group Buying." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/57471714544262734032.
國立嘉義大學
行銷與流通管理研究所
95
Abstract With the development of internet netowrk, and the transparent of information casuses the marketing right to transfer, and then creat consumers with of the strong negociation price, so do group shopping beconme a kind of possible trade type. The feature of group buying is that the price will go down as the accumulated orders are increasing. However, consumer will not know the final price forecast of group buying. So, consumers only can consider whether they can join the group buying or not. As such, how to speed make the consumers join the group buying, become they concerns essential issue. At present, many group buying web provide motiviation system to attract potential consumers join it. Although this ways can efficiency attract potential consumers under the motivation system,outside the motivation system can not any appeal to consumers. And the price information which the group buying website use it do the way of appealing through the form, figure. So this resaerch expects that presents the way through another kind of price curve, let consumers pass the result on vision, the consciousness reaches prices to drop fast, and can consumers to predict the final price, reduce congitive effort, promoting the memory and attitugde of the information of the price, than can raise the consumers accede to the intetion of the group buying. The experimet method was applied this study. In order to improve the research validly and reliability the questionnaire was used to collect the quantitative data. Findings showed that the consumers’ predict the final price、congitive effort、attitude and memory of the advertisement significantly ( p<0.05 ) impacted on price curve. Further, both memory of the advertisement and congitive effort significantly( p<0.05 ). That is, via increasing the consumers’ memory of the advertisement and reduce their congitive effort, raise their attitude of the advertisement. It has proved that if the consumer has the good attitude toward to the price curve and this price cureve can effectively help to predict the final price, then the consumers’s joint of intention in group buying will uprise relatively. The statistics shows that :through the dynamic price curve can effectively the consumer’s joint of intention in group buying. Managerial implications of how B2C Website can sort out the problems of the price information boring not attract potential consumers joint the group buying.
Lewis, Barbara Jane. "To determine the immediate effect of sacroiliac and lumbar manipulation on quadriceps femoris and hamstring torque ratios in the contralateral limb in patients suffering from mechanical low back pain." Thesis, 2005. http://hdl.handle.net/10321/199.
Low back pain has been shown to be associated with inhibition of the lower limb musculature. This inhibition is called arthrogenic muscle inhibition (AMI). Sacroiliac joint dysfunction has been linked with AMI of the ipsilateral and contralateral quadriceps and hamstring muscles. Sacroiliac manipulation has been shown to significantly reduce ipsilateral AMI, however no studies have been conducted to illustrate the effect of sacroiliac manipulation on contralateral AMI. Neither have their been studies to show the presence or extent of spinal dysfunction between the levels of L2-L5 and its significance on muscle inhibition in the quadriceps and hamstring muscles, nor the effect of manipulation of these levels on AMI of the quadriceps and hamstring muscles. The purpose of this study was therefore to determine whether spinal manipulation has an effect on AMI of the contralateral limb as well as that of the ipsilateral limb.
Santos, Maria Paula Correia Pedroso dos. "Divesture/acquisition analysis: PT/Telefónica/VIVO case study." Master's thesis, 2011. http://hdl.handle.net/10071/4324.
O principal objectivo desta tese de mestrado é avaliar o impacto dos eventos/anúncios na capitalização bolsista das empresas de forma a testar a eficiência dos mercados. As aquisições, fusões e desinvestimentos são estratégias levadas a cabo pelas empresas de forma a ajustarem-se ás mudanças económicas e políticas para assim desenvolverem novas capacidades que lhes permitam aproveitar as oportunidades que existem na envolvente. Neste estudo analisa-se o impacto que a venda da participação da PT na Vivo, á Telefónica, teve na capitalização bolsista de ambas as empresas. Adicionalmente, é também aplicada a metodologia do estudo de eventos sugerida por Mackinlay et al. (1997). Esta metodologia tem como objectivo medir o impacto de um evento/anúncio específico na capitalização bolsista das empresas, estando desta forma a testar a eficiência dos mercados de capitais. Neste estudo detectaram-se rentabilidades anómalas em todos os eventos em análise, com especial incidência no evento 2 e 3, que correspondem respectivamente, ao dia 1 de Junho de 2010 (dia em que a Telefónica lançou a segunda oferta com o objectivo de adquirir a participação detida pela PT na Vivo pelo montante de €6.5 bn) e ao dia 30 de Junho de 2010 (dia em que ocorreu a Assembleia Geral de Accionistas da PT em que foi usada a Golden Share por parte do Governo Português de forma a bloquear a operação).
SAIYAR, MASOUMEH. "BEHAVIOUR OF BURIED PIPELINES SUBJECT TO NORMAL FAULTING." Thesis, 2011. http://hdl.handle.net/1974/6302.
One of the most severe hazards for buried pipelines, which are sometimes referred to as lifelines due to their essential role in delivering vital resources, is the hazard due to Permanent Ground Deformation (PGD). Earthquake induced PGD can be caused by surface faulting, landslides and seismic settlement. In this thesis, the behaviour of buried pipelines subject to normal faulting has been experimentally investigated through a series of centrifuge tests performed on both continuous and jointed pipelines. Both pipe and soil displacements were measured using image analysis. Signal processing techniques were then developed to filter this data so as to enable the calculation of curvature and other aspects of the response from the observed pipe deformations. First, a series of centrifuge tests was conducted on continuous pipelines of varying materials, representing a wide range of pipe stiffness relative to the soil and investigating the effect of pipe stiffness relative to the soil on soil-pipe interaction. The experimentally derived p-y curves at different locations along the pipe were compared to the recommended soil-pipe interaction models in the relevant guidelines. These p-y curves showed that the central shearing region was not captured well with independent soil springs. The response of the pipelines predicted by the ALA (2001) guideline, however, was shown to match the experimental data within 50%. Two new simplified design approaches were then developed. The first features calculations based on simplified pressure distributions. The second featured peak curvature normalized using a characteristic length, ipipe, the distance from peak to zero moment. A series of centrifuge tests using brittle pipes was also performed. The pipes were buried at three different depths, and the post-failure fracture angle of the pipe was measured to be used as an input for design of liners. Based on the experimental data, a computationally efficient approach was developed to estimate the initial fracture angle which occurs immediately after the pipe breaks. The last series of centrifuge tests was conducted on jointed pipelines with five different joint stiffnesses to investigate the flexural behaviour of jointed pipelines under normal faulting. Based on the observed pipe response, a simplified kinematic model was proposed to estimate the maximum joint rotation for a given geometry, pipe segment length, and the magnitude of the imposed ground displacement.
Ph.D