Rozprawy doktorskie na temat „Flexural analysis”
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Soranakom, Chote, i Barzin Mobasher. "Flexural Analysis and Design of Textile Reinforced Concrete". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1244046537373-61938.
Pełny tekst źródłaZhong, Min. "Dynamic analysis of cables with variable flexural rigidity". Thesis, University of Hawaii at Manoa, 2003. http://hdl.handle.net/10125/6990.
Pełny tekst źródłaBian, Jian. "Ultimate flexural limit states analysis of prestressed concrete sleeper". Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/63660/1/Jian_Bian_Thesis.pdf.
Pełny tekst źródłaGiroux, Cynthia. "Analysis of the flexural behaviour of a fibreglass composite seawall". Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30784.
Pełny tekst źródłaA novel testing method was developed to simultaneously determine the flexural rigidity (EI) and shear rigidity (kAG) of the panel using Timoshenko's beam theory. Three- and four-point bending tests were performed on six different span lengths and the results were self-consistent from the two different tests. (Abstract shortened by UMI.)
Naji, Behnam. "Flexural Analysis and Composite Behavior of Precast Concrete Sandwich Panel". University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1355331734.
Pełny tekst źródłaKurniawan, Cyrilus Winatama. "Flexural behaviour and design of the new LiteSteel beams". Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16674/1/Cyrilus_Kurniawan_Thesis.pdf.
Pełny tekst źródłaKurniawan, Cyrilus Winatama. "Flexural behaviour and design of the new LiteSteel beams". Queensland University of Technology, 2007. http://eprints.qut.edu.au/16674/.
Pełny tekst źródłaCAMPOS, CLAUDIA MARIA DE OLIVEIRA. "ANALYSIS OF THE FLEXURAL BEHAVIOR OF BEAMS PRESTRESSED WITH EXTERNAL TENDONS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1874@1.
Pełny tekst źródłaBRITISH COUNCIL
A protensão de estruturas de concreto com cabos externos já é uma prática comum em vários países e, tem sido empregada tanto na recuperação e reforço de estruturas existentes quanto na concepção de novas estruturas. Entre algumas vantagens estão a redução do peso da estrutura,simplicidade no traçado dos cabos e melhores condições de concretagem. A protensão externa pode ser feita com cabos de aço ou com cabos sintéticos. Estes últimos são constituídos de fibras de alta resistência e excelente resistência à corrosão. O cálculo da resistência das vigas protendidas com cabos não aderentes é mais complexo do que o caso de cabos aderentes, pois a variação de tensão é função da integral das deformações da viga ao longo do traçado do cabo. Este trabalho apresenta um modelo rígido-plástico simplificado para estimar a variação da força em cabos de protensão não aderentes, para estágios de carregamento onde ocorrem deformações plásticas nos materiais, considerando que todas as rotações estejam concentradas em uma rótula plástica. O modelo leva em consideração a dependência da variação da força em cabos de protensão com o comportamento geral da estrutura, bem como a influência da resistência do concreto, da taxa de armadura na seção e dos deslizamentos que ocorrem ao longo da armadura não aderente. A eficiência deste tipo de análise é verificada por meio de uma boa concordância entre resultados analíticos e experimentais, desde que se tenha uma boa estimativa da capacidade de rotação e/ou posição relativa da linha neutra na ruptura. Apresenta-se um estudo paramétrico, sobre o comportamento à flexão de vigas protendidas com cabos externos, utilizando o modelo computacional de Campos (1993). A análise é utilizada para enfatizar as principais implicações do emprego de cabos externos de diferentes módulos de elasticidade. Estabeleceu-se também, uma relação entre a capacidade de rotação da seção e posição relativa da linha neutra, com o objetivo de facilitar a determinação da variação de força em cabos não aderentes quando o modelo rígido-plástico simplificado é empregado. Verificou-se uma boa concordância entre resultados analíticos e experimentais.
Beams prestressed with external tendons have a number of attractions for engineers. They allow a reduction in weight, since concrete is not provided merely to act as cover to tendon or duct; they allow the tendons to be inspected for signs of corrosion and tendons can be replaced or retensioned if necessary. External prestressing is also an ideal application of tendons made of new materials, such as aramids; since the tendons are brittle, it is necessary to avoid the strains concentrations that occur at crack locations with bonded tendons. Since aramids fibres are non-corrodable , there is no problem about the lack of alkaline environment. The main difference in behaviour between bonded and unbonded tendons is that the deflected shape of the unbonded tendon is not the same of the beam. The force change in unbonded tendons depends on the overall geometry of the beam. This work presents a rigid plastic analysis for predicting the force in unbonded tendons , which takes into account the overall geometry of the beam, concrete strenght, reinforment index, as well as the effects of the friction at deflector points. The method is validated with a good agrement with experimental results, provided that a good aproximation of the rotational capacity of a critical section and/or the relative position of the neutral axis are known. A numerical parametrical study of the flexural resistance of concrete beams prestressed with external tendons is carried out, with particular attention paid to those beams prestressed with aramid tendons. This study used a computer program developed by Campos(1993) based on the finite element method for the analysis of concrete structures prestressed with both bonded and unbonded tendons , including external prestressing. A relationship between the rotational capacity of a critical section and the relative position of the neutral axis was stablished. The usage of this relationship together with the rigid plastic model lead to a good agreement with experimental results. Beams prestressed with external tendons have a number of attractions for engineers. They allow a reduction in weight, since concrete is not provided merely to act as cover to tendon or duct; they allow the tendons to be inspected for signs of corrosion and tendons can be replaced or retensioned if necessary. External prestressing is also an ideal application of tendons made of new materials, such as aramids; since the tendons are brittle, it is necessary to avoid the strains concentrations that occur at crack locations with bonded tendons. Since aramids fibres are non-corrodable , there is no problem about the lack of alkaline environment. The main difference in behaviour between bonded and unbonded tendons is that the deflected shape of the unbonded tendon is not the same of the beam. The force change in unbonded tendons depends on the overall geometry of the beam. This work presents a rigid plastic analysis for predicting the force in unbonded tendons , which takes into account the overall geometry of the beam, concrete strenght, reinforment index, as well as the effects of the friction at deflector points. The method is validated with a good agrement with experimental results, provided that a good aproximation of the rotational capacity of a critical section and/or the relative position of the neutral axis are known. A numerical parametrical study of the flexural resistance of concrete beams prestressed with external tendons is carried out, with particular attention paid to those beams prestressed with aramid tendons. This study used a computer program developed by Campos(1993) based on the finite element method for the analysis of concrete structures prestressed with both bonded and unbonded tendons , including external prestressing. A relationship between the rotational capacity of a critical section and the relative position of the neutral axis was stablished. The usage of this relatio
La protensión de extructuras de concreto con cabos externos es ya una práctica común en varios países y, ha sido empleada tanto en la recuperación y refuerzo de extructuras existentes cuanto en la concepción de nuevas extructuras. Entre algunas ventajas están la reducción del peso de la extructura,simplicidad en el trazado de los cables y mejores condiciones para el concretaje. La protensión externa puede ser hecha con cables de acero o con cables sintéticos. Estos últimos están constituídos de fibras de alta resistencia y excelente resistencia a la corrosión. El cálculo de la resistencia de las vigas protendidas con cables no adherentes es más complejo del que el caso de cables adherentes, pués la variación de tensión es función de la integral de las deformaciones de la viga a lo largo del trazado del cable. Este trabajo presenta un modelo rígido-plástico simplificado para estimar la variación de la fuerza en cables de protensión no adherentes, para estadíos de carregamento donde ocurren deformaciones plásticas en los materiales, considerando que todas las rotaciones esten concentradas en una rótula plástica. El modelo lleva en consideración la dependencia de la variación de la fuerza en cables de protensión con el comportamiento general de la extructura, así como la influencia de la resistencia del concreto, de la tasa de armadura en la sección y de los deslizamientos que ocurren a lo largo de la armadura no adherente. La eficiencia de este tipo de análisis se verifica por meio de una buena concordancia entre resultados analíticos y experimentales, desde que se tenga uma buena estimativa de la capacidad de rotación y/o posición relativa de la línea neutra en la ruptura. Se presenta un estudio paramétrico, sobre el comportamiento a la flexión de vigas protendidas con cables externos, utilizando el modelo computacional de Campos (1993). El análisis se utiliza para enfatizar las principales implicaciones del uso de cables externos de diferentes módulos de elasticidad. Se establece también, una relación entre la capacidad de rotación de la sección y posición relativa de la línea neutra, con el objetivo de facilitar la determinación de la variación de fuerza en cables no adherentes cuando se emplea el modelo rígido-plástico simplificado. Se erificó una buena concordancia entre resultados analíticos y experimentales.
Brahmachari, Koushik. "Connection and flexural behaviour of steel RHS filled with high strength concrete /". View thesis, 1997. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030708.160244/index.html.
Pełny tekst źródła"Thesis presented for the Degree of Doctor of Philosophy, School of Construction and Building Sciences, Faculty of Science, Technology and Agriculture, University of Western Sydney, Hawkesbury, December 1997.
Tabassum, Javeria, i javeriaajaz@yahoo co in. "Analysis of current methods of flexural design for high strength concrete beams". RMIT University. Civil, Environmental & Chemical Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080725.143153.
Pełny tekst źródłaDayou, Jedol. "Global control of flexural vibration of a one dimensional structure using tuneable vibration neutralisers". Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310842.
Pełny tekst źródłaAzzam, Mai Ahmed. "Flexural strength comparison of monolayer resin composite to bilayer resin/ liner composite". Thesis, Connect to resource online, 2009. http://hdl.handle.net/1805/2077.
Pełny tekst źródłaTitle from PDF t. p. (viewed Feb. 5, 2010) Advisor(s): Jeffrey A. Platt, Chair of the Research Committee, Joseph Legan, Carl J. Andres, David Brown, Burak Taskonak . Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 45-52).
Sathiraju, Venkata Sai Surya Praneeth. "Lateral Stability Analysis of Precast Prestressed Bridge Girders During All Phases of Construction". University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252005286553.
Pełny tekst źródłaMiàs, Oller Cristina. "Analysis of time-dependent flexural behaviour of concrete members reinforced with fibre reinforced polymer bar". Doctoral thesis, Universitat de Girona, 2012. http://hdl.handle.net/10803/96914.
Pełny tekst źródłaEn aquest treball, es presenta una nova metodologia per a la determinació de fletxes diferides degudes als efectes de la fluència i la retracció del formigó. La metodologia presentada es basa en coeficients multiplicadors, essent així un mètode directe i simple, apte per ser utilitzar en el disseny. Addicionalment, l’estudi presenta els resultats d’una campanya experimental realitzada en dues etapes, on bigues armades amb barres de material compost han estat sotmeses a càrregues a llarg termini. S’han considerat diferents quanties de reforç, resistències de formigó i nivells de càrrega. Per tal de comparar-ne els resultats, també s’han assajat bigues armades amb barres d’acer. Els resultats experimentals han estat analitzats i comparats amb els models de predicció més significatius, així com amb la metodologia desenvolupada i presentada en aquest estudi.
Jenkins, Morgan Christen. "Fresh Mix Properties and Flexural Analysis with Digital Image Correlation of Additively Manufactured Cementitious Materials". Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/96560.
Pełny tekst źródłaMaster of Science
Recently, additive manufacturing (AM), or "3D printing," is expanding into civil infrastructure applications, specifically cementitious materials such as mortar and concrete. Understanding and predicting the behavior of the materials when using this new technique is vital for quality assurance and quality control (QA/QC). However, standard test methods have yet to be established for this new construction technique. This thesis aims to use existing testing standards to characterize AM cementitious composites and to gather better information on how to tackle the challenges of printing with these materials. In this work, properties before and after the materials hardened were studied by adapting current testing standards. Specifically, this project applied existing testing standards for fresh mix mortars to measure setting time, flow, and early compressive strength. These properties can serve as indicators of specific printing requirements. The fresh mix properties were studied for 12 different mortar mixes to show the effect of moisture content, absorption, and sand type. The results suggest that there was less variability in the properties when the moisture condition and type of the aggregate was accounted. The fresh mix materials were printed in a layer-by-layer process and then hardened in place. The effects of the layers were explored by performing flexure tests using four orientations with respect to how the load was applied to the layers. The observed difference in behavior for the different orientations was supported by digital image correlation data. In addition, an analysis of the effect defects had on the performance was included. Understanding how defects impacted performance can be valuable for effectively designing 3D printed structures in the future. The results of this thesis confirm that existing testing standards for mortars can be adapted and applied to AM cementitious materials for QA/QC. It is recommended that mixtures used in 3D printing of cementitious materials should account for the moisture condition of the aggregate to improve the predictability of the fresh and early-age properties. For the hardened properties, it is recommended that the design is a function of loading orientation due to the difference in behavior for the different orientations of the material.
Anapayan, Tharmarajah. "Flexural behaviour and design of hollow flange steel beams". Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/36210/1/Tharmarajah_Anapayan_Thesis.pdf.
Pełny tekst źródłaLo, Patrick Kar-Leung. "Comparison of theory and experiment for flexural-torsional buckling of laminated composite columns". Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50051.
Pełny tekst źródłaMaster of Science
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Young, Peter Aerospace Civil & Mechanical Engineering Australian Defence Force Academy UNSW. "Fracture analysis of glass microsphere filled epoxy resin syntactic foam". Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace, Civil and Mechanical Engineering, 2008. http://handle.unsw.edu.au/1959.4/38657.
Pełny tekst źródłaStirling, Bradley James. "Flexural Behavior of Interlocking Compressed Earth Block Shear Walls Subjected to In-Plane Loading". DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/593.
Pełny tekst źródłaLopez, Jay. "Optimizing the Mechanical Characteristics of Bamboo to Improve the Flexural Behavior for Biocomposite Structural Application". DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/902.
Pełny tekst źródłaPaul, Ewart D. "Micro-mechanical predictive modelling as an aid to CAD based analysis of composite sporting equipment". The University of Waikato, 2008. http://hdl.handle.net/10289/2509.
Pełny tekst źródłaBrahmachari, Koushik. "Connection and flexural behaviour of steel RHS filled with high strength concrete". Thesis, View thesis, 1997. http://handle.uws.edu.au:8081/1959.7/526.
Pełny tekst źródłaMujagic, Ubejd. "Design and Behavior of Composite Steel-Concrete Flexural Members with a Focus on Shear Connectors". Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/26745.
Pełny tekst źródłaPh. D.
Du, Qixin. "Finite Element Modelling of Steel/Concrete Bond for Corroded Reinforcement". Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33465.
Pełny tekst źródłaShaabin, Maram. "The effect of inhibitor and initiator concentration on degree of conversion, flexural strength and polymerization shrinkage". Connect to resource online, 2009. http://hdl.handle.net/1805/2113.
Pełny tekst źródłaTitle from PDF t. p. (viewed Mar. 30, 2010) Advisor(s): Gabriel Tien-Min Chu, Chair of the Research Committee, Melvin R. Lund, Bruce A. Matis, Carlos Gonzalez-Cabezas, Michael A. Cochran. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 79-87).
Dearden, Jason Lon. "Design and Analysis of Two Compliant Mechanism Designs for Use in Minimally Invasive Surgical Instruments". BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/7383.
Pełny tekst źródłaWanniarachchi, Somadasa. "Flexural behaviour and design of cold-formed steel beams with rectangular hollow flanges". Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/29810/1/Somadasa_Wanniarachchi_Thesis.pdf.
Pełny tekst źródłaWanniarachchi, Somadasa. "Flexural behaviour and design of cold-formed steel beams with rectangular hollow flanges". Queensland University of Technology, 2005. http://eprints.qut.edu.au/29810/.
Pełny tekst źródłaJavanshir, Hasbestan Jaber. "Free Flexural (or Bending) Vibration Analysis Of Certain Of Stiffened Composite Plates Or Panels In Flight Vehicle Structures". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611489/index.pdf.
Pełny tekst źródłaFree Flexural (or Bending) Vibrations of Stiffened Plates or Panels&rdquo
are investigated in detail. Two different Groups of &ldquo
Stiffened Plates&rdquo
will be considered. In the first group, the &ldquo
Type 4&rdquo
and the &ldquo
Type 6&rdquo
of &ldquo
Group I&rdquo
of the &ldquo
Integrally-Stiffened and/or Stepped-Thickness Plate or Panel Systems&rdquo
are theoretically analyzed and numerically solved by making use of the &ldquo
Mindlin Plate Theory&rdquo
. Here, the natural frequencies and the corresponding mode shapes, up to the sixth mode, are obtained for each &ldquo
Dynamic System&rdquo
. Some important parametric studies are also presented for each case. In the second group, the &ldquo
Class 2&rdquo
and the &ldquo
Class 3&rdquo
of the &ldquo
Bonded and Stiffened Plate or Panel Systems&rdquo
are also analyzed and solved in terms of the natural frequencies with their corresponding mode shapes. In this case, the &ldquo
Plate Assembly&rdquo
is constructed by bonding &ldquo
Stiffening Plate Strips&rdquo
to a &ldquo
Base Plate or Panel&rdquo
by dissimilar relatively thin adhesive layers. This is done with the purpose of reinforcing the &ldquo
Base Plate or Panel&rdquo
by these &ldquo
Stiffening Strips&rdquo
in the appropriate locations, so that the &ldquo
Base Plate or Panel&rdquo
will exhibit satisfactory dynamic response. The forementioned &ldquo
Bonded and Stiffened Systems&rdquo
may also be used to repair a damaged (or rather cracked) &ldquo
Base Plate or Panel&rdquo
. Here in the analysis, the &ldquo
Base Plate or Panel&rdquo
, the &ldquo
Stiffening Plate Strips&rdquo
as well as the in- between &ldquo
adhesive layers&rdquo
are assumed to be linearly elastic continua. They are assumed to be dissimilar &ldquo
Orthotropic Mindlin Plates&rdquo
. Therefore, the effects of shear deformations and rotary moments of inertia are considered in the theoretical formulation. In each case of the &ldquo
Group I&rdquo
and &ldquo
Group II&rdquo
problems, the &ldquo
Governing System of Dynamic Equations&rdquo
for every problem is reduced to the &ldquo
First Order Ordinary Differential Equations&rdquo
. In other words the &ldquo
Free Vibrations Problem&rdquo
, in both cases, is an &ldquo
Initial and Boundary Value Problem&rdquo
is reduced to a &ldquo
Two- Point or Multi-Point Boundary Value Problem&rdquo
by using the present &ldquo
Solution Technique&rdquo
. For this purpose, these &ldquo
Governing Equations&rdquo
are expressed in &ldquo
compact forms&rdquo
or &ldquo
state vector&rdquo
forms. These equations are numerically integrated by the so-called &ldquo
Modified Transfer Matrix Method (MTMM) (with Interpolation Polynomials)&rdquo
. In the numerical results, the mode shapes together with their corresponding non-dimensional natural frequencies are presented up to the sixth mode and for various sets of &ldquo
Boundary Conditions&rdquo
for each structural &ldquo
System&rdquo
. The effects of several important parameters on the natural frequencies of the aforementioned &ldquo
Systems&rdquo
are also investigated and are graphically presented for each &ldquo
Stiffened and Stiffened and Bonded Plate or Panel System&rdquo
. Additionally, in the case of the &ldquo
Bonded and Stiffened System&rdquo
, the significant effects of the &ldquo
adhesive material properties&rdquo
(i.e. the &ldquo
Hard&rdquo
adhesive and the &ldquo
Soft&rdquo
adhesive cases) on the dynamic response of the &ldquo
plate assembly&rdquo
are also presented.
Westwood, Mitchell (Mitchell T. ). "Creation and validation of a numerical model for the analysis of bending patterns of flexural laparoscopic grasper fingers". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68929.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (p. 19).
A series of analytical models are created to predict the bending behavior of novel flexural laparoscopic fingers. These models predict behavior and stresses as a function of finger geometry and actuation force. A model is first created for a blade flexure concept and is used to prove the concept impractical, eliminating unnecessary fabrication and testing. Another model is created for an initially curved flexure concept and predicts the success of the model. These fingers are prototyped and tested, confirming the analytical model. The same model predicts the benefits of a modified initially curved flexure and is the basis for the decision to move forward with that concept.
by Mitchell Westwood.
S.B.
Schaub, Kellie M. "The effect of a novel photoinitiator system (RAP) on dental resin composite's flexural strength, polymerization stress, and degree of conversion". Connect to resource online, 2009. http://hdl.handle.net/1805/2080.
Pełny tekst źródłaTitle from PDF t. p. (viewed Feb. 9, 2010) Advisor(s): Jeffrey A. Platt, Chair of the Research Committee, Carl J. Andres, Suteena Hovijitra, David Brown, John A. Levon. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 56-59).
Pokharel, Narayan. "Behaviour and design of sandwich panels subject to local buckling and flexural wrinkling effects". Thesis, Queensland University of Technology, 2003. https://eprints.qut.edu.au/15890/1/Narayan_Pokharel_Thesis.pdf.
Pełny tekst źródłaPokharel, Narayan. "Behaviour and Design of Sandwich Panels Subject to Local Buckling and Flexural Wrinkling Effects". Queensland University of Technology, 2003. http://eprints.qut.edu.au/15890/.
Pełny tekst źródłaRučinskas, Artūras. "Comparative analysis of stress-strain calculation methods and algorithms for concrete members reinforced with FRP re-bars". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110620_141822-28189.
Pełny tekst źródłaBaigiamąjį magistro darbą sudaro trys pagrindinės dalys. Pirmajame skyriuje pateikiama literatūros apžvalga, kurioje nagrinėjamos temos susijusios su pluoštinės armatūros panaudojimu lenkiamiems betoniniams elementams. Apžvelgiamos tokių elementų panaudojimo galimybės, privalumai ir trūkumai, deformacijų skaičiavimo metodai bei matematiniai modeliai. Antrajame skyriuje nagrinėjama surinkta polimerine armatūra armuotų sijų eksperimentinių duomenų imtis. Siekiant įvertinti skirtingų skaičiavimo metodų patikimumą ir pritaikomumą ne plienine armatūra armuotiems elementams, atliekama lyginamoji statistinė analizė. Jos metu įvertinama armavimo procento, apkrovimo lygio bei pluoštinės armatūros tamprumo modulio įtaka. Trečiojoje darbo dalyje surinktai eksperimentinių duomenų imčiai pritaikytas VGTU Tiltų ir Specialiųjų Statinių Katedroje sukurtas Diskrečiųjų plyšių modelis. Gautos priklausomybės palygintos su kitų skaičiavimo normų rezultatais bei eksperimentiniais duomenimis. Gauti rezultatai parodė, kad pritaikius tikslesnius praslydimo bei armatūros ir betono sąveikos ruožuose tarp plyšių modelius, diskrečiųjų plyšių modelis gali būti sėkmingai taikomas polimerine armatūra armuotų elementų elgsenai prognozuoti.
Rider, Kodi A. "The Effect of a Low-Velocity Impact on the Flexural Strength and Dynamic Response of Composite Sandwiches with Damage Arrestment Devices". DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/842.
Pełny tekst źródłaTan, Chor Suan. "Theoretical analysis of the flexural strength and behaviour of unbonded partially prestressed concrete beams and slabs with and without bonded reinforcement". Thesis, University of Canterbury. Department of Civil Engineering, 1989. http://hdl.handle.net/10092/2450.
Pełny tekst źródłaCil, Kursad. "Free Flexural (or Bending) Vibrations Analysis Of Doubly Stiffened, Composite, Orthotropic And/or Isotropic Base Plates And Panels (in Aero-structural Systems)". Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/2/1062256/index.pdf.
Pełny tekst źródłas Solutions can be applied in that direction. Thus, the transverse shear deformations and the rotary moments of inertia of plates are included in the formulation. The very thin, yet elastic deformable adhesive layers are considered as continua with transverse normal and shear stresses. The damping effects in the plates and the adhesive layers are neglected. The sets of the systems of equations of the Mindlin Plate Theory are reduced to a set of the Governing System of First Order Ordinary Differential Equations in the state vector form. The sets of the Governing System for each Main PROBLEM constitute a Two-Point Boundary Value Problem in the y-direction which is taken along the length of the plates. Then, the system is solved by the Modified Transfer Matrix Method (with Interpolation Polynomials and/or Chebyshev Polynomials)which is a relatively semi-analytical and numerical technique. The numerical results and important parametric studies of the natural modes and the corresponding frequencies of the composite system are presented.
Regmi, Bagale Bibek Regmi. "Fiber Reinforced Polymer Strengthening of Steel Beams– A Numerical and Analytical Study". University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1575821093025102.
Pełny tekst źródłaMohamed, Ahmed Abdeldayem. "Behavior, strength and flexural stiffness of circular concrete columns reinforced with FRP bars and spirals/hoops under eccentric loading". Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/11406.
Pełny tekst źródłaLa détérioration des structures en béton armé avec des barres d’armature d’acier peut être observée quotidiennement dans les régions à climat agressif. Le renforcement interne en polymères renforcés de fibres (PRF) a démontré sa faisabilité grâce à différents éléments structuraux en génie civil. Les lignes directrices actuelles pour les structures en béton armé de PRF en Amérique du Nord et en Europe n'ont pas encore gérées les sections soumises à des efforts axiaux excentrique, en raison du manque de recherches et d'expériences. Cette recherche permet d’augmenter la base de données expérimentales ainsi établir des analyses approfondies et des recommandations de conception pour les colonnes circulaires en béton armé complètement renforcées de PRF (barres et spirales). Des grandeur-nature colonnes ont été testées sous charge monotone avec différents niveaux d'excentricité. Les variables de test comprenaient le rapport excentricité / diamètre (e/D) ; le type de renfort (PRFV et PRFC comparativement à l’acier); la résistance du béton en compression; le taux d’armature longitudinal et transversal; et la configuration de l’armature de confinement. Tous les échantillons mesuraient 305 mm de diamètre et 1500 mm de hauteur. Les résultats des tests ont indiqué que les spécimens renforcés avec des PRF de verre ou des PRF de carbone atteignaient leur résistance maximale sans endommager les barres d’armature. Des deux types de renforcement, les spécimens de PRFCCFRP se comportaient de manière très similaire à leurs homologues en acier et atteignaient presque les mêmes résistances axiales. Cependant, les spécimens avec renforcement en PRFV ont présenté une rigidité réduite et des forces axiales nominales inférieures à celles de leurs homologues en acier ou en PRFC. Le mode de rupture des spécimens de PRFC et de PRFV a été dominé par l’écrasement du béton à de faibles niveaux d'excentricité (rapports e/D de 8,2% et 16,4%). Les résultats ont révélé que les barres de PRFV ont développé des niveaux élevés de déformations et de contraintes sur les faces en compression et en tension et, par conséquent, les spécimens de PRFVC pourraient supporter une charge axiale constante après la résistance ultime pendant un certain temps jusqu'à la limite de la rupture en compression du béton du noyau à des niveaux supérieurs d'excentricité (rapport e/D de 8,2% et 16,4%), ce qui contribue à retarder la dégradation. À ces niveaux, une rupture en tension a été initiée dans les spécimens de PRFV résultant à de grandes déformations axiales et latérales et des fissures du côté de la face en tension jusqu'à ce que la rupture en compression du béton. La rupture des spécimens de PRFC à des niveaux supérieurs d'excentricité (rapport e/D de 8,2% et 16,4%) a été caractérisé comme étant en compression du béton dans laquelle il s'est déroulé de manière moins fragile. D'autre part, cette recherche comprenait également différentes études pour analyser les résultats des tests, évaluer l'efficacité des barres d'armature et fournir des recommandations pour l'analyse et la conception. Il a donc été indiqué que les capacités axiales et de flexion des spécimens en PRF testées pourraient être raisonnablement prédites en utilisant une analyse en section plane, en utilisant les paramètres du bloc de contrainte rectangulaire équivalent (BCRE) donnés par l'ACI 440.1R-15 ou la CSA S806- 12. Toutes les prédictions ont sous-estimé la résistance réelle avec des niveaux de variabilité conservateur entre 1,05 et 1,25 pour les spécimens de PRFC et entre 1,20 et 1,40 pour les spécimens de PRFC. Ces niveaux ont été nettement réduits à des limites critiques dans les spécimens avec des bétons à haute résistance. Un examen approfondi a été effectué sur les paramètres du BCRE disponibles dans les normes et les directives de conception actuelles en acier et en PRF. Les expressions modifiées du BCRE fournies dans ACI 440.1R-15 et CSA S806-12 ont été développées. Les résultats indiquent une bonne corrélation entre les valeurs de résistance prédites et mesurées avec des niveaux accrus de conservatisme. La contribution de la résistance à la compression du renforcement en PRF a été soigneusement examinée et discutée. Le taux d’armature minimum de PRFV et de PRFC pour éviter la rupture de l'armature ont été largement examinés. Enfin, la rigidité en flexion (EI) des spécimens testés a été déterminée de manière analytique et comparée aux expressions disponibles dans la littérature en utilisant les réponses expérimentales et analytiques M-ψ. Les expressions modifiées de la rigidité en flexion EI apportées dans l’ACI 440.1R ont été développées et validées.
Zhang, Xuesong, i n/a. "Punching Shear Failure Analysis of Reinforced Concrete Flat Plates Using Simplified Ust Failure Criterion". Griffith University. School of Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20051104.153239.
Pełny tekst źródłaZhang, Xuesong. "Punching Shear Failure Analysis of Reinforced Concrete Flat Plates Using Simplified Ust Failure Criterion". Thesis, Griffith University, 2003. http://hdl.handle.net/10072/365777.
Pełny tekst źródłaThesis (Masters)
Master of Philosophy (MPhil)
School of Engineering
Full Text
Okada, Cristina Yuri. "Efeito do envelhecimento por ciclagem mecânica ou ciclagem em autoclave na resistência à flexão de cerâmicas odontológicas". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/23/23140/tde-26022010-084357/.
Pełny tekst źródłaThe aims of this study were: to perform a microestrutural analysis of dental ceramics and correlate the results with the flexural strength obtained; to evaluate two aging process (mechanical cycling and autoclave cycling) on the flexural strength of the materials and to evaluate the specimen configuration (bar or disc) on the flexural strength of mechanical cycling aged specimens. The five ceramics tested were: yttria-stabilized zirconia (YZ), polycrystalline alumina (AL), glass-infiltrated alumina/zirconia reinforced (ICZ) and two dental porcelains (VM7 and VM9). Bars (2 x 4 x 16 mm) and discs (12 mm x 2 mm) were produced according to the manufactures instructions. Density was obtained by Arquimedes method and the elastics constants were obtained by ultrasonic pulse-echo method. Optical and Scanning Electron Microscope were used to determine the fraction and size of both pores and particles while the chemical composition was obtained by EDS. Aging effect on flexural strength after mechanical or autoclave cycling was evaluated on bar specimens and compared to a control group, which was not cycled. The specimen configurations (bars or discs) were compared after mechanical cycling for porcelains. Microestrutural differences between material resulted on flexural strength values statistically different, porcelains presented lower values of flexural strength (VM7: 69,4 MPa and VM9: 64,7 MPa), while AL and ICZ presented intermediate flexural strength (462,8 MPa and 408,6 MPa, respectively) and YZ presented the highest flexural strength (869 MPa). Only AL presented a significant lower flexural strength after mechanical cycling (389,2 MPa). Autoclave cycling did not influence the flexural strength of the studied materials. Also, the specimen configuration did not influence the flexural strength values before or after mechanical cycling. It should be noted that disc specimens of VM7 presented significantly higher flexural strength values than VM9 (69,6 MPa and 57,6 MPa, respectively), however for bar specimens no statistical difference was noted between the mean strength of both porcelains (VM7: 61,1 MPa and VM9: 68,8 MPa).
Syed, Shah Taqiuddin Q. "An Alternative Strengthening Technique using a Combination of FRP Sheets and Rods to Improve Flexural Performance of Continuous RC Slabs". University of Toledo / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1469151846.
Pełny tekst źródłaAlat, Ece. "Analysis Of Magnesium Addition, Hydrogen Porosity And T6 Heat Treatment Effecrts On Mechanical And Microstructural Properties Of Pressure Die Cast 7075 Aluminum Alloy". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615018/index.pdf.
Pełny tekst źródłaZhang, Lihe. "Impact resistance of high strength fiber reinforced concrete". Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/705.
Pełny tekst źródłaSaloustros, Savvas. "Tracking localized cracks in the computational analysis of masonry structures". Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461714.
Pełny tekst źródłaLos métodos numéricos son decisivos en la ingeniería para la conservación de estructuras de mampostería existentes y el diseño de estructuras nuevas. Entre ellos, los métodos macro-mecánicos de elementos finitos, basados en el concepto de fisuras distribuidas, son habitualmente los preferidos como opción asequible para el análisis de grandes estructuras de mampostería. Sin embargo, suelen resultar en a una representación poco realista del daño, distribuido en grandes áreas de la estructura, lo que impide la correcta interpretación del patrón de daño. Además, esta metodología presenta una patología más crítica, la dependencia de la malla, que influye notablemente en las predicciones de seguridad y estabilidad. Para superar estas limitaciones, esta tesis propone una nueva herramienta numérica basada en el enriquecimiento del clásico enfoque de fisuras distribuidas con un algoritmo de trazado local. El objetivo de este modelo de daño localizado es el análisis no-lineal de las estructuras de mampostería de manera realista y eficiente con una representación mejora-da de fisuras. El comportamiento no lineal de la mampostería se simula a través de la adopción de un modelo de mecánica de daño continuo con dos índices de daño, permitiendo la diferenciación entre las respuestas mecánicas de tensión y compresión de la mampostería. En este contexto, se propone e implementa una nueva formulación explícita para la evolución de deformaciones irreversibles. Se derivan dos nuevas expresiones para la regularización del ablandamiento de tracción y compresión según el ancho de banda de la fisura, garantizan-do la objetividad del modelo de daño al respecto del tamaño de la malla. La simulación del comportamiento estructural de las estructuras de mampostería en condiciones de carga y contorno generales precisa de algunos desarrollos en el contexto de los algoritmos locales de trazado. Con este objetivo, se presenta la mejora de los algoritmos locales de trazado con nuevos procedimientos que posibilitan la simulación de fisuración múltiple, arbitraria e secante bajo cargas monótonas y cíclicas. Además, se investiga el efecto de diferentes criterios de propagación de fisuras y se aborda la selección entre más de un plano de falla posible. El modelo de daño localizado propuesto se valida mediante la simulación de una serie de ejemplos estructurales. Éstos van desde pruebas a pequeña escala en probetas de hormigón, con pocas fisuras dominantes, hasta estructuras de mampostería de mediana y gran escala con fisuración múltiple de tracción, de cortante y de flexión. Los análisis se comparan con los resultados analíticos, experimentales y numéricos obtenidos con métodos alternativos disponibles en la literatura. El modelo de daño localizado mejora en gran medida la independencia de la malla del clásico método de fisuras distribuidas y reproduce patrones de daño y mecanismos de colapso de una manera eficiente y realista
Arnold, Patricia A. "Validation of Mechanical Response Tissue Analysis by Three-Point Mechanical Bending of Artificial Human Ulnas". Ohio University Honors Tutorial College / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1366983271.
Pełny tekst źródłaCAIRO, CARLOS A. A. "Desenvolvimento de um sistema de protecao antioxidante para o composito carbono-carbono". reponame:Repositório Institucional do IPEN, 1998. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10687.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Pešek, Ondřej. "Stabilitní problémy prutů z vrstveného konstrukčního skla". Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-390277.
Pełny tekst źródłaMiyazaki, Caroline Lumi. "Caracterização térmica, grau de conversão, resistência à flexão e dureza de compósitos comerciais tratados termicamente". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/23/23140/tde-18082010-124119/.
Pełny tekst źródłaAiming to optimize chemical and mechanical properties of direct composites applied in an indirect way, with an association to experimental heat treatments (TT), it is necessary a thermal characterization, in a way to determine a safe temperature for the TT (below the significant mass loss temperature). Thus, the first step of this study was to perform the thermal characterization of ten commercial composites (Z100, Filtek Z250, Z350 and Supreme XT 3M-ESPE, Esthet-X and TPH Spectrum Dentsply, Charisma Heraeus Kulzer, Tetric Ceram Ivoclar Vivadent, Herculite XRV and Point 4 - Kerr) photoactivated by continuous (C) and pulse-delay (PD) methods (20 J.cm-2), by thermogravimetry (TG) (n=1) and differential scanning calorimetry (DSC) (n=3). After that, two temperatures were chosen for the TT: 100 and 170°C, which were applied for 10 min, 24h after photoactivation. Thus, some properties were evaluated for four composites (Filtek Z250 and Supreme XT, Esthet- X and Point 4): 1) degree of conversion (GC) by FT-Raman spectroscopy (n=3); 2) three-point bending test (RF) (n=10); and 3) Knoop hardness (KHN) for top and bottom surfaces (n=3). The conditions were: immediately, 1h, 6h and 24h after photoactivation and 24h after photoactivation followed by TT at 100 or 170°C. Data were analyzed by ANOVA and Tukeys test (level of significance of 5%). In relation to GC (%), there were statistical significance for the factors material (p=0.000): Point 4 (68.42) > Z250 (63.05) = Esthet-X (61.69) > Supreme (54.27); condition (p=0.000): TT170 (73.20) = TT100 (73.58) > 24h (62.60) = 6h (60.18) > 1h (55.10) = immediately (53.66); and activation (p=0.006): C (62.97) > PD (60.75); and for the interactions: material × condition (p=0.007) and material × condition × activation (p=0.013). For RF (MPa), statistical significance were found for the factors material (p=0.000): Z250 (165.48) > Supreme (153.96) > Point 4 (131.30) = Esthet-X (128.06); and condition (p=0.000): TT170 (194.56) > TT100 (182.91) > 24h (150.88) > 6h (131.79) > 1h (111.77) > immediately (96.30); and also for the interactions: activation × condition (p=0.000), material × condition (p=0.000) and material × activation × condition (p=0.000). For KHN, statistical significance were found for the factors material-activation (p=0.000): Supreme C (82.46) > Supreme PD (80.29) = Z250 C (77.46) > Z250 PD (74.30) > Esthet-X C (69.17) > Esthet-X PD (65.67) > Point 4 C (57.21) = Point 4 PD (56.71); condition (p=0.000): TT170 (81.35) > TT100 (73.72) > 24h (70.36) > 6h (67.92) > 1h (64.99) > immediately (64.12), and face (p=0.000): top (71.40) > bottom (69.40); as for the interactions: material-activation × face (p=0.011), material-activation × condition (p=0.000) and face × condition (p=0.000). By the results, it could be concluded that both proposed experimental TTs were capable of increasing the studied properties, with, in a general way, 170°C generating better mechanical properties than 100°C, and both better than the other conditions.