Tesis sobre el tema "Ground structures"
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Trygstad, Steinar. "Structural Behaviour of Post Tensioned Concrete Structures : Flat Slab. Slabs on Ground". Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-114.
Texto completoIn this investigation strength and structural behaviour of prestressed concrete is studied with one full scale test of one flat slab, 16000 mm x 19000 mm, and three slabs on ground each 4000 mm x 4000 mm with thickness 150 mm. The flat slab was constructed and tested in Aalesund. This slab has nine circular columns as support, each with diameter 450 mm. Thickness of this test slab was 230 mm and there were two spans in each direction, 2 x 9000 mm in x-direction and 2 x 7500 mm in y-direction from centre to centre column. The slab was reinforced with twenty tendons in the middle column strip in y-direction and eight tendons in both outer column strips. In x-direction tendons were distributed with 340 mm distance. There were also ordinary reinforcement bars in the slab. Strain gauges were welded to this reinforcement, which together with the deflection measurements gives a good indication of deformation and strains in the structure.
At a live load of 6.5 kN/m2 shear failure around the central column occurred: The shear capacity calculated after NS 3473 and EuroCode2 was passed with 58 and 69 %, respectively. Time dependent and non-linear FE analyses were performed with the program system DIANA. Although calculated and measured results partly agree well, the test show that this type of structure is complicated to analyse by non-linear FEM.
Prestressed slabs on ground have no tradition in Norway. In this test one reinforced and two prestressed slabs on ground were tested and compared to give a basis for a better solution for slabs on ground. This test was done in the laboratory at Norwegian University of Science and Technology in Trondheim. The first slab is reinforced with 8 mm bars in both directions distributed at a distance of 150 mm in top and bottom. Slab two and three are prestressed with 100 mm2 tendons located in the middle of slab thickness, and distributed at a distance of 630 mm in slab two and 930 mm in slab three. Strain gauges were glued to the reinforcement in slab one and at top and bottom surface of all three slabs. In slab two and three there were four load cells on the tendons.
Each slab were loaded with three different load cases, in the centre of slab, at the edge and finally in the corner. This test shows that stiffness of sub-base is one of the most important parameters when calculating slabs on ground. Deflection and crack load level depends of this parameter. Since the finish of slabs on ground is important, it can be more interesting to find the load level when cracks start, than deflection for the slab. It is shown in this test that crack load level was higher in prestressed slabs than in reinforced slab. There was no crack in the top surface with load in the centre, but strain gauges in the bottom surface indicate that crack starts at a load of 28 kN in the reinforced slab, and 45 kN in the prestressed slabs. Load at the edge give a crack load of 30 kN in reinforced slab, 45 kN and 60 kN in prestressed slabs. The last load case gives crack load of 30 kN in reinforced slab, 107 kN and 75 kN in prestressed slabs. As for the flat slab, FE analyses were performed for all of the three slabs on ground, and analyses shows that a good understanding of parameters like stiffness of sub-base and tension softening model, is needed for correct result of the analyses.
Barlow, Mark S. (Mark Steven). "Modeling and ground modal identification of space structures". Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/43247.
Texto completoAnnam, Kaushik. "Design of Bandstop Filters Using Defected Ground Structures". University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1438420662.
Texto completoHassani, Nezhad Gashti E. (Ehsan). "Thermo-mechanical behaviour of ground-source thermo-active structures". Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526214061.
Texto completoTiivistelmä Kasvaneet energiakustannukset ja kiristyneet ympäristösäädökset ovat lisänneet geotermisten energiaratkaisujen suosiota. EU, mukaan lukien Suomi, on asettanut tavoitteekseen lisätä uusiutuvien energialähteiden käyttöä ja vähentää hiilidioksidipäästöjä. Geotermistä energiaa hyödyntävä paaluperustukset, niin kutsutut energiapaalut, tarjoavat uudenlaisen teknologian vähäpäästöisen energian tuottamiseen. Geotermiset lämpöpumppujärjestelmät, maalämpöpumput, ovat taloudellisia ja ympäristöystävällisiä energiantuotantomenetelmiä, jotka talviaikaan siirtävät maaperään varastoitunutta energiaa rakennuksen lämmittämiseen ja vastaavasti jäähdyttävät rakennusta kesällä siirtämällä lämpöä maaperään. Energiapaalujen taloudellisuus syntyy siitä, että ne pystyvät palvelemaan rakennusta kahdessa roolissa. Ne ovat osa rakennuksen energiajärjestelmää ja toimivat samalla myös kantavana rakenteena, joka siirtää rakennuksen kuormia perustuksilta maaperään. Lämpöpumppujärjestelmän kytkeminen paaluihin voi johtaa lämpötilan vaihteluun paaluissa sekä niitä ympäröivässä maaperässä, mikä puolestaan vaikuttaa paalujen ja maaperän lämpömekaanisiin, rakenteellisiin sekä geoteknisiin ominaisuuksiin. Vaikka energiapaaluja on asennettu jo paljon, ei paalujen lämpömekaanisesta käyttäytymisestä tai energiatehokkuudesta kylmien ilmastojen alueilla ole vielä paljoa tutkittua tietoa. Tässä väitöstutkimuksessa selvitettiin numeerisesti energiapaalujen rakennuspaikan pohjaolosuhteista riippuvaa tuottopotentiaalia Skandinaavisissa olosuhteissa ja ilmastossa. Tarkastelut kohdistuivat erityisesti pohjavesivirtauksen sekä vuodenaikojen ja ilman lämpötilan vaihtelun vaikutuksiin. Tutkimuksessa arvioitiin myös paalujen lämpötilan vaihtelujen vaikutuksia paalujen geoteknisiin ja rakenteellisiin ominaisuuksia sekä kestävyyteen. Numeeristen simulaatiotulosten perusteella betonipaaluun asennetun U-putkirakenteen avulla saavutetaan paras tuottopotentiaali. Tulokset osoittivat, että kohtalainen pohjaveden virtaus parantaa systeemin tuottoa noin 20 % verrattuna tilanteeseen, jossa vedellä kyllästetyssä maassa ei tapahdu pohjaveden virtausta. Analyysitulokset osoittavat myös, että paalujen lämpötilavaihteluista aiheutuvat lisäjännitykset vähentävät paalujen kantokykyä, mikä tulee ottaa huomioon paalujen mitoituksessa
Crawford, James MacKenzie. "Ground testing and model updating for flexible space structures". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63579.pdf.
Texto completoBoxill, Lois E. C. "Foundation remediation of existing structures using ground densification methods". Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/21792.
Texto completoTsioulou, Alexandra. "Simulated ground motions for seismic risk assessment of structures". Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10062053/.
Texto completoChan, Elim. "Radiation and scattering of structures above perfect and imperfect ground". Thesis, University of Ottawa (Canada), 1988. http://hdl.handle.net/10393/5204.
Texto completoCropley, Ford. "Coherent vortical structures in the atmospheric boundary layer near ground". Thesis, Cranfield University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281042.
Texto completoWu, Shuanglan. "Near-fault Ground Motions for Seismic Design of Bridge Structures". Kyoto University, 2018. http://hdl.handle.net/2433/232017.
Texto completoKoukleri, Stavroula. "Inelastic earthquake response and design of multistorey torsionally unbalanced structures". Thesis, University College London (University of London), 2000. http://discovery.ucl.ac.uk/1349433/.
Texto completoCaporaletti, Paola. "Tunnelling in layered ground and its effects on pre-existing masonry structures". Doctoral thesis, La Sapienza, 2005. http://hdl.handle.net/11573/917015.
Texto completoIwasaki, Yoshinori. "Geotechnical Study on Ground and Masonry Structures in Angkorfor Safeguarding Monuments". 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/138469.
Texto completoWard, Charles. "Modification of a Ground Based Atomic Oxygen Simulation Apparatus to Accommodate Three Dimensional Specimens". DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1850.
Texto completoRamshaw, Christine Lesley. "Computation of ground waves from pile driving and their effects on structures". Thesis, Durham University, 2002. http://etheses.dur.ac.uk/3762/.
Texto completoMansour, Sharief Ramsis Nasief. "Evaluation of a novel design of masonry structures subject to ground movement". Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47172.
Texto completoMedina, Ricardo A. Krawinkler Helmut. "Seismic demands for nondeteriorating frame structures and their dependence on ground motions /". Berkeley : Pacific Earthquake Engineering Research Center, 2004. http://peer.berkeley.edu/publications.
Texto completo"May 2004." "John A. Blume Earthquake Engineering Center, Dept. of Civil & Environmental Engineering, Stanford University." Includes bibliographical references.
Kang, GiChun. "Assessing uplift displacement of buried geotechnical structures in liquefied ground during earthquakes". 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120829.
Texto completoBianchini, Marcello <1976>. "Improved ground motion intensity measures for reliability-based demand analysis of structures". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/959/1/Tesi_Bianchini_Marcello.pdf.
Texto completoBianchini, Marcello <1976>. "Improved ground motion intensity measures for reliability-based demand analysis of structures". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/959/.
Texto completoParsa, Amanullah. "EFFECT OF BUILDING ORIENTATION ON STRUCTURAL RESPONSE OF REINFORCED CONCRETE MOMENT RESISTING FRAME STRUCTURES". OpenSIUC, 2020. https://opensiuc.lib.siu.edu/theses/2698.
Texto completoHong, S. G. "Analysis and optimisation of passenger car front structures in frontal barrier impact". Thesis, Cranfield University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334670.
Texto completoZhao, Ke. "The electronic structures of C28 and U@C28". The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1100808287.
Texto completoOzdemir, Gokhan. "Response Of Isolated Structures Under Bi-directional Excitations Of Near-field Ground Motions". Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12612039/index.pdf.
Texto completoHenriquez, Nicholas. "Analyzing buried reinforced concrete structures subjected to ground shock from underground localized explosions". [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024817.
Texto completoPan, Peng. "Safety and functionality of base-isolated building structures subjected to vertical ground motions". 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/145351.
Texto completoWhitney, Joshua Andrew. "Application of Electromagnetic Methods to Identify and Characterize Sub-surface Structures Associated with the Coles Hill Uranium Deposit". Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/33080.
Texto completoMaster of Science
Brown, Andrew y Hua Lee. "SYNTHETIC APERTURE GROUND PENETRATING RADAR IMAGING FOR NONDESTRUCTIVE EVALUATION OF CIVIL AND GEOPHYSICAL STRUCTURES". International Foundation for Telemetering, 2001. http://hdl.handle.net/10150/607690.
Texto completoSynthetic-aperture microwave imaging with ground penetrating radar systems has become a research topic of great importance for the potential applications in sensing and profiling of civil and geophysical structures. It allows us to visualize subsurface structures for nondestructive evaluation with microwave tomographic images. This paper provides an overview of the research program, ranging from the formation of the concepts, physical and mathematical modeling, formulation and development of the image reconstruction algorithms, laboratory experiments, and full-scale field tests.
Sangiovanni, Maria. "Analysis of the response of irregular structures to the 2012 Emilia Earthquake ground-motions". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/4239/.
Texto completoTheophilou, Artemis I. "A ground motion selection and modification method suitable for probabilistic seismic assessment of building structures". Thesis, University of Surrey, 2013. http://epubs.surrey.ac.uk/811162/.
Texto completoOlgun, Celal Guney. "Performance of Improved Ground and Reinforced Soil Structures during Earthquakes – Case Studies and Numerical Analyses". Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/26002.
Texto completoPh. D.
Glicklin, Max Jay. "Development of a Ground Based Atomic Oxygen and Vacuum Ultraviolet Radiation Simulation Apparatus". DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/799.
Texto completoRamin, Latifi. "Effect of pulse-like near-fault ground motions on inelastic response of structures including foundation flexibility". Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45534.
Texto completoRivera, Mario A. "Seismic Response of Structures with Flexible Floor Slabs by a Dynamic Condensation Approach". Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29645.
Texto completoPh. D.
Ieronymaki, Evangelia S. "Prediction and interpretation of ground movements due to tunneling in stiff clay and impacts on adjacent structures". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99610.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 319-328).
Construction of large diameter tunnels is frequently accomplished by closed face tunnel boring machines (TBM) using a combination of face pressure and grouting around the precast lining in order to limit ground movements and potential damage to overlying structures. This thesis analyzes monitoring data from the Crossrail project involving twin tunnels construction using Earth Pressure Balance (EPB) machines in London Clay. The research focuses on the 'greenfield' response during tunnel excavation beneath Hyde Park. Far-field measurements of surface and subsurface ground movements were interpreted using 2D finite element analyses using a range of constitutive models with parameters calibrated to non-linear stress-strain properties measured in high quality laboratory tests on London Clay. The analyses optimize three input parameters corresponding to boundary deformations around the tunnel cavity, using a least squares fit to the measured ground movements. The results for the first tunnel (WB) show that even simple soil models are able to achieve good agreement with far field ground deformations, while more complex models (MIT-Si) can represent accurately movements occurring much closer to the tunnel lining and hence, provide a more reliable guide to deformation sources at the tunnel cavity. The study also shows how ground movements induced by the second (EB) tunnel were influenced by proximity to the completed WB tunnel. The results provide a comprehensive view of the ground movement pattern and a useful framework for understanding how ground response is linked to EPB control parameters that can be investigated using 3D finite element models. Comparisons with data from prior open-face shield construction of the Jubilee Line Extension (in similar ground conditions) show that there are pervasive differences in the magnitudes and cavity deformations modes associated with different methods of tunnel construction. The current analyses of soil-structure interaction consider the measured deformations of a concrete-framed structure, Avenfield House, caused by the twin Crossrail tunnels. The thesis proposes a simple elastic shear beam model of the structure and assumes that the cavity deformation parameters are uncoupled from the presence of the structure. The results demonstrate that deformations of the structure can be predicted using information from the greenfield ground response.
by Evangelia S. Ieronymaki.
Ph. D.
Chen, Guang. "Modeling and Characterization of Plane Pair Structures in High-Speed Power Delivery Systems". Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195454.
Texto completoErdogan, Burcu. "Simple Models For Drift Estimates In Framed Structures During Near-field Earthquakes". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608699/index.pdf.
Texto completoKöberle, Patrick [Verfasser]. "Ground-state structures and dynamics of dipolar Bose-Einstein condensates in single and multi-layered traps / Patrick Köberle". München : Verlag Dr. Hut, 2011. http://d-nb.info/1016531664/34.
Texto completoRigato, Antonio Bruno. "Influence of angle of incidence on the seismic demands for inelastic structures subjected to bi-directional ground motions". College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/7360.
Texto completoThesis research directed by: Civil Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Halling, Marvin W. Hall John F. Hall John F. "Investigation of base-isolated structures during recent earthquakes and computer simulations utilizing near-source long-period ground motions /". Diss., Pasadena, Calif. : California Institute of Technology, 1995. http://resolver.caltech.edu/CaltechETD:etd-10152007-141910.
Texto completoArben, PITARKA. "Modeling wave propagation in two-and three dimensional heterogeneous structures and its application to the strong ground motion prediction". 京都大学 (Kyoto University), 1997. http://hdl.handle.net/2433/202446.
Texto completoCALCINA, SERGIO VINCENZO. "Ambient vibration measurements for non-destructive evaluation of structures by means of seismic methods and ground-based microwave interferometry". Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266845.
Texto completoTodkar, Shreedhar Savant. "Monitoring subsurface conditions of pavement structures using Ultra-wideband radar technology". Thesis, Nantes, 2019. http://www.theses.fr/2019NANT4060.
Texto completoIn the field of civil engineering, the detection and characterization of defects (debondings, non-emerging cracks) are important diagnostic elements that influence the maintenance and management of the pavement structure. These defects represent an altered state of the structure. The geometric characteristics of these defects (shape, width and length) as well as their extent and the water seepage induced by these defects are important durability indicators of the structures. This detection makes it possible to locate a possible pathology, to evaluate the state of health of the structure and also predict its evolution. In this context, "pulse radar" systems, also called Ground Penetrating Radar (GPR) have been used for over thirty years to perform non- destructive testing operations in the traffic flow. They not only provide continuous measurement of the thickness of the pavement layer, but also allow the detection of significant (centimetric) inter-layer detachments, and thus determine the location of subsequent destructive structural controls. However, the temporal resolution of conventional GPRs does not allow direct detection of millimeteric interface debondings. Therefore, the objective of this work is to realize an early detection of such defects. My work is thus focused on both the use of ultra-wideband radar (SFR) and the development of artificial intelligence methods (based on supervised learning) to detect thin debondings. Theoretical and experimental approaches (Cerema test pavement slabs and IFSTTAR's fatigue carousel) were realized which have shown the feasibility of detecting fine debondings in pavements
Stefanou, Stefanos. "Design, fabrication and characterisation of advanced substrate crosstalk suppression structures in silicon on insulator substrates with buried ground planes (GPSOI)". Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268642.
Texto completoHowlader, Md Omar Faruq. "Development of a wall climbing robot and ground penetrating radar system for non-destructive testing of vertical safety critical concrete structures". Thesis, London South Bank University, 2016. http://researchopen.lsbu.ac.uk/1798/.
Texto completoRoca, Vich Isabel. "How the ground state in a material will be affected by the spin-phonon interactions between nuclei in diatomic molecular structures". Thesis, Uppsala universitet, Materialteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-297712.
Texto completoShrestha, Bipin. "Numerical and Experimental study of pounding damages in adjacent bridge structures subjected to spatially varying ground motion and its mitigation method". Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/469.
Texto completoOksuz, Nevin. "Quantum-chemical Study Of Geometrical And Electronic Structures Of Aromatic Five-membered Heterocyclic Oligomers In The Ground And Lowest Singlet Excited States". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605397/index.pdf.
Texto completooligothiophenes (nT), oligofurans (nF), and oligopyrroles (nP)- containing up to six monomer units (total of 18 molecules) were explored using several computational methodologies. Geometry optimizations were carried out at Austin Model 1 (AM1), Restricted Hartree-Fock (RHF/6-31G*), and Density Functional Theory (DFT, B3LYP/6-31G*) levels for the ground-state conformations of these structurally well-defined heterocyclic oligomers. The Configuration Interaction Singles (CIS) method with the 6-31G* basis set was chosen in computation of the optimal geometry of the lowest singlet excited state. Lowest singlet excitation S1ß
S0 energies were calculated using the Zerner&rsquo
s Intermediate Neglect of Differential Overlap for Spectroscopy (ZINDO/S), CIS (CIS/6-31G*), and Time-Dependent DFT (TDDFT/6-31G* and TDDFT/6-31+G*) methods. In computation of the emission S1à
S0 energies, we have employed all methods above except ZINDO/S. In investigation of geometries of the ground and lowest singlet excited state, we compared the bond length alternation (BLA) parameters, Dri in the conjugated backbone of the oligomers. Saturation of the geometrical parameters at the center of oligomers was observed after a certain chain length. Among all methodologies used in computation of excitation (S1ß
S0) and emission (S1à
S0) energies, TDDFT results showed the best agreement with experimental data. Fits of computed and experimental excitation energies to an exponential function using the least squares method enabled us to predict Effective Conjugation Length (ECL) values. We obtained the ECLs of 17 (17), 16 (15), and 14 (13) monomer units for polythiophene (PTh), polyfuran (PFu), and polypyrrole (PPr), which have very good agreement with the results obtained from the fits of experimental data (the values in parentheses).
Yue, Hailing. "Reconfigurable Passive RF/Microwave Components". University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1467817602.
Texto completoAbidin, Zuhairiah Zainal. "Design, modelling and implementation of antennas using electromagnetic bandgap material and defected ground planes : surface meshing analysis and genetic algorithm optimisation on EBG and defected ground structures for reducing the mutual coupling between radiating elements of antenna array MIMO systems". Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5385.
Texto completo