Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Collapse Mechanism"”.
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Study of the I-35W Highway Bridge Collapse Mechanism
… I-35W Highway Bridge in Minneapolis, Minnesota collapsed on August 1, 2007 while roadwork was underway on the bridge. The entire truss was recovered from the river to study the causes of failure. The National Transportation Safety Board attributes the collapse to inadequate load carrying …
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Web crippling of hot-rolled beams at stiffened-seat connections
… web crippling design equations are based on a collapse mechanism developed for interior web crippling of short-span plate girders. Yield-line theory and the mechanism solution were used to derive an expression for the web crippling capacity of a plate girder subjected to an interior patch load. …
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Static Stability and Seismic Safety of Brunelleschi’s Dome of Santa Maria del Fiore
… A simplified 2D analytical model predicts the collapse mechanism due to ground acceleration (0.15g) by adjusting the equilibrium analysis used to find the thrust values. This value is compared with experimental values obtained from a static tilt test, where the 3D-printed geometry of the dome …
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Bench-scale modeling to evaluate the mechanical effects of subsidence on a monofill-type landfill cover
… Nevada Test Site. Of particular interest is the collapse mechanism of the cover with respect to the soil density and compaction water content. Collapse in covers compacted at lower water content was in the form of progressive upward caving by consistent raveling, with distinct, continuous …
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Equilibrium systems : studies in masonry structure
… within the masonry and to predict possible collapse modes. The models are interactive and parametric to explore the relation between the different geometrical parameters and the possible equilibrium conditions. Collapse mechanism analyses are determined by combining kinematics and statics. …
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Equilibrium analysis of topological interlocking for structural assemblies
… assemblies through a detailed analysis of the collapse mechanism. The method also features a novel way to transform indeterminate problems into determinate problems using the geometric relations, by an implementation of the half-edge data structure in mesh manifold computation. The thesis also …
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The quasi-static and dynamic responses of metallic sandwich structures
… of a lattice material and (ii) investigate the collapse response of two competing prismatic sandwich cores employed in ship hulls. First, the finite element method is used to examine the effect of carburisation and strain hardening upon the compressive response of a pyramidal lattice made from …
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Consequences of Simultaneous Local and Overall Buckling in Stiffened Panels
… for predicting stiffener-induced compressive collapse of stiffened panels. An alternative approach is to use orthotropic plate theory. As part of the validation of the new beam-column method, ABAQUS elasto-plastic Riks ultimate strength analyses were made for 107 stiffened panels ¨C the 55 …
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Nonlinear Finite Element Analyses of the End Web Crippling Strength of W-Shape Steel Beams
… of these equations, which is based on an assumed collapse mechanism, is conservative especially for long bearing lengths. Most of the experimental studies conducted to validate those formulas have considered short span lengths and relatively small bearing-to-depth ratios. Therefore, a further …
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An examination of flow characteristics in collapsing elastic tubes
A hydraulic collapse mechanism was incorporated into a recirculating pulsatile flow system to simulate the physiologic problem cf coronary artery vasospasm. A dimensional analysis of the hemodynamic problem provided the basis for i) the specifications for elastic test sections (both straight and …
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Investigating the foundations of quantum physics with optomechanical setups
… Among the alternatives to quantum mechanics, collapse models propose an objective modification of standard quantum theory to restore macrorealism at large scale. They predict a loss of coherence when scaling towards macroscopic systems, due to a spontaneous collapse mechanism included into the …
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Collapse mechanisms of small-scale unreinforced masonry vaults
… High-speed cameras are used to capture the collapse mechanism of the vaults. The analyses include equilibrium methods executed through Excel and Matlab programs, publicly available online applets for arch stability, and hand calculations. The testing and analysis carried out in this thesis …
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Investigation of the Failure Mechanisms of Intact and Deteriorated Culverts
… as well as the influence of different failure mechanisms on corrugated steel culverts. An accelerated corrosion technique was first developed to degrade multiple pipe specimens to different degrees of deterioration. A total of six deteriorated pipe specimens were created. Two dimensional maps …
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Shake table testing of hybrid wood shear wall system
… This test was conducted to understand the collapse mechanism of the structure and demonstrated the ability of the post-tensioned CLT to re-center the structure after 5% inter-story drifts and also the ability of the LiFS walls to act as energy dissipation and lateral force resisting systems.
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Model Validation for a Steel Deck Truss Bridge over the New River
… to understand the structural behavior and collapse mechanism of the erstwhile I-35W bridge in Minneapolis, MN. Objectives accomplished toward this end include investigation of lacing effects on built up member strain detection, live load testing of a steel truss bridge, and evaluating …
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Poly(L-Lactic Acid) Langmuir Monolayers at the Air/Water Interface and Langmuir-Blodgett Films on Solid Substrates: Phase Behavior, Surface Morphology, and Crystallinity
… the Langmuir-Blodgett (LB) technique as a mechanism for fabricating PLLA substrates at temperatures where PLLA degradation is uncommon. In order to fully understand surface morphologies of PLLA LB-films, studies of Langmuir monolayers at the air/water (A/W) interface using surface …
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Collapse of masonry structures
This dissertation examines the collapse of masonry structures in response to large support displacements and horizontal ground accelerations. There are two main classes of masonry structure: arches that thrust, and supporting elements, such as walls and buttresses, which resist the thrust. This …
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Janus Particles at the Air-Water Interface: Single particle behavior, particle-laden interfaces, and implications for self-assembly
… as amphiphilicity increases. Additionally, the collapse mechanism changes from irreversible wrinkling to reversible wrinkling and folding as we increase the hydrophobicity of the gold hemisphere of the particle.</p> <p>The knowledge gained from single and multi-particle experiments showcases how …
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Collapse simulations of steel buildings under fire
Collapse analysis of steel structures under extreme hazards has been placed on the forefront of research in recent decades. This was primarily motivated by the September 11, 2001, terrorist attacks, which caused the complete collapse of the World Trade Centers (WTCs) including WTC-7. The collapse, …
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Mechanochemistry of metal-organic frameworks under compression
… energy absorption via an internal volume collapse mechanism. In this dissertation, the mechanical and mechanochemical behaviors of MOFs under compression, especially their energy absorption during plastic deformation, are explored. The structural impact of static, bulk compression has been …
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