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 20 for “"lateral stiffness"”.
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Effect of Lateral Stiffness on Bridge Deck Performance
… membrane stress set-up as an effect of the lateral restraint surrounding the deck slab known as Compressive Membrane Action (CMA). It has been proved through research that most design codes underestimate the strength of laterally restrained slabs. However, there is still a lack of acceptance …
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Applications of force actuators and variable stiffness systems with base isolation
… with significantly increased strengths, but the stiffness of these materials have not increased at the same rate. Motion parameters control the design for these high-strength materials. Finally, recent earthquake responses have shown that repair costs from structural damage due to inelastic …
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Design and Analysis of End-Effector Systems for Scribing on Silicon
… mechanism is passively controlled, has high lateral stiffness, and low axial stiffness. The mechanism is analyzed using the pseudo-rigid-body model and linear-elastic beam method to determine the axial stiffness, finite element methods to determine the lateral stiffness, and fatigue analysis …
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A Comparative Study on Seismic Analysis Methods and the Response of Systems with Classical and Nonclassical Damping
… 7-10) and used for application of the Equivalent Lateral Force Procedure (ELFP) and Response Spectrum Analysis (RSA). When applying RSA, the modal peak responses were combined using the Absolute Sum (ABS), Square-Root-of-the-Sum-of-Squares (SRSS), and Complete Quadratic Combination (CQC) …
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Application of damping in high-rise buildings
… structural system has proven to be an efficient lateral stiffness system for high-rise buildings under static loadings. The purpose of this thesis is to research the incorporation of viscous dampers into the outrigger system to improve the dynamic performance. This study will be conducted on a …
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Effect of oncomodulin on cytoskeletal actin dynamics.
… actin dynamics in OHCs. Early studies of OHC lateral stiffness and motility suggest that calcium modifies the actin-based cortical cytoskeleton. An EF-hand calcium buffering protein, oncomodulin (OCM) is preferentially expressed in OHCs and may aid in sculpting calcium signals important for …
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The 4-dimensional masonry construction
… (catenary systems and double curvature for lateral stiffness), the techniques of graphical analysis to define such a structure spatially, and the logic of sequencing to maintain the units' systematic relation, to constrain units inherently given to push the limits of constructibility.
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NUCARS Modeling of a Freight Locomotive with Steerable Trucks
… to stability and varying the flexicoiling stiffness has little effect. In curving, the clearances between the axles and truck frame are very important. Limiting these clearances in the steerable truck causes it to curve similar to a conventional straight locomotive truck and increases both …
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The effect of bandsaw stresses of blade stiffness and cutting accuracy
… study of the effect of bandsaw stresses on blade stiffness and cutting accuracy for the bandmills used for primary breakdown in North American sawmills. The effect of bandsaw roll-tensioning and bandmill axial forces on the stresses in the blade, on the interaction of the blade with the bandmill …
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Nanoscale structure and transport : from atoms to devices
… changing the tube's diameter, leading to high lateral stiffness. Self-trapped hole structures in amorphous silicon dioxide are investigated in order to connect the behavior of hole currents to atomic-scale structures. Calculations on a paired-oxygen analogue to the ... center show that such a …
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Seismic retrofitting of the Ste-Justine Hospital in Montreal
… reinforced concrete structure to resist lateral forces. In their current conditions, the existing buildings do not meet the actual code requirements by a wide margin, and seismic retrofitting is a priority. This thesis presents different solutions for increasing the lateral rigidity of …
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Prediction of the off-road rigid-ring model parameters for truck tire and soft soil interactions
… of the tire. The total equivalent vertical stiffness on a dry sand is not as heavily influenced by the inflation pressure compared to predictions on a hard surface. For perspective, at 110 psi, the dry sand total vertical stiffness is nearly nine times smaller than that determined on the …
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The performance of diaphragm type cellular cofferdams
… spacing and membrane effects whilst reducing the lateral stiffness of the wall to accommodate the stiffness reduction due to variation in the interlock forces.<br/><br/>To measure the bending moment in sheet piles, resistance type strain gauges were installed on a 13m wide section of cofferdam. …
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Non-Contact Lap Splices in Geometrically Dissimilar Bridge Column to Drilled Shaft Connections
… splice distance generally exhibited lower lateral stiffness and lower capacity. The increase in the non-contact splice distance yielded significant inclined cracks and splitting cracks in the non-contact lap splice zone. The angle of inclined cracks was observed to increase with increasing …
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Assessment of Analytical Procedures for Designing Metal Buildings for Wind Drift Serviceability
… partially rigid, that provides some rotational stiffness even in case of single row of bolts. Moreover, using a two-dimensional (planar) structural model for analysis ignores any load distribution provided by roof and wall sheeting. Simulation of true behavior of base connection and diaphragm …
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Balloon-type CLT Shearwalls: Lateral Deformation and Kinematic Behaviours
… systems have been increasingly adopted as lateral load-resisting systems in mid-rise timber buildings. Compared with platform-type configurations, balloon-type shearwalls mitigate bearing failure associated with perpendicular-to-grain compression at floor levels, while also reducing …
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Parameters Influencing Seismic Structural Collapse with Emphasis on Vertical Accelerations and the Possible Related Risks for New and Existing Structures in the Central and Eastern United States
… were associated with the SDOF models — the lateral stiffness, the post-yield stiffness ratio, the yield strength, and the stability ratio (P-Delta effects). Then, three parameters were associated with the ground motions — the records themselves, the lateral ground motion scales, and the …
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Seismic Analysis and Response of Highway Bridges with Hybrid Isolation
… is the ability of the abutments to take high lateral loads without damaging the underlying piles.This technique is applicable to a wide range of bridges including those not suitable for full isolation, such as a bridge with a continuous superstructure that is monolithic with its piers. Hybrid …
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Stiffness Model of a Die Spring
… research is to determine the three-dimensional stiffness matrix of a rectangular cross-section helical coil compression spring. The stiffnesses of the spring are derived using strain energy methods and Castigliano's second theorem. A theoretical model is developed and presented in order to …
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A Laboratory and Field Study of Composite Piles for Bridge Substructures
… questions relate to driving efficiency, axial stiffness, bending stiffness, durability, and surface friction. These questions exist because there is not a long-term track record of composite pile use and there is a scarcity of well-documented field tests on composite piles. This research …