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 “"Rotational Stiffness"”.
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The influence of semi-rigid connections on the behaviour of slender structures
… approacha nd engineering simplification. The rotational stiffness of baseplatesi s investigatedt heoretically and experimentally aiming at estimating the principal factors that influence the behaviour of baseplates. A beam-compressions pring model is proposedt o calculate the rotational …
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Influence of Column-Base Fixity On Lateral Drift of Gable Frames
… provide no moment at the base and have zero rotational stiffness. However, in reality every connection provides some restraint and has some rotational stiffness. Hence, by considering a modeling assumption of pinned condition, the actual behavior of the connection is not captured and this …
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Analysis of Metal Plate Connected Wood Truss Assemblies under Out-of-Plane Loads
… MPCWT assemblies under out-of-plane loads. The rotational stiffness of truss-wall connections, and truss bracing elements are included in the structural component model. Previous experimental data of fall arrest anchor loading were used for model validation. A parametric study considering …
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Elastic buckling solutions for thin-walled metal columns with perforation patterns
… plate buckling coefficient and transverse web rotational stiffness in the prediction of local and distortional buckling respectively. Global buckling prediction including the influence of perforations uses critical elastic loads of an unperforated section multiplied by the ratio of weighted to …
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Hair Bundle Stiffness in the Turtle Utricle: Structural and Regional Variations
… bundles, this work experimentally measured the stiffness of bundles with differing morphology, the stiffness contribution of interciliary links and the mechanical properties of the kinocilium in the turtle utricle. The stiffness of hair bundles of varying structure and location along a medial to …
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Classification of end plate connections with application to gable frames
… be classified. Secondly, for connections, the rotational stiffness is determined from the moment rotation curves and used in the computer code to implement flexible connections. The effect is studied on gable frames. For the loading and frame used there is not much variation in moments at the …
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A Reluctance Actuator Gap Disturbance Testbed
… actuators and to understand the nature of the rotational stiffness of the actuator. Experiments to do disturbance rejection were carried out and also different methods of force control (like Flux Feedback) are discussed and implemented
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Wind-induced dynamic responses of structures with outrigger systems
A multi-degree of freedom lumped mass model with rotational springs was built to investigate the influence of outrigger system on the natural periods and mode shapes of a structure. The presence of outrigger system was found to significantly stiffen the structure, reducing the natural periods and …
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Timber joinery in modern construction: Mechanical behavior of wood-wood connections
… be applied to any joinery geometry. First, the rotational stiffness of the Nuki joint is characterized and cross-verified using multiple methods. Second, the embodied carbon of a gravity frame using Nuki joints is compared to that of a gravity frame using conventional metallic fasteners. The use …
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Flexigami : folded polygonal unit cells for deployable metamaterials and mechanisms
… panels, consideration of the finite bending and rotational stiffness of these elements is essential to understand their constituent mechanics. Moreover, meta-materials and functional structures having fundamentally new mechanical properties can be designed this way. We present the design, …
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Effect of stressed skin action on the behaviour of cold-formed steel portal frames with non-linear flexible joints and top-hat purlins
… by testing, as follows:1) Resistance and stiffness of bolted moment-connections. The bearing resistance and stiffness of the threaded bolt shank in single and double shear lapped connections were tested and compared against design recommendations.The existing methods for deriving the …
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Structural Optimization using the Principle of Virtual Work and an Analytical Study on Metal Buildings
… literature review was conducted on the rotation stiffness provided by typical column base connections. The information obtain in the literature review was then used to create a finite element model of a typical column base connection in a metal building. Once the finite element model was …
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Design of One-Story Hollow Structural Section (HSS) Columns Subjected to Large Seismic Drift
… it is shown that it is possible to create rotational stiffness below a limit such that negligible moment develops at the column base. All the design methods are demonstrated with a design example
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Three-Dimensional Analysis of Geogrid Reinforcement used in a Pile-Supported Embankment
… arching effects could be considered, and the stiffness of the springs on top of the pile were stiffer to account for the thin layer of soil between the geogrid and the pile cap. A Mathematica algorithm was used to solve this model using the minimization of energy method. The results were …
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Damage identification in skeletal structures: A dynamic stiffness approach
… any knowledge of their severity. The Dynamic Stiffness Method was chosen due to its capabilities in enabling an exact solution while facilitating addition of new elements such as springs and masses to the structure in the same way as in the approximate Finite Element Method (FEM). Using the …
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A Virtual Model of the Human Cervical Spine for Physics-based Simulation and Applications
… helical axes of motion pattern, global rotational stiffness curves, and animations of the disc and facet forces. This model was used to evaluate different mounting configurations for axial rotation testing and to identify a set of end constraint conditions that produced physiologic …
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Assessment of Analytical Procedures for Designing Metal Buildings for Wind Drift Serviceability
… column is considered as pinned which provides no rotational restraint. The actual behavior of the connection however, is 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 …
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Modeling Cable Harness Effects on Space Structures
… for cable properties of area, density, bending stiffness, shear rigidity, and attachment stiffness are calculated and shown to be effective in cable models for natural frequency prediction. Although the cables investigated are spaceflight cables, the method can be applied to any stranded cable …
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Validation Testing of a Synthetic Spine and Upgraded Protocol for a Biomechanical Evaluation of a Lumbar Spinal Orthosis
… defined. Combined with moment data, the moment-rotational stiffness properties was compared to similar published data from other in vitro and in vivo studies of the lumbar spine. These comparisons provided validation and justification for using the synthetic model in the low back support test …
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Investigating the Performance of Wood Portal Frames as Alternative Bracing Systems in Light-Frame Wood Buildings
… significant increase in the moment capacity and rotational stiffness by replacing the Spruce-Pine Fir (SPF), header with the Laminated Veneer Lumber (LVL) header. The addition of the FRP to the standard wall configuration also resulted in a significant increase in the moment capacity. However, no …
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