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 40 for “"hysteretic behavior"”.
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Modeling of Hysteretic Behavior of Beam -Column Connections Based on Self -Learning Simulation
… cyclic material model is applied to inelastic hysteretic behavior of connections. In the proposed model, two energy-based internal variables are introduced to expedite the learning of hysteretic behavior of materials or structural components. The model has significant advantages over …
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Analysis of Memristor Hysteretic Systems: A Hybrid Coupled Model with emphasis on Pinching/Degrading Behavior
… model that accurately captures the asymmetric hysteretic behavior of memristive devices exhibiting self-crossing hysteresis loops. The proposed model combines the Bouc-Wen Baber-Noori model with other non-linear elements in the resistive switching process. Existing models for memristive …
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Development and Design of Self-Sensing SMAs using Thermoelectric Effect
… of this sensor. This sensor is used to study the hysteretic behaviour of SMAs. Although Shape Memory Alloys (SMAs) exhibit a myriad of nonlinearities, SMAs show two major types of nonlinear hysteresis. During cyclic loading of the SMAs, it is observed that one type of hysteretic behavior depends …
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Experimental Characterization of Heterogeneous Deformation Due to Phase Transformations, Twinning, and Slip Deformation Using Digital Image Correlation
… such as strain hardening and softening, the hysteretic behavior, the strain-rate dependence, twinning strain, twin-twin intersections, twin fraction evolution, dynamic strain aging, grain interactions, mesoscopic slip bands, and a RVE size.
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Computational simulation and analytical development of Buckling Resistant Steel Plate Shear Wall (BR-SPSW)
… at small loads which results in highly pinched hysteretic behavior, low stiffness, and limited energy dissipation. To mitigate these shortcomings, a new type of SPSW has been developed and investigated. The buckling resistant steel plate shear wall (BR-SPSW) utilizes a unique pattern of cut-outs …
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Bolted Flange Alternatives for Moment -Resisting Connections
… inelastic rotations of the joint with stable hysteretic behavior.
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Hybrid mathematical and informational modeling of beam-to-column connections
… depends on the proper modeling of connection behavior. The primary challenge of modeling beam-to-column connections is their inelastic response and continuously varying stiffness, strength, and ductility. In this dissertation, two distinct approaches—mathematical models and informational …
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Seismic Behavior of concrete filled steel Tubular Built-up columns
… seldom research has been reported on the dynamic behavior of CFST built-up columns. The present research investigates the seismic behavior of CFST built-up columns. A detailed literature survey on the CFST built-up structures, including mechanical characteristics, applications, ductility in …
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Application of SMA fiber composite as seismic reinforcement for concrete moment resisting frames
… steel bars. However, due to their linear elastic behavior, they are not considered in structures which require ductility and damping characteristics. The use of shape memory alloys (SMAs) with their nonlinear-elastic behavior in the composite could potentially provide solution for this problem. …
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Experimental Study of Ring-Shaped Steel Plate Shear Walls
… of the resulting RS-SPSW system can exhibit full hysteretic behavior and possess greatly improved stiffness relative to thin unstiffened SPSW. The concept has been validated through testing on seven 34 in x 34 in panels. General conclusions about influence of different geometric parameters on …
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A performance based approach for seismic design with hysteretic dampers
… restrained braces that dissipate energy by hysteretic behavior. Research conducted in the past reveals that devices such as The Unbonded Brace (TM) provide stiffness and damping to the structure, two key parameters that characterize a building's performance. The focus of this thesis is the …
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Design and Development of High-Frequency Switching Amplifiers Used for Smart Material Actuators With Current Mode Control
… Its capacitance is non-linear and its strain is hysteretic with respect to its electrical control signal. This actuator's reactive load property usually causes a large portion of reactive power circulating between the power amplifier and the driven actuator, thus reduces the circuit efficiency in …
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Evaluation of linear and nonlinear vibration methods to characterize induced microstructural damage in portland cement-based materials
… practical vibration methods to characterize the behavior of portland cement paste and mortar subjected to oven drying and alkali silica reaction (ASR) activity, respectively, and thus to infer and to distinguish the resulting microstructural changes. The effect of internal moisture content on the …
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Net Flow Through Soft Porous Media Generated by a Periodic Mean-Zero Pressure Gradient
… period. The system is also shown to demonstrate hysteretic behavior, where complex packing features form and persist in the solid phase, influencing the results of the system for subsequent experiments. Results from this experiment have important implications for fluid flow in biological tissues, …
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Modeling of nonstationary earthquake ground motion and biaxial and torsional response of inelastic structures
… characters have been considered, e.g., hysteretic behavior of restoring force, biaxial interaction, torsional response and degradation of the structure, and nonstationary behavior of ground excitation. A new stochastic ground motion model is proposed in which both intensity and frequency …
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Modeling and robust adaptive control of metal cutting via application of piezoactuator
… the piezoactuator itself also exhibits hysteretic behavior. Thereafter, the turning system investigated in this thesis is described as a class of uncertain systems with hysteresis and time delay. The novelty of this thesis is that the hysteresis model is for the first time incorporated …
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Effect of Hysteresis Type on Drift Capacity for Global Collapse of Moment Frame Structures for Seismic Loads
It is conjectured that different hysteresis behavior in moment frames subjected to seismic loads may lead to different levels of response because of degradation in strength and stiffness. To examine the existence and magnitude of this effect, this research aims to: (1) Determine the global collapse …
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Variation of electrical resistance in superelastic NiTi for sensor applications
… focuses on NiTi which displays superelastic behavior above room temperature. To assess the material's potential as a strain sensing medium, the NiTi wire is shape-set into coil springs which amplify the sensor's net deformation. The relationship between strain and resistance is measured. The …
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Formulation and Validation of a Nonlinear Shell Element for the Analysis of Reinforced Concrete and Masonry Structures
… models should capture nonlinear material behavior as well as the geometrically nonlinear response of RC/RM shear wall structures during major seismic events. This thesis outlines the formulation and validation of a nonlinear shell element for the simulation of RC/RM structures. The …
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Topology Optimization of Steel Shear Fuses to Resist Buckling
… with specific geometry can develop a stable hysteretic behavior, their small thickness makes them prone to buckling, reducing strength and energy dissipation capacity. In this work, topology optimization using genetic algorithms is performed to find optimized shapes for structural fuses with …
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