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 54 for “"civil structures"”.
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Smart wireless control of civil structures
… are an alternative approach to protect structures from natural hazards that continue to plague our nation’s infrastructure. Due to their onboard sensing, communication, and computational capabilities, wireless smart sensors, which have become popular for structural health monitoring …
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Active, Regenerative Control of Civil Structures
… for the mitigation of earthquake disturbances in civil structures. A proof-mass actuator is a machine which accelerates a mass along a linear path. Such actuators can facilitate two-way power flow. In regenerative force actuation, a bi- directional power-electronic drive is used to facilitate …
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Use of sensors in monitoring civil structures
… use of sensors and sensor networks in monitoring civil structures, with particular emphasis on the monitoring of bridges and highways using fiber optic sensors. Following a brief review of the most widespread form of civil infrastructure inspection -- visual inspection -- the thesis describes the …
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Optical fiber sensors for advanced civil structures
… quantitative evaluation of advanced civil structures. Based on a comparative evaluation of optical fiber sensors that may be used to obtain quantitative information related to physical perturbations in the civil structure, the extrinsic Fabry-Perot interferometric (EFPI) optical fiber …
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Regenerative electric actuators for active control of civil structures
… the motion caused by environmental forces on a civil structure to generate electrical energy when the structure's response is within safety limits. When strong winds and earthquakes occur, the utility power source which supply energy to the actuator in an active control system is usually not …
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Interferometric optical fibre sensor for highway pavements and civil structures
Optical fibres have been used for developing variety of sensing configurations for monitoring a wide range of parameters. This thesis presents the design, construction and characterisation of a new type of single-transducer optical fibre Weigh-ln-Motion (WIM) sensor. The sensor is based on an …
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Active and Semi-Active Control of Civil Structures under Seismic Excitation
… is on the active and semi-active control of civil engineering structures subjected to seismic excitations. Among different candidate control strategies, the sliding mode control approach emerges as a convenient alternative, because of its superb robustness under parametric and input …
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Develop Sonic Infrared Imaging Nde For Local Damage Assessment In Civil Structures
… characterization of materials, tissues and structures. Ultrasonic IR Imaging is a novel NDE technique, which combines a short ultrasonic pulse excitation and infrared imaging to detect defects in materials and structures. In this technique, a sound pulse with a frequency in the range of …
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Development of Electromagnetic Friction Dampers for Improving Seismic Performance of Civil Structures
… dissipation is critical to limiting damage to civil structures subjected to extreme natural events such as earthquakes. Friction is one of the most reliable mechanisms of energy dissipation that has been utilized extensively in friction dampers to improve seismic performance of civil …
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Study of a Modified Friction Device for the control of civil structures
… can be used to dissipate this energy in a civil structure. In this research, a new semi-active dissipation device is studied: the Modified Friction Device (MFD). The MFD is a control device that consists of a spring, a viscous element and a braking element similar to car brakes. Because it …
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Approximation algorithms for rapid evaluation and optimization of architectural and civil structures
… modelling, in the early-stage design of structures. The use of approximation models to evaluate design performance scores rapidly could lead to a more in-depth exploration of a design space and its trade-offs and also aid in reducing the computation time of optimization algorithms. Six …
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Algorithmic Optimization of Sensor Placement on Civil Structures for Fault Detection and Isolation
… DDI have been used for decades on critical infrastructures, but the advancements in computational power, instrumentation, and wireless communication and high bandwidth have enabled evolutionary development in structural health monitoring. Structural health monitoring (SHM), in its infancy, meant …
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A Physically Informed Data-Driven Approach to Analyze Human Induced Vibration in Civil Structures
… assumptions oversimplify phenomena present in civil structures such as: attenuation, reflections, and dispersion. A series of experimental and theoretical investigations show that three common assumptions made in VBOI algorithms are unable to account for at least one of these phenomena, leading …
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Design and Calibration of a RF Capacitance Probe for Non-Destructive Evaluation of Civil Structures
Portland cement concrete (PCC) structures deteriorate with age and need to be maintained or replaced. Early detection of deterioration in PCC (e.g., alkali-silica reaction, freeze/thaw damage, or chloride presence) can lead to significant reductions in maintenance costs. However, it is often too …
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Assessment of seismic damage to civil structures using statistical pattern recognition techniques and time series analysis
The ability to estimate seismic induced damage to civil infrastructure is undoubtedly one of the most important challenges faced by structural engineers. In this research two complementary methods of damage estimation using either knowledge of the structure and earthquake or recorded structural …
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Global Dynamic Characterization and Load Rating of Bridge Structures Utilizing Economical Dynamic Excitation Devices
… modal analysis (EMA) of bridges and other civil structures can be used to acquire quantitative data describing their condition, and enhance opportunities for structural health monitoring and related fields. The use of EMA on civil structures has been limited by the high cost of the …
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Wind flow characteristics of multi-vortex tornadoes and their wind effects on residential houses
… the built environment, and the performance of civil structures during tornadoes. In the past, the wind effects caused by single-vortex tornadoes have been widely studied, while the multi-vortex tornadoes were rarely considered. In fact, many previous deadly, costly tornadoes involved multiple …
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Rolling-Ball Rubber-Layer system for the lightweight structures seismic protection: experimentation and numerical analyses
… are not a mere extension of the ones used for civil structures, although the basic theories and concepts of seismic isolation are the same. Indeed, the following technical peculiarities have to be considered: the contents have masses orders of magnitude smaller than those characteristic of …
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Dynamic impact induced by tornadoes through simulations based on two-way wind-structure interactions
… of tornadoes and their wind effects on civil structures, based on which design tornadic wind loading can be properly determined. To achieve this, in this study, Computational Fluid Dynamics (CFD) simulations and Computational Structural Dynamics (CSD) simulations are combined for the …
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Theory of Decision Based on Structural Health Monitoring
… is becoming higher and higher. Many of these structures need inspection, maintenance or replacement, resulting in significant costs. The accurate estimate of structural condition can make operators optimize the allocation of resources. Nowadays, the progress of technology and machine learning …
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