Theses and Dissertations from UMD

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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Zhang, Ruiyang

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    Structural performance evaluation and optimization through cyber-physical systems using substructure real-time hybrid simulation
    (2017) Zhang, Ruiyang; Phillips, Brian M; Civil Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Natural hazards continue to demonstrate the vulnerability of civil infrastructure worldwide. Engineers are dedicated to improving structural performance against natural hazards with improved design codes and computational tools. These improvements are often driven by experiments. Experimental testing not only enables the prediction of structural responses under those dynamic loads but also provide a reliable way to investigate new solutions for hazard mitigation. Common experimental techniques in structural engineering include quasi-static testing, shake table testing, and hybrid simulation. In recent years, real-time hybrid simulation (RTHS) has emerged as a powerful alternative to drive improvements in civil infrastructure as the entire structure’s dynamic performance is captured with reduced experimental requirements. In addition, RTHS provides an attractive opportunity to investigate the optimal performance of complex structures or components against multi-hazards by embedding it in an optimization framework. RTHS stands to accelerate advancements in civil engineering, in particular for designing new structural systems or devices in a performance-based design environment. This dissertation focuses on the use of cyber-physical systems (CPS) to evaluate structural performance and achieve optimal designs for seismic protection. This dissertation presents systematic studies on the development and validation of the dynamic substructuring RTHS technique using shake tables, novel techniques in increasing RTHS stability by introducing artificial damping to an under-actuated physical specimen, and the optimal design of the structure or supplemental control devices for seismic protection through a cyber-physical substructure optimization (CPSO) framework using substructure RTHS.
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    MULTIPLE ENERGY DISSIPATION STRATEGIES OF BASE ISOLATED STRUCTURES UNDER BLAST AND EARTHQUAKE
    (2014) Zhang, Ruiyang; Phillips, Brian M.; Civil Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Terrorist attacks have become a growing threat worldwide in recent years. Explosive devices, the weapon of choice for a majority of terrorist attacks, significantly threaten civilian and military personnel. Accordingly it is very important to protect critical buildings against blast loads with the main goal of preventing loss of life of the occupants. The research detailed within this dissertation will investigate innovative smart structures, including the mitigation of damage and loss of life under blast loading through base isolated structures combined with supplemental passive control devices without compromising the innate seismic protection that base isolation provides. The focus of this dissertation is the development and simulation of multiple control strategies for multi-story structures subjected to surface blasts and seismic excitations. The goal is to study and improve the response of base isolated structures under blast loadings and simultaneously keep the same level or better performance under earthquakes through alternative energy dissipation systems.