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 “"Seismic Retrofit"”.
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Seismic retrofit of precast panel buildings in Eastern Europe
… explores the effectiveness of global bracing seismic mitigation techniques on an existing precast panel building located in Sofia, Bulgaria. The in-situ building is first analyzed using SAP2000 and then again after the bracing is added to the model. A variety of parameters such as drift, floor …
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Dynamic Analysis and Seismic Retrofit of the Point Sur Lighthouse
… to return to its original setting but the seismic performance of the building must first be assessed in order to ensure the safety of the lens and lighthouse, specifically the out-of-plane behavior of the unreinforced masonry walls, the implementation of possible seismic retrofit schemes, …
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Unreinforced Masonry Precincts in New Zealand: History, Heritage, and Seismic Retrofit
… examining New Zealand’s history, heritage, and seismic retrofit of URM precincts. Heritage conservation through seismic retrofit demands analysis of architectural and structural seismic design principles. The thesis examines the application of contemporary conservation theory through selected …
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Seismic retrofit of existing reinforced concrete moment resisting frame structures using diagonal prestressing
… to structural engineering and more specifically seismic response has continued to evolve through research and field investigations. Recently, the 2005 NBCC has been made available with a new perspective on seismic design, including uniform hazard spectra provided for each city for static and …
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A Design Approach for Seismic Retrofit of Circular Bridge Columns With Lap Splices
… the influence of the bar orientation in the retrofitting of the columns, and to assess the different retrofitting techniques. Eight half size models were built with characteristics similar to the field columns, #11 bar sizes and thirty diameter (1.09 m (43 in.)) lap splice lengths, in order …
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Optimization of timber-based strengthening techniques for the seismic retrofit of existing masonry buildings
… of various timber-based solutions for the seismic and energy retrofit of unreinforced masonry (URM) buildings considering various case scenarios and evaluating both the mechanical and the energetic performance of the intervention. Timber engineered products were employed as base components …
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Seismic retrofit and repair of reinforced concrete bridge columns using shape memory alloy spirals
… use of shape memory alloy (SMA) spirals in the seismic retrofitting and repair of reinforced concrete (RC) bridge columns. The thermally triggered recovery stress of prestrained SMA spirals is utilized to apply large active confinement pressure at the column’s plastic hinge zone to enhance the …
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Performance-based seismic retrofit (PBSR) methodology for multi-story buildings with full-scale experimental validation
… designed prior to the implementation of modern seismic design codes. Although building codes have clearly evolved, the problem is still unresolved for older buildings that are code-deficient such as soft-story wood-frame buildings. Many retrofit procedures have been proposed by the research and …
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An integrated VE damping and FRP strengthening system for performance-based seismic retrofit of RC columns
… is proposed to enable a cost- effective retrofitting design of reinforced concrete (RC) columns for multiple performances objectives. This methodology involves the integration of viscoelastic (VE) damping layers and fiber reinforced polymer (FRP) strengthening sheets into one compact …
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Seismic Loss Assessment and Mitigation of Critical Urban Infrastructure Systems
This study develops an approach for estimating seismic performance of complex critical urban infrastructures and optimizing seismic retrofit of infrastructure systems based on system-level performance under the constraint of finite resources. First, postearthquake system performance of …
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Seismic vulnerability assessment of off-ramp structures of the Las Vegas downtown viaduct
… to a strong earthquake were determined using the seismic provisions of the current bridge design codes. In the third stage, non-linear three dimensional finite element models of the off ramp bridges were used to simulate the seismic response of the off-ramp structures to the Sylmar and the ATC …
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Interface durability of externally bonded GFRP to normal and high-performance concrete
… (GFRP) fabrics are being increasingly used for seismic retrofit and rehabilitation of concrete structures. Glass fibers exhibit high strength to weight ratio and low cost in comparison to carbon and aramid fibers. However, previous studies have shown that glass fibers are vulnerable to attack …
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Seismic Rehabilitation of Steel Concentrically Braced Frames Vulnerable to Soft-Story Failure Through Implementation of Rocking Cores
… focuses on development and validation of a seismic retrofit strategy for low-rise and mid-rise steel CBFs vulnerable to soft-story failures. The considered retrofit strategy consists of a sufficiently stiff rocking core (RC) pinned to foundation and connected to the existing frame. For …
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Seismic Rehabilitation of Steel Moment Frames Vulnerable to Soft-Story Failures Through Implementation of Rocking Cores
<p>During seismic events, inefficient steel moment frame building systems may exhibit soft-story failures. This thesis focuses on development and validation of a seismic retrofit strategy for avoiding soft-story failures in low-rise and mid-rise steel moment frame buildings. The considered retrofit …
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Performance of shape memory alloy rehabilitated bridge columns under sequential earthquakes
… effect (SME) demonstrated a great potential in retrofitting and/or repairing seismically deficient RC bridge columns. In order to gain recognition as an effective seismic retrofit/repair strategy and systemize its application, however, it is necessary to thoroughly study the unique behavior of …
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Design and Installation of Ultra-High Performance Fiber Reinforced Precast Jackets for Retrofitting Concrete Piers
… last decade as a new alternative material for retrofitting reinforced concrete structures such as buildings and bridges. One of the most common applications of UHPFRC today is restoring bridge decks and construction joints. UHPFRC can also be applied to the retrofit of principal structural …
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Performance of C-Shaped structural concrete walls subjected to bi-directional loading
… mid-rise buildings in regions of low and high seismicity. Wall geometries in buildings are generally complex configurations to accommodate architectural constraints during new construction or existing conditions in seismic retrofit applications. A typical configuration for seismic regions is …
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Seismic Vulnerability Assessment of As-Built and Retrofitted Multi-Frame Box-Girder Bridges
… In this case, deck unseating is expected if the seismically induced displacements are excessively large. The second case occurs when the two adjacent frames move towards each other. In this case the span pounding can cause localized damage and collisions between two adjacent frames and also …
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Seismic site response of deep soil and embankments in the New Madrid Seismic Zone
… This is to be accomplished by developing new seismic design and assessment methodologies, by improving seismic retrofitting measures, and by exchanging and transferring new technologies. Four major tasks were conducted in this study: characterization of typical sites in the NMSZ, free field …
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Timber shear walls for a sustainable build future
… to bear the effects of horizontal loads like seismic events or wind. This thesis deals with timber shear walls, and is divided into two parts: the first part is related to the ultimate and serviceability limit states rules to be included in upcoming versions of the building codes, while the …
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