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 24 for “"Bridge Columns"”.
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Seismic Performance of Self-Consolidating Concrete Bridge Columns
… performance of self-consolidating concrete (SCC) bridge columns. This study included literature review, experimental evaluation of concrete mixtures, experimental testing of reinforced concrete bridge columns under combined axial loading and lateral load reversals, and analytical evaluation of …
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Innovative techniques for seismic-resistant bridge columns under ground motion excitations
… for replacing conventional reinforced concrete columns. The proposed columns displayed enhanced seismic resistance and properties compared to their counterpart conventional columns. Two main techniques were followed and proposed to develop seismic-resistant columns. The first technique utilized …
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Performance of RC Bridge Columns under Cyclic Combined Loading including Torsion
Reinforced concrete (RC) bridge columns, specifically in the skewed and horizontally curved bridges, the bridges with unequal spans or column heights, and the bridges with outrigger bents, can be subjected to cyclic combined loading including axial, flexure, shear, and torsion loads during …
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Performance of shape memory alloy rehabilitated bridge columns under sequential earthquakes
… 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 this new material and its impact on the performance of …
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Effect of Severe Corrosion on Lateral Strength of Square RC Bridge Columns
… results in drop in the lateral strength of columns. Therefore, studying response of corroded reinforced concrete columns subjected to lateral loads is necessary.</p> <p>According to the Federal Highway Administration (FHWA) report in 2013, 25.9 percent of the total inventory of highway …
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Seismic behavior of circular reinforced concrete bridge columns under combined loading including torsion
"Reinforced concrete (RC) columns of skewed and curved bridges with unequal spans and column heights can be subjected to combined loading including axial, flexure, shear, and torsion loads during earthquakes. The combination of axial loads, shear force, and flexural and torsional moments can result …
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A Design Approach for Seismic Retrofit of Circular Bridge Columns With Lap Splices
… in the reinforcement details for the field columns the correlation was not obvious. Therefore, a laboratory investigation was undertaken in order to study the optimal amount of lateral confinement necessary to avoid a lap splice failure, the influence of the bar orientation in the …
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Behavior of hollow-core fiber reinforced polymer-concrete-steel bridge columns under extreme loading
… fiber reinforced polymer-concrete-steel (HC-FCS) bridge columns under extreme loading. The HC-FCS column consists of a concrete wall sandwiched between an outer fiber reinforced polymer (FRP) tube and an inner steel tube. The steel tube was embedded into a reinforced concrete footing with an …
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Seismic retrofit and repair of reinforced concrete bridge columns using shape memory alloy spirals
… 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 flexural ductility of vulnerable columns and limit their …
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Probabilistic seismic demand models of RC bridge columns retrofitted with shape memory alloy spirals
The breakdown of critical bridge infrastructure in past earthquakes has often been attributed to the failure of reinforced concrete (RC) bridge columns due to lack of flexural ductility. Despite the revision of structural design standards to accommodate the lessons learned from these earthquakes, a …
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Post-Earthquake Damage Repair and Probabilistic Damage Control Approach for Reinforced Concrete Bridges
… approach (PDCA) for reinforced concrete (RC) bridges. To develop repair methods, first repair objectives were defined. To define repair objectives, internal earthquake damage was quantified and correlated to a series of visible damage states (DSs). Bridge columns are designed to be the primary …
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Post-seismic response and repair of earthquake-damaged reinforced concrete bridges
“In bridge structures, column members are typically designed to be the primary source of energy dissipation during an earthquake. Therefore, reinforced concrete (RC) bridges that are damaged in an earthquake tend to have damage to the column members. While many studies have been conducted on …
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Seismic behavior of bridge pier column lap splices
… and ductility, or shear strength, of concrete bridge columns have resulted in collapse or severe damage of a number of California bridges in recent moderate earth-quakes. In general, these bridges were designed prior to the new seismic design methods which were implemented in the mid-seventies. …
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Seismic vulnerability assessment of off-ramp structures of the Las Vegas downtown viaduct
… moment, shear and deformation capacities of the columns were determined by moment-curvature analysis. Then, the existing design of the bridge columns was compared to the requirements of the current bridge design codes. In the second stage, the moment, shear and deformation demands on the columns …
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APPLICATION OF MULTI-HAZARD SEISMIC-BLAST DETAILING FOR HIGHWAY BRIDGES
… nation’s transportation infrastructure. Highway bridges are an attractive target for terrorist attacks due to ease of accessibility and their overall importance to society. The primary objective of this research is to investigate multi-hazard seismic-blast correlations of blast-induced bridge …
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Seismic Assessment of RC Structures Considering Vertical Ground Motion
… the effect of vertical ground motion. FHWA Bridge systems selected from the previously completed analysis was used during full hybrid simulations designed to realistically represent the loading experienced by bridge columns during earthquakes. The horizontal ground motion was used as the …
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Nondestructive evaluation of FRP composite members using infrared thermography
… cracks, debonding, and delaminations in concrete bridge decks and pavements and in some configurations of FRP decks has been studied earlier by other researchers. These earlier studies have yielded reasonably satisfactory results though further refinement of the methodology and improvements in the …
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Behavior of reinforced concrete column-beam joint subjected to close in blast loads with polyurea and FRP sheets
… experimental contact-explosion tests on RC bridge columns (Yuan et al., 2017) achieving close agreement in peak accelerations and damage profiles. Complementary boundary conditions and measurement locations from related studies further improved model fidelity. Mesh convergence was confirmed …
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Seismic Performance of Column-to-Drilled-Shaft Connections in Reinforced Concrete Bridges
… are often used to support reinforced concrete bridge columns founded in soft soils or in locations where a small footprint is desired. Increasingly, the shaft is being built with a diameter larger than that of the column, to allow tolerance in the column placement and to facilitate plastic …
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Non-Contact Lap Splices in Geometrically Dissimilar Bridge Column to Drilled Shaft Connections
… irregularity for the connection of non-circular bridge columns interfacing directly with circular drilled shafts. However, there is a concern on the safety and cost-effectiveness of such non-contact lap splices because the guidelines in the current AASHTO LRFD code and studies on this type of …
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