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- Earthquake (2)
- <p>Concrete bridges -- Foundations and piers<br />Columns (1)
- <p>Phytoremediation<br />Pollutants -- Analysis<br />Environmental toxicology</p> (1)
- <p>Reinforced concrete construction -- Earthquake effects<br />Concrete bridges -- Maintenance and repair<br />Columns (1)
- <p>Reinforced concrete construction<br />Concrete -- Fracture<br />Enamel and enameling<br />Coating processes</p> (1)
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- <p>Traffic safety -- Research -- Missouri<br />Traffic safety -- Missouri -- Statistical methods<br />Traffic accidents -- Missouri -- Statistical methods<br />Longitudinal method</p> (1)
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- Concrete -- Fatigue<br />Reinforced concrete construction<br />Earthquake engineering -- Research<br />Torsion</p> (1)
- Concrete -- Maintenance and repair<br />Torsion<br />Strength of materials -- Testing<br />Fiber-reinforced concrete</p> (1)
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- Fractured bars (1)
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- Interlocking spirals (1)
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Articles 1 - 5 of 5
Full-Text Articles in Engineering
Plant Uptake Of Environmental Contaminants: Applications In Phytoscreening, Matthew Alan Limmer
Plant Uptake Of Environmental Contaminants: Applications In Phytoscreening, Matthew Alan Limmer
Doctoral Dissertations
"Plants interact directly with their surroundings, extracting nutrients and water from the subsurface to support growth and development of the plant. Through the roots, plants also exude and uptake numerous chemicals. Many of the pathways can also be used by environmental contaminants to be translocated to above ground plant tissues. Such uptake of contaminants has proven useful in remediation and phytoscreening - the use of plants to delineate contaminant plumes. Sampling of trees at contaminated field sites has been used to identify areas of groundwater contaminated with a variety of chlorinated solvents. The use of plants as contaminant biosensors requires …
Seismic Repair Of Bridge Columns With Interlocking Spirals And Fractured Bars, Yang Yang
Seismic Repair Of Bridge Columns With Interlocking Spirals And Fractured Bars, Yang Yang
Doctoral Dissertations
"During earthquakes, reinforced concrete (RC) bridge columns may experience different levels of damage such as cracking, spalling, or crushing of concrete and yielding, buckling, or fracture of reinforcing bars. This study developed and assessed permanent and emergency methods to repair damaged bridge columns with fractured longitudinal reinforcement through experimental and modeling work. The permanent repair method involved replacement of the plastic hinge region by removal of spirals, replacement of longitudinal bar segments by mechanically splicing with new bars segments attached with mechanical couplers, replacement of concrete, and installation of an externally bonded carbon fiber reinforced polymer (CFRP) jacket. The emergency …
Longitudinal Analysis Of Crash Frequency Data, Mojtaba Ale Mohammadi
Longitudinal Analysis Of Crash Frequency Data, Mojtaba Ale Mohammadi
Doctoral Dissertations
"This study comprises mainly of three papers. First, a systematic evaluation of the effects of Missouri's Strategic Highway Safety Plan between 2004 and 2007 is presented. Negative binomial regression models were developed for the before-through-change conditions for the various collision types and crash severities. The models were used to predict the expected number of crashes assuming with and without the implementation of MSHSP. This procedure estimated significant reductions of 10% in crashes frequency and a 30% reduction for fatal crashes. Reductions in the number of different collision types were estimated to be 18-37%. The results suggest that the MSHSP was …
A Unified Bond Theory, Probabilistic Meso-Scale Modeling, And Experimental Validation Of Deformed Steel Rebar In Normal Strength Concrete, Chenglin Wu
Doctoral Dissertations
"Bond between deformed rebar and concrete is affected by rebar deformation pattern, concrete properties, concrete confinement, and rebar-concrete interfacial properties. Two distinct groups of bond models were traditionally developed based on the dominant effects of concrete splitting and near-interface shear-off failures. Their accuracy highly depended upon the test data sets selected in analysis and calibration. In this study, a unified bond model is proposed and developed based on an analogy to the indentation problem around the rib front of deformed rebar. This mechanics-based model can take into account the combined effect of concrete splitting and interface shear-off failures, resulting in …
Rapid Repair Of Severely Damaged Rc Columns Under Combined Loading Of Flexure, Shear, And Torsion With Externally Bonded Cfrp, Ruili He
Doctoral Dissertations
"This research aimed to develop a technique to rapidly repair reinforced concrete (RC) bridge columns for emergency service restoration after severe earthquake damage has occurred. Experimental and analytical studies were conducted to study the performance and effectiveness of the proposed repair method. The experimental study included a series of 1/2-scale RC square bridge columns originally tested to failure under constant axial and increasing cyclic lateral loadings resulting in combined flexure, shear, and torsion with different torsional-to-flexural moment ratios. Using externally bonded carbon fiber reinforced polymer (CFRP) sheets, each column was repaired over a 3-day period and then retested under the …