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- Dielectrophoresis (2)
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Articles 1 - 11 of 11
Full-Text Articles in Civil Engineering
Performance Of Frp-Retrofitted Concrete Bridge Columns Under Blast Loading, R. Zheng, P. Zohrevand, H. Erdogan, Amir Mirmiran
Performance Of Frp-Retrofitted Concrete Bridge Columns Under Blast Loading, R. Zheng, P. Zohrevand, H. Erdogan, Amir Mirmiran
Civil Engineering Faculty Publications and Presentations
Contrary to military or essential government buildings, most bridges are designed without any consideration for blast resistance. Fiber-reinforced polymers (FRPs) can provide an effective means for strengthening of critical bridges against such loading. This study has focused on the effectiveness of FRP retrofitting in the dynamic response of reinforced concrete bridge columns under blast loading. Using a simplified equivalent I-section with a virtual material lumped at the two flanges; a lightly meshed uniaxial finite element model was developed and successfully validated against previous studies. The proposed model was then used for a thorough parametric study on the blast resistance of …
Predictive Models For Earthquake Response Of Clay And Sensitive Clay Slopes, Amir M. Kaynia, Gokhan Saygili
Predictive Models For Earthquake Response Of Clay And Sensitive Clay Slopes, Amir M. Kaynia, Gokhan Saygili
Civil Engineering Faculty Publications and Presentations
Earthquake-induced permanent displacement and shear strain are suitable indicators in assessing the seismic stability of slopes. In this paper, predictive models for the permanent displacement and shear strain as functions of the characteristics of the slope (e.g. factor of safety) and the ground motion (e.g. peak ground acceleration) are proposed. The predicted models are based on numerical simulations of seismic response of infinite slopes with realistic soil profiles and geometry parameters. Predictive models are developed for clay and sensitive clay slopes. A strain-softening soil model is used for sensitive clays. A comparison of the permanent displacement and strain predictions for …
Strength And Stiffness Characterization Of Controlled Low-Strength Material Using Native High-Plasticity Clay, Bhaskar Chittoori, Anand J. Puppala, Anil Raavi
Strength And Stiffness Characterization Of Controlled Low-Strength Material Using Native High-Plasticity Clay, Bhaskar Chittoori, Anand J. Puppala, Anil Raavi
Civil Engineering Faculty Publications and Presentations
A research attempt was made to design a controlled low-strength material (CLSM) mix that can be used as bedding and haunch material for a pipeline by using the native soil as fine aggregate. Several CLSM mix designs were attempted using native high-plasticity clay as fine aggregate material. Comprehensive material characterization studies including flowability to strength tests were performed. These results were analyzed to address the applicability of each mix to serve as pipe bedding/backfilling zones in a pipeline construction. Both flowability and density test results are first evaluated, and as a result, several mixes are formulated. These mixes were further …
Durability Studies On Native Soil-Based Controlled Low Strength Materials, Bhaskar Chittoori
Durability Studies On Native Soil-Based Controlled Low Strength Materials, Bhaskar Chittoori
Civil Engineering Faculty Publications and Presentations
The Integrated Pipeline Project (IPL) is a collaborative effort between the Tarrant Regional Water District (TRWD) and Dallas Water Utilities (DWU), which bring additional water supplies to the Dallas / Fort Worth area. As part of a sustainability initiative, several studies were conducted to assess the reuse potential of excavated materials along the IPL project. One of these studies involved using the excavated material as an ingredient in Controlled Low Strength Material, often known as CLSM or flowable fill. This flowable fill can be used as bedding and haunch material in pipeline construction. These CLSMs meet the specifications in the …
Study Of Mechanisms Governing Electromagnetic Alteration Of Hydraulic Conductivity Of Soils, Atena Najafi, Sahba Azad, Arvin Farid, Jim Browning, Elisa Barney Smith
Study Of Mechanisms Governing Electromagnetic Alteration Of Hydraulic Conductivity Of Soils, Atena Najafi, Sahba Azad, Arvin Farid, Jim Browning, Elisa Barney Smith
Civil Engineering Faculty Publications and Presentations
Hydraulic conductivity is a measure of the rate at which water flows through porous media. Because of the dipole properties of water molecules, electric field can affect hydraulic conductivity. In this study, the effect of radio-frequency (RF) waves on hydraulic conductivity is investigated. This is important both for the geophysical measurement of hydraulic conductivity as well as remediation using electromagnetic waves. Bentonite clay and sandy samples are tested in rigid-wall, cylindrical permeameters and stimulated using a CPVC-cased monopole antenna vertically centered in the permeameters. The permeameters are encased within RF cavities constructed of aluminum mesh in order to prevent interference …
Laboratory Study Of The Effect Of Electromagnetic Waves On Airflow During Air Sparging, Atena Najafi, Vahab Bolvardi, Arvin Farid, Jim Browning, Elisa Barney Smith
Laboratory Study Of The Effect Of Electromagnetic Waves On Airflow During Air Sparging, Atena Najafi, Vahab Bolvardi, Arvin Farid, Jim Browning, Elisa Barney Smith
Civil Engineering Faculty Publications and Presentations
Air sparging is a technique that uses the injection of a gas (e.g., air, oxygen) into the subsurface to remediate saturated soils and groundwater contaminated with volatile organic compounds (VOCs). Contaminant-removal efficiency and air-sparging performance are highly dependent on the pattern and type of airflow. Airflow, however, suffers from air channel formation (i.e., preferential paths for airflow), limiting remediation to smaller contaminated zones. This paper presents the results of experimental work investigating the possibility of controlling and improving airflow patterns through a saturated glass-bead medium using electromagnetic (EM) waves to enhance air sparging. The test setup consists of a resonant …
Electromagnetically Induced Transport In Water For Geoenvironmental Applications, Arvin Farid, Atena Najafi, Mahsa Azad, Jim Browning, Elisa Barney Smith
Electromagnetically Induced Transport In Water For Geoenvironmental Applications, Arvin Farid, Atena Najafi, Mahsa Azad, Jim Browning, Elisa Barney Smith
Civil Engineering Faculty Publications and Presentations
Air sparging is a popular soil remediation technique that enables the removal of contaminants through diffusing air into soil. The removal process is, however, slow. The goal of this work is to study the effect of electromagnetic (EM) waves —with minimal heat generation— on transport mechanisms such as diffusion, in order to improve airflow or contaminant transport in order to expedite the cleanup process using air sparging or similar technologies. This effect is studied through an experimental setup that examines the diffusion of a nonreactive dye in water under EM waves at a range of frequencies (50-200 MHz). The electric …
The Stochastic Capacity Of A Roadway: Is It The Answer For Better “Real-Time” Management Of Freeway Operations?, Mandar Khanal
The Stochastic Capacity Of A Roadway: Is It The Answer For Better “Real-Time” Management Of Freeway Operations?, Mandar Khanal
Civil Engineering Faculty Publications and Presentations
Rapid growth in vehicles has been observed in many developing countries in recent years. The number of vehicles has grown but non-motorized vehicles have not disappeared. The presence of dissimilar modes of travel results in unsafe roads. Additional factors that exacerbate the traffic problem in these countries are the tendency of users to not observe traffic rules and the lax enforcement of traffic rules by law enforcement agencies. The combination of these factors can be deadly for road users. For example in India, a total of 134,513 people lost their lives to road accidents in 2010 compared to 32,885 road …
Swell And Shrinkage Strain Prediction Models For Expansive Clays, Anand J. Puppala, Thammanoon Manosuthikij, Bhaskar C. S. Chittoori
Swell And Shrinkage Strain Prediction Models For Expansive Clays, Anand J. Puppala, Thammanoon Manosuthikij, Bhaskar C. S. Chittoori
Civil Engineering Faculty Publications and Presentations
A comprehensive laboratory investigation was conducted to study volume change behaviors of five different types of expansive clayey soils sampled from various regions in Texas, USA. The laboratory test results, which were presented in an earlier paper, are analyzed here to evaluate existing correlations that can be used to predict swell and shrink-related displacements in these soils. The test database is also used to develop newer and practical models for predicting volume change-related soil properties. Models developed here used soil plasticity and compaction properties as independent variables. Newer models, that rely on seasonal compaction moisture content variations in the subsoils, …
Adaptive Traffic Speed Estimation, Brian Portugais, Mandar Khanal
Adaptive Traffic Speed Estimation, Brian Portugais, Mandar Khanal
Civil Engineering Faculty Publications and Presentations
Active traffic management aims to dynamically manage congestion based on existing and predicted traffic conditions. A challenge in this is that it is not usually possible to process data in real-time and use the output in control algorithms or in traveler information systems. A solution to this is to predict the traffic state based on assessments of current and past measurements. The work described in this paper develops an adaptive forecasting method to predict traffic speeds using dynamic linear models with Bayesian inference from a priori distributions. This study incorporates speeds collected from radar based sensors and validates the results …
Increasing The Durability Of Piezoelectric Impact-Based Micro Wind Generator In Real Application, Hyun Jun Jung, Yooseob Song, Seong Kwang Hong, Chan Ho Yang, Sung Joo Hwang, Tae Hyun Sung
Increasing The Durability Of Piezoelectric Impact-Based Micro Wind Generator In Real Application, Hyun Jun Jung, Yooseob Song, Seong Kwang Hong, Chan Ho Yang, Sung Joo Hwang, Tae Hyun Sung
Civil Engineering Faculty Publications and Presentations
The purpose of this study is to increase the durability of piezoelectric impact-based micro wind generator (PIMWG) in real application. Using new PIMWG design, numerical simulation, and experimental comparison analysis, we improved the durability of PIMWGs in real application. The experimental results show that the optimized PIMWG generated 2.4 mW (RMS value), and it did not crack within 40 h. In this study, we improved the durability of PIMWGs for real application.