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Articles 1 - 16 of 16
Full-Text Articles in Architectural Engineering
Performance Of Reinforced Concrete Wall With Discrete Frp Boundary Element Retrofit, Katelyn Lowry, Roger Biddle, Peter Laursen, Anahid A. Behrouzi, Cole Mcdaniel
Performance Of Reinforced Concrete Wall With Discrete Frp Boundary Element Retrofit, Katelyn Lowry, Roger Biddle, Peter Laursen, Anahid A. Behrouzi, Cole Mcdaniel
Architectural Engineering
This paper presents experimental results for a lightly reinforced concrete (LRC) shear wall retrofitted with discrete fiber-reinforced polymer (FRP) strips at the boundary zones. The performance of this wall was evaluated through cyclic lateral load testing and compared with a wall retrofitted with continuous FRP at the boundary zones (Duong et al., 2024). Test results showed that the wall retrofitted with discrete strips exhibited a flexural tensile failure characterized by wide flexural cracks confined between FRP strips and rebar fracture at high drifts, while maintaining displacement compatibility and axial load capacity beyond strength degradation. Compared to the continuous FRP retrofit, …
Teaching The Equivalent Rectangular Stress Block, J. Chris Carroll, Ben Dymond, Anahid Behrouzi
Teaching The Equivalent Rectangular Stress Block, J. Chris Carroll, Ben Dymond, Anahid Behrouzi
Architectural Engineering
The equivalent rectangular stress block is the basis for determining the flexural strength of reinforced concrete members. Instructors commonly present the concept in two dimensions, contrary to its three-dimensional nature. Unfortunately, this can be particularly difficult for students to understand and visualize, especially for students with visual learning style preferences. This paper presents an overview of the equivalent rectangular stress block, select active learning methods, and four specific examples used by the authors to introduce the equivalent rectangular stress block in an undergraduate reinforced concrete design course. The first method focuses on understanding the terms associated with the equivalent rectangular …
Active And Visual Methods For Teaching Nonrectangular Reinforced Concrete Beams, J.Chris Carroll, Anahid Behrouzi, Karl F. Meyer
Active And Visual Methods For Teaching Nonrectangular Reinforced Concrete Beams, J.Chris Carroll, Anahid Behrouzi, Karl F. Meyer
Architectural Engineering
Nonrectangular cross sections are a common occurrence in reinforced concrete design typically taking the form of flanged beam sections, circular columns, and square or rectangular columns subject to biaxial bending. Instructors typically introduce the theory behind nonrectangular beams using two-dimensional sketches of flanged sections. Students can struggle to visualize the examples when presented in two dimensions; deciphering the multiple resultant compressive forces and their corresponding moment arms are particularly difficult. This paper presents an overview of nonrectangular beam theory and select active learning methods along with three specific examples used by the authors to teach nonrectangular beams in an undergraduate …
Wavelet Power And Shannon Entropy Applied To Acoustic Emission Signals For Corrosion Detection And Evaluation Of Reinforced Concrete, Jinrui Zhang, Ziye Kang, Dongshuai Hou, Biqin Dong, Hongyan Ma
Wavelet Power And Shannon Entropy Applied To Acoustic Emission Signals For Corrosion Detection And Evaluation Of Reinforced Concrete, Jinrui Zhang, Ziye Kang, Dongshuai Hou, Biqin Dong, Hongyan Ma
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Acoustic emission (AE) signals detected from corrosion test on a steel reinforced concrete beam subjected to the coupling effects of corrosive wet-dry cycles and static load are analyzed by power spectral density, wavelet transform, and Shannon entropy. The degradation process of the corroded reinforced concrete beam can be divided into four stages on the basis of the accumulated event number (AEN). Due to the difference of material properties, steel reinforcement and concrete matrix have distinguished AE features. The time-frequency characteristics of AE signals can reflect the microstructural degradation mechanism of steel corrosion and concrete cracking. The corrosion evaluation entails investigating …
Comparison Between Precast And Cast-In-Place Reinforced Concrete Structures In Mexico City, Santiago Rodriguez Sanchez
Comparison Between Precast And Cast-In-Place Reinforced Concrete Structures In Mexico City, Santiago Rodriguez Sanchez
International Programs
Both Precast and Cast-in-place reinforced concrete structures have its own advantages and disadvantages. However, Precast RC structures have more advantages than Cast-in-place RC structures. Furthermore, it has been found that, under seismic loads, Precast structures can behave similar to Cast-in-place ones. Therefore Precast structures are an optimal option in Mexico City.
Observations About The Seismic Response Of Rc Buildings In Mexico City, Sergio Alcocer, Anahid A. Behrouzi, Sergio Brena, Kenneth J. Elwood, Ayhan Irfanoglu, Michael Kreger, Rémy Lequesne, Gilberto Mosqueda, Santiago Pujol, Aishwarya Puranam, Mario Rodriguez, Prateek Shah, Andreas Stavridis, Richard Wood
Observations About The Seismic Response Of Rc Buildings In Mexico City, Sergio Alcocer, Anahid A. Behrouzi, Sergio Brena, Kenneth J. Elwood, Ayhan Irfanoglu, Michael Kreger, Rémy Lequesne, Gilberto Mosqueda, Santiago Pujol, Aishwarya Puranam, Mario Rodriguez, Prateek Shah, Andreas Stavridis, Richard Wood
Architectural Engineering
Over 2000 buildings were surveyed by members of the Colegio de Ingenieros (CICM) and Sociedad Mexicana de Ingenieria Estructural (SMIE) in Mexico City following the Puebla-Morelos Earthquake of 2017. This inventory of surveyed buildings included nearly 40 collapses and over 600 buildings deemed to have structural damage. Correlation of damage with peak ground acceleration (PGA), peak ground velocity (PGV), predominant spectral period, building location, and building properties including height, estimated stiffness, and presence of walls or retrofits was investigated for the surveyed buildings. The evidence available suggests that (1) ground motion intensity (PGV) drove the occurrence of damage and (2) …
Impact Of Bi-Directional Loading On The Seismic Performance Of C-Shaped Piers Of Core Walls, Anahid A. Behrouzi, Andrew W. Mock, Dawn E. Lehman, Laura N. Lowes, Daniel A. Kuchma
Impact Of Bi-Directional Loading On The Seismic Performance Of C-Shaped Piers Of Core Walls, Anahid A. Behrouzi, Andrew W. Mock, Dawn E. Lehman, Laura N. Lowes, Daniel A. Kuchma
Architectural Engineering
Reinforced concrete structural walls are commonly used as the primary lateral load resisting system in modern buildings constructed in high seismic regions. Most walls in high-rise buildings are C-shaped to accommodate elevators or other architectural features. C-shaped walls have complex loading and response including: (1) symmetric response in the direction of the web, (2) asymmetric response in the direction of the flange and (3) high compression and shear demands when used as a pier in a coupled-wall configuration. A research study was conducted on C-shaped walls tested under (1) uni-directional and (2) bi-directional loading of an isolated walls and (3) …
Physical Models In The Reinforced Concrete Design Classroom, Anahid A. Behrouzi
Physical Models In The Reinforced Concrete Design Classroom, Anahid A. Behrouzi
Architectural Engineering
An overview is presented of various physical demonstration tools intended to supplement lectures in topic areas that students consistently identify as being troublesome. The article describes the design, fabrication, and implementation of classroom models to help explain flexural behavior and detailing of beams, slabs, and frame systems.
Shear Strength Of Chemically Based Self-Consolidating Concrete Beams: Fracture Mechanics Approach Versus Modified Compression Field Theory, Mahdi Arezoumandi, Jeffery S. Volz
Shear Strength Of Chemically Based Self-Consolidating Concrete Beams: Fracture Mechanics Approach Versus Modified Compression Field Theory, Mahdi Arezoumandi, Jeffery S. Volz
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
An experimental investigation was conducted to study the shear strength of full-scale beams constructed with both chemically based self-consolidating concrete (SCC) and conventional concrete (CC). This experimental program consisted of 12 beams without stirrups with three different longitudinal reinforcement ratios. The beams were tested under a simply supported four-point loading condition. The experimental shear strengths of the beams were compared with the shear provisions of both U.S. and international design codes. Furthermore, the shear strengths of the beams were evaluated based on fracture mechanics approaches, modified compression field theory (MCFT), and a shear database of CC specimens. Results of this …
Development Of Long Carbon Fiber-Reinforced Concrete For Dynamic Strengthening, Zahra S. Tabatabaei, Jeffery S. Volz, Benjamin P. Gliha, Darwin I. Keener
Development Of Long Carbon Fiber-Reinforced Concrete For Dynamic Strengthening, Zahra S. Tabatabaei, Jeffery S. Volz, Benjamin P. Gliha, Darwin I. Keener
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This paper discusses the development and testing of long carbon fibers-fibers 75 mm long or longer-to improve the resistance of reinforced concrete to dynamic loading, such as blasts and impact. In the past, attempts to use long fibers in concrete have failed as a result of both balling (agglomeration) and poor dispersion of the fibers. In the present study, two types of long carbon fibers were developed and optimized for their use in reinforced concrete. The resulting long carbon fiber-reinforced concrete (LCFRC) was subsequently evaluated through impact and blast testing. Full-scale blast testing revealed that these fibers significantly increased the …
Flexural And Shear Behavior Of Reinforced Concrete Members Strengthened With A Discrete Fiber-Reinforced Polyurea System, Courtney E. Greene, John J. Myers
Flexural And Shear Behavior Of Reinforced Concrete Members Strengthened With A Discrete Fiber-Reinforced Polyurea System, Courtney E. Greene, John J. Myers
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Recent research has been conducted to evaluate the benefits provided by externally applied discrete fiber-reinforced polyurea (DFRP) coating systems. This coating was proposed to allow for ease of construction in repair-retrofit situations and to provide multihazard benefits, ranging from blast or impact fragmentation mitigation to seismic reinforcement and general strengthening. This phase of research investigated the flexural and shear reinforcement capabilities of the systems. Testing parameters included type of structural failure, polyurea, and fiber volume fraction. Additionally, the effects of the thickness of the composite system were considered. Concrete beam specimens were fabricated and coated per the designed test matrix …
Model For Reinforced Concrete Members Under Torsion, Bending, And Shear. Ii: Model Application And Validation, Gary Greene, Abdeldjelil Belarbi
Model For Reinforced Concrete Members Under Torsion, Bending, And Shear. Ii: Model Application And Validation, Gary Greene, Abdeldjelil Belarbi
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A model was recently proposed for predicting the load-deformation response of a reinforced concrete member under torsion combined with bending and shear to spalling or ultimate. This paper shows the application of the model to create interaction surfaces to predict the failure of a member subjected to different ratios of applied torsion, bending, and shear. the model was validated by comparing the predicted and experimental behavior of 28 members from three experimental studies available in the literature. the members were loaded under torsion combined with different ratios of bending, and shear. the torque-twist behavior, reinforcement stress, and concrete surface strain …
Model For Reinforced Concrete Members Under Torsion, Bending, And Shear. I: Theory, Gary Greene, Abdeldjelil Belarbi
Model For Reinforced Concrete Members Under Torsion, Bending, And Shear. I: Theory, Gary Greene, Abdeldjelil Belarbi
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A model has been developed that can predict the load-deformation response of a reinforced concrete (RC) member subjected to torsion combined with bending and shear to spalling or ultimate capacity. the model can also be used to create interaction surfaces to predict the failure of a member subjected to different ratios of applied torsion, bending, and shear. the model idealizes the sides of a reinforced concrete member as shear "wall panels." the applied loads are distributed to the wall panels as uniform normal stresses and uniform shear stresses. the shear stress due to an applied torsional moment and shear force …
Damage Characterization Of Beam-Column Joints Reinforced With Gfrp Under Reversed Cyclic Loading, Aly M. Said
Damage Characterization Of Beam-Column Joints Reinforced With Gfrp Under Reversed Cyclic Loading, Aly M. Said
Civil and Environmental Engineering and Construction Faculty Research
The use of fiber reinforced polymer (FRP) reinforcement in concrete structures has been on the rise due to its advantages over conventional steel reinforcement such as corrosion. Reinforcing steel corrosion has been the primary cause of deterioration of reinforced concrete (RC) structures, resulting in tremendous annual repair costs. One application of FRP reinforcement to be further explored is its use in RC frames. Nonetheless, due to FRP's inherently elastic behavior, FRP-reinforced (FRP-RC) members exhibit low ductility and energy dissipation as well as different damage mechanisms. Furthermore, current design standards for FRP-RC structures do not address seismic design in which the …
Overview Of The Japanese Guidelines For Seismic Retrofitting Of Rc Columns Using Frp Materials, Gustavo Tumialan, Hiroshi Fukuyama, Antonio Nanni
Overview Of The Japanese Guidelines For Seismic Retrofitting Of Rc Columns Using Frp Materials, Gustavo Tumialan, Hiroshi Fukuyama, Antonio Nanni
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The increasing uses of FRP materials for the strengthening and upgrade of buildings has motivated the international engineering community to produce guidelines for the proper design, handling and installation of the externally bonded FRP systems. Thus, independent efforts coordinated by different organizations such as the Japan Building Disaster Prevention Association (JBDPA) and the American Concrete Institute (ACI) have led to implementing appropriate provisions. the JBDPA guidelines mainly focus on seismic retrofitting of structural elements, which implies the strengthening for shear of deficient structural elements. This paper describes and comments on some of the design approaches provided by the JBDPA guidelines …
North American Design Guidelines For Concrete Reinforcement And Strengthening Using Frp: Principles, Applications And Unresolved Issues, Antonio Nanni
North American Design Guidelines For Concrete Reinforcement And Strengthening Using Frp: Principles, Applications And Unresolved Issues, Antonio Nanni
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This paper reports on the North American state-of-the-art in the use of FRP composites in concrete structures. for new construction, FRP bars have been used as the internal reinforcement in concrete members to replace conventional steel rebars for a host of reasons. the principles for design and construction have been established and proposed to industry by the American Concrete Institute (ACI). for repair and upgrade, strengthening of concrete members with externally bonded FRP laminates or near surface mounted (NSM) bars has received remarkable attention. the design and construction principles for use in practice are being finalized by ACI. on the …