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Now showing items 355-374 of 484

Qualitative assessment of interfacial bonding in 3D printing concrete exposed to frost attack

Assaad, Joseph Jean; Hamzeh, Farook R.; Hamad, Bilal S. (Elsevier Ltd, 2020)

The 3D printing technology is a novel construction process to build concrete structures layer-by-layer based on computer digital programs. The main objective of this research program is to develop a testing protocol that ...
Quantification of the inherent uncertainty in the relaxation modulus and creep compliance of asphalt mixes

Kassem, Hussein A.; Chehab, Ghassan R.; Najjar, Shadi S. (Springer Netherlands, 2018)

Advanced material characterization of asphalt concrete is essential for realistic and accurate performance prediction of flexible pavements. However, such characterization requires rigorous testing regimes that involve ...
Quantified traveler: Travel feedback meets the cloud to change behavior

Jariyasunant, Jerald; Abou-Zeid, Maya; Carrel, Andre L.; Ekambaram, Venkatesan Nallampatti; Gaker, David; Sengupta, Raja; Walker, Joan L. (Bellwether Publishing, Ltd., 2015)

We describe the design and evaluation of a system named Quantified Traveler (QT). QT is a computational travel feedback system. Travel feedback is an established programmatic method whereby travelers record travel in ...
Quantifying indoor PM2.5 levels and its sources in schools: What role does location, chalk use, and socioeconomic equity play ?

Alameddine, Ibrahim M.; Gebrael, K.; Hanna, Francis; El-Fadel, Mutasem E. (Elsevier B.V., 2022)

This study examines children's exposure to PM2.5 in the classroom environment of spatially and administratively distributed schools. For this purpose, we monitored PM2.5 levels inside and outside 40 classrooms in public ...
Quantifying the efficacy of diquat dibromide in controlling Microcystis aeruginosa and Aphanizomenon flos-aquae in comparison to copper sulfate and potassium permanganate

Dia, Sara; Alameddine, Ibrahim M.; El-Fadel, Mutasem E. (Royal Society of Chemistry, 2019)

Cyanobacterial harmful algal blooms (HABs) are an emerging problem worldwide, affecting many important freshwater systems. The use of chemical algaecides can provide an effective short-term mitigation measure to control ...
Rate-Dependent Behavior of Transverse Welded Lap Joints at Elevated Temperatures

El Ghor, Ahmad H.; Hantouche, Elie G.; Morovat, Mohammed Ali; Engelhardt, Michael D. (American Society of Civil Engineers (ASCE), 2021)

This paper presents key findings of an experimental program performed to examine the rate-dependent behavior of weld material in transverse welded lap joints at elevated temperatures under steady-state thermal conditions. ...
Rate-dependent thermal behavior of fillet welds subjected to various load angles

El Ghor, Ahmad H.; Hantouche, Elie G. (Elsevier Ltd, 2021)

The objective of this paper is to investigate the rate-dependent thermal behavior of fillet welds in welded lap joints subjected to different load angles. Performance of welds in fire is complex due to unexpected induced ...
Rational decision framework for designing pile-load test programs

Najjar, Shadi S.; Saad, George A.; Abdallah, Youmna (ASTM International, 2017)

There is currently an inconsistency in the recommendations that are available in pile-design codes and practices regarding the required number of proof-load tests and the level of the proof loads for piles. In this paper, ...
Re-evaluation and updating of the seismic hazard of Lebanon

Huijer, Carla; Harajlí, Mohamed H.; Sadek, Salah M. (Springer Netherlands, 2016)

This paper presents the results of a study undertaken to evaluate the implications of the newly mapped offshore Mount Lebanon Thrust (MLT) fault system on the seismic hazard of Lebanon and the current seismic zoning and ...
Reliability analysis of reinforced concrete slab bridges

Mahmoud, Ali; Najjar, Shadi S.; Mabsout, Mounir; Tarhini, Kassim M. (GEOMATE International Society, 2017)

Empirical expressions for estimating the wheel load distribution and live-load bending moment are typically specified in highway bridge codes such as the AASHTO procedures. The objective of this paper is to assess the ...
Reliability functions for buried submarine pipelines in clay subjected to upheaval buckling

Valle-Molina, Celestino; Alamilla, Jorge Luis; Sánchez-Moreno, Jorge; Najjar, Shadi S.; López-Acosta, Norma Patricia (Elsevier Ltd, 2014)

This paper presents the reliability analyses for studying and quantifying the variation of the reliability index (β) with the main parameters involved during the upheaval buckling of submarine buried pipes caused by high ...
Reliability of AASHTO LRFD parameters in multilane reinforced concrete slab bridges

Mahmood, Ali; Najjar, Shadi S.; Mabsout, Mounir; Tarhini, Kassim M. (IOS Press, 2019)

Empirical expressions for estimating live load bending moments are typically specified in AASHTO bridge codes. This paper will evaluate the reliability levels that are inherent in the simplified empirical equations in the ...
Reliability-based design of proof load test programs for foundations

Abdallah, Youmna; Najjar, Shadi S.; Saad, George A. (Southeast Asian Geotechnical Society, 2015)

There is currently an inconsistency in the recommendations that are available in pile design codes and practices regarding the required number of proof-load tests and the level of the proof loads. This paper presents the ...
Reliability-Based Design of Spatially Random Two-Layered Clayey Slopes

Jaber, Reem; Najjar, Shadi S.; Sadek, Salah M. (Springer Science and Business Media Deutschland GmbH, 2022)

Two-layered cohesive slopes are encountered in geotechnical applications involving embankments, dams, levees, and natural cut slopes. The reliability of two-layered slopes is highly affected by spatial variability in soil ...
Reliability-based design of spread footings on clays reinforced with aggregate piers

Kahiel, Ahmad; Najjar, Shadi S.; Sadek, Salah M. (Taylor and Francis Ltd., 2017)

The economical and safe design of footings supported on aggregate-pier-reinforced clay could benefit from the implementation of a reliability-based approach that incorporates the different sources of uncertainty. Monte ...
Reliability-based design of spread footings on fibre-reinforced clay

Abou Diab, Assile; Najjar, Shadi S.; Sadek, Salah M. (Taylor and Francis Ltd., 2018)

The potential use of fibres in a number of geotechnical engineering applications is gaining more interest in the geotechnical community. A select application consists of the improvement of soft grounds to mitigate their ...
Reliability-Based Structural Design of Retaining Walls Supporting Spatially Variable Soils

Tarhini, Batoul; Kahiel, Ahmad; Najjar, Shadi S.; Sadek, Salah M. (American Society of Civil Engineers (ASCE), 2022)

The performance of retaining walls is affected by spatial variability in the properties of the retained backfill. In practice, the conventional approach for designing retaining walls is deterministic and is based on ensuring ...
Removal of fouling species from brackish water reverse osmosis reject stream

Ayoub, Georges M.; Korban, Lea; Al-Hindi, Mahmoud; Zayyat, Ramez M. (Taylor and Francis Ltd., 2018)

Brine disposal from reverse osmosis (RO) systems remains a major challenge for the desalination industry especially in inland areas where discharge options are very limited. Solutions will entail the introduction of economic ...
Repair and FRP strengthening of earthquake-damaged RC shallow beam-column joints

Elsouri, Amer M.; Harajlí, Mohamed H. (Multi-Science Publishing Co. Ltd, 2015)

Three earthquake-resistant wide beam-column joint specimens (one interior, and two exterior) which developed beam plastic hinging mechanism and beam flexural failure under large drift reversals were repaired and FRP ...
Response of double angle and shear endplate connections at elevated temperatures

Hantouche, Elie G.; Sleiman, Sarah A. (Korean Society of Steel Construction, 2016)

Double angle and shear endplate connections are considered simple-beam end framing connections designed to carry gravity loads only. However, during a fire event, additional thermal induced axial forces might develop in ...

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Browsing Department of Civil and Environmental Engineering by Title

Browsing Department of Civil and Environmental Engineering by Title

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