Geosynthetic Reinforced Fill Material for Tennessee Bridge Approach Slab Support

2021 ◽  
pp. 036119812110286
Author(s):  
Wadi H. Imseeh ◽  
Khalid A. Alshibli ◽  
Murad Y. Abu-Farsakh ◽  
Ted A. Kniazewycz
Keyword(s):  
Sudden Change ◽  
Fe Analysis ◽  
Strip Footing ◽  
Smooth Transition ◽  
Potential Hazard ◽  
Department Of Transportation ◽  
Geogrid Reinforcement ◽  
Approach Slab ◽  
Bearing Stress

The approach slab is constructed at bridge ends to serve as a smooth transition from the highway pavement to the bridge deck. However, motorists usually complain about a sudden change in elevation (bump) at the highway/approach slab (H/S) joint that causes a potential hazard for public safety, damage to vehicles, and rider discomfort. This paper develops a finite element (FE) analysis for the differential settlement at the H/S joint when supported by a strip footing that sits on compacted layers of soil embankment with uniaxial geogrid reinforcement. A parametric study was conducted to select the optimum design that consists of five geogrid layers equally spaced within a depth of 2 [Formula: see text] below the strip footing, where [Formula: see text] is the width of the footing. The inclusion of geogrid reinforcement did not only enhance the ultimate bearing stress of the strip footing but also redistributed the vertical loads over a wider region of soil embankment and thus reduced settlement. A case study is also presented for modeling the performance of a preliminary design proposed by Tennessee Department of Transportation (TDOT) for the retrofit of bridge ends. The FE analysis showed a 30%–40% improvement in the ultimate bearing stress of the strip footing when the geogrid reinforcement proposed by TDOT is extended to a depth of 1.5 [Formula: see text] below the footing.

Retrofit of Aerodynamic Cable Instability on a Cable-Stayed Bridge: Case Study

2000 ◽  
Vol 1740 (1) ◽  
pp. 61-67 ◽  
Author(s):  
Niket M. Telang ◽  
Charles M. Minervino ◽  
Paul G. Norton
Keyword(s):  
Large Amplitude ◽  
Weather Conditions ◽  
Mitigation Measures ◽  
Mobile Bay ◽  
Department Of Transportation ◽  
Light Rain ◽  
Wind Speeds ◽  
Cable Stays ◽  
Large Amplitude Vibrations

Elegantly poised over the Mobile River, the twin pylons and the semi-harped cable stays of the Cochrane Bridge subtly complement the vast and undulating landscape of the Mobile Bay as the bridge carries US Route 90 over the Mobile River in Alabama. In February 1998, light rain drizzled on the bridge, and a weather station nearby recorded wind speeds of about 48 km/h (30 mph). Under these seemingly mild weather conditions, the normally immobile cable stays started to vibrate, and within moments, these nascent vibrations reached amplitudes of more than 1.2 m (4 ft). Alarmed by this event, the Alabama Department of Transportation (ALDOT) took immediate action to ensure the continued safety and serviceability of the bridge. A team of consultants was selected by ALDOT to investigate mitigation measures for the large-amplitude cable-stay vibrations. The fast-tracked comprehensive program planned and implemented to inspect, test, document, and evaluate the effects of the large-amplitude vibrations and the recommendation of retrofit measures that would limit future occurrences of such cable-stay vibrations on the Cochrane Bridge are described in detail.

International benchmarking for performance improvement in construction safety and health

2016 ◽  
Vol 23 (4) ◽  
pp. 916-936 ◽  
Author(s):  
Lance W. Saunders ◽  
Andrew P McCoy ◽  
Brian M. Kleiner ◽  
Helen Lingard ◽  
Tracy Cooke ◽  
...  
Keyword(s):  
Qualitative Data ◽  
Construction Safety ◽  
Study Data ◽  
Worker Safety ◽  
Potential Hazard ◽  
Content Type ◽  
Safety And Health ◽  
The Usa ◽  
Project Lifecycle

Purpose – The purpose of this paper is to advance knowledge on the advantages of integrating safety earlier in the construction project lifecycle. Design/methodology/approach – A case study approach is used to collect data from construction sites in the USA, which performs poorly in construction safety and health, and Australia (AU), which performs well in construction safety and health. Qualitative data are collected to determine how and when safety is considered in the project lifecycle in both countries, and then the results are benchmarked to determine the benefits of addressing safety earlier in the process. Findings – Data show that addressing a potential hazard earlier in the project lifecycle has performance benefits in terms of the level of hazard control. Research limitations/implications – The processes that are identified as possibly explaining the performance difference are just based on qualitative data from interviews. Targeted research addressing the relationship between these processes and safety outcomes is an opportunity for further research. Practical implications – The case study data are used to identify specific processes that are used in AU that might be adopted in the USA to improve performance by integrating safety earlier into the decision-making process. Social implications – This paper highlights the advantages of integrating safety as a decision factor early in the process. Worker safety is not just an issue in the construction industry, and thus the findings are applicable to all industries in which worker safety is an issue. Originality/value – This paper advances the safety in design literature by quantitatively supporting the link between when a hazard is addressed and performance. It also links the results to specific processes across countries, which advances the literature because most research in this area to data is within a single country.

On the Supra‐LUMO Interaction: Case Study of a Sudden Change of Electronic Structure as a Functional Emergence

2021 ◽  
Author(s):  
Philippe Lainé ◽  
Alexis Gosset ◽  
Štěpánka Nováková Lachmanová ◽  
Sawsen Cherraben ◽  
Gildas Bertho ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Sudden Change

scholarly journals Structural Redundancy Assessment of Adjacent Precast Concrete Box-Beam Bridges in Service

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yanling Leng ◽  
Jinquan Zhang ◽  
Ruinian Jiang ◽  
Yangjian Xiao
Keyword(s):  
Precast Concrete ◽  
Fe Analysis ◽  
Load Testing ◽  
Structural Redundancy ◽  
Simplified Approach ◽  
Box Beam ◽  
Nonlinear Fe Analysis ◽  
Redundancy Level ◽  
Real Behavior

Present approaches for assessing bridge redundancy are mainly based on nonlinear finite element (FE) analysis. Unfortunately, the real behavior of bridges in the nonlinear range is difficult to evaluate and a sound basis for the nonlinear FE analysis is not available. In addition, a nonlinear FE analysis is not feasible for practitioners to use. To tackle this problem, a new simplified approach based on linear FE analysis and field load testing is introduced in this paper to address the particular structural feature and topology of adjacent precast concrete box-beam bridges for the assessment of structural redundancy. The approach was first experimentally analyzed on a model bridge and then validated by a case study. The approach agrees well with the existing recognized method while reducing the computation complexity and improving the reliability. The analysis reveals that the level of redundancy of the bridge in the case study does not meet the recommended standard, indicating that the system factor recommended by the current bridge evaluation code for this bridge is inappropriate if considering the field condition. Further research on the redundancy level of this type of bridges is consequently recommended.

scholarly journals Hydropower Future: Between Climate Change, Renewable Deployment, Carbon and Fuel Prices

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1197 ◽  
Author(s):  
Alessandro Ranzani ◽  
Mattia Bonato ◽  
Epari Patro ◽  
Ludovic Gaudard ◽  
Carlo De Michele
Keyword(s):  
Climate Change ◽  
Multidisciplinary Approach ◽  
Decision Makers ◽  
Smooth Transition ◽  
Hydropower Plant ◽  
Distributed Hydrological Model ◽  
Fuel Prices ◽  
New Energy ◽  
The Right

Hydropower represents an interesting technology: affordable, renewable, and flexible. However, it must cope with climate changes and new energy policies that jeopardize its future. A smooth transition to sustainability requires decision makers to assess the future perspectives of hydropower: about its future revenue and related uncertainty. This investigation requires a multidisciplinary approach as both streamflow and energy mix will evolve. We simulated future streamflow based on eight climate scenarios using a semi-distributed hydrological model for our case study, the Tremorgio hydropower plant located in southern Switzerland. Next, using a hydropower management model we generated income according to these streamflows and twenty-eight electricity price scenarios. Our results indicate that climate change will modify the seasonality of inflows and volumes exploitable for hydropower generation. However, adaptive strategies in the management of reservoirs could minimize revenue losses/maximize revenue gains. In addition, most market scenarios project an increase in revenues, except in the case of high wind and solar energy penetration. Markets do not provide the right incentive, since the deployment of intermittent energy would benefit from more flexible hydropower.

The responsibilities of the project owner in benefits realization

2019 ◽  
Vol 39 (4) ◽  
pp. 503-524 ◽  
Author(s):  
Ofer Zwikael ◽  
Jack R. Meredith ◽  
John Smyrk
Keyword(s):  
Smooth Transition ◽  
Future Research ◽  
Senior Executives ◽  
Longitudinal Case Study ◽  
Content Type ◽  
Benefits Realization ◽  
Project Phases ◽  
The Individual

Purpose Recent research has proposed the position of a project owner as the individual accountable for realizing target benefits. However, there is a lack of understanding in the literature of this role – in particular, the specific responsibilities of the project owner that can enhance benefits realization and operations performance. The paper aims to discuss this issue. Design/methodology/approach The paper identifies these responsibilities in practice through two studies – a qualitative study, which includes interviews with senior executives who fund projects, and an in-depth longitudinal case study, which describes a company that continuously realizes the benefits from its projects. Findings The results suggest that a project owner should have 22 key responsibilities across four project phases and that an operations manager is often the most suitable candidate to fulfill this role in operations improvement projects. When performing these project responsibilities effectively, operations managers enhance benefits realization and operations improvement. Finally, the paper proposes five hypotheses for future research. Originality/value Based on agency theory, the paper increases our knowledge of the role of the project owner in practice. This new knowledge can enhance the realization of target benefits from projects and ensure a smooth transition from the project to the operations environment.

scholarly journals FE Analysis Of Meniscus Injury In A Square Stance Tennis Forehand Drive-a Case Study

2020 ◽  
Vol 52 (7S) ◽  
pp. 88-89
Author(s):  
Jingqiu Zhou ◽  
Hesheng Song ◽  
Jingguang Qian ◽  
Yu Liu ◽  
Hongwei Jiang ◽  
...  
Keyword(s):  
Fe Analysis ◽  
Meniscus Injury
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