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IMPACTS OF CONSTRUCTION RISKS ON COSTS IN LEED-CERTIFIED PROJECTS

Journal of Green Building 2016年第4期11卷 163-181页

作者： Asli Pelin Gurgun David Arditi Pablo Casals Vilar Department of Civil Engineering Yildiz Technical UniversityDavutpasa Campus34220IstanbulTurkey. Construction Engineering and Management Program Illinois Institute of TechnologyDepartment of CivilArchitectural and Environmental EngineeringAlumni Memorial HallRoom 229ChicagoIL 60616USA. Construction Engineering and Management Program Illinois Institute of TechnologyDepartment of CivilArchitectural and Environmental Engineering IL60616USA

Construction according to green principles rather than traditional methods poses a new set of risks to project *** risks should be appropriately identified and managed in order to prevent cost *** study aims to identify construction risks and their cost impacts in LEED-certified *** this purpose,thirteen risks were identified based on a literature survey and were categorized under four groups of issues:(i)consultant,contractor and subcon-tractor,(ii)material,product and process,(iii)legal,regulatory and contractual,and(iv)financial and economic.A survey was then administered to green build-ing design and construction practitioners in the *** assess the likelihood of occurrence of these risks and their respective impacts on project *** to the survey results,the risks associated with consultant,contractor and subcon-tractor issues have the highest expected impact on *** top five risk factors were determined as(1)contractors and subcontractors agreeing to standards that are not within their expertise and competence,(2)high cost of certification,(3)lack of expertise in new products/technologies,(4)doubts about the long-term viability and performance of new and untested products,materials and tech-nologies,and(5)inadequate definition of project parties’contractual roles and *** the cost impact of risks is of great value to owners and designers and *** the risks associated with LEED-certified projects and their cost impacts can be of benefit to all practitioners.

关键词： green construction LEED certification risk cost green risk management

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Parametric study of charging inlet diffuser performance in stratified chilled water storage tanks with radial diffusers: Part 1-model development and validation

Parametric study of charging inlet diffuser performance in s...

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2001 ASHRAE Annual Meeting

作者： Musser, Amy Bahnfleth, William P. Architectural Engineering Program University of Nebrask-Omaha Omaha NE United States

A computational fluid dynamics (CFD) model has been developed to simulate the flow and heat transfer near a lower radial inlet diffuser in a cylindrical stratified chilled water storage tank during charging. The model was used to perform parametric simulations of inlet diffuser performance in full-scale tanks during thermocline formation, from which first-order correlation relating thermal performance to tank and diffuser design parameters were derived Part I describes the development of the CFD model and its validation. Part 2 reports the results of the parametric study. The two-dimensional, transient model was implemented in a commercial finite element code. The model has been validated with field-measured data from two full-scale tanks. Laminar analysis predicted field-measured temperature profiles well, even under ostensibly transitional conditions, provided that variations in inlet temperature during the field tests were accurately modeled These results suggest that turbulence has a secondary effect on the development of thermoclines within the range of parameters considered and that laminar models may be useful for modeling performance of full-scale tanks over a wide range of inlet parameters. The fully developed temperature profile was found to be insensitive to the velocity distribution assumed at the inlet.

关键词： Water tanks

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Mechanisms of ice accumulation in a river bend-an experimental study

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International Journal of Sediment Research 2012年第4期27卷 521-537页

作者： Jun WANG Jue-yi SUI Hong-ya ZHANG Pang-pang CHEN Faye HIRSHFIELD School of Civil Engineering Hefei University of Technology Environmental Engineering Program University of Northern British Columbia Prince George Anhui Institute of Architectural and Industry Environmental Science Program University of Northern British Columbia Prince George

In this study,under conditions of different flow and ice discharge,extensive experiments have been carried out in a 180°-bend flume and an S-shaped bend *** phenomenon and mechanisms of ice accumulation in the bend channel have been *** accumulation along the convex bank was normally thicker than that along the concave *** maximum thickness of ice accumulation in the downstream bend channel occurred close to the convex *** difference between the maximum thickness and the minimum thickness of ice accumulation was *** entire ice accumulation became unstable if flow Froude number was *** the flow Froude Number is high,the entire ice accumulation becomes *** Froude Number between 0.035 and 0.060,the bottom surface of ice accumulation became waved in *** changes in Froude number and ice discharge rate can change a channel from a state of no ice accumulation to uniform accumulation over the channel *** higher the ice discharge,the more uniform the ice *** experimental results have been compared with field observations of ice jams at the Hequ Reach of the Yellow River.

关键词： 180°bend flume Frazil ice Ice jam or ice accumulation S-shape bend channel Thickness profile

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Evolution of a sustainability focused first-year environmental engineering course

Evolution of a sustainability focused first-year environment...

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2010 ASEE Annual Conference and Exposition

作者： Bielefeldt, Angela Environmental Engineering Program Department of Civil Environmental and Architectural Engineering University of Colorado Boulder United States

This paper presents ideas on methods to introduce sustainability to first year engineering students. The first year environmental engineering course that all majors are required to take at the University of Colorado at Boulder was modified in fall 2009 to emphasize sustainability. An understanding of sustainability is an important foundation for all engineering students. In addition, it was hypothesized that emphasizing sustainability and the global impacts of environmental engineering would be interesting and motivational to students. At the start of the second lecture in the course, students were given a 12-question in-class survey on sustainability. Students also responded to in-class questions during the two sustainability lectures in real time using a Course Response System (clickers). The new assignment specifically on sustainability required the students to read the Royal Academy of engineering's "engineering for Sustainable Development" report and part of the "Global Climate Change Impacts in the United States" document. The second new assignment required the students to assess and compare different biofuel options based on journal articles that had conducted life cycle assessments (LCA). This assignment proved particularly challenging for the students. The reflective essays that students wrote in the final assignment of the semester indicated that the new course content successfully raised their awareness of sustainability. However, modifications to the assignments are planned. © American Society for engineering Education, 2010.

关键词： Sustainable development

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Impact of applying electrocoagulation pre-treatment step on grey water treatment by submerged membrane bioreactor 85

Impact of applying electrocoagulation pre-treatment step on ...

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85th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2012

作者： Bani-Melhem, Khalid Smith, Edward Environmental Engineering Program Department of Construction and Architectural Engineering American University in Cairo Cairo11511 Egypt

ISBN: (纸本)9781510870437

Chemical coagulation is widely used for enhancing the performance of various water and wastewater treatment systems, including membrane filtration processes such as submerged membrane bioreactor (SMBR) units. However, the addition of chemicals to the wastewater may result in production of undesirable chemical by-products or increase the volume of sludge in the bioreactor. Alternatively, applying electrocoagulation (EC) technique has been shown to be a promising and novel approach in SMBR applications. In this study, the impact of applying EC step was investigated as a pretreatment stage for grey water treatment by SMBR system. The main objective of the present study was to investigate the performance of the integrated process of EC-SMBR under different voltage gradients. The performance of the integrated process of (EC-SMBR) was compared with the operation of a SMBR system operated alone. The comparison was achieved in two sequential operational phases in which two different voltage gradients were applied in the EC step. In both phases, aluminium electrodes were used. The results indicated that the EC unit can contribute in improving the SMBR performance if an adequate voltage gradient was applied in EC step. The improvement was observed clearly in Phase II when a voltage gradient of 1.26 V/cm was applied. Applying a low level of voltage gradient of 0.64 V/cm (Phase I) in EC step did not exhibit a significant improvement in pollutant removals. Copyright © 2012 Water Environment Federation. All Rights Reserved.

关键词： Membrane fouling

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Sustainability of heritage buildings reuse between competition and integration case study (Fuwwah and Rosetta)

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Journal of Umm Al-Qura University for engineering and Architecture 2024年第3期15卷 327-339页

作者： Elbelkasy, Mohamed Ibrahim Umm Al-Qura University Applied College Technical Architectural Engineering Program Makkah Saudi Arabia

Urban development in historic cities frequently faces the dilemma of balancing preserving cultural heritage with meeting economic competition and modernization requirements. This study investigates the long-term viability of repurposing heritage buildings in the urban areas of Fuwwah and Rosetta, Egypt. It specifically examines the intricate relationship between competition and integration in achieving sustainability. This study examines the present condition of heritage conservation in these cities by analyzing the factors that impact the sustainability of repurposing buildings and evaluating the effectiveness of strategies that balance the pressures of urban competition with the need to incorporate heritage into the changing urban environment. The research examines the practices and difficulties associated with repurposing heritage buildings in Fuwwah and Rosetta. Examine the economic, social, and environmental factors that impact the long-term viability of heritage preservation. Assess the equilibrium between urban development influenced by competition and the inclusive methods of repurposing heritage buildings. The research methodology comprises two approaches: the first involves conducting a literature review on heritage building reuse, sustainability in heritage conservation, and competition and integration in urban development. The analysis approach focuses on assessing heritage conservation in case studies by examining competition and integrating investment in heritage buildings. The ultimate goal is to draw conclusions and determine the results of these assessments. © The Author(s) 2024.

关键词： Heritage conservation Heritage sustainability Integrated development Investment heritage buildings

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The artificial sky laboratory at Oklahoma state university

The artificial sky laboratory at Oklahoma state university

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ASEE 2004 Annual Conference and Exposition, "engineering Researchs New Heights"

作者： Mansy, Khaled Oklahoma State University Architectural Engineering Program School of Architecture Oklahoma State University

The features of new artificial Sky laboratory at Oklahama State University are discussed. The new laboratory will help integrate the engineering of daylighting systems into the school's curriculum. The laboratory will also be an effective venue to integrate teaching and research. The existing tools currently being used in the USA to test daylighting scale models are also discussed. The specific outcome of this project is to make OSU' students, and consequently OSU' graduates to effectively incorporate daylighting system into the design of buildings, which should result in the conservation of energy used to operate buildings, and the mitigation of related negative environmental impacts.

关键词： engineering education

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Comparative safety risk analysis of highway construction work tasks

Comparative safety risk analysis of highway construction wor...

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Annual Conference of the Canadian Society for Civil engineering 2011, CSCE 2011

作者： Esmaeili, Behzad Hallowell, Matthew Pandey, Sangeeta Construction Engineering and Management Program Department of Civil Environmental and Architectural Engineering University of Colorado at Boulder United States

ISBN: (纸本)9781618392183

The construction industry is characterized by a relatively high injury and illness rate. Within the construction industry, the highway construction and maintenance sector is one of the most dangerous. Recent research has shown the importance of quantifying safety risks so that safety information can be objectively integrated into project design and construction planning. Despite its importance, only a few studies have attempted to and quantify safety risks for construction tasks. This paper describes the results of a Delphi study that aimed to quantify the relative unit safety risks for 25 highway construction tasks. Delphi experts have been selected based on rigorous requirements and various controls have been employed to decrease cognitive biases. The results indicate that "construction zone traffic control" and "install traffic control devices" are the highest risk highway construction tasks and "watering and dust palliatives" is the lowest risk task. Once obtained, the risk data were integrated with the safety schedule integration framework presented in the literature. This application of the data demonstrated the practical implications of the data and validated the risk integration framework. It is expected that the findings can be used by safety managers to improve job hazard analyses, prioritize resources, and increase the efficacy of existing schedule-based safety risk management tools.

关键词： Construction industry

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An integrative curriculum in architectural engineering technology

An integrative curriculum in architectural engineering techn...

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Davis, Daniel Fuller, James Petry, Elizabeth University of Hartford Arch. Engineering Technology Program University of Hartford Architectural Engineering Technology University of Hartford

In an effort to improve the architectural engineering Technology curriculum at the University of Hartford, educators and practitioners are working in collaboration. As design professionals, we are approaching the challenges of an integrative curriculum as we would an architectural design project. The goals of the 'new' design curriculum are to improve student learning through effective implementation of practice. The curriculum promotes critical thinking, problem solving skills, and creativity. Realistic issues are integrated into the design studios - real programs, real sites, cost estimating, and scheduling. We are integrating 'the basics' architectural history, architectural theory, drawing, and technical courses (such as structures and environmental systems) with design. In the design studio courses, we are attempting to find balance and connection, and increase the awareness of the interrelationships between these areas of study for the students. Faculty, practitioners, and students know that learning in a compartmental fashion has never been that successful. We look towards this new integrative design studio approach as a better way to prepare our students for the demands of professional life.

关键词： Curricula

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A study on development of real time monitoring system for field integrated management - Overall automation of steel construction

A study on development of real time monitoring system for fi...

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International Conference on Control, Automation and Systems, ICCAS 2007

作者： Hyun, Tae Ju Chi, Su Son Kyung, Hun Kim Kim, Kyung Hwan Kim, Jae Jun M.S Program Department of Sustainable Architectural Engineering Hanyang University Seoul Korea Republic of Department of Architectural Engineering Konkuk University Seoul Korea Republic of Department of Sustainable Architectural Engineering Hanyang University Seoul Korea Republic of

ISBN: (纸本)8995003871

Recently, Construction industry is mainly consisted with construction project that have become bigger, higher and construction industry is positively demanded with productivity security, competitive power improvement and so on. At these demand in construction industry, Organic management system is essential with Each field of project for big construction project. Construction industry demands an information-oriented tool of construction at construction industry that didn't smoothly progress Stream of generated various information at existing construction project for Organic management. Especially, Construction work management side is focused through using an information-oriented tool of construction and using visualized information is demanded for that. CAD among those is tried to use coordination environment tool that coordinate various work process, not just drawings tool. 4D model that is connected with schedule information by using 3D model information is utilized for many project. This paper will discuss how 4D model is connected with RFTD system that can get real time information for introducing real time progress management monitoring system at steel construction. And the paper introduces the how can use schedule information that is connected with real time input information. Last, The way of real time monitoring system that monitor construction information by using automated creation schedule information, 4D system and RFID system will be introduced. © ICROS.

关键词： Construction industry

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