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Selecting a delay analysis method in resolving construction claims

International Journal of Project Management 2006年第2期24卷 145-155页

作者： Arditi, David Pattanakitchamroon, Thanat Department of Civil and Architectural Engineering Illinois Institute of Technology Construction Engineering and Management Program 3201 South Dearborn Street Chicago IL 60616 United States

Delays occur commonly in construction projects. Assessing the impact of delay is sometimes a contentious issue. Several delay analysis methods are available but no one method can be universally used over another in all situations. The selection of the proper analysis method depends upon a variety of factors including information available, time of analysis, capabilities of the methodology, and time, funds and effort allocated to the analysis. The paper reviews 20 research studies that discuss various aspects of delay analysis methods and summarizes the advantages and disadvantages of widely used delay analysis methods, including the as-planned vs. as-built, impact as-planned, collapsed as-built, and time impact analysis methods. The paper also discusses the most important issues in delay analysis that affect the results of the analysis. The selection of a suitable analysis method depends heavily on the availability of scheduling data, the familiarity of the analyst with the capabilities of the software used in the project, clear specifications in the contract concerning the treatment of concurrent delays and the ownership of float. © 2005 Elsevier Ltd and IPMA. All rights reserved.

关键词： Project management

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Effect of learning on line-of-balance scheduling

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International Journal of Project Management 2001年第5期19卷 265-277页

作者： Arditi, David Tokdemir, Onur Behzat Suh, Kangsuk Department of Civil and Architectural Engineering Construction Engineering and Management Program Illinois Institute of Technology 3201 South Dearborn Street Chicago IL 60616 United States

An approach to formulate learning rates and include them in line-of-balance (LOB) calculations is proposed in this paper. Learning rates are generated by modifying historical learning rates of typical construction activities and by incorporating the impact of relevant factors such as, number of operations in one unit, activity complexity, and job and management conditions. Fuzzy set theory is used to develop production rules to treat both factual and uncertain information. An S-type membership function is used to interpret the fuzzy data and produce adjustment factors that are in turn used to modify consecutive learning rates, until an adjusted learning rate is obtained. The adjusted learning rate is then used to calculate expected worker-hours and activity durations at each unit of production (e.g., a floor in a high-rise building, a mile of pavement work, etc.). A final LOB diagram is generated using this information. Different pairs of curves represent the start and the finish times of each activity in sets of units that make use of different numbers of crews. Learning reduces project duration and resource requirements. The proposed approach demonstrates the potential for formalizing the inclusion of learning effects into the LOB scheduling of repetitive-unit construction. © 2001 Elsevier Science Ltd and IPMA. All rights reserved.

关键词： Project management

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Meteorological data implications modeling on evapotranspiration variability in arid and semi-arid zones in Saudi Arabia using hybrid metaheuristic

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Scientific Reports 2025年第1期15卷 1-22页

作者： Noureddine, Oulad Naoui Mohamed, Sekkoum El Amine, Cherif Alzaed, Ali Gedfew, Meseret Abeje Ghoneim, Sherif S. M. Hussein, Enas E. Materials Energy Systems Technology and Environment Laboratory Department of Hydraulic and Civil Engineering University Ghardaia Bounoura Algeria Department of Civil Engineering Faculty of Civil Engineering and Architecture Amar Telidji University P. O. Box 37.G Laghouat 03000 Algeria Water Management and Treatment Laboratory University of Science and Technology of Oran Mohamed Boudiaf B.P. 1505 El M’Naouer Oran Algeria Architectural Engineering Program - Civil Engineering Department Faculty of Engineering Taif University Taif 21944 Saudi Arabia Department of Civil Engineering Faculty of Technology Debre Markos University P. O. Box 269 Debre Markos Ethiopia Department of Electrical Engineering College of Engineering Taif University Taif 21944 Saudi Arabia Water Management Research Institute National Water Research Center Shubra El-Kheima 13411 Egypt

This work is unique and contributes new knowledge to the field whereas it involves introducing a new method based on coupling two or three stochastic models, analyzing new data represented by drought and flooding risk relationship, and addressing a previously unexplored research question: Can we make a decision regarding future evapotranspiration-flooding risk relationship? In this paper, the Bat algorithm (BAT) with the Newton Method (NM), Bird Swarm Algorithm (BSA), Genetic Algorithm (GA), and Chicken Swarm Optimization Algorithm (CSO) are used as a hybrid model in arid and semi-arid zones in Saudi Arabia as well as for modeling rainfall, temperature, and solar radiation implications on evapotranspiration variability. Coupling between aridity and evapotranspiration over a long time can create flooding risks. This holistic modeling aims to reduce flooding risks and ensure the desired decision. Several models were employed to simulate some basins’ Potential and Actual evapotranspiration as case studies. The meteorological inputs of the hybrid models were calibrated and validated with metric evaluation for input and output of evapotranspiration, respectively. The results suggest that the application of a hybrid model can improve the accuracy of evapotranspiration simulations in terms of statistical parameters, whereas BAT–GA–NM reduced MAPE from 38.88 to 4.16% for Mekkah and from 14.94 to 2.04% for Medina and NSCE from − 0.17 to 0.97 for Mekkah and from 0.82 to 0.99%. Those parameters will provide a better understanding of evapotranspiration processes in watersheds and valuable information for early warnings of flooding risks. © The Author(s) 2025.

关键词： Evapotranspiration Hybrid metaheuristic Modeling Rainfall Solar radiation data Temperature

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IMPACTS OF CONSTRUCTION RISKS ON COSTS IN LEED-CERTIFIED PROJECTS

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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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