The Impact of Change Orders on Mechanical Construction Labor Efficiency PDF Download
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Author: Paul Joseph Vandenberg
Publisher:
ISBN:
Category : Construction industry
Languages : en
Pages : 236
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Book Description
Change orders impact many areas of construction projects. However, the impacts that change orders have on labor efficiency are much harder to quantify and are, therefore, a significant risk to contractors. Little research has been completed in the past quantifying these impacts so that disputes are common between owners and contractors regarding the actual cost of change. This study uses data from 43 projects, 27 impacted by changes and 16 not impacted by changes, to develop a linear regression model that predicts the impact on labor efficiency. The input factors needed for the model are: (1) Total Actual Project Hours, (2) Total Estimated Change Hours, (3) Impact Classification, and (4) Timing of Change. Timing of Change is calculated by breaking the project schedule down into six periods (i.e., changes before construction start, 0 - 20%, 20 - 40%, 40 - 60%A, 60 - 80%, and 80 - 100%), listing the percentage of change that occurred in each period, and calculating a weighted timing factor. The model calculates the labor loss or gain in efficiency for a particular project so that owners and contractors will better understand the true change impact on labor efficiency. Significant results have been found in hypothesis testing. The results show that impacted projects have larger amounts of change, have a larger decrease in labor efficiency, and are more impacted by change that occurs later in the project schedule. These results appear to be consistent with the intuitive judgement of industry professionals. The research is limited to the mechanical trade, but does include specific work in plumbing, HVAC, process piping, and fire protection.
Author: Paul Joseph Vandenberg
Publisher:
ISBN:
Category : Construction industry
Languages : en
Pages : 236
Get Book Here
Book Description
Change orders impact many areas of construction projects. However, the impacts that change orders have on labor efficiency are much harder to quantify and are, therefore, a significant risk to contractors. Little research has been completed in the past quantifying these impacts so that disputes are common between owners and contractors regarding the actual cost of change. This study uses data from 43 projects, 27 impacted by changes and 16 not impacted by changes, to develop a linear regression model that predicts the impact on labor efficiency. The input factors needed for the model are: (1) Total Actual Project Hours, (2) Total Estimated Change Hours, (3) Impact Classification, and (4) Timing of Change. Timing of Change is calculated by breaking the project schedule down into six periods (i.e., changes before construction start, 0 - 20%, 20 - 40%, 40 - 60%A, 60 - 80%, and 80 - 100%), listing the percentage of change that occurred in each period, and calculating a weighted timing factor. The model calculates the labor loss or gain in efficiency for a particular project so that owners and contractors will better understand the true change impact on labor efficiency. Significant results have been found in hypothesis testing. The results show that impacted projects have larger amounts of change, have a larger decrease in labor efficiency, and are more impacted by change that occurs later in the project schedule. These results appear to be consistent with the intuitive judgement of industry professionals. The research is limited to the mechanical trade, but does include specific work in plumbing, HVAC, process piping, and fire protection.
Author: Timothy W. Gotzion
Publisher:
ISBN:
Category :
Languages : en
Pages : 288
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Book Description
Author: Matthew J. Bruggink
Publisher:
ISBN:
Category : Construction industry
Languages : en
Pages : 352
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Book Description
Author: David John Thomack
Publisher:
ISBN:
Category : Construction industry
Languages : en
Pages : 204
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Book Description
Author: William Schwartzkopf
Publisher: Wolters Kluwer
ISBN: 9780735514805
Category : Technology & Engineering
Languages : en
Pages : 488
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Book Description
Calculating construction damages can be complex and confusing. Written by recognized experts in the area of construction claims, Aspen Publishersand’ Calculating Construction Damages is a one-of-a-kind resource providing step-by-step guidelines for valuing a claim and calculating damages. Calculating Construction Damages keeps you completely up-to-date with the changes in the construction industry, and provides new and updated coverage on: Reductions in scope through deductive changes The meaning and explanation of acceleration The use of the actual cost method and the total cost method to calculate damages The effectiveness of expanding on productivity analysis. The definition of home office overhead costs and the use of the Eichleay formula. The most recent assessment of attorneysand’ fees on Miller Act claims Only Aspen Publishersand’ Calculating Construction Damages leads you through every step you need to take in order to reach an accurate assessment of construction damages. Complete coverage includes: General Principles of Damage Calculation Labor Costs Equipment and Small Tool Costs; Additional Equipment Costs Material Costs Bond and Insurance Costs Home Office Overhead Calculating Construction Damages is organized by type of damage rather than type of claim. Its clear, mathematical techniques will enable you to value any claim and accurately calculate damages.
Author: Chul-Ki Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
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Book Description
Author: Herbert Robinson
Publisher: John Wiley & Sons
ISBN: 1118944852
Category : Technology & Engineering
Languages : en
Pages : 432
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Book Description
The drive towards environmentally friendly buildings and infrastructure has led to a growing interest in providing design solutions underpinned by the core principles of sustainability to balance economic, social and environmental factors. Design Economics for the Built Environment: Impact of sustainability on project evaluation presents new directions, reflecting the need to recognise the impact of climate change and the importance of sustainability in project evaluation. The aim is to provide a new approach to understanding design economics in the context of the changing policy environment, legislative and regulatory framework, and increasing economic, environmental and social pressure as result of the sustainability agenda. The book follows a structured approach from theories and principles in the earlier chapters, to the practical applications and emerging techniques focusing on value and social, economic and environmental considerations in making design decisions. It starts with the policy context, building on various theories and principles such as, capital cost, value of design and resource-based theories, the new rules of measurement (NRM) to explore cost planning, the relationship between height and costs, key socio-economic and environmental variables for design appraisal, eco-cost/value ratio (EVR), whole life theory and the treatment of carbon emission as external costs, productivity and efficiency, fiscal drivers and legal framework for carbon reduction, procurement and allocation of risks in contracts. Case studies, practical examples and frameworks throughout reinforce theories and principles and relate them to current practice. The book is essential reading for postgraduate students in architecture, building and quantity surveying and is also a valuable resource for academics, consultants and policy-makers in the built environment.
Author: Peter W. G. Morris
Publisher: John Wiley & Sons
ISBN: 1118000277
Category : Technology & Engineering
Languages : en
Pages : 422
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Book Description
A complete guide to managing technical issues and procuring third-party resources The Wiley Guides to the Management of Projects address critical, need-to-know information that will help professionals successfully manage projects in most businesses and help students learn the best practices of the industry. They contain not only well-known and widely used basic project management practices but also the newest and most cutting-edge concepts in the broader theory and practice of managing projects. This fourth volume in the series offers expert guidance on the supply chain and delivery cycle of the project, as well as the technology management issues that are involved such as modeling, design, and verification. Technology within the context of the management of projects involves not so much actually doing the "technical" elements of the project as managing the processes and practices by which projects are transformed from concepts into actual entities-and doing this effectively within the time, cost, strategic, and other constraints on the project. The contributors to this volume, among the most recognized international leaders in the field, guide you through the key life-cycle issues that define the project, ensure its viability, manage requirements, and track changes-highlighting the key steps along the way in transforming and realizing the technical definition of the project. Complete your understanding of project management with these other books in The Wiley Guides to the Management of Projects series: * The Wiley Guide to Project Control * The Wiley Guide to Project, Program & Portfolio Management * The Wiley Guide to Project Organization & Project Management Competencies
Author: Franco Bontempi
Publisher: CRC Press
ISBN: 9789058096005
Category : Architecture
Languages : en
Pages : 978
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Book Description
Objective of conference is to define knowledge and technologies needed to design and develop project processes and to produce high-quality, competitive, environment- and consumer-friendly structures and constructed facilities. This goal is clearly related to the development and (re)-use of quality materials, to excellence in construction management and to reliable measurement and testing methods.
Author: Honglei Xu
Publisher: Springer Science & Business Media
ISBN: 9401780447
Category : Technology & Engineering
Languages : en
Pages : 321
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Book Description
This book presents recent advances in optimization and control methods with applications to industrial engineering and construction management. It consists of 15 chapters authored by recognized experts in a variety of fields including control and operation research, industrial engineering and project management. Topics include numerical methods in unconstrained optimization, robust optimal control problems, set splitting problems, optimum confidence interval analysis, a monitoring networks optimization survey, distributed fault detection, nonferrous industrial optimization approaches, neural networks in traffic flows, economic scheduling of CCHP systems, a project scheduling optimization survey, lean and agile construction project management, practical construction projects in Hong Kong, dynamic project management, production control in PC4P and target contracts optimization. The book offers a valuable reference work for scientists, engineers, researchers and practitioners in industrial engineering and construction management.
