Mitigation Controller: Adaptive Simulation Approach for Planning Control Measures in Large Construction Projects

2021 ◽  
Vol 147 (8) ◽  
pp. 04021093
Author(s):  
Omar Kammouh ◽  
Maria Nogal ◽  
Ruud Binnekamp ◽  
A. R. M. (Rogier) Wolfert
Keyword(s):  
Construction Projects ◽  
Control Measures ◽  
Simulation Approach ◽  
Adaptive Simulation

CAUSES AND EFFECTS OF VARIATIONS ON CONSTRUCTION PROJECTS

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Nishadi Jayawardena ◽  
Thanuja Ramachandra ◽  
James Rotimi
Keyword(s):  
Construction Projects ◽  
Residential Building ◽  
Weather Conditions ◽  
Control Measures ◽  
Sri Lankan ◽  
Building Projects ◽  
Type Size ◽  
Study Participants ◽  
Design Conflicts ◽  
The Relationship

Because of their bespoke nature, construction projects are susceptible to variations irrespective of type, size and complexity. The effects of these variations are significant and may include cost and time overrun, productivity, and waste issues at the minimum. Although variations have been widely researched, investigations into the relationship between the significant causes of variations and their effects have not. This study also considers control measures that could minimize variations in residential building projects, where significant variations are happening in the Sri Lankan construction industry. A questionnaire survey was administered to study participants with the objective of identifying significant causes and effects of variations on residential building projects. The participants were professionals across industry groups such as clients, consultants, and contractors who deal with variations on Sri Lankan construction projects. The study found that change in designs or project scope by owners or design consultants were due to owners’ financial problems, errors and omissions in design, conflicts between contract documents, inadequate working drawing details, lack of coordination by consultants, differing site conditions for contractors, unforeseen problems and weather conditions. Cost and time overruns are subsequent effects of those variations. The study suggests that variations could be minimized by adopting control measures that are appropriate for both the design and construction stage.

Factors leading to design changes in Jordanian construction projects

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lina Ghazi Gharaibeh ◽  
Sandra T. Matarneh ◽  
Mazen Arafeh ◽  
Ghaleb Sweis
Keyword(s):  
Construction Industry ◽  
Construction Projects ◽  
Control Measures ◽  
Value Engineering ◽  
Public And Private ◽  
Content Type ◽  
Factors Affecting ◽  
Construction Market ◽  
Design Changes ◽  
Major Factors

PurposeThe problem of design changes in the construction industry is common worldwide, and the Jordanian market is no exception. The purpose of this paper is to identify the factors causing design changes in construction projects in Jordan in both the public and private sectors. Furthermore, this research will examine the effect of these factors on project's performance during the construction phase.Design/methodology/approachThis research commences by identifying the factors causing design changes in construction projects worldwide through an intensive literature review. The identified factors were then filtered to those applicable to the Jordanian construction market based on the results obtained from a questionnaire survey and real case construction projects. In total, 252 professionals from the Jordanian construction industry and 10 completed and/or ongoing construction projects in different parts of Jordan were compared.FindingsThe results find that the top major factors affecting design changes are owner's requirements; design errors and omissions and value engineering. The research also studies and documents the impacts of design changes on project cost, schedule and quality.Originality/valueThe results obtained from this research will assist the construction professionals representing owners, consultants and contractors in applying control measures to minimize the occurrence of the identified factors causing design changes and to mitigate their sever impacts on projects in terms of cost, schedule and quality.

Common Quality Defects of Construction Projects and their Prevention

2012 ◽  
Vol 174-177 ◽  
pp. 3497-3500
Author(s):  
Wen Jing Wang
Keyword(s):  
Construction Projects ◽  
Raw Materials ◽  
Control Measures ◽  
Cause Analysis ◽  
The Common ◽  
Design Construction

In light of many complaints with regard to common quality defects of construction projects arising in recent years, this paper introduces the common quality defects, analyzes their characteristics, conducts cause analysis from such five aspects as design, construction, environment, raw materials and management and finally summarizes the control measures of quality defects of construction projects before, during and after the construction.

An adaptive simulation approach designed for tube hydroforming processes

2005 ◽  
Vol 159 (3) ◽  
pp. 303-310 ◽  
Author(s):  
A. Aydemir ◽  
J.H.P. de Vree ◽  
W.A.M. Brekelmans ◽  
M.G.D. Geers ◽  
W.H. Sillekens ◽  
...  
Keyword(s):  
Tube Hydroforming ◽  
Simulation Approach ◽  
Adaptive Simulation

scholarly journals A Comparative Study of Construction Waste Generation Rate Based on Different Construction Methods on Construction Project in Malaysia

2018 ◽  
Vol 8 (5) ◽  
pp. 3488-3491 ◽  
Author(s):  
H. Maniam ◽  
S. Nagapan ◽  
A. H. Abdullah ◽  
S. Subramaniam ◽  
S. Sohu
Keyword(s):  
Construction Projects ◽  
Indirect Measurement ◽  
Construction Method ◽  
Control Measures ◽  
Generation Rate ◽  
Waste Generation ◽  
Construction Waste ◽  
Construction Methods ◽  
A Value ◽  
Waste Generation Rate

High construction waste (CW) generation in Malaysia has serious impacts although there are very little available data regarding the relevant issue in Malaysia. This lack of data results in improper CW management and CW disposal without proper control measures. To control the implications of CW, it is very important to understand their quantity which is currently unknown. Past researches in Malaysia, found that CW generation was affected by construction methods (CMs) practiced on site. The aim of this study is to compare the CW generation rate between different CMs for on-going construction projects in Malaysia. Common CMs practiced in Malaysia are conventional construction method (CCM), mixed construction method (MCM) and industrialized building system (IBS). To obtain CW generation data, site visit (SV) method, which consists of direct measurement (DM) and indirect measurement (IM) is applied to this study. CCM was recorded to have the highest amount of waste (197.657 tons). IBS method records 77.188 tons and MCM 53.191 tons. Regarding the average waste generation rate (AWGR), IBS recorded a value of 0.018 tons per square meter, while MCM recorded 0.030 tons per square meter and CCM recorded the highest amount of 0.046 tons per square meter.

scholarly journals Identifying Effective Fugitive Dust Control Measures for Construction Projects in Korea

2018 ◽  
Vol 10 (4) ◽  
pp. 1206 ◽  
Author(s):  
Hyun-jun Noh ◽  
Seul-ki Lee ◽  
Jung-ho Yu
Keyword(s):  
Construction Projects ◽  
Dust Control ◽  
Control Measures ◽  
Fugitive Dust

Semi-Forward Adaptive Simulation Approach for Tube Hydroforming Loading Path Determination Using a Strain Trajectory Based Fuzzy Logic Control

2014 ◽  
Vol 598 ◽  
pp. 498-504 ◽  
Author(s):  
Ramil Kesvarakul ◽  
Thanasan Intarakumthornchai ◽  
Suwat Jirathearanat
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Control ◽  
Tube Hydroforming ◽  
Loading Path ◽  
Hydraulic Pressure ◽  
Simulation Approach ◽  
Time Step ◽  
Logic Control ◽  
Adaptive Simulation ◽  
Strain Trajectory

Tube hydroforming process is a well-established manufacturing process widely employed to form tubular parts that are lighter and stronger compared to those from stampings. Nevertheless, determination of process loading paths, i.e. axial feed distance versus hydraulic pressure, still typically relies on trial-and-error FEM approach. In this paper, a semi-forward adaptive simulation concept is proposed as an effective FEM approach, able to select a feasible THF loading path within a single FEM simulation run. The semi-forward adaptive simulation technique is based on the ability to “adapt” or adjust the loading path as to keep the forming strains within a preferred stain trajectory over the course of a simulation run. Forming strains at the current simulation time step are used as inputs to the fuzzy logic control; the output sets are then used to readjust the loading path for the current and next time steps. This semi-forward adaptive simulation scheme allows one to “correct” the loading path at the current time step as well as to better predict the forming strains in the next time step. It was found that the corrective and predictive nature of this semi-forward simulation approach coupled with the strain trajectory based fuzzy logic control scheme could handle a highly non-linear forming behavior of tube hydroforming processes effectively. In this work, a feasible loading path was determined thru only one simulation run for successful hydroforming of an eccentric bulged tubular part.

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