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Delay Hierarchy Propagation Model

2005

Construction projects are always exposed to delay. Research has shown that most projects encounter delays and this problem is a global one. Previous research related to delays in construction projects have been dedicated to measuring and ranking the direct delays that have occurred. These types of delay are past delays and have already affected many aspects of the project's performance. This type of research is of the reactive type and handles delays after they have happened. The objective of this research is to model the construction project delays that can be used to predict the level of delays that the project could face during its future life. The proposed Delay Hierarchy Propagation Model (DHPM) is the first attempt to model delays in the construction project. This model is an innovative predictive approach to anticipate the future encountered delays before they become real. The model assumes that the direct delay is generated from earlier events or aspects that are found before the direct delay occurs; these events are called the root delay causes. These root delay causes need to be analysed, measured and managed in order to prevent or mitigate the effect of a later direct delay in the project life. The direct delays were analysed by a cause-effect technique to extract a set of root delay causes. The model assumes that the root delay causes will influence the project resources supply rate. The resource shortage then leads to activity delay and, hence possible delay to the whole project. The DHPM consists of two interrelated models: a Resource Shortage Possibility (RSP) model and the Predicting Project Delay model (PPD) model. The RSP model objective is to predict the possibility of resource shortage, whilst the PPD model objectives are to predict the project finish time and to define the critical areas for the project to delay using the output of the RSP model as input.

DELAY ANALYSIS IN CONSTRUCTION PROJECT

IRJMETS Publication, 2021

The building industry's struggle with delays is a worldwide issue. There were seven different types of classifications. This questionnaire was issued to associated enterprises, consultants, and contractors for the purpose of rating the various elements. This data was used to generate the "Frequency index, Severity index, and Importance index" of various delay factors. The criteria were graded on their potential of creating a construction project delay, and the results were tabulated. The top five reasons of delays in any building project, according to the conclusions of this study, are: Material failure (Rank 1), Labour shortages (Rank 2), Delays in subcontractor work (Rank 3), Equipment failure (Rank 4) and Delays in consultation work (Rank 5).

Delay analysis for construction projects

The completion of any project in its period of time, which listed in the contract is one of the most difficult matter, that can not be achieved unless several activities must be done during the project life cycle. The main factors that affected the delay in project completion are investigated in this study, taking into account the circumstances of each factor relative to the other. The direct investigation, interviews with the team of project ( design, in situ office, consultant ) and the questionnaire methodologies was used to collect data about the project stages and problems. The study illustrate the main factors that causes delay in project completion, the extreme item was finance related, building materials related and project management related factors. The rate of them to total delay were 22 %, 18.4 % and 14.7 % respectively, and total delay caused by them was 55.1 % of total project delay. In finance the critical value was of delay in payment, weather; in the building materials the critical one was of the delay in supplying materials, while for the project management item the risk was in the fail in the in situ management.

Delay Analysis Methods for Construction Projects: Mathematical Modelling

Delay is quite common in construction project. A variety of factors contribute to the delay of project completion in the complex interdependencies of a number of tasks. Hence determining the contractual responsibility of delay is the most likely source of dispute in construction projects. Methods used for forensic investigation of delay are called as 'delay analysis methods'. Although authoritative societies such as SCL (Society of Construction Law) and AACEI (Association for the Advancement of Cost Engineering International) have published guidance for implementing delay analysis methods, those are explained by a natural language, i.e. English, not by a formal language. On the other hand, process control of construction projects heavily relies on CPM programming based on the network modelling technique of which concept is described in a formal manner. The ambiguity of methods due to the lack of guidance on delay analysis methods described in a formal language may allow delay analysts to implement in different ways. Utilizing the mathematics as a formal language to explain delay analysis methods should contribute to reduce the degree of ambiguity of delay analysis methods and hence the possibility of dispute occurrence. This paper aims to formalising delay analysis methods commonly applied in practice employing the mathematical language.

A Model for Evaluation of Delays in Construction Projects

2016

This study aims to identify the main causes of delay in construction projects. The study depends on a questionnaire survey list for determining the probability and the severity for the main causes of delay in construction projects. The questionnaire consists of total factors of ten groups. These ten groups have been consisted of total 63 delay factor. In this study, the authors found that most five important factor which effect on delay of the construction project are "Delay in progress payments by owner", "Poor site management and supervision by contractor", "Lack in qualified labours", "Difficulties in financing project by contractor", and "Ineffective planning and scheduling of project by contractor". A CPD Evaluation Model to evaluate the importance of each cause according to its importance index (IMP.I) and then ranking all causes was designed. The model was designed by using Virtual Basic.net.

IJERT-Study on Time Delay Analysis for Construction Project Delay Analysis

International Journal of Engineering Research and Technology (IJERT), 2015

https://www.ijert.org/study-on-time-delay-analysis-for-construction-project-delay-analysis https://www.ijert.org/research/study-on-time-delay-analysis-for-construction-project-delay-analysis-IJERTV4IS031166.pdf Time delay is one of the biggest problems facing in many construction buildings in India. Completing projects on time is the key factor of the project, but the construction process is subject to many variables and unpredictable factors, which result from many sources such as availability of resources, external factors, performance of parties and type of building. If there is a delay in project it leads to loss of productivity, increased cost, contract termination and disputes between contractor and owner. The aim of this project is to examine the causes and effects of delay on building construction project during construction phase and to provide control measures for time overrun in the project. A study carried out on construction schedule delays and various delay analysis techniques and methods in order to evaluate the causes of delay and their impacts in the construction project. Then a questionnaire survey is done to find the major causes of delay faced by Client, Contractor, Consultant and Project manager. Population sample of 35 was used in which 30 was deployed. From the survey and study identified 67 causes of delay under 9 major groups such as Project team, Owner, Contractor, Consultant, Architect, material, labour, equipment and external factors. Then a ranking method is done based on relative importance index method to find major cause of delay. It is found that the most common factors of delay which is repeated in most of the project are lack of funds to finance the project to completion, labour shortage, material shortage, lack of effective communication, lack of supervision and changes in drawings. The outcome of the project is to provide recommendation to control delay in the project during construction phase. Keywords-Delay analysis technique, causes of delay, tools to evaluate delay in construction, delay control measure

An Overarching Review on Delay Analyses in Construction Projects

Buildings, 2021

Numerous studies have been conducted by researchers on the delay analysis topic, which is one of the primary areas of scientific study due to the effects of delays on time and cost in construction projects. Following fruitful contributions made by the researchers, it is believed to be extremely important to summarize the existing studies in terms of being a road map for future studies and practitioners. In this context, not only does this study aim to detect the most significant authors, sources, organizations and countries contributing to the improvement of delay domain in the construction industry concerning delay analyses worldwide but also to provide the researchers with extensive insights concerning the prominent research themes, trends and gaps in the literature. Hence, 168 documents related to delay analyses from 1982 to 11 February 2021 were detected through the Scopus Database and the Web of Science Database, and scientometric analyses were conducted via VOSviewer software....

Evaluation of Delays Generated in Construction Projects

IAR Consortium, 2022

The research aims to know the delays in the construction projects, where this phenomenon was touched to the parties to the project from the owner, contractor and consultant, from the delay in benefiting from the project to an increase in the cost of works. Due to the disputes that occur this delay, and sometimes the poor quality of the work due to the acceleration of work in order to reduce the delay after the end of the project time as a result of the prosecution of the owner and the consultant. This study explored the important factors affecting construction project delay in the context of the construction sector in Iraq. It will be important to enhance training in detailed project planning and scheduling, and during the construction phase to carefully control budget and material orders to ensure business continuity. Within the planning, it will also be interesting to develop and implement integration models between the professionals involved, objectively defining roles and implementing them in the most approximate manner; In addition, it will be useful to implement project modeling techniques that allow the design and construction work of the relevant professionals to be combined and to get an idea of ​​the final result, identifying potential risks. Currency fluctuations, since they cannot be controlled, should be considered as a relevant point within the contingency margin, which again corresponds to good initial planning. Finally, it would be useful to focus efforts on fighting corruption and fraudulent practices in construction projects, which hinder the progress of developing countries

Impact of Delayness on Construction Projects

Delay is unique one in every of the biggest region construction companies are facing this time. This research paper deals with causes of delayness & evaluation of causes by RII & IMPI technique which are extremely effect on construction projects of buildings in India. Thus, Compressive study on the causes of step-down of delay factors of construction comes is extremely necessary. This study contained evaluation, ranking of factors of delayness and also comparison among three groups (i.e, Owner, Contractor & consultant). Total 38 causes are identified under 8 major groups. Total 35 stakeholders included in this research i.e, 9 owners, 12 contractors and 14 consultants which are ready to participate in this field survey This disseration advise the simplest way to seek out out ranking of causes of delay issue by 2 completely different methodology: Relative importance index and Importance index depend on Importance of cause, severity(how much cause impacts on project) and frequency(occu...

Dynamics of Pertinent Project Delay Variables in the Thai Construction Sector: Mathematical Analysis

Engineering Management in Production and Services

Project completion behind schedule is a struggle for the construction sector, affecting time, cost, and quality. This investigation has been necessitated by the lingering nature of project delay risks despite many extant analyses. This study collated expert opinions from the Thai construction sector on salient construction delay variables and their influence on each other for DEMATEL-SD analysis. The collated data were analysed and found consistent with a Cronbach’s alpha of 0.939. Then, the DEMATEL technique was used to establish the influence weight of factors for the System dynamics (SD) analysis. It was discovered that minimising the design error at the preconstruction stage significantly reduces the magnitude of delay. Increasing values of design error and change order increase the rework profile. Besides, the project delivery within the scheduled 232 weeks can be ensured by minimising the threat of design error, design change, change order, rework, productivity problem, and by...