International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 03 | Mar 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 4218 FUZZY LOGIC APPROACH IN CONSTRUCTION DELAY ANALYSIS Mathew B K 1 , Reshma Kassim 2 1 PG Student, Structural Engineering and Construction Management, Department Of Civil Engineering, Saintgits College of Engineering, Kottayam, Kerala, India 2 Assistant Professor, Department of Civil Engineering, Saintgits College of Engineering, Kottayam, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract – Delays are the biggest problem faced by the construction industry in India. Completing projects in time is the vital part of any construction project, but the construction process is subjected to many variables and unpredictable factors which make the time overrun. These factors result from many sources such as availability of resources, external factors, performance of parties, work specifications etc. When there is a delay in project not only it creates negative impact throughout the project but it also leads to loss of productivity, increased cost and contract termination. Delays in construction projects are inevitable and it may end in disputes among different construction parties. Delays in construction project needs to be identified and eliminated. This paper describes the application of fuzzy logic toolbox of Matlab Software for identifying the scheduled delays in construction projects. A case study of housing project at Kochi, Kerala is also included. Fuzzy logic provides a convenient deduction of result with vague input. The scheduled delay was obtained to be 32.9 percent from the actual schedule. Keywords: Delay Analysis; Fuzzy Logic; MATLAB; Construction project; Work specifications. 1. INTRODUCTION Planning and control of resources within the framework of a project is the main target of construction management. Various project management procedures guide on how the available resources can be best used during a construction work. Delay in schedule is widespread in most of the projects from around the world. Some of them may happen in the preconstruction phase, and some other in the construction phase. These delays create huge negative impacts on overall project performance. Schedule delay analysis is a method that is adopted in order to identify possible delay causing factors and measure the net impacts of these delays in a project. In schedule analysis, certain specific tools such as bar chart schedules and critical path method (CPM) schedules are used. Great amount of research works have been done in this field and presented common schedule analysis techniques. Some of them also have proposed new methodologies to the construction industry specifically. However, no single method is applicable in all kind of projects since each of these delay analysis technique has its own advantages and disadvantages. Main objective of this study is to propose a decision support tool for quantifying the probability of scheduled delay in construction projects. 2. LITERATURE REVIEW Onur B. Tokdemir et al (2019) proposed a delay risk assessment method for project scheduled by Line of Balance (LOB). In this method the schedule is prepared considering the target rate of delivery. The risk scenarios are defined considering the sources of uncertainty and vulnerability of activities. Then probability distributions are determined for the required number of labor-hours for each activity. For quantifying the delay risk of the project, Monte Carlo simulation method is used. Issaka Ndekugri et al (2016) did an empirical study into the current practices of delay analysis methodologies used in the United Kingdom. The work was part of a wider project that aimed at developing a framework for improving delay claims analysis. The work was based on a questionnaire survey of key informants in the construction field. The research found out that delay claims require inputs from various personnel involved in a work such as, commercial managers, schedulers, site managers, external claim consultants and estimators. However, commercial managers have greatest involvement in it. The study also found that claims analyzed using the methods; as-built versus as-planned and the impacted as- planned, are both successful. Nuhu Braimah (2015) studied the various common construction delay analysis techniques (DATs) based on a case study, i.e.; a review of the key relevant issues often not addressed by the various delay analysis techniques, and the necessary improvements needed in them. From the study it was confirmed that different analysis techniques yield different results for the same delay claims scenario, and this was mainly due to their unique application procedures. 3. FUZZY ASSESSMENT MODEL TO ESTIMATE THE PROBABILITY OF SCHEDULE DELAY 3.1 INTERVIEW WITH EXPERTS AND CREATION OF FUZZY RULES An interview with experts in construction field was conducted to obtain the fuzzy weight or rule weight for the rules in fuzzy logic toolbox. The interview was conducted with various personals such as Engineers, Quality controller, Planners, Supervisors, Builders etc. They were asked to give values to different delay causing factors ranging from 0 to 100, 0 being least causable and 100 highly causable. These results obtained were converted into percentage values