Delay

nabil's picture

Time Overrun Causes in Public Construction Projects in Saudi Arabia: Contractors’ View

Journal Title, Volume, Page: 
Journal of Construction Engineering, Technology & Management, 3 (3), 67 – 75
Year of Publication: 
2013
Authors: 
Mahamid, I.
Dmaidi, N.
Current Affiliation: 
Department of Civil Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine
Preferred Abstract (Original): 

The time schedule in construction projects is one of the prime measures for project success. However, the construction industry worldwide is full of projects that were completed with significant time overrun. This problem is critical and has negative effects on construction parties in terms of growth in adversarial relationships, mistrust, litigation, arbitration and cash flow problems. This study aims at identifying the time overrun causes in public construction projects in Saudi Arabia from contractors’ viewpoint. To do so, 62 contractors from Northern Province of Saudi Arabia who are working on public construction completed a structured questionnaire survey. 35 time overrun causes were identified through literature review. The results indicated that the top affecting causes are: additional work, bid award for lowest price, changes in material types and specifications during construction, contract management, fluctuation of prices of materials, improper planning, inflationary pressure, lack of contractor experience, poor labor productivity, and rework.

Wael alhajyaseen's picture

Consideration of Vehicular and Pedestrian Flows in A Multi-Modal Traffic Signal Optimization Strategy for Isolated Intersections

Journal Title, Volume, Page: 
An-Najah University Journal for Research - Natural Sciences - Volume 28, Issue 1, 2014
Year of Publication: 
2014
Authors: 
Wael Alhajyaseen
Department of Civil Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine
Current Affiliation: 
Department of Civil Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine
Meng LI
Department of Civil Engineering, Tsinghua University, 100084, Beijing, China
Preferred Abstract (Original): 

Current signal control strategies tend to ignore the pedestrian delays that may be imposed by reducing traffic delays. Such an objective is reasonable for motorways and rural roads where vehicular traffic is dominant over pedestrian traffic. However, it is not the case in metropolitan cities with large volume of pedestrian demands. This paper developed a traffic signal optimization strategy that considers both vehicular and pedestrian flows. The objective of the proposed model is to minimize the weighted vehicular and pedestrian delays. The deterministic queuing model is used to calculate vehicular traffic delay and pedestrian delay on sidewalk. Pedestrian delay on crosswalk is calculated based on an empirical pedestrian speed model, which considers interactions of pedestrian platoons and their impacts on average walking speed. A Japanese Intersection is utilized as a numerical case study to evaluate the proposed model. MATLAB is used to solve the optimization problem and to output a set of measures of effectiveness (MOEs). The results show that the proposed model improved average person delay (APRD) by 10% without changing the existing cycle length. Moreover, the model can optimize the cycle length and further improve APRD by as much as 44%. In order to demonstrate the applicability of the proposed model for general cases, this paper also conducted sensitivity analysis. The results showed that the proposed model is most significant and necessary for two circumstances: (1) metropolitan areas with high pedestrian demands and (2) major urban arterials with high pedestrian demands crossing major streets.

nabil's picture

View Toward The Factors Affecting Timeoverrun In Public Construction Projects

Journal Title, Volume, Page: 
JOURNAL OF ADVANCED RESEARCH IN ENGINEERING AND TECHNOLOGY (JARET), Volume 1, Issue 1, July – December 2013, pp. 08-14
Year of Publication: 
2013
Authors: 
Ibrahim Mahamid
Assistant professor, Hail University, Civil Engineering Department, Hail, 2440, KSA
Nabil Dmaidi
Associate professor, An-Najah National University, Civil Engineering Department, Nablus, Palestine
Current Affiliation: 
Department of Civil Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine
Preferred Abstract (Original): 

  The study aims at identifying the factors affecting time overrun in public construction projects Saudi Arabia from consultants’ viewpoint. To do so, 70 consultants working in public construction completed a structured questionnaire survey and the factors were ranked according to their levels of severity, frequency, and importance. 34 factors were identified through interview with some local construction experts and deep literature review. The analysis of the identified 34 factors indicates that the top five important factors affecting time overrun in public construction projects are: improper planning, poor labor productivity, additional works, rework, and lack of contractor experience. The results also indicate that the  top five severe factors affecting time overrun in public construction projects in Saudi Arabia are: bid award for lowest price, poor labor productivity, improper planning, additional work, and lack of contractor experience. While the top five frequent factors are: rework, improper planning, changes in material types and specifications during construction, poor contract management, and poor resource management. 

nabil's picture

Causes of Delay in Road Construction Projects

Journal Title, Volume, Page: 
Journal of Management in Engineering, Volume 28, Issue 3 (July 2012)
Year of Publication: 
2012
Authors: 
Ibrahim Mahamid
Assistant Professor, Civil Engineering Dept., Hail Univ., Hail, Saudi Arabia
Amund Bruland
Professor, Civil and Transport Engineering Dept., Norwegian Univ. of Science and Technology, Trondheim, Norway
Nabil Dmaidi
Department of Civil Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine
Current Affiliation: 
Department of Civil Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine
Preferred Abstract (Original): 

The construction industry is one of the main sectors that provides important ingredients for the development of an economy. However, many projects experience extensive delays and thereby exceed initial time and cost estimates. Construction delay is considered to be one of the most recurring problems in the construction industry and it has an adverse effect on project success in terms of time, cost, quality, and safety. This study is conducted to investigate the time performance of road construction projects in the West Bank in Palestine to identify the causes of delay and their severity according to contractors and consultants through a questionnaire survey. The field survey included 34 contractors and 30 consultants. A total of 52 causes of delay were identified during the research. The survey concluded that the top five severe delay causes are political situation, segmentation of the West Bank and limited movement between areas, award project to lowest bid price, progress payment delay by owner, and shortage of equipment.

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