Firat Dogu Akin

Istanbul Technical University · Department of Civil Engineering

The process of intentionally offering overstated unit bid prices for some line items, while understating the unit bid prices for others is known as unbalanced bidding. Owners can exercise their right to reject an unbalanced bid because it may burden them in extra costs. Since unbalanced bids are not welcome by owners, models developed to detect and...

The success of a construction project is often evaluated by time, cost, and quality performances, which are interdependent. Shortening the project duration does not only increase the direct cost but also affects the project’s quality cost positively or negatively. In addition, the contract clauses in terms of penalty cost and early finish bonus hav...

Time and cost are two of the most important performance indicators of construction projects. Project crashing is one of the effective methods for solving time-cost trade-off problems. However, in some instances, consuming all of the crash durations of the activities may lead to inflexible schedules. This paper proposes a project crashing model that...

An unbalanced bid is a bid that contains manipulated unit bid prices that do not reflect the reasonable unit bid prices. Owners should be able to stop an unbalanced bid because it may increase the cost of construction. Therefore, the majority of the current literature on unbalanced bidding focused on how to detect unbalanced bids in order to reject...

In today's construction world it is no longer enough to just deliver a project, it is also aimed that the project is delivered in the timeliest manner, with the highest quality and with the most feasible budget. In order to do so, people involved in project management have developed new ways such as lean and agile delivery methods. Lean management...

Project crashing, a.k.a. project compressing or time-cost trade-off, is an important aspect of managing construction projects. Project crashing can be defined as the time-cost optimization technique, which aims to compress the total project duration with the least incremental cost. In real life problems, the quality is affected when some activities...

Completing on time, within the estimated budget and at the desired quality are three main constraints of construction projects. However, construction projects become nowadays more complex than ever, so they are subjected to uncertainties and changes throughout the project life cycles. These uncertainties and changes may lead to severe delays in pro...

The management of resources has been claimed to be as important as scheduling methods. Inefficiency in managing resources may bring about severe delays and cost overruns caused by resource shortages in some cases and/or idle resources in others. Therefore, resources should be utilized efficiently to prevent project failures. Resource leveling is on...

Unbalanced bidding, also known as skewed bidding, is the process of increasing and/or decreasing the prices of various bid items without altering the total offered bid price. Bids can be unbalanced either mathematically (front-end loading) or materially (quantity error exploitation). Owners should be very careful when evaluating the tenders as awar...