Khaled Hyari | The Hashemite University (original) (raw)

Papers by Khaled Hyari

Journal of Legal Affairs and Dispute Resolution in Engineering and Construction, 2021

AbstractUnit price contracts are awarded to contractors based on estimated quantities of work, wh... more AbstractUnit price contracts are awarded to contractors based on estimated quantities of work, while payments to contractors are based on the actual quantities performed. Deviations between such es...

Collaboration and Integration in Construction, Engineering, Management and Technology, 2020

Construction Innovation, 2020

Purpose The purpose of this paper is to analyze and evaluate bidding competitiveness and success ... more Purpose The purpose of this paper is to analyze and evaluate bidding competitiveness and success rate of contractors bidding for public construction projects (PCPs). Additionally, this research determines the effect of work sector, contractor’s classification category (experience), project size and number of bidders on contractors’ bidding competitiveness, and the influence of work sector and classification category on their success rate. Design/methodology/approach The data were collected through 2,296 bidding attempts for 289 tender projects that were announced by the Government Tenders Department in Jordan between 2013 and 2016. The research uses bid competitiveness percentage (BCP) to evaluate contractors’ bidding competitiveness. Pearson correlation is used to investigate the correlation among variables. Hypothesis testing using ANOVA was conducted to evaluate the effect of the abovementioned factors on contractors’ bidding competitiveness, and their success rate. Findings The ...

Journal of Computing in Civil Engineering, 2018

AbstractRecent research interest in nondominated sorting genetic optimization has increased remar... more AbstractRecent research interest in nondominated sorting genetic optimization has increased remarkably due to its effectiveness in handling multiple objectives without scalarization. Algorithms for...

International Journal of Innovation, Management and Technology, 2017

Procurement of public construction projects generally adopts first-price sealed auctions to promo... more Procurement of public construction projects generally adopts first-price sealed auctions to promote competition between bidders and reduce owner's cost. This paper presents an analysis for bidding behavior of contractors in public construction markets. The analysis utilizes real data representing the bid results of 1396 projects submitted for public construction projects in Jordan. Bidding data were classified depending on the type of project into: building construction, transportation, infrastructure, water, and electro-mechanical projects. The data includes also engineering design and/or engineering supervision projects. The analyzed behavior attributes are: 1) competition between bidders measured by number of bidders and the bid spread between the lowest two bidders; and 2) bidding variability measured by the coefficient of variation. The analysis revealed that number of bidders and bid spread depend on type of project advertised and market conditions. The variability of bidding results also is correlated with type of project. The performed analysis provide owners with an assessment of the efficiency of the competitive bidding process and can be used to identify weaknesses that need to be addressed in bidding regulations. Contractors can utilize the results to develop their bidding strategies to win profitable jobs.

International Journal of Structural Engineering, 2017

A two-stage finite element system identification (SI) technique is proposed in this paper to iden... more A two-stage finite element system identification (SI) technique is proposed in this paper to identify stiffness of elements and detect damages in three-dimensional framed structures. The technique combines in stage 1 the iterative least-square and in stage 2 the unscented Kalman filter (UKF) to identify the stiffness of elements using only limited measured response time histories from only four to six accelerometers instead of dozens of accelerometers of the whole structure and assuming the time history of dynamic load applied on structure is unknown. The method will identify the stiffness and detect the damages in the elements by tracking the changes in the recordable dynamic output responses between damaged and undamaged states. The optimum number and locations of accelerometers were studied in this paper. The algorithm is verified using numerical examples. The results showed clearly that the technique can identify damaged and undamaged three-dimensional steel framed structures and the minimum number of sensors required for such frames.

Environmental Processes, 2017

Following the unconditional definition of drought events, this study presents general mathematica... more Following the unconditional definition of drought events, this study presents general mathematical expressions that can be used to evaluate the occurrence probability and the return period of multiyear drought events of extreme magnitude evolved after truncating low order dependent hydrological or meteorological processes. The drought magnitude was fitted using the gamma distribution and the drought run length was defined unconditionally regardless where the run starts as long as it satisfies the continuity. Considering the joint analysis of the drought magnitude and the run length, the characteristics of the multiyear drought of extreme magnitude achieved theoretically was found to match well with empirical results obtained after analyzing the simulated and historical precipitation. After truncating the annual rainy season precipitation for Madaba region in Jordan, the 6-year extreme historical drought that occurred in 1958-1963 was a rare event recurring every 226 years. In the semi-arid region of Madaba, meteorological drought events of a short duration, 2-3 years, and a precipitation deficit of 149 mm or less are frequent events with 7-10 years return period, while events of 4 years or more, tested at deficit threshold of 149 mm, are less frequent events regardless of their magnitude.

Journal of Construction Engineering and Management, 2017

AbstractUnit-price contracts are awarded based on estimated quantities while payment to the contr... more AbstractUnit-price contracts are awarded based on estimated quantities while payment to the contractor is based on actual quantities of work. In many cases, estimated and actual quantities never pe...

International Journal of Structural Integrity, 2017

Purpose The purpose of this paper is to detect damages in steel structures with actual connection... more Purpose The purpose of this paper is to detect damages in steel structures with actual connections, i.e. semi-rigid connections. The method will detect the damages by tracking the changes in the stiffness of structural members using only a limited number of dynamic responses and without knowing the type or time history of the dynamic force applied on the structure. Design/methodology/approach The paper proposes a technique that combines the iterative least-square and unscented Kalman filter (UKF) methods to identify the stiffness of beams and columns in typical two-dimensional steel-framed structures with semi-rigid connections. The detection of damages is by using nonlinear time-domain structural health monitoring method. Findings The technique is verified by using numerical examples using noise-free and noise-included dynamic responses from two different types of dynamic forces: harmonic and blast loads. The results showed that the UKF method with iterative least-square is a power...

International Journal of Advanced Computer Science and Applications, 2016

Effective communication among project participants in construction sites is a real dilemma for co... more Effective communication among project participants in construction sites is a real dilemma for construction projects productivity. To improve the efficiency of participants in construction projects and have a speedy delivery of these projects, this paper presents the development of a mobile application system to support construction site communication. The developed system is designed to enhance communication between home office employees, field office staff, and mobile users at the construction sites. It has two components: a mobile application and a website. The mobile application component provides users with valuable features such as, receive sites' instructions, send requests for interpretations and retrieve information about projects. Whereas, the website component allows users, such as, home office employees to track projects' progress and find projects' location. The developed system is tested first on emulators and then on Android devices. After that the system was tested on a highway improvement project. Through their mobile phones, site users are able to interact with field office and home office personnel who use the web application to communicate with mobile users. It is expected that this work will contribute to facilitate communication in construction sites, which is much needed in this information intensive sector.

Journal of Professional Issues in Engineering Education and Practice, 2017

AbstractUnbalanced bidding continues to be a controversial issue in the literature as well as in ... more AbstractUnbalanced bidding continues to be a controversial issue in the literature as well as in actual competitive bidding practices. Although a considerable amount of the past research advocated unbalanced bidding and viewed it as a legitimate bidding strategy, public bidding regulations discourage this practice and may disqualify unbalanced bids as nonresponsive offers. In an attempt to ease the controversy and present for the first time a balanced perspective on unbalanced bidding, this paper examines the two conflicting perspectives and conducts a review of the literature reflecting the owners’ and the contractors’ perspectives and an analysis of the conflicting impacts of bid unbalancing on the owner and the contractor. The root causes of disagreement around this practice are discussed and criteria are suggested that draw a line between acceptable and unacceptable bid unbalancing. The proposed criteria seek equitable risk-sharing between owners and contractors and are expected to minimize the ambigu...

Journal of Management in Engineering, 2017

AbstractSkewed bidding is advocated as a contractor bidding strategy to obtain higher profit at t... more AbstractSkewed bidding is advocated as a contractor bidding strategy to obtain higher profit at the expense of the owner or gain competitive advantage over other bidders. Many scholars presented bi...

Journal of Construction Engineering and Management, 2016

Unbalanced pricing of bid line items is considered an undesirable practice by owners and may lead... more Unbalanced pricing of bid line items is considered an undesirable practice by owners and may lead to rejection of the bid on the basis of nonresponsiveness to the bidding regulations. This paper presents the development of a detection model to help owners detect objectionable unbalanced bidding. The proposed model quantifies the risk afforded by deviations of the actual quantities of work from the estimated quantities of the bid line items. The proposed model also considers the impact of multiple uncertainties in line item quantities on the owner's total project cost based on the unit prices submitted by all the bidders for the project. Historical deviations from the estimated quantities during previous construction projects are used as an indicator of future fluctuations in the estimated quantities. The proposed model allows uncertainty in the quantities of work to be incorporated into the bid evaluation stage to assess each bidder's likelihood of being the truly lowest bidder (i.e., yielding the lowest cost to the owner). An application example, based on actual bid results submitted to the California Department of Transportation, was used to illustrate the effectiveness of the model in detecting objectionable unbalanced bids. The model is expected to provide much needed support for owners in the bid evaluation stage and to reduce the controversy around unbalanced pricing because it targets material unbalancing rather than the whole practice of unbalanced pricing.

Journal of Transportation Engineering, 2016

AbstractRoadway lighting systems play a major role in maintaining nighttime traffic safety as the... more AbstractRoadway lighting systems play a major role in maintaining nighttime traffic safety as they reduce both the number and severity of nighttime traffic accidents. While the design of roadway lighting systems involves multiple objectives, past studies have focused on optimizing only one of the multiple objectives that should be considered. This paper presents a multiobjective optimization model for roadway lighting projects that simultaneously optimizes four design objectives. The incorporated objectives are (1) maximizing the average lighting level on the road surface; (2) maximizing the lighting uniformity along the roadway; (3) minimizing the glare to road users produced by the lighting system; and (4) minimizing the cost of operating the lighting system. The model is designed and developed as a multiobjective genetic algorithm to help decision-makers in their endeavor to provide efficient roadway lighting systems that strike a balance between the four conflicting objectives. The present model consi...

Construction Research Congress, 2003

The utilization of nighttime construction in highway projects has been increasing in recent years... more The utilization of nighttime construction in highway projects has been increasing in recent years in order to alleviate construction-related traffic congestions and delays. In order to ensure quality and safety in these nighttime construction projects, proper and adequate lighting conditions need to be provided on site. This paper presents the findings of a recent study that focused on (1) identifying lighting requirements for nighttime construction operations in highway projects; and (2) developing a practical design tool to address these requirements. Survey and site visits were conducted to identify the current practices and requirements of highway nighttime construction operations. The analysis of the survey results have led to a number of important findings, including: (1) participant Departments of Transportation (DOTs) reported that an average of 17% of their construction projects involved nighttime work in fiscal year 2001; (2) standards to regulate work zone lighting were found to be lacking in many states as 60% of responses received from state DOTs indicated that they do not have lighting standards or guidelines for nighttime construction operations; and (3) the main challenges in nighttime construction lighting were identified to be insufficient lighting, non-uniformity of provided lighting, and glare to road users. This paper also presents a design and optimization tool to address the needs of highway nighttime construction operations that were identified in the above survey. This tool can be utilized by contractors in design and implementation of lighting arrangements, and by resident engineers in the inspection of lighting conditions on site.

Journal of Legal Affairs and Dispute Resolution in Engineering and Construction

International Journal of Construction Education and Research, Mar 4, 2015

Enterprise resource planning (ERP) systems are increasingly becoming essential business technolog... more Enterprise resource planning (ERP) systems are increasingly becoming essential business technologies. Selection of the optimal ERP system among numerous alternatives is regarded as a major challenge for the decision-maker. This choice is complicated by multiple attributes that the decision-maker needs to consider when evaluating different ERP options. The purpose of this article is to propose a multi-attribute decision-making model for ERP system selection based on data envelopment analysis (DEA). The strengths of the proposed DEA model include the input-output framework, which allows decision-makers to incorporate multiple attributes when evaluating different ERP options. These attributes are not required to be congruent. They can be measured by such criteria as monetary sums, time, or subjective score. Additionally, DEA can accommodate a large number of options (i.e., ERP systems) and variables (i.e., attributes). The proposed approach was utilized by a construction contractor to select the optimal ERP option out of eleven alternatives. During the evaluation process, the decision-maker incorporated six attributes to make the decision. These considered attributes are total cost, implementation schedule, functionality, user friendliness, customization capability, and service and support quality. Sensitivity analysis proved that the proposed model is stable and robust.

Journal of Construction Engineering and Management, 2015

Printout. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2004. Vita. Includes biblio... more Printout. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2004. Vita. Includes bibliographical references (leaves 233-240)