Abstracts – Browse Results
Click on the titles below to expand the information about each abstract.
Viewing 6 results ...
Foroughi Sabzevar, M (2022) An AR-QR code approach to improve access of crews to design and construction information on construction sites, Unpublished PhD Thesis, , Drexel University.
Maor, I (2002) Conceptual design and selection of HVAC&r systems by combining knowledge based expert system with a building energy simulation program, Unpublished PhD Thesis, , Drexel University.
Marcellus-Zamora, K A (2015) An evaluation of material stocks and flows found during construction and demolition activities in the Philadelphia region of the United States, Unpublished PhD Thesis, , Drexel University.
Muir, R W, Jr. (2015) Application of lean construction principles to highway projects: Analysis of barriers to timely delivery of service, Unpublished PhD Thesis, , Drexel University.
- Type: Thesis
- Keywords: duration; effectiveness; motivation; trust; highway; traffic; utilities; waterways; constructability; key performance indicators; project cost; project delivery; owner; United States; project performance
- ISBN/ISSN:
- URL: https://www.proquest.com/docview/1671743216
- Abstract:
Highway project delivery of new and reconstructed facilities in the United States is viewed to consume too much time, thereby denying the traveling public of urgently needed infrastructure. The purpose of this thesis is to gain a better understanding of current highway project delivery and suggest interventions intended to enhance time performance. The major research focus is the Highway Project Performance (HPP) Study. The HPP study examined empirical data collected from 65 projects completed by 10 public highway agencies in the Northeast and Mid-Atlantic regions of the United States. Research included determining frequency and magnitude of duration escalation and identifying the input variables of process, practices, conditions, and constraints under which typical highway projects are delivered. Non-parametric procedures were used to test for differences among participating highway agencies. The Kruskal-Wallis and Mann-Whitney tests were employed to evaluate differences in mean TPI values for late and on time project subsets. Chi-square tests were conducted to analyze the difference in observations between the combined multi-dimensioned categories. Odds Ratio (OR) and relative risk or the risk ratio (RR) values were computed for the various categories including process and practices. Logistic regression was applied to the constraints as an additional test procedure. Semantic response differentials for each of the key performance indicators were also evaluated. The HPP Study findings showed that approximately 66% of highway projects finish beyond the original contract duration with a mean Time Performance Index (TPI) of 0. 859. Projects exposed to phased maintenance of traffic (MOT), utilities, streams or waterways, and railroads exhibit the greatest relative risk for duration escalation. Primary arterials, projects that combine bridge and roadwork, and those located in urban environments also exhibit greater relative risk of duration escalation. The relative risk of duration escalation increases exponentially with increase of project cost. Late and On Time project subsets exhibit differences in mean semantic differentials (MSD values) in constructability, the degree to which contract documents address constraints, quality and effectiveness of the contractor's schedule, and trust between the contractor and owner. These findings provide focus and motivation for owners to reduce the risk of duration escalation.
Pan, Q (2007) System identification of constructed civil engineering structures and uncertainty, Unpublished PhD Thesis, , Drexel University.
Plotnick, F L (2008) Rdm: Relationship diagramming method, Unpublished PhD Thesis, , Drexel University.