A Case Study Analysis of the Kentucky Transportation Cabinet’s Design/Build Pilot Projects

The current economic climate has forced transportation agencies to evaluate opportunities to save money. One possible opportunity lies in Design/Build (DB) delivery. In 2006, with the approval of the Kentucky General Assembly, The Kentucky Transportation Cabinet selected ten projects to be developed through the Design/Build method. DB delivery offers many attainable advantages, the most notable being expedited delivery. The research described herein presents a case study of these DB pilot projects in order to capture lessons learned on the use of the DB delivery method on future projects. In order to determine which projects are suitable for DB delivery, a scorecard was developed based upon factors observed over the course of the DB pilot projects. Another important aspect of the DB pilot projects was their cost, it was believed their costs were much higher than a comparable design/bid/build (DBB) projects. However, after a thorough cost analysis, it was determined that the DB projects cost the Cabinet only an estimated three percent more than comparable DBB projects. The DB pilot projects have had mixed results. Several recommendations are provided that will assist agencies with DB project selection and successful management of DB projects

Tools for Applying Constructability Concepts to Project Development (Design)

The purpose of this report is to document the activities of Phases I and II of the research effort and present the findings of the work accomplished. Phase I developed the Constructability Review Database for the Kentucky Transportation Cabinet and Phase II conducted a benefit analysis of the constructability review process. The database provides the basis for entry and collection of constructability reviews and allows for the identification of trends leading to potential improvements of the process. The database can be used to summarize activities, generate reports for a project, and be capable of quantifying the benefits from the process. The analysis documents the benefits of the reviews and recommends continuation and expansion to all projects

Modeling of work envelope requirements in the piping and steel trades and the influence of global anthropomorphic characteristics

Limited and unavailable workspace for crews on the jobsite results in losses of productivity. With the increased usage of Building Information Modeling (BIM) in the construction industry, four dimensional animation that brings together the three dimensional model of a building and its construction schedule to visualize construction process is emerging. To support space planning in the preconstruction management, this research provides a framework to integrate the knowledge of work envelope requirements among piping and steel trades. Typical work envelope requirements were defined through in-depth interviews with superintendents on U.S. industrial projects. Therefore, the rules and semantic information extracted from the interviews were summarized in seven decision trees, describing the geometric parameters relative to the body parts (e.g. chest and eye height). To compare the level of work envelope overlaps among global populations, anthropomorphic data was used to assess the absolute dimensions of the work envelopes. The results show that some work envelope requirements have a limited tolerance and are more sensitive to different body dimensions across global populations. It was found that in such situations the population anthropomorphic characteristics significantly impact the work envelope requirements. Therefore, this paper presents a decision supporting tool of work envelope requirements in compliment to space planning, which can improve the productivity, accuracy and efficiency of workspace management in the piping and steel trades

Updating the Kentucky Contract Time Determination System

The Federal Highway Administration requires State Transportation Agencies to have a formal method to estimate contract time for highway construction projects. To meet this requirement many states use an integrated scheduling system to estimate project durations based on assumed productivity rates and generic job logic. The current work investigated the accuracy of two of these systems found that both systems accuracy in predicting the duration of Kentucky Transportation Cabinet projects was greater than +200%. In response to this poor accuracy, a parametric project duration estimating tool was developed based on a multivariate regression analysis of bid item quantities and engineering and construction estimate. Five regression models were develop to estimate contract time for large projects (great than $1,000,000) based on key bid item quantities; limited access (+22$1,000,000) as it appears that the duration of small projects is determined by factors outside of bid item quantities

Impact of technology use on workforce performance and information access in the construction industry

For decades, labor shortage has been a consistent struggle in the construction industry. At the same time, technological innovations have played a central role in the growth and development of an increasingly diverse construction industry. Existing research indicates that technological adoption is crucial for enhancing project productivity. Despite the importance and potential benefits of technology use, no research has yet studied how technology use on-site impact the worker’s performance and the difficulty of the process to access needed information. The objective of this paper is to analyze and understand the impact of on-site technology use on 1) the self-evaluated performance record (including safety, attendance, quality, productivity, and initiative), and 2) the difficulty of the process to access information, of construction workers and frontline supervisors in the construction industry. To achieve the research objective, 2,780 construction craft workers and frontline supervisors were surveyed using an online questionnaire. The survey participants were asked to self-evaluate 1) their work personal performance record (including safety, attendance, quality, productivity, and initiative), and 2) the difficulty of the process to receive or get access to information. The participants were additionally asked to specify whether different listed information technologies, material technologies, and equipment technologies are used on site. The collected data was then analyzed. Key findings indicate that the on-site use of several technologies had statistically significant impact in increased worker performance and information access. This study contributes to the body of knowledge by empirically quantifying the impact of on-site technology use on worker performance and information access in the construction industry

The Effects of Information Format and Spatial Cognition on Individual Wayfinding Performance

Buildings with spatially complex interiors poise unique challenges during operations and maintenance. A complex interior makes wayfinding difficult, which can inhibit daily occupants from finding their desired location. Additionally, it can hamper emergency responders and evacuations during extreme emergency events. An experiment was conducted to analyze the effects of different information formats and spatial cognition on individual wayfinding in unknown environments. Participants were asked to memorize either a set of two-dimensional (2D) drawings or a three-dimensional (3D) model before navigating through a series of checkpoints in an unfamiliar environment. Individual wayfinding is dependent on an individual&rsquo;s use of route knowledge or survey knowledge. Route knowledge was assessed from the start of the route to Checkpoint A (i.e., the first checkpoint). Meanwhile, survey knowledge was assessed from Checkpoint A to Checkpoint B. Spatial cognition of participants was measured by administering the card rotation and cube comparison tests. The research found that 3D models have a beneficial impact on the success of individual wayfinding. Furthermore, the success rate of the participants with a low spatial cognition improved significantly when using a 3D model rather than a set of 2D drawings. However, the success rates of participants with a high spatial cognition were not affected by the format of information. While the above results are significant, more experimentation is needed to confirm whether 3D information does effectively lower cognitive demand.</div

Investigating Project Bundling Practices for Transportation Construction Projects

Project Bundling is an innovative contract procurement strategy that is being widely used in bridge and highway projects to save project delivery time and costs. The guidebook developed by FHWA on project bundling also provides a wealth of information on project bundling. However, the guidebook is primarily focused on the project bundling practices that STAs adopted for bridge projects. Thus, a knowledge gap in project bundling for roadway projects (such as added travel lanes, resurfacing, intersection improvement, interchange work, shoulder rehabilitation and repair, etc.), might exist

Virology under the microscope—a call for rational discourse

Viruses have brought humanity many challenges: respiratory infection, cancer, neurological impairment and immunosuppression to name a few. Virology research over the last 60+ years has responded to reduce this disease burden with vaccines and antivirals. Despite this long history, the COVID-19 pandemic has brought unprecedented attention to the field of virology. Some of this attention is focused on concern about the safe conduct of research with human pathogens. A small but vocal group of individuals has seized upon these concerns – conflating legitimate questions about safely conducting virus-related research with uncertainties over the origins of SARS-CoV-2. The result has fueled public confusion and, in many instances, ill-informed condemnation of virology. With this article, we seek to promote a return to rational discourse. We explain the use of gain-of-function approaches in science, discuss the possible origins of SARS-CoV-2 and outline current regulatory structures that provide oversight for virological research in the United States. By offering our expertise, we – a broad group of working virologists – seek to aid policy makers in navigating these controversial issues. Balanced, evidence-based discourse is essential to addressing public concern while maintaining and expanding much-needed research in virology

The impact of equipment technology on productivity in the U.S. construction industry

textIn general, U.S. industry has witnessed dramatic changes in the way it accomplishes its core processes over the past 25 years. Well-understood technological and managerial advances have allowed the manufacturing sector, for example, to steadily increase its productivity, and with it, its profit margins. In construction, related changes are far less well understood. Previous related research indicates that labor and partial factor productivity may in fact be increasing in the U.S. construction industry. This research examines the effect of technology, specifically equipment technology, on productivity. Changes in labor and partial factor productivity are analyzed for 200 activities from 1976 to 1998. During that same time period, changes in equipment technology are measured through economic measures, a technology index, and five technology factors of change, which are changes in control, energy, functional range, information processing, and ergonomics. Through ANOVA and regression analyses, it is found that changes in equipment technology have played a substantial role in changes in labor and partial factor productivity. The research also shows that changes in control, energy, and functional range have each lead to an added increase in labor productivity from 15 to 25% between 1976 and 1998 with similar increases in partial factor productivity. A review of existing literature on productivity and technical change and an anecdotal summary of construction manager’s experiences in these areas are also included in the study.Civil, Architectural, and Environmental Engineerin