Monitoring of the Launched Girder Bridge over the Iowa River on US 20, March 2004

The objective of the study presented in this report was to document the launch of the Iowa River Bridge and to monitor and evaluate the structural performance of the bridge superstructure and substructure during the launch. The Iowa Department of Transportation used an incremental launching method, which is relatively unique for steel I-girder bridges, to construct the Iowa River Bridge over an environmentally sensitive river valley in central Iowa. The bridge was designed as two separate roadways consisting of four steel plate girders each that are approximately 11 ft deep and span approximately 301 ft each over five spans. The concrete bridge deck was not placed until after both roadways had been launched. One of the most significant monitoring and evaluation observations related to the superstructure was that the bottom flange (and associated web region) was subjected to extremely large stresses during the crossing of launch rollers. Regarding the substructure performance, the column stresses did not exceed reasonable design limits during the daylong launches. The scope of the study did not allow adequate quantification of the measured applied launch forces at the piers. Future proposed esearch should provide an opportunity to address this. The overall experimental performance of the bridge during the launch was compared with the predicted design performance. In general, the substructure design, girder contact stress, and total launching force assumptions correlated well with the experimental results. The design assumptions for total axial force in crossframe members, on the other hand, differed from the experimental results by as much as 300%.

Annual Report, Fiscal Years 2004 - 2006

DAS was established on July 1, 2003, by consolidating the departments of General Services, Information Technology, Personnel, and the Accounting Bureau of the Department of Revenue and Finance. In introducing our new department, you outlined four goals of this consolidation: 1. Improve service to customers, 2. Save money, 3. Streamline, and 4. Enhance resource flexibility for state government managers. Launch of the new department signaled more than just the consolidation of state government infrastructure providers. It also marked the first large-scale rollout of entrepreneurial management, a business model characterized by a customer-focused approach to delivering services in a competitive marketplace. In entrepreneurial management organizations, business decisions are motivated by the desire to meet customer needs and by rewards or consequences for financial performance. We’re pleased to provide this Annual Report for your review and trust you will agree that entrepreneurial management in state government is a viable working concept and remains a valuable asset to Iowans.