Critical issues, condition assessment and monitoring of heavy movable structures: emphasis on movable bridges

Abstract

In this paper, a relatively less studied class of structures is presented based on the research conducted on Florida's movable bridges over the last several years. Movable bridges consist of complex structural, mechanical and electrical systems that provide versatility to these bridges, but at the same time, create intermittent operational and maintenance challenges. Movable bridges have been designed and constructed for some time; however, there are fewer studies in the literature on movable bridges as compared to other bridge types. In addition, none of these studies provide a comprehensive documentation of issues related to the condition of movable bridge populations in conjunction with possible monitoring applications specific to these bridges. This paper characterises and documents these issues related to movable bridges considering both the mechanical and structural components. Considerations for designing a monitoring system for movable bridges are also presented based on inspection reports and expert opinions. The design and implementation of a monitoring system for a representative bascule bridge are presented along with long-term monitoring data. Various movable bridge characteristics such as opening/closing torque, bridge balance and friction are shown since these are critical for maintenance applications on mechanical components. Finally, the impact of environmental effects (such as wind and temperature) on bridge mechanical characteristics is demonstrated by analysing monitoring data for more than 1000 opening/closing events.

Exploring multi-use platforms: A literature review of marine, multifunctional, modular, and mobile applications (M4s)

“…Examples of mobile solutions include self-propelled ships and barges, as well as floating offshore wind farms. Mobile structures are flexible, versatile, and less intrusive than permanent ones [ 14 , 15 ]. Mobile offshore platforms have been classified as active mobile assets (ships), passive mobile assets (floats), stationary assets (moorings), and shore-mounted assets [ 16 ].…”

Diagnostic Testing of a Vertical Lift Truss Bridge for Model Verification and Decision-Making Support

“…For instance, the maintenance of movable bridges like vertical lift bridges is of high importance given the frequency of lift operation to allow for marine traffic. However, with the hundreds of movable bridges in the US, which are typically located in coastal environments that are typically highly susceptible to extreme weather events, there are few long term monitoring programs for these bridges subjected to vertical operations in addition to traffic and environmental loads (Catbas et al, 2014).…”