Material Redundancy for Enhancing the Resistance to Collapse of the Florida International University (FIU) Bridge

A prestressed concrete bridge near the Florida International University (FIU) in Miami, USA, collapsed during construction in 2018. The incident spurred bridge engineers to rethink the design and construction of bridges. Recently, particular emphases have been placed on enhancing structural redundancy in bridges. In a bridge system, the use of redundant structural members may prevent bridge collapse if some members fail. This paper presents the concept of material redundancy – a new pathway to supplement the structural redundancy concept for improving the safety and resiliency of bridges. This study interprets the collapse mechanism of the bridge near FIU using a finite element model, which analyzes the evolution of internal loading and damage during bridge construction. The material redundancy concept is demonstrated by testing the effects of two families of high-performance fiber-reinforced cementitious composites on the damage of the bridge. Specially, this study investigates ultra-high-performance concrete (UHPC) and engineered cementitious composite (ECC), which feature high tensile properties, such as high crack resistance, tensile strength, and ductility. A parametric study is performed to evaluate the effects of the tensile strength and strain capacity of UHPC and ECC on the initiation and development of damage in the bridge. The results show that the use of ECC or UHPC can significantly decrease damage, and, thus, is promising to avoid the collapse of the bridge, because after concrete matrix cracks the dispersed fibers in ECC and UHPC can take over the load and provide redundancy at the material aspect.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 15p

Subject/Index Terms

Filing Info

  • Accession Number: 01764404
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-03231
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:04AM