Precast I-Girder Cracking Phase II: Causes and Design Details
Matching Research Agency
|Missouri Department of Transportation (MoDOT)|
|John Myers, Assistant Professor|
University of Missouri-Rolla
218 Engineering Research Lab.
Rolla, MO 65409
|One (1) M.S. student|
|To perform a statistical analysis on bridge information gathered form Missouri bridges. Monitor typical bridges, one cracked and one uncracked. Provide experimental validation for the cracking causes through finite element analysis. Propose experimental modifications to the current bridge guidelines to eliminate the problem of cracked prestressed I-girders. Determine the severity of the cracking and a method of repair, if necessary.|
|Prestressed concrete I-girder bridges constitute approximately 11% of all bridges on Missouri's state highway system. Recently, the Missouri Department of Transportation (MoDOT) has become concerned with the number of these bridges that are experiencing cracking. MoDOT has detected 110 prestressed concrete girder bridges with visible cracks near the girder ends. This project is a collaborative effort of UMR and UMC researchers in close collaboration with MoDOT R&D, Bridge and Bridge Maintenance Divisions, and a MoDOT District.|
- A statistical analysis of both cracked and uncracked bridges.
- Monitoring of one cracked and one uncracked bridge.
- Development of a FEM model to investigate the serviceability and stress induced performance of a cracked bridge.
- Determination of a set of proposed modifications to the MoDOT design guidelines.
|Enhanced QC/QA measures for precast/prestressed HPC members and a better understanding of the influence of SA/V on the QC of HPC.|
|Project Start Date:||10/01/1998|
|Project End Date:||12/31/2000|
Relationship to other Research/Projects
Technology Transfer Activities
|To assist MoDOT in the technology transfer of the revised design guidelines and possible repair techniques as the information becomes available. This may include presentations at state offices or dissemination of the report nationally.|
Transportation Research Board Keywords
|Concrete cracking, finite element analysis, prestressed concrete, thermal expansion, thermal stresses.|