Abstract
The present work is aimed at studying the structural health status of Hunan Road Bridge, which is currently the widest concrete self-anchored suspension bridge in China. The monitoring data included the structural deformations, internal forces, and vibration characteristics from April 2015 to April 2016 were analyzed to evaluate the structural changes and safety. The influences brought by the ambient temperature changes and the dual effects composed of concrete shrinkage & creep (S&C) and seasonal temperature changes were analyzed based on the measured data. The long-time effects of concrete S&C were predicted using the CEB-FIP 90 model and the age-adjusted effective modulus method based on the ANSYS beam finite element model. The measured data showed that the transverse displacements of towers were more significant than the longitudinal ones. The spatial effect of the extra-wide girder is significant, which performs as the longitudinal stresses change unevenly along the transverse direction. The seasonal ambient warming caused overall increases in girder compressive stresses, and the cooling resulted in decreases along with significant temperature gradient effects. The prediction results show that the cable anchoring positions at girder ends and tower tops will move towards the mid-span affected by concrete S&C. In terms of the middle region of mid-span girder, significant increases in longitudinal stresses of top plate and decreases in the ones of bottom plate will be caused by the significant deflection. Comprehensively, the increases in the girder compressive stresses of side-span bottom plate and mid-span top plate are worthy of attention when confronted with extreme high temperature during the bridge service life cycle.
Highlights
It has become a trend to put equal emphasis on bridge’s attractiveness and practicability.The concrete self-anchored suspension bridge is becoming competitive among the numerous bridge types, because of its economy, elegant appearance, and reasonable force transmission form [1,2,3].Since most of the self-anchored suspension bridges are built in the thoroughfare of city transportation, the growth of traffic volume prompts the girder width to increase to 50 m or even more to meet the increasing lane requirements
The measured ambient temperatures of the foregoing moments were the same, which were 28 ◦ C, and the changes of structural alignments were mainly caused by the concrete shrinkage & creep (S&C) effects
The cable anchoring positions at girder ends moved towards the mid-span affected by concrete S&C
Summary
It has become a trend to put equal emphasis on bridge’s attractiveness and practicability.The concrete self-anchored suspension bridge is becoming competitive among the numerous bridge types, because of its economy, elegant appearance, and reasonable force transmission form [1,2,3].Since most of the self-anchored suspension bridges are built in the thoroughfare of city transportation, the growth of traffic volume prompts the girder width to increase to 50 m or even more to meet the increasing lane requirements. It has become a trend to put equal emphasis on bridge’s attractiveness and practicability. The concrete self-anchored suspension bridge is becoming competitive among the numerous bridge types, because of its economy, elegant appearance, and reasonable force transmission form [1,2,3]. Since most of the self-anchored suspension bridges are built in the thoroughfare of city transportation, the growth of traffic volume prompts the girder width to increase to 50 m or even more to meet the increasing lane requirements. The reliability of bridge is related to the lives of thousands of people and significant social impacts. The inevitable structural damages that are caused by the human factors, vehicle loads, and time-dependent effects will affect the bearing capacity and the durability of.
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