Evaluation of an Excessive Deflection Long-span Concrete Beam Bridge
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Bibliographic Details
| Author(s): |
Yanwei Niu
Xue-fei Shi Xin Ruan |
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| Medium: | conference paper | ||||
| Language(s): | English | ||||
| Conference: | 17th IABSE Congress: Creating and Renewing Urban Structures – Tall Buildings, Bridges and Infrastructure, Chicago, USA, 17-19 September 2008 | ||||
| Published in: | IABSE Congress Chicago 2008 | ||||
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| Page(s): | 102-103 | ||||
| Total no. of pages: | 7 | ||||
| Year: | 2008 | ||||
| DOI: | 10.2749/222137908796291949 | ||||
| Abstract: |
As long-span prestressed concrete (PC) beam bridges are constructed widely recently, two fatal problems: the excessive sustained deflection and cracks appear gradually. In order to assessing these effects, a cast in situ concrete bridge with three spans (65m+100m+65m), constructed by free cantilevering method ten years ago is evaluated. Firstly, the actual deflection of the bridge in service is demonstrated, and the cracks are classified. Then the characteristics of bridge deflection and cracks propagation are represented. In order to evaluate the material property and the working performance of the bridge, both static and deflection influence line test are proceeded. Based on this, rigidity identification is studied. Also, the random vehicle load model is simulated through Monte Carlo method. Consequently the bearing capacity and serviceability of the old bridge is evaluated. Finally, some suggestion of long-term deflection prediction and structure design is given. |
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| Keywords: |
crack load test bearing capacity evaluation long-span prestressed existing concrete bridge long-term deflection
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