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| Time-dependent reliability analysis of reinforced concrete bridge under atmospheric environment |
| Received:April 15, 2021 Revised:June 14, 2021 |
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| DOI：10.7511/jslx20210415002 |
| KeyWord:atmospheric environment resistance degradation time-dependent reliability vehicle load simply supported beam bridge |
| Author | Institution |
| 陈水生 |
华东交通大学 土木建筑学院, 南昌 |
| 赵辉 |
华东交通大学 土木建筑学院, 南昌 |
| 李锦华 |
华东交通大学 土木建筑学院, 南昌 |
| 朱治蒸 |
华东交通大学 土木建筑学院, 南昌 |
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| Abstract: |
| In order to explore the influence of resistance degradation of reinforced concrete bridges on the reliability of bridges,this paper established a time-varying model of resistance degradation of ordinary reinforced concrete bridges by comprehensively considering the reduction of concrete strength,reinforcement strength and bond performance of concrete and reinforcement in general atmospheric environment,and analyzed the time-dependent reliability of bridges under vehicle loads.The results show that: (1) In general atmospheric environment,the resistance of bridge decreases with the increase of service time.The degradation of steel strength has the greatest impact on the resistance of bridges,followed by the reduction of bond between steel and concrete,while the degradation of concrete strength has relatively small impact on the resistance of bridge.(2) The reliability index of bridge decreases with the increase of service time.The larger the proportion of intensive traffic,the greater the probability of failure of bridge bearing capacity.The bridge reliability index under the action of non-stationary vehicle is less than that under the action of stationary vehicle,and the bridge needs to be repaired earlier than that under the action of stationary vehicle.(3) During the construction of multi beam simply supported bridge,the safety reserve of side beam should be improved,and the load limiting measures can be taken to intervene in the management and maintenance. |
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