| 引用本文: | 任远,刘小玲,黄侨.斜拉桥恒载索力长期变化趋势分析与评估[J].哈尔滨工业大学学报,2015,47(6):103.DOI:10.11918/j.issn.0367-6234.2015.06.019 |
| REN Yuan,LIU Xiaoling,HUANG Qiao.The long-term trend analysis and assessment of the cable forces due to dead load in cable-stayed bridges[J].Journal of Harbin Institute of Technology,2015,47(6):103.DOI:10.11918/j.issn.0367-6234.2015.06.019 |
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| 摘要: |
| 为获取恒载索力,以在役斜拉桥封闭交通时的索力监测数据为研究对象,通过温度与索力的相关性分析,得到索力与温度呈线性关系的结论,并通过有限元模型计算结果进行验证;通过有限元模型对不同斜拉索索力的温度敏感性进行分析,得出温度对塔两侧较短索、边跨辅助墩附近较长索以及中跨长索索力影响较大的结论;利用斜率关联度和变权综合原理,根据成桥后9年内的数次封桥监测数据,对索力状态进行评估．结果表明,提出的索力评估模型能有效反映索力的均匀变化和非均匀变化趋势． |
| 关键词: 斜拉桥 索力 健康监测 温度效应 评估 |
| DOI：10.11918/j.issn.0367-6234.2015.06.019 |
| 分类号:U446.2 |
| 基金项目:国家自然科学基金(51208096);江苏省交通运输科技项目重大专项(2014Y02). |
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| The long-term trend analysis and assessment of the cable forces due to dead load in cable-stayed bridges |
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REN Yuan, LIU Xiaoling, HUANG Qiao
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（School of Transportation,Southeast University, 210096 Nanjing, China）
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| Abstract: |
| To obtain the cable force under dead load, the data was recorded during the closure of bridge by the health monitoring system of an existing bridge. Firstly, the linear relationship was obtained between the cable force and temperature through correlation analysis, and the results were verified by simulation results of finite element model. Secondly, the temperature sensitivity of the different cable force was analyzed using the finite element model. The stay cables deeply affected by the temperature include the short cables on both sides of the tower, longer cables near the assist pier of side span and long cables of the mid-span. Finally, nine years' monitoring data were selected and assessed based on correlation of slope coefficient and variable weight synthesis principle. The results show that the cable force assessment model effectively reflects the uniform change and non-uniform change of cable forces. |
| Key words: cable-stayed bridge cable force health monitoring temperature effect assessment |
