大跨度悬索桥经过长期服役后,部分吊杆索力与成桥索力易存在偏差,然而局部吊杆索力变化对整个主梁弯矩的影响不明确。以武汉阳逻大桥为研究对象,对大跨度悬索桥开展了数值分析,通过数值计算结果与实桥测试数据的对比验证了有限元模型的有效性。基于验证后的数值模型开展了参数化分析,研究了局部单根和三根吊杆索力10%、15%和20%的负偏差（小于成桥索力）对钢箱梁各梁段最大弯矩值的影响。结果表明： 单根或三根吊杆索力负偏差与钢箱梁弯矩变化量线性相关;当单根吊杆索力较成桥状态存在20%的负偏差时,钢箱梁弯矩增大40%到97%;当三根吊杆索力较成桥状态同时存在20%的负偏差时,钢箱梁弯矩增大195%到445%。
Abstract
After long-term service on a long-span suspension bridge, the cable force of some hangers can easily deviate from that of the completed bridge. However, the effect of the change in local hanger cable force on the bending moment of the whole main girder is unknown. In this paper,the Wuhan Yangluo Bridge is taken as the research object, and numerical analyses of a long-span suspension bridge are carried out. The validity of the finite element model is verified by comparing it with actual bridge test data. Based on the verified numerical model,a parametric analysis was carried out to study the effect of 10%, 15%, and 20% negative deviations of local single and three suspender cable forces （less than the cable force of the bridge） on the maximum bending moment of each beam section of the steel box girder. The results show that the negative deviation of single or three suspender cable forces is linearly related to the bending moment variation of a steel box girder. When the single suspender cable force has a 20% negative deviation from the bridge state, the bending moment of the steel box girder increases by 40% to 97%. When the cable force of the three suspenders has a negative deviation of 20% compared with the bridge state, the bending moment of the steel box girder increases by 195% to 445%.
关键词
大跨度悬索桥 /
吊杆索力偏差 /
钢箱梁弯矩 /
数值仿真
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Key words
long-span suspension bridge /
deviation of suspender cable force /
steel box girder bending moment /
numerical simulation
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