悬臂施工的钢混混合连续梁桥台风响应实测与分析
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摘要
针对大跨度钢混凝土混合连续梁桥马尾大桥,将桥梁承受的台风荷载等效为均布静力荷载,利用有限元计算和实桥测试对大桥在施工过程中的台风荷载响应进行分析和验证,并对大桥在施工过程中遭遇台风影响的风险进行评估。应力计算结果表明,测试截面的应力随着台风等级的增大而增大,应力和台风等级的关系近似于线性关系;永久荷载和台风荷载共同作用下,大桥各应变测试截面的应力不会超过C55混凝土的极限拉应力。大桥测试截面的应变实测结果与有限元模型计算结果的比较表明,大桥在台风荷载作用下的应变实测结果与有限元计算结果基本一致;应变实测结果比有限元计算结果略小,说明在台风荷载作用下,结构受力性能合理。
Basing on a large span steel concrete mixed continuous girder bridge, the Mawei Bridge, the typhoon effect on the bridge was equivalent to the static uniform loading. The finite element calculation and the field test were applied to calculate the typhoon response during the construction process. The risk of the bridge facing the typhoon during the construction process was evaluated. The result of the stress calculation shows that the stress of the measuring sections increased with the increasing of the typhoon level, while the relationship between the stress and the typhoon level is approximately linear. Under the combined action of the permanent loading and the typhoon loading, the stress of the measuring sections does not exceed the ultimate tensile stress of C55 concrete. The comparing result of the measured result and the calculated result proved that the measured stress under the effect of the typhoon was basically consistent with the calculated results, so the reliability of the finite element calculation was proved. The measured result is slightly less than the calculated result, which indicates that the structural performance under typhoon loading is reasonable.
Basing on a large span steel concrete mixed continuous girder bridge, the Mawei Bridge, the typhoon effect on the bridge was equivalent to the static uniform loading. The finite element calculation and the field test were applied to calculate the typhoon response during the construction process. The risk of the bridge facing the typhoon during the construction process was evaluated. The result of the stress calculation shows that the stress of the measuring sections increased with the increasing of the typhoon level, while the relationship between the stress and the typhoon level is approximately linear. Under the combined action of the permanent loading and the typhoon loading, the stress of the measuring sections does not exceed the ultimate tensile stress of C55 concrete. The comparing result of the measured result and the calculated result proved that the measured stress under the effect of the typhoon was basically consistent with the calculated results, so the reliability of the finite element calculation was proved. The measured result is slightly less than the calculated result, which indicates that the structural performance under typhoon loading is reasonable.
引文
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[2] 周毅,孙利民,谢大圻.基于监测数据的跨海斜拉桥强/台风作用效应研究[J].土木工程学报,2014,47(2):93-102.
[3] 公路桥涵设计通用规范:JTG D60—2015[S].北京:人民交通出版社,2015.
[4] 公路桥梁抗风设计规范:JTG/T D60-01—2004[S].北京:人民交通出版社,2004.
[5] 曾宪武,韩大建.大跨桥梁风致抖振时域分析及在ANSYS中的实现[J].桥梁建设,2004(1):9-12.
[6] 廖丽恒,周岱,马晋,等.台风风场研究及其数值模拟[J].上海交通大学学报,2014,48(11):1541-1551.
[7] Yang T,Lei X T,Tang J.Asymmetrical structures of the temperature and humidity of tropical cyclones[J].Journal of Tropical Meteorology,2016,22(3):296-304.
[8] Tan C Y,Fang W H.Mapping the wind hazard of global tropical cyclones with parametric wind field models by considering the effects of local factors[J].International Journal of Disaster Risk Science,2018,9(1):86-99.
[9] 廖付塘.榕江特大桥施工阶段风振响应及抗风措施分析[J].公路交通科技(应用技术版),2016,12(7):177-178.
[10] McCullagh J J,Galchev T,Peterson R L,et al.Long-term testing of a vibration harvesting system for the structural health monitoring of bridges[J].Sensors & Actuators:A.Physical,2014,217:139-150.
[11] 苏鹏.连续刚构桥梁高墩悬臂施工监控与稳定性分析[J].水利与建筑工程学报,2016,14(3):216-220.
[12] 林涛.大跨度空腹式钢-混凝土混合连续梁桥钢箱梁长度参数分析[J].2018,16(6):94-98.
[13] 武电坤,杨兴,朱玉.马尾大桥跨江段主桥结构选型与设计[J].中外公路,2016,36(5):162-165.
[14] 林涛.马尾大桥跨江段施工方案应用研究[J].福建建筑,2018(1):66-69.
[15] 王义.某连续梁桥悬臂施工过程的仿真分析[J].水利与建筑工程学报,2012,10(4):106-109.