重载与氯盐环境下混凝土桥梁疲劳损伤当量分析研究
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摘要
国、省道公路混凝土桥梁因劣化环境及车辆超载导致的结构损伤问题尤为突出,需建立较为实用的混凝土桥梁疲劳损伤分析方法,并能与治超管理相协调。首先提出混凝土桥梁疲劳损伤当量分析方法,以一座预应力混凝土连续箱梁桥为例,研究超载作用下的桥梁疲劳损伤发展规律;在此基础上,考虑氯盐环境下性能退化,以钢筋脱钝时间和保护层胀裂时间作为界限时间点,分析各时间阶段内重载作用下的预应力混凝土桥梁疲劳损伤发展规律。结果显示:车辆荷载与疲劳损伤之间存在着非线性指数发展规律,考虑氯盐与重载作用下的预应力混凝土桥梁疲劳损伤当量参数b_f值的三阶段变化反映了预应力筋锈蚀对结构性能的影响。
The problem of structural damage caused by vehicle overloading and chloride environment has been particularly acute in concrete bridges of national and provincial roads. A convenient and accurate fatigue damage analysis method for concrete bridge is expected to be well coordinated with overload management. In the paper,an equivalent fatigue damage analysis method was proposed. A prestressed concrete box-girder bridge was applied to study the evolution of equivalent fatigue damage. Moreover,the performance degradation due to chloride environment was also taken into consideration. Under the combined action of overloading and chloride environment,taking the depassivation time of steel bar and expasion and cracking time of protective layer as the time points,the fatigue damage evolutions of prestressed concrete bridge in each stage were analyzed. The results showed that there was exponential growth between the vehicle load and the fatigue damage. Under chloride and overloading environment,the three stages of the parameter b_f in the equivalent fatigue damage function reflects the influence of prestressed steel corrosion on the structural performance.
The problem of structural damage caused by vehicle overloading and chloride environment has been particularly acute in concrete bridges of national and provincial roads. A convenient and accurate fatigue damage analysis method for concrete bridge is expected to be well coordinated with overload management. In the paper,an equivalent fatigue damage analysis method was proposed. A prestressed concrete box-girder bridge was applied to study the evolution of equivalent fatigue damage. Moreover,the performance degradation due to chloride environment was also taken into consideration. Under the combined action of overloading and chloride environment,taking the depassivation time of steel bar and expasion and cracking time of protective layer as the time points,the fatigue damage evolutions of prestressed concrete bridge in each stage were analyzed. The results showed that there was exponential growth between the vehicle load and the fatigue damage. Under chloride and overloading environment,the three stages of the parameter b_f in the equivalent fatigue damage function reflects the influence of prestressed steel corrosion on the structural performance.
引文
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[2]刘扬,张海萍,邓扬,等.考虑车辆超载的公路简支梁桥疲劳性能[J].浙江大学学报(工学版),2015,49(11):2172-2178.
[3]BASTIDAS-ARTEAGA E,BRESSOLETTE P,CHATEAUNEUFA,et al.Probabilistic Lifetime Assessment of RC Structures Under Coupled Corrosion-Fatigue Deterioration Processes[J].Structural Safety,2009,31(1):84-96.
[4]MAO J H,XU F Y,JIN W L,et al.Research on the Fatigue Flexural Performance of RC Beams Attacked by Salt Spray[J].China Ocean Engineering,2018,32(2):179-188.
[5]田飞龙,李国平,张春雷.一般大气环境中混凝土桥梁长期受力性能分析[J].同济大学学报(自然科学版),2015,43(4):483-489.
[6]张春雷.考虑环境和受力损伤作用的混凝土桥梁结构性能分析方法[D].上海:同济大学,2013.
[7]中国工程建设标准化协会.混凝土结构耐久性评定标准:CECS 220∶2007[S].北京:中国建筑工业出版社,2007.
[8]VU K A,STEWART M G.Structural Reliability of Concrete Bridges Including Improved Chloride-Induced Corrosion Models[J].Structural Safety,2000,22:313-333.
[9]田浩.给定寿命期内混凝土桥梁性能演变分析[D].上海:同济大学,2009.
[10]张喜刚.公路桥梁汽车荷载标准研究[M].北京:人民交通出版社,2014.
[11]李永强,车惠民.在等幅重复应力作用下混凝土弯桥疲劳性能研究[J].铁道学报,1999,21(2):76-79.
[12]马林.国产1860级低松弛预应力钢绞线疲劳性能研究[J].铁道标准设计,2000(5):21-23.
[13]吴雪峰.锈蚀钢绞线力学性能和粘结性能研究[D].长沙:中南大学,2014.
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