考虑车桥耦合效应的大跨悬索桥钢-混组合梁疲劳损伤评估

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摘要为了研究不同疲劳车辆荷载作用下大跨度悬索桥钢-混组合梁的疲劳寿命，以及在考虑车桥耦合效应变化时运营期内钢-混组合梁疲劳损伤累积变化规律，以某主跨720米的悬索桥为例进行了分析。首先基于局部梁段有限元模型静力分析确定了疲劳细节关注点，得出相应的应力集中系数；然后利用P-M及CDM两种评估模型对疲劳荷载模型Ⅲ、AASHTO规范标准疲劳车及河北省疲劳荷载谱三类疲劳车辆荷载作用下的疲劳损伤度及疲劳寿命进行了评估；最后考虑车桥耦合动力效应分析了车辆载重量、行车速度、桥面铺装恶化及未来交通量增长对结构运营期内的疲劳损伤累积的影响。结果表明，该类钢-混组合梁悬索桥疲劳状态评估最不利梁段为1/8跨处，易发生疲劳破坏的节点为靠近吊点位置的主梁顶板与腹板连接处。疲劳荷载模型Ⅲ与当地疲劳荷载谱作用下的疲劳损伤量比较接近，AASHTO疲劳车作用下的损伤累积量明显低于另外两类。不同部位疲劳细节关注点的累积损伤量变化趋势与速度的关系不太明确，行车载重量、交通量增长以及桥面铺装恶化均加速疲劳损伤累积的增长。

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	朱劲松1
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关键词 ：悬索桥, 钢-混组合梁, 车桥耦合效应, 疲劳损伤评估, 影响因素

Abstract：In order to study the fatigue life of steel-concrete composite beams of long-span suspension bridges under different fatigue vehicle loads and the cumulative variation of fatigue damage during operation period considering the change of vehicle-bridge coupling effect. Taking a suspension bridge with a main span of 720 meters as the engineering background, the fatigue details are determined based on the static analysis of the finite element model of the local beam section, and the corresponding stress concentration factor is obtained. Then the fatigue damage degree and fatigue life of fatigue load model III, AASHTO standard fatigue vehicle and Hebei Province fatigue load spectrum are evaluated by using P-M and CDM evaluation models. Finally, considering the vehicle-bridge coupling dynamic effect, the effects of vehicle load, vehicle speed, deck pavement deterioration and future traffic growth on fatigue damage accumulation during the operation period of the structure are analyzed. The results show that the most disadvantageous section for fatigue assessment of steel-concrete composite beams is 1/8 span, and the joints prone to fatigue damage are the joints of the main girder roof and web near the suspension point. Fatigue load model III is close to the fatigue damage under local fatigue load spectrum, and the damage accumulation under AASHTO fatigue vehicle is significantly lower than that under the other two categories. The relationship between cumulative damage change trend and speed of fatigue details in different parts is not clear. The cumulative increase of fatigue damage is accelerated by the increase of vehicle load, traffic volume and deterioration of bridge deck pavement.

Key words： Suspension bridge Steel-concrete composite beam Vehicle-bridge coupling effect Fatigue damage assessment influence factor

收稿日期: 2019-09-09 出版日期: 2021-03-15

引用本文:

朱劲松1,2,香超1，祁海东3. 考虑车桥耦合效应的大跨悬索桥钢-混组合梁疲劳损伤评估[J]. 振动与冲击, 2021, 40(5): 218-229.
ZHU Jinsong1,2, XIANG Chao1, QI Haidong3. Fatigue damage evaluation of steel-concrete composite beam of long-span suspension bridge considering vehicle-bridge coupled effect. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(5): 218-229.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I5/218

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