| 引用本文: | 李岩,张振浩,林国伟,林雪琦,丁勇,叶长允.基础冲刷对多种车激作用下桥梁动力行为的影响[J].哈尔滨工业大学学报,2021,53(9):17.DOI:10.11918/202012024 |
| LI Yan,ZHANG Zhenhao,LIN Guowei,LIN Xueqi,DING Yong,YE Changyun.Scour effect on dynamic performance of bridges under excitations of vehicles with various driving conditions[J].Journal of Harbin Institute of Technology,2021,53(9):17.DOI:10.11918/202012024 |
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| 基础冲刷对多种车激作用下桥梁动力行为的影响 |
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李岩1,张振浩1,林国伟2,林雪琦1,丁勇3,叶长允2
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(1.哈尔滨工业大学 交通科学与工程学院,哈尔滨150090;2. 济南城建集团有限公司,济南250000; 3.哈尔滨工业大学 土木工程学院,哈尔滨 150090)
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| 摘要: |
| 为探究基础冲刷与桥梁车激动力行为变化的内在关系,推进基于动力的冲刷识别研究,建立可模拟移动车辆匀速、制动和变速行驶激励的车桥耦合振动分析模型,依托预应力混凝土连续梁桥工程实例,通过数值仿真方法系统研究了基础冲刷对不同行驶状态车辆激励下桥梁动力行为时域和频域特性的影响规律。结果表明:受冲刷桥墩的局部振动模态频率随冲刷深度增加而明显减小,未受冲刷桥墩的模态频率无明显变化。随冲刷深度由1 m增加至4 m,多种行驶状态车辆激励下,桥梁墩顶的纵向位移和加速度响应峰值均显著增大；同一冲刷水平下,车辆制动激励下墩顶纵向位移和加速度响应的峰值最大,且相较于无冲刷工况,响应峰值增幅分别线性增加至72.72%和56.26%；同时,冲刷敏感响应的频谱幅值显著上升,中心频率向低频偏移。研究结果将为基于车激动力响应的桥梁基础冲刷识别提供可行的动力指标和理论基础。 |
| 关键词: 车辆 多种行驶状态 车桥耦合振动 基础冲刷 下部结构 |
| DOI：10.11918/202012024 |
| 分类号:U441.3 |
| 文献标识码:A |
| 基金项目:国家自然科学基金 (52078164)； 黑龙江省自然科学基金(LH2019E049)； 山东省住房和城乡建设厅科技计划(2019-k4-1) |
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| Scour effect on dynamic performance of bridges under excitations of vehicles with various driving conditions |
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LI Yan1,ZHANG Zhenhao1,LIN Guowei2,LIN Xueqi1,DING Yong3,YE Changyun2
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（1. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China; 2. Jinan Urban Construction Group, Jinan 250000, China; 3. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China)
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| Abstract: |
| To investigate the scour effect on the changes in the vehicle-induced dynamic behaviors of bridges, and to promote the research on the scour diagnosis based on vibrations, a vehicle-bridge coupled vibration analysis model was established which can simulate the excitations of vehicles with various driving conditions (i.e., uniform speed, different speeds, and braking). The influence law of the vehicle-induced dynamic behaviors of a prestressed concrete continuous bridge in time domain and frequency domain was analyzed through numerical simulation. Results show that the local vibration mode frequency of the scoured piers decreased significantly with the increase in the scour depth, and the mode frequency of the non-scouring piers showed no evident change. As the scour depth increased from 1 m to 4 m, the longitudinal displacement and acceleration response peaks of the pier tops increased obviously under the excitations of vehicles in various driving states, and the response peak was the largest at braking under the same scouring condition. Compared with the non-scouring condition, the longitudinal displacement and acceleration response peak grew linearly with an increase of 72.72% and 56.26% respectively. Moreover, the spectral amplitude of the scouring sensitive response increased significantly, and the center frequency shifted to low frequency. The results can provide theoretical basis and index reference for the foundation scour diagnosis of bridges based on vehicle-induced dynamic responses. |
| Key words: vehicle various driving conditions vehicle-bridge coupled vibration foundation scouring substructure |
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