随机振动下多跨弹性支撑梁桥的冲击系数分析

发布时间：2019-04-22 08:03

【摘要】：基于随机振动理论和正交试验设计,研究了三跨弹性支撑梁桥的冲击系数及其影响因素。采用虚拟激励法求解桥梁在车辆和桥面不平顺作用下的随机响应,根据三倍标准差准则将桥梁挠度随机响应由统计结果转化为确定性值域,进而求得桥梁冲击系数。通过设计桥梁冲击系数影响因素的正交试验,研究了桥梁长度、桥梁刚度、桥面不平顺、车速、车体质量和车辆轴距对桥梁不同部位的冲击系数的影响规律及显著性。计算结果表明:算法高效、精确,有效克服多因素正交试验带来的庞大计算困难;桥梁不同部位的挠度冲击系数差异较大,且随着桥面不平顺等级的提高而增大;与其他因素相比,对冲击系数影响最为显著的是桥面不平顺,其次为桥梁长度和车速。
[Abstract]:Based on random vibration theory and orthogonal experimental design, the impact coefficient and its influencing factors of three-span elastic braced beam bridge are studied. The random response of bridge under irregularity of vehicle and deck is solved by virtual excitation method. According to the criterion of triple standard deviation, the random response of bridge deflection is transformed from statistical result to deterministic range, and then the impact coefficient of bridge is obtained. The influence of bridge length, bridge stiffness, bridge deck irregularity, vehicle speed, vehicle mass and vehicle wheelbase on impact coefficient of different parts of bridge is studied by orthogonal test of influencing factors of impact coefficient of bridge, the influence law and significance of bridge length, bridge stiffness, bridge deck irregularity, vehicle body mass and vehicle wheelbase on impact coefficient of bridge are studied. The results show that the algorithm is efficient, accurate and can effectively overcome the huge calculation difficulty caused by multi-factor orthogonal test, and the deflection impact coefficient of different parts of bridge varies greatly, and increases with the improvement of deck irregularity grade. Compared with other factors, the most significant influence on impact coefficient is deck irregularity, followed by bridge length and speed.
【作者单位】：重庆交通科研设计院桥梁工程结构动力学国家重点实验室;郑州大学力学与工程科学学院;
【基金】：桥梁结构抗震技术交通行业重点实验室开放基金(201402) 国家自然科学基金(11402235)
【分类号】：U441.3

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