摘要
为了填补当前国内外对飞机着陆跑道桥冲击系数研究的不足,对冲击系数的影响因素进行探究,并提出合理的冲击系数计算公式。首先,选取某机场五跨连续梁桥和民用飞机波音737-800为研究对象,基于有限元法和多体动力学法的联合仿真技术建立了精细化的飞机-桥梁耦合振动分析系统;然后,研究飞机着陆质量、俯仰角、下沉速度及桥梁刚度、桥梁阻尼等因素对飞机着陆时桥梁冲击系数的影响,揭示了其内在规律及机理;最后,开展统计分析,明确了桥梁冲击系数的分布特征,并选取逐步线性回归分析方法,进一步提出了飞机着陆连续梁桥的冲击系数回归模型。研究结果表明:飞机着陆质量、下沉速度、接地速度、滚转角及桥梁刚度、桥梁阻尼是影响冲击系数的重要因素;当飞机在桥梁上着陆时,冲击系数服从极值Ⅰ型分布,主要分布区间为0.28~0.79,最高可达2.07;所建飞机着陆连续梁桥的冲击系数回归模型与数值仿真结果平均差异率为5.13%,回归模型的拟合效果良好,该模型对预测飞机着陆冲击作用下跑道桥的冲击系数具有一定参考价值。
Here,to fill in current gaps in study on impact coefficient of aircraft landing runway bridge both domestically and internationally,influencing factors on impact coefficient were explored and a reasonable formula for calculating impact coefficient was proposed.Firstly,a 5-span continuous beam bridge and a civil aircraft Boeing 737-800 at a certain airport were taken as the study objects.Based on joint simulation technology of finite element method and multi-body dynamics method,a refined aircraft-bridge coupled vibration analysis system was established.Then,effects of factors of aircraft landing mass,pitch angle,sinking speed,bridge stiffness and bridge damping on bridge impact coefficient during aircraft landing were studied to reveal their inherent laws and mechanism.Finally,statistical analysis was performed to clarify distribution features of bridge impact coefficient,and the stepwise linear regression analysis method was selected to further propose the regression model for impact coefficient of continuous beam bridge during aircraft landing.The study results showed that aircraft landing mass,sinking speed,grounding speed,roll angle,bridge stiffness and bridge damping are important factors affecting impact coefficient;when an aircraft lands on a bridge,bridge impact coefficient obeys the extreme value type I distribution,its main distribution interval is 0.28-0.79 and up to 2.07;the average difference rate between the proposed regression model results and numerical simulation results for impact coefficient of continuous beam bridge during aircraft landing is 5.13%,the fitting effect of the regression model is good;the regression model has certain reference value for predicting impact coefficient of runway bridge under impact of aircraft landing.
作者
江辉
赵星燕
孙耀宗
孟宪锋
李会驰
罗萌
季金文
JIANG Hui;ZHAO Xingyan;SUN Yaozong;MENG Xianfeng;LI Huichi;LUO Meng;JI Jinwen(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;CCCC Highway Consultants Co.,Ltd.,Beijing 100010,China;China Airport Planning and Design Institute Co.,Ltd.,Beijing 100029,China;Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu 610041,China)
出处
《振动与冲击》
北大核心
2025年第3期140-149,170,共11页
Journal of Vibration and Shock
基金
民航安全能力建设项目(KK22015A-1804)
北京市企业技术中心科技研发课题(KY2021-6)。
关键词
跑道桥
冲击系数
联合仿真
飞机-桥梁耦合模型
动力响应
runway bridge
impact coefficient
co-simulation
coupling model of aircraft and bridge
dynamic response
作者简介
第一作者:江辉,男,博士,教授,1977年生,E-mail:jianghui@bjtu.edu.cn。
