摘要
针对车桥耦合作用下钢混组合梁桥竖向振动响应及冲击效应问题,运用ANSYS软件建立有限元模型,基于分离迭代法编写车桥耦合振动求解程序,采用Newmark-β法求得不同因素下钢混组合梁桥边跨跨中竖向位移响应并据此评价行人舒适度.结果表明:车速变化对钢混组合梁桥竖向振动影响较小;车重对该桥型竖向振动影响比较明显;桥面不平顺是该桥型竖向振动最重要的影响因素.重车过桥时,宜将车速限值在40~60 km/h范围内,可有效减少对桥梁的冲击,同时桥面不平顺对冲击系数有明显影响,要加强桥面养护;桥面不平顺是求得的冲击系数数值解和规范限值之间产生差异的最重要影响因素.
Aiming at the vertical vibration response and impact effect of steel-concrete composite girder bridge under the coupling of vehicle and bridge,the ANSYS software was used to establish the finite element model,and the vehicle-bridge-coupled vibration-solving program was compiled based on a separation iteration method.The Newmark-βmethod was used to solve the mid-span vertical displacement response of side span of steel-concrete composite girder bridge under different factors.In addition,the pedestrian comfort was evaluated based on the vertical displacement response.The results show that the change of vehicle speed has less effect on the vertical vibration of steel-concrete composite girder bridge;the vehicle weight has a significant effect on the vertical vibration of above-mentioned bridge type;the bridge surface roughness is the most important factor influencing the vertical vibration of above-mentioned bridge type.When a heavy vehicle crosses the bridge,the speed limit should be within the range from 40 km/h to 60 km/h,which can effectively reduce the impact on the bridge.Meanwhile,the bridge surface roughness has a significant influence on the impact coefficient,and the maintenance of bridge surface should be emphasized.Furthermore,the bridge surface roughness is the most important factor resulting in the difference between the numerical solution and the standard value of impact coefficient.
作者
李喜梅
徐伟
母渤海
LI Xi-mei;XU Wei;MU Bo-hai(Western Engineering Research Center of Disaster Mitigation in Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology,Lanzhou 730050,China;China Municipal Engineering Northwest Design&Research Institute Co.Ltd.,Lanzhou 730050,China)
出处
《沈阳工业大学学报》
CAS
北大核心
2022年第2期227-233,共7页
Journal of Shenyang University of Technology
基金
国家自然科学基金项目(51808274).
关键词
钢混组合梁桥
车桥耦合振动
桥面不平顺
NEWMARK-Β法
分离迭代法
路面功率谱
行人舒适度
冲击系数
steel-concrete composite girder bridge
vehicle-bridge-coupled vibration
bridge surface roughness
Newmark-βmethod
separation iteration method
pavement power spectrum
pedestrian comfort
impact coefficient
