摘要
高铁列车提速使声屏障动力问题凸显.以列车高速行驶时引发的直立式声屏障的动力放大系数为研究对象,探究直立式声屏障结构的振动特性及影响参数.首先,建立高铁桥上直立式声屏障有限元模型,分析其基本动力特性;然后,开展声屏障在400 km/h移动列车脉动风荷载时程作用下的振动规律研究,据此计算声屏障钢结构的动力放大系数;最后,针对声屏障的振动响应和动力放大系数开展多参数分析.结果表明:车速400 km/h时,5.0 m高声屏障立柱的动力放大系数约为2.76;声屏障安装位置距轨道中心线距离从3.8 m增大到4.7 m,弯矩响应的动力放大系数减小了0.3;2.3、3.3、5.0 m高声屏障立柱弯矩响应的动力放大系数分别为1.64、2.52、2.76,顶部的横向位移由0.45 mm增大至3.80 mm,根部弯矩则分别提高了26.8%和60.8%,增大声屏障高度不利于结构的振动特性.
The increasing speed of high-speed trains makes the dynamic problem of sound barriers prominent.In this study,the dynamic amplification factor of vertical sound barriers caused by high-speed trains was taken as the research object to explore the vibration characteristics and influencing parameters of vertical sound barriers.Firstly,the finite element model of the vertical sound barrier on a high-speed railway bridge was established,and its basic dynamic characteristics were analyzed.Then,the vibration law of the sound barrier under the fluctuating wind load of 400 km/h train was studied,and the dynamic amplification factor of the sound barrier steel structure was calculated based on it.Finally,the vibration response and dynamic amplification factor of the sound barrier were analyzed with multiple parameters.The results show that the dynamic amplification factor of the sound barrier column with a height of 5.0 m is about 2.76 when the train’s speed is 400 km/h.The distance between the installed sound barrier and the center line of the track is increased from 3.8 m to 4.7 m,and the dynamic amplification factor of the bending moment response is reduced by 0.3.The dynamic magnification factors of the bending moment responses of sound barrier columns with a height of 2.3,3.3,and 5.0 m are 1.64,2.52,and 2.76,respectively.The transverse displacement of the top is increased from 0.45 mm to 3.80 mm,while the bending moment of the bottom is increased by 26.8% and 60.8%, respectively. Increasing the height of the sound barrier is not conducive to the vibration characteristics of the structure.
作者
李小珍
张效邦
郑净
徐鸿
陈锋
LI Xiaozhen;ZHANG Xiaobang;ZHENG Jing;XU Hong;CHEN Feng(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Architecture and Civil Engineering,West Anhui University,Lu’an 237001,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2024年第6期1415-1422,共8页
Journal of Southwest Jiaotong University
基金
国家自然科学基金项目(52278463,52202422)。
关键词
高速铁路
铁路桥梁
直立式声屏障
脉动风荷载
动力响应
动力放大系数
high-speed railway
railroad bridge
vertical sound barrier
fluctuating wind load
dynamic response
dynamic amplification factor
