摘要
为探讨箱梁的结构噪声及其影响因素,以跨度32 m的混凝土简支箱梁为研究对象,采用混合有限元-边界元法进行数值仿真,并进行了现场试验验证.在此基础上,探讨了板厚和腹板倾角对箱梁结构噪声的影响规律.研究结果表明:混合有限元-边界元法适用于箱梁的结构噪声分析;箱梁振动和结构噪声的主要频率范围分别为40.0～125.0 Hz和31.5～100.0 Hz,底板附近在63.0 Hz出现噪声峰值;增大板厚能降低箱梁结构噪声,且增大顶板厚度最有效;当腹板倾角为0°～12°时,箱梁的结构噪声较小.
In order to research on structure-borne noise of box-girder and its influence factors, a simply-supported concrete box-girder with a span of 32 m was selected as the case study, its structure- borne noise was simulated by means of hybrid FEM-BEM method, and the computed results were validated by field measurements. On this basis, the influence laws of plate thickness and dip angle of web on structure-borne noise were probed into. The research results show that the dominate frequency ranges of box-girder vibration and structure-borne noise are 40.0 to 125.0 Hz and 31.5 to 100.0 Hz, respectively, and the peak frequency of noise around the bottom plate is 63.0 Hz. The structure-borne noise decreases with the increase of plate thickness, and the addition of top plate thickness is the most effective noise-reduction measure. The preferable dip angle of web is 0° to 12° for lower structure- borne noise of box-girder.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2013年第3期409-414,共6页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(51008250)
新世纪优秀人才支持计划资助项目(NCET-10-0701)
国家863计划资助项目(2011AA11A103)
高等学校博士点基金资助项目(20110184110020)
关键词
箱梁
结构噪声
振动
数值仿真
现场试验
影响因素
box-girder
structure-borne noise
vibration
numerical simulation
field measurement
influence factor
