结构振动对风特性测试结果的影响研究  

Influence of structural vibration on measured results of wind characteristics

作　　者：程怀宇[1] 王浩[1] 肖士者[1] 郭彤[1] 邓稳平[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096

出　　处：《振动与冲击》2014年第15期49-53,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51378111);霍英东青年教师基金应用研究项目(142007);教育部新世纪优秀人才支持计划(NCET-13-0128);亚热带建筑科学国家重点实验室开放基金重点项目(2014KA04);中央高校基本科研业务费优秀青年教师项目(2242012R30002)

摘　　要：现场实测是获得结构所在地风特性的主要途径,因而实测数据的准确性至关重要。为了开展风特性精细化研究,重点分析了结构振动对所测数据的影响。通过实验测出相同风场内考虑和不考虑风速仪基底振动的风特性时程数据,分析对比了不同工况下获得的平均风速、紊流强度、紊流积分尺度及功率谱密度,其中基底分别输入了"韦帕"台风作用下润扬大桥主梁跨中横向振动和白噪声。结果表明,在基底输入主梁振动信号时,基底振动对实测平均风速以及紊流特性的影响程度均很小,但会导致实测紊流强度和顺风向功率谱密度略高于真实值。结论可为结构风场测试及数据分析提供参考。Field measurement is a main way to obtain wind characteristics of a structure site,thus the accuracy of measured data is very important. In order to conduct a refined study on wind characteristics,the influence of structural vibration on wind characteristics was analyzed specifically here. The wind time-history data in the same wind field were measured with and without anemometer-base vibrations. The wind characteristics including mean wind speed,turbulence intensity,turbulence integral scale and power spectral density in different cases were analyzed and compared. In tests,the measured lateral vibrations of the deck of Runyang Bridge under typhoon Wipha and the white noise were employed as the anemometer-base signal inputs. Results showed that structural vibration has little influence on the measured mean wind speed and turbulent wind characteristics when the measured lateral vibration of the deck is an input; however,it may make the turbulence intensity and power spectral density in along-wind direction slightly larger than the corresponding true values. Conclusions provided a reference for wind field measurement and data analysis of engineering structures.

关 键 词：结构振动 风特性 平均风速 紊流强度 紊流积分尺度 风速功率谱密度 

分 类 号：U448[建筑科学—桥梁与隧道工程] V321[交通运输工程—道路与铁道工程]