Effects of non-stationary wind velocity models on buffeting performance of closed-box girder suspension bridges  

作　　者：Rui Zhou Yinan Lin Peng Lu Yongxin Yang Jinbo Zhu 

机构地区：[1]College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China [2]State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China

出　　处：《Advances in Aerodynamics》2023年第1期544-557,共14页空气动力学进展（英文）

基　　金：the National Natural Science Foundation of China(Nos.52278311,52178503,U2005216,and 51908374);the Guangdong Basic and Applied Basic Research Foundation(No.2023A1515030148);the Shenzhen Science and Technology Innovation Program(Nos.JCYJ20220531101609020,KQTD20200820113004005,and GJHZ20220913143006012);the Foundation of State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University(No.SLDRCE19-B-10);the National Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment.

摘　　要：Non-stationary characteristic in nature wind has a great effect on buffeting performance of long-span bridges.The influence of key parameters in non-stationary wind velocity models on nonlinear buffeting responses of a super long-span suspension bridge was investigated in this paper.Firstly,four non-stationary wind velocity models are established by combing the time-varying average wind velocity with an exponential function and the fluctuating wind velocity with four modulation functions,respectively.These non-stationary wind velocity models have obvious non-stationary characteristics and then are validated by the classical power spectrum densities.Finally,three displacement responses of the bridge deck under four different independent variables ofβin the exponential function and four modulation functions were compared,respectively.Results show that the turbulence intensities using two non-uniform modulation functions(NMF)are larger than those using uniform modulation functions(uMF).Moreover,the root mean square(RMS)values of three displacement responses increase with the decrease ofβ.Besides,the RMS values of three displacement under two NMFs are larger than those under two uMFs,and their RMS values under the second uMF are the smallest.

关 键 词：Suspension bridge Time-varying average wind velocity Uniform modulation function Non-uniform modulation function Non-stationary wind velocity Buffeting displacement response 

分 类 号：U44[建筑科学—桥梁与隧道工程]