Buffeting responses characteristics of long-span flexible bridges under non-Gaussian wind field
To evaluate the buffeting responses characteristics of long-span flexible bridges under non-Gaussian wind load,long-span coastal cable-stayed and suspension bridges were taken as examples,and Gaussian wind field and non-Gaussian wind field at bridges sites were generated based on frequency-wavenumber spectrum method.The buffeting responses and their statistical characteristics of two bridges under Gaussian and non-Gaussian wind fields were analyzed,respectively.The influence of two important parameters(i.e.the height of stiffener beam from water surface and ground roughness)on buffeting responses of bridges were also dis-cussed.The results show that all the displacement responses of two bridges are close to a normal distribution under the Gaussian wind field,but not under the non-Gaussian wind field.The lateral displacement of the main beam of the cable-stayed bridge under non-Gaussian wind field is slightly larger than that under Gaussian wind field.However,the root mean square(RMS)value of the torsional displacement of the main beam of the suspension bridge under Gaussian wind field is significantly larger than that under non-Gaussian wind field,and the lateral displacement under Gaussian wind is slightly larger than that under non-Gaussian wind field.Besides,with the decrease of the height of the stiffener girders from the water surface or the increase of the ground roughness,only the RMS values of the lateral displacement for the cable-stayed bridge slightly become larger.However,the RMS values of the torsional displacement for the suspension bridge obviously become larger,and their RMS values of the vertical displacement slightly become larger.
万方数据
维普
