CAJ | 학술논문

针对平行双幅桥梁存在的气动干扰现象，采用节段模型测力风洞方法研究气动干扰效应对双幅断面气动导纳影响。结果表明，由于气动干扰作用，双幅断面气动导纳与单幅断面气动导纳存在一定差别，尤其阻力气动导纳；相同外形断面产生的气动干扰效应相似，不同外形断面产生的气动干扰效应不同；由于下游断面对上游断面气动干扰影响较弱，不同间距引起的气动干扰对上游断面气动导纳影响无明显规律；随间距的增大气动干扰对下游断面气动导纳影响逐渐减弱，间距足够大时，此影响可忽略不计。
침대평행쌍폭교량존재적기동간우현상，채용절단모형측력풍동방법연구기동간우효응대쌍폭단면기동도납영향。결과표명，유우기동간우작용，쌍폭단면기동도납여단폭단면기동도납존재일정차별，우기조력기동도납；상동외형단면산생적기동간우효응상사，불동외형단면산생적기동간우효응불동；유우하유단면대상유단면기동간우영향교약，불동간거인기적기동간우대상유단면기동도납영향무명현규률；수간거적증대기동간우대하유단면기동도납영향축점감약，간거족구대시，차영향가홀략불계。
The aerodynamic admittance describes the transfer behavior between wind spectra and buffeting forces spectra,which directly determines the precision of the buffeting response prediction.Due to the aerodynamic interference effect on the paralleled double bridges,the aerodynamic admittances of windward and leeward girders will be different from that of single girder.And the aerodynamic interference effect is related to the shapes of girders and distance between girders.An practical engineering was taken as a background,and the aerodynamic interference effect on the aerodynamic admittances was investigated by the method of sectional model force measurement in wind tunnel test.It is shown that there are some differences between the aerodynamic admittances of double girders and single girder because of the aerodynamic interference effect.The aerodynamic interference effect caused by girders with different shape of sections will be different.The aerodynamic interference caused by girders different distances apart affects the windward girder weakly, so there is no obvious change of the aerodynamic admittances of windward girder.With the increase of distance between windward and leeward girders,the aerodynamic interference effect on the aerodynamic admittances of leeward girder weakens gradually and can be ignored while the distance is large enough.