天津站斜拉天桥的动力测试与抗风分析

DYNAMIC TEST AND ANTI-WIND ANALYSIS OF CABLE-STAYED PEDESTRIAN OVERCROSSING AT TIANJIN RAILWAY STATION

天津站斜拉天桥是目前我国跨径最大的人行天桥。由于功能要求 ,全桥设有PE喷涂网罩 ,并在局部区域设有PC耐力板罩 ,使得该桥在抗风验算上具有很强的特殊性。首先 ,采用∏式模型对该桥进行建模 ,并对天津站天桥的动力特性进行了现场测试 ;其次 ,应用Davenport谱给出了脉动风荷载互功率谱密度函数 ,并结合M .Shinozuka方法产生了各点的脉动结构风荷载 ,并在此基础上对该桥进行了动力时程分析 ;最后 。

The cable\|stayed pedestrian overcrossing at Tianjin Railway Station is the longest\|span pedestrian overcrossing in our country.For the reason of function,PE painted screen is erected for the full overcrossing with PC plate in its partial area,which makes itself peculiar,especially in anti\|wind.Firstly this paper adopts ∏\|model to model the bridge,and gives the result of on\|spot testing on the dynamic character.Secondly,this paper gives the pulsation wind pressure inter\|power spectrum density function by using Davenport Spectrum,and pulsation structural wind pressure of each point by using the method of M.Shinozuka,based on which the time history analysis of dynamic force is given.Lastly,the paper analyzes the flexion\|torsion coupling buffeting of the overcrossing.