AEROELASTIC SENSITIVITY ANALYSIS OF LONG-SPAN SELF-ANCHORED SUSPENSION BRIDGES UNDER CONSTRUCTION

摘要

As is well known, the construction of self-anchored suspended bridge different from that of earth- anchored suspended bridge. The cables are anchored inside the girder. The girder must bear strong axial force. Therefore, the deck must be constructed under the condition of without cables at first. The Sanchaji Bridge over Xiangjiang River in Hunan China with 328m main span length and the total length of the main bridge 732m and opened to the traffic in Sep. 2006 The bridge adopts launching method, the steel box girders exceeding 700m is launched step by step. The bridge is the longest and the largest span self-anchored steel girder by launching in China s by launching in China. It is important that careful study of their resistance and response to site winds. A method based aeroelastic sensitivity analysis has been established that self-anchored suspension bridges are more vulnerable to dynamic wind action during erection. The aforementioned method has been applied in this research to a real suspension bridge where experimental data at different construction stages was available.