上海环球金融中心结构模态测试

上海环球金融中心作为巨型柱、巨型斜撑、带状桁架以及核心筒构成的三维巨型框架-筒形式的钢与混凝土混合结构,系目前我国大陆最高的超高层建筑,结构材料和形式有大胆创新。结构模态系衡量结构分析结果可靠性的重要参数,通过合理选择传感器和数据采集器,克服了长周期、信号弱的困难,经现场测试得到了结构双向平动和扭转振动频率和振型。这些信息可以作为结构设计人员确认或改进设计阶段结构分析结果的依据,也可作为设计类似超高层建筑时估计地震和风荷载的参考。

Structural Modes Identification of Shanghai Global Financial Center

Structural Modes are determined by stiffness and mass distribution of a certain building; they are usually used for estimation of earthquake or wind response. Field measurement of structural modes can help engineers to check their analysis results during design stage. Shanghai Global Financial Center is a 101 stories composite structure of reinforced concrete and steel with total height of 492 meters. Modes of two orthogonal horizontal and torsional directions are obtained by employing force-balanced accelerometers and data logger with very high resolution. Results show that the first natural period of the structure is as long as 6.7 second; the first two modal frequencies are very similar despite the quite difference of structural configuration in X and Y direction. Comments on test techniques and test results are presented.