大跨度桥梁风场模拟及气动力计算

介绍了一种快速高效的用于大跨度桥梁风致振动分析的风场模拟方法，并对模拟风场的统计性质进行了讨论和验证。在此基础上进一步给出了大跨度桥梁抖振力和自激力的时域表达方式，其中针对自激力计算中涉及的参数识别问题，提出了一种简单实用的非线性参数识别方法，本文采用上述理论，获得了作用于香港汀九大桥上的风场和气动力，据此对大桥进行的抖振响应时域分析表明，计算结果与风洞试验结果吻合良好，说明文中述及的这套理论已达

SIMULATION OF WIND FIELD AND CALCULATIONOF AERODYNAMIC FORCES FORLONG-SPAN BRIDGES

An efficient wind field simulation technique for wind-induced vibration analysis of long- span bridges is first introduced in this paper, and the statistic characteristics of the simulated windfield are then discussed. On this basis, the time-domain expressions for the buffeting and self-ex-cited forces acting on long-span bridges are further given. A simple and practical method is pre-sented for the non-linear parameter identification involved in the calculation of self-excited forces.By using the above theory, the wind field and aerodynamic forces acting on the Hong Kong TingKau Bridge are obtained. The time-domain buffeting response analysis of the bridge shows thatthe analytic results agree quite well with the experimental ones. This indicates that the theorypresented in this paper has reached a practical level.