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中文摘要：
针对现有Deodatis方法模拟大跨度桥梁空间脉动风场中存在的计算量问题，通过对谱分解矩阵引入插值近似，减少谱分解的次数，从而提高该谐波合成法的计算效率，并节省内存花费，实现了对三维宅间脉动风场的有效模拟。改进方法模拟的脉动风速样本仍保持各态历经性，且逐渐收敛到目标功率谱。用改进的Deodatis方法模拟了润扬长江悬索桥桥面主梁上作用的纵向脉动风速。结果表明，该改进措施对Deodatls方法的应用效果非常明湿，改进的Deodatis方法模拟脉动风速样本的相关函数与目标相关函数均吻合良好。尽管改进后的Deodatis方法对谱分解矩阵采用了插值近似，但模拟的随机风速样本仍具有很好的精度。
英文摘要：
In consideration of large computational efforts of Deodatis＇ simulation, a modified spectral representation method was proposed for simulating the fluctuating wind field of long span bridges. The Cholesky decomposition of cross spectral density matrix was approximated and reduced, and then the modified spectral representation method is efficient and requires less computer memory, which is suitable for simulating spatial wind fields of long span bridges. The sampling of fluctuating wind velocity simulated by the proposed method was ergodic and those power spectral densities converge to the target ones. Longitudinal wind velocities on the bridge deck of the Runyang Suspension Bridge were simulated using the proposed method. The results show that the modification technique aas excellent effects on Deodatis＇ simulation and there are good agreements between the simulated cot.elation functions and the target ones. It is noted that the influence of the interpolation approximatioa on the simulation accuracy of wind velocities is little.
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