双优化POD法在复杂屋盖风压场模拟中的应用

Application of the Double Optimized Orthogonal Decomposition Technique in the Simulation of Wind Pressure on the Complex Roof

在复杂屋盖结构中,导入测点面积和脉动风压自根方差进行双优化POD处理。在此基础上以双优化中荷载本征模态为对象,运用两种插值方法进行了风荷载模拟。同时将实测风压与两种插值方法模拟风压进行均值、根方差、风压时程方面的比较。结果表明双优化POD法基础上插值模拟风荷载实现了较理想的模拟效果。但是两种插值方法与节点位置的模拟效果存在个体差异。整体上看受湍流作用小的节点位置无论采用插值法1还是插值法2,模拟效果均好于湍流区节点;就插值方法而言,在湍流效应明显节点处,采用插值法2模拟效果好于1。同时在风荷载分布梯度较小节点处采用插值法1模拟效果好于2,而风荷载分布梯度较大节点处插值法2模拟效果好于1。

In complex roof structures, the measuring point area and wind pressure of double root variance optimization can be input to carry out using the double optimized orthogonal decomposition technique. Taking the intrinsic load mode in the double optimization as the object, two kinds of interpolation methods were employed to simulation the wind load. At the same time, the average, root variance and wind pressure duration were compared with the simulated wind pressures using the two interpolation methods on. The results show that the interpolated wind load based on the double optimized orthogonal decomposition technique can achieve an ideal prediction effect. However, there are differences in the simulation results and the node position between the two interpolation methods. On the whole, the simulation effect at the zone with less turbulence is better than the turbulent zone node for the node position for both the interpolation method 1 and method 2;If the interpolation method is concerned,the interpolation method 2 is better than the method 1 in the turbulent zone nodes. At the same time, the interpolation method 1 is better than the 2 in the zone with a small wind load distribution gradient, but at the node, when the wind load distribution gradient is large, the interpolation method 2 is better than the method 1.