压力积分法在桥梁断面雷诺数效应研究中的应用

表面压力积分方法不仅可以得到气动力均值,更重要的是可获得气动力的时程,从而可以计算气动力的RMS值和频率。通过该方法得到了刚性支撑断面的斯特罗哈数,并在试验雷诺数为2.7×104~1.4×106范围内研究了斯特罗哈数随雷诺数的变化规律。研究中发现扁平桥梁断面的斯特罗哈数有明显的雷诺数效应,而雷诺数为2×105~4×105区域内这一效应尤为明显。

Application of pressures integration in effeets of bridge decks

In order to obtain the dynamic response of torsionally asymmetric buildings including the soil-structure interaction effect,a simplified method using modal decomposition and the Fourier transform algorithm is presented.The matrix formulation employed in this method produces a better approximation with less computational effort.This numerical parametric study shows that the horizontal displacement and rocking rotation of the foundation increases respectively as a result that the ratio of structure mass to foundation mass and the ratio of structure height to gyration radius increase,especially if the shear wave velocity is lower than 1000 m/s.For a medium highrise building with moderate or large eccentricity that is supported on a moderately or very flexible foundation medium,the influence of increased torsional loadings on the combined lateral torsional responses must be taken into account.