人工地震波的模拟及其反应特征研究

从加速度反应谱出发,结合国内外人造地震波的主要合成方法,通过软件的拟合对比分析,研究讨论了一些参数对拟合结果的影响,并生成了与我国建筑抗震规范的标准反应谱拟合结果较好的人工地震波。还将其应用于苏州多处隧道与管廊实际工程的弹性动力时程分析中。根据实例分析结果表明:拟合的人工地震波用于时程分析,所得到的响应结果与反应谱法以及天然波分析得到的响应结果偏差较小,满足我国相应规范对时程分析的要求。

Simulation of Artificial Seismic Wave and Study of Its Reaction Characteristic

Based on the computational fluid dynamics CFD method, taking a landscape bridge to be constructed at a valley of Shenzhen as the study object, a three-dimensional segmental simulation model is established to study the aerodynamic performance. Firstly, the rationality of segment truss model is studied under the symmetric boundary condition, and it is concluded that the segment model can be used to replace the three-dimensional complete bridge for numerical simulation. Then, by comparing the three-dimensional complete bridge simulation with the selection method of aerodynamic parameters of truss bridge in the current domestic code, the inspection is made and the suggestions for improvement are put forward. The two-dimensional equivalent model is established by taking the outer contour and real area of the structural section of truss bridge as the control conditions. Four kinds of two-dimensional circular tube truss girder CFD calculation simplified model are used to calculate the static tripartite force coefficients of truss bridge at - 5°, -3°, 0°, 3° and 5° angles of attack. At the same time, based on an unsteady time history curve, the spatial flow structures and vortex-vibration performances of the four two-dimensional equivalent models are compared.