风荷载作用下高层建筑系统的模型分析

风荷载是随机变化的。考虑风荷载的随机性以及土-结构相互作用的计算方法对结构进行分析,与实际情况更接近。文中首先对风荷载的处理方法和土-结构体系的阻尼作分析,然后考虑脉动风的空间相关性应用谐波叠加法编制matlab程序模拟脉动风速时程。进而,分析刚性地基模型和土-结构模型的动力特性。以此为基础,对两种模型进行动力和静力分析。分析表明,地基土对结构整体的动力性能影响显著,土-结构模型的结构顶面最大水平位移比刚性地基模型的大,基底剪应力比刚性地基模型的小。

HIGH-RISE OVERALL RESPONSE UNDER WIND LOAD

Wind load changes randomly. Considering the randomness of the wind and soil-structure, structural analysis is realistic. First, wind load and damping of soil-structure were processed. Second, wind speed-time curves were simulated applying harmonic superposition method by matlab. Third, struc- tural dynamic properties were analyzed of rigid foundation and soil-structure model. Finally, static and dynamic analyses of the models were processed. The results show that soil is significantly on structural dynamic property. The maximum horizontal displacement of soil-structure is more than rigid foundation model＇s, but base shear stress is less.