多向地震耦合作用下高耸结构土-结构动力相互研究

研究了水平地震与竖向地震耦合作用下,考虑土-结构相互作用以及二阶效应对结构反应的影响。采用集总参数法,推导了结构在竖向地震和水平地震作用下的运动方程,对某高层建筑的地震反应进行了数值分析。结果表明:考虑土-结构相互作用使结构周期延长,变形增大;竖向地震作用使结构的地震反应有不同程度的增加;考虑二阶效应后结构的位移反应以及层间剪力增加。故在设计建筑在软土地基上的高层及高耸结构时,应该考虑结构的重力二阶效应,考虑其对结构的整体稳定性的不利影响。

INVESTIGATING THE SOIL-STRUCTURE DYNAMIC INTERACTION FOR TALL BUILDINGS UNDER COUPLED ACTION OF MULTI-DIRECTIONAL EARTHQUAKE

The influence of soil-structure dynamic interaction on structural responses is investigated. The equations of motion are derived under vertical and horizontal earthquake loadings. The seismic responses of high-rising structure are numerically simulated and the results show that the interaction prolongs the period of the structure and increases the deformation. The vertical earthquake increases the response of the structure to some degree. The displacement and the shear forces between floors are larger if the gravity P-A effect is considered. A conclusion is drawn that the gravity P-A effect should be considered and it will have adverse effect on the whole stabilization on tall buildings on soft soil.