【摘要】 对构造典型的大跨度飞机库采用反应谱法和时程分析法,考虑单向、双向和三向地震输入,计算对比结构各部位的地震反应,并进行这两种方法之间的比较。表明,对大跨度飞机库支承柱内力及柱顶位移,多维地震影响主要体现为水平次方向输入对主方向地震反应的影响。当主方向沿结构对称轴方向时,使柱沿主方向的内力及柱顶位移明显增大,而主方向沿非对称轴方向时这种影响较小;竖向地震对下部支承结构的影响可忽略;机库屋盖结构不同部位分别受水平和竖向地震控制,三向输入时地震内力比单独水平和竖向地震下均显著增大;采用时程分析时上述规律比反应谱法的结果更显著。据此给出了大跨度飞机库抗震设计计算的有关建议。更多还原

【Abstract】 Structural responses of a typical large-span hangar subjected to one-,two-,and three-dimensional(1D,2D and 3D) seismic excitations,respectively,are analyzed and compared with each other,using both response spectrum method and time-history analysis method,and then,the results from the two methods are compared.It shows that,for lateral displacements of the structure and forces of the columns,the effect of multi-earthquake inputs is mainly due to the influence of the input in the secondary horizontal direction on the above responses in the corresponding primary direction.When the primary direction is along the symmetrical axis of the hangar,compared with 1D inputs,multi-dimensional inputs increase responses in the main direction obviously.When it is along the non-symmetrical axis,such effect is not important;vertical input is also negligible for them.Forces in different parts of the roof are controlled by horizontal or vertical inputs,respectively,and,compared with those from horizontally or vertically 1D inputs,responses from 3D inputs are increased;The above effects from time-history analyses are more significant than those from response spectrum method.Based on these observations,some suggestions for seismic design of large-span hangars are then proposed.更多还原