北京A380机库结构地震反应分析

Earthquake response analyses of Beijing A380 hangar structure

为检验位于首都机场的北京A380机库结构在地震作用下的安全性,采用振型分解反应谱法和弹性时程分析法计算该结构小震作用下的反应,采用基于静力弹塑性分析的能力谱法及动力弹塑性分析法计算该结构大震作用下的反应。结果表明:小震作用下,机库屋盖三层网架结构的中弦杆件受地震影响较大,三维地震作用下屋盖网架结构绝大多数杆件的内力大于单向地震作用下的内力,屋盖结构的水平地震反应大于竖向地震反应;大震作用下,支承屋盖结构的柱顶最大位移角远小于其限值,塑性铰主要分布在机库后墙x=122m、x=230m附近及大门开启边跨中的钢筋混凝土柱两侧的网架下弦杆件,钢筋混凝土柱刚进入屈服,结构整体刚度没有明显下降,结构整体尚未达到最大承载能力。北京A380机库结构设计达到预定的抗震设防性能目标。

To study the seismic safety of Beijing A380 hangar structure at Capital Airport response spectrum analysis and elastic time history analysis of the structure under the minor earthquake were carried, pushover analysis-based capacity spectrum method and dynamic elasto-plastic analysis method were adopted to perform the major earthquake response analysis of the structure. Under the minor earthquake, the middle chord members of the tri-layer space frame of the hanger roof structure have larger response; for most chord members the internal forces under three-dimensional earthquake input are larger than those under one-dimensional earthquake input; horizontal seismic response acts a dominant role for the hangar roof structure. Under the major earthquake, the maximum top drift angle of the supporting columns is much less than the limit value; most plastic hinges are formed on the bottom chord members close to the back wall and around the reinforced concrete column at the middle of the door opening side; the reinforced concrete column yields slightly; the overall stiffness of the structure has not obviously reduced and the maximum bearing capacity of the structure has not reached. The design of Beijing A380 hangar structure achieves the earthquake performance objectives.