钢筋混凝土框架—核心筒结构模拟地震倒塌试验研究

Shaking Table Test Study of Earthquake Collapse of a Reinforced Concrete Frame-core Tube Structure

钢筋混凝土框架-核心筒结构是高层建筑结构中常用的结构形式。如何有效地探寻此类结构体系在强震作用下的倒塌机理是目前高层及超高层结构抗震性能评估的核心问题之一。设计了1:15的框架-核心筒结构模拟地震振动台试验,该结构底层一个角柱由千斤顶代替,通过千斤顶卸载模拟结构角柱破坏在地震作用等偶然作用下的破坏;再输入31个地震工况直至结构倒塌破坏,模拟角柱失效后结构在地震中的破坏以及倒塌过程。试验分析表明,底层柱的失效加剧了地震作用破坏的集中效应,底层竖向构件严重破坏并最终导致结构倒塌。

The reinforced concrete frame-core tube structure is a general structural form used in high-rise building. One of the essential problems in high-rise building is to understand the collapse mechanism in earth- quake effectively. This paper designs a shaking table test to study a frame-core tube structure with the geomet- ric similarity ratio 1： 15, and one corner column is replaced by a screw jack. The unloading of the jack is used to simulate the failure of the corner column. 31 seismic waves were input in series till the structure collapses, which simulates the damage and collapse of the structure during earthquakes when the frame corner column is totally damaged. The analyses indicate that the failure of the column at first floor increases the concentrated damage of the first floor structure. The damage of the vertical component eventually causes the structural col- lapse.