超高层筒体结构模型振动台地震破坏试验研究

就超高层筒体结构在地震作用下的动力特性与破坏反应,对一个1∶50比例的超高层建筑模型进行了微震、强震直至破坏的振动台试验研究。试验通过满足弹性—重力相似条件得到原型结构在地震作用下的动力特性与破坏现象。结果表明,结构的横向二阶以上及竖向一阶振动对结构的抗震安全性起控制作用,结构中上部是抗震薄弱部位,试验破坏现象与实际震害吻合。

Shaking Table Test Study of Seismic Damage of a High Rise Tube-Structure Model

A 1∶50 scale high rise residential building model made of PMMA is tested on shaking table to simulate the whole dynamic response process of a reinforced concrete high rising tube structure. The seismic excitation is simulated from slight vibration to intense shock in order to test the dynamic performance and the damage response of the model structure from linear elastic stage to damage and to destruction stage. The El-Centro wave and field wave are selected as the inputting excitation. The dynamic characteristics and destruction phenomena of the proto tube structure such as frequency, damping ratio, acceleration amplitude coefficient, distribution of strain, acceleration and displacement along height of structure with the increasing seismic excitation are obtained by the elastic-gravity similarity condition. The result of this test shows that this structure is similar to a vertical bending cantilever beam component. Under the earthquake, the peripheral walls have more intensive response than the core tube wall. This structure is asymmetrical, but there is no obvious torsion response. While shaking in the direction of asymmetrical axis, its response is less intensive than shaking in the symmetrical direction. This structure is obviously dominated by higher order horizontal vibration-modes and first order vertical vibration mode. The weak floors of earthquake resistance are located at the upper-middle part of the building which coincides with the real earthquake damage phenomena.