摘要
本文通过对一单层柱面网壳缩尺模型进行小幅值正弦波扫频和不同强度的地震模拟振动台试验,系统研究了单层网壳结构自振特性、弹性及弹塑性抗震性能,观察其塑性发展过程和破坏特征,并采用ANSYS软件对试验结果进行了进一步的分析和验证。研究表明,网壳结构频谱密集,地震响应复杂,水平与竖向位移响应同一量级;强震作用下仍具有良好的抗震性能和较大的安全储备;破坏前经历较充分的塑性发展过程,破坏的真正原因是结构塑性发展和位形变化的交互作用;同时,试验数据与ANSYS的理论计算结果吻和较好,说明采用数值模拟方法对网壳这类复杂结构进行破坏机理的研究具有重要意义。
This paper introduces a series of shaking table experiments of a shrunk model of single layer latticed cylindrical shell by inputting small amplitude sinusoidal waves and gradually increased earthquake records. Plastic development processes and failure characteristics of such structures were investigated as well as natural vibration behavior, elastic and elastoplastic aseismic behavior. In addition, FEM software ANSYS was applied to checking experimental result. The study revealed that space frames are structures with intensive frequency spectrum and complex seismic response regularity. Both horizontal and vertical displacement response due to earthquakes can not be ignored. There are excellent aseismic behavior, safety reserve and a sufficient plastic development process before the failure appears. In fact, the failure of space frames is caused by the incessant interactive actions of the plastic development and deformation. Furthermore, the agreement between calculated result and experimental result showed the significant meaning of performing numerical analysis to study the failure mechanism of space frames.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2004年第6期1-8,共8页
Journal of Building Structures
基金
国家自然科学基金资助项目(50278020)
