柱承式筒仓结构在地震作用下的累积损伤分析和试验研究

Column bearing type of silo structure is taken as the research background. The failure characteristic, earthquake response regularity and cumulative damage evaluation of pie silo structure under two earthquakes action, are studied through theoretical analysis and experimental study.The main content of this project is as following. 1) Based on the model similarity law, the shaking table test of Column bearing type of silo structure under two earthquakes action, is carried out. Then, the dynamic properties, the failure characteristics and the lateral pressure change regularity of silo structure are stuied. 2) Combining the experimental study and the numerical simulation results, the earthquake response regularity and earthquake resistant behavior of silo structure under two earthquakes are studied. And the calculation method and. 3) With the cumulative damage model,the cumulative damage is analyzed based on rigidity deterioration and energy index. The damage development process and the final cumulative damage degree of damaged silo structure when subjected to the secondary earthquake, is studied. 4) In the end, on the basis of cumulative damage evaluation , the seismic resistant performance of silo structure under two earthquakes action is revealed. The research results of this project are expected to resolve basic problem of resistant earthquake design of silo structure. And it can provide scientific basis for seismic strengthening and the revision of seismic design codes of silo structure effected damage.

以柱承式筒仓结构为研究背景，采用理论分析和试验研究相结合的方法，研究二次地震作用下柱承式筒仓结构的破坏特征、地震响应规律、累积损伤。主要研究内容包括：1）基于模型试验相似律，对柱承式筒仓结构进行二次地震作用下的振动台模型试验，研究不同贮料状态的柱承筒仓结构的动力特性、破坏特征以及筒内侧压力的变化规律。2）利用有限元数值模拟，结合振动台模型试验结果，揭示柱承式筒仓结构在二次地震作用下的地震响应规律和抗震性能。3)建立筒仓结构累积损伤模型，基于刚度退化和能量指标进行二次地震作用下的累积损伤分析，分析一次地震作用后的已损伤筒仓结构在经受二次地震作用时损伤发展过程和最终累积损伤程度。4）在前述研究的基础上，揭示二次地震作用下基于累积损伤的柱承式筒仓结构抗震性能。研究成果可望解决二次地震作用下筒仓结构抗震设计中的基本问题,为震后已损伤筒仓结构的抗震加固和筒仓结构抗震规范的修订提供科学依据。

以柱承式筒仓结构为研究背景，采用理论分析和试验研究相结合的方法，研究二次地震作用下柱承式筒仓结构的破坏特征、地震响应规律、累积损伤。 主要内容和研究结论如下：1）完成了二次地震作用下柱承式筒仓结构的振动台试验，研究了不同贮料状态的柱承筒仓结构的动力特性、破坏特征以及筒内侧压力的变化规律。2）结合振动台模型试验结果，通过有限元数值模拟，揭示柱承式筒仓结构在二次 地震作用下的地震响应规律和抗震性能。3)建立筒仓结构累积损伤模型，基于刚度退化和能量指标进行了二次地震作用下的累积损伤分析，分析一次地震作用后的已损伤筒仓结构在经受二次地震作用时损伤发展过程和最终累积损伤程度。4）综合以上研究结果，总结揭示了二次地震作用下基于累积损伤的柱承式筒仓结构抗震性能。以上研究成果可望解决二次地震作用下筒仓结构抗震设计中的基本问题，为震后已损伤筒仓结构的抗震加固和筒仓结构抗震规范的修订提供科学依据。