学术论文

      罕遇地震下钢混组合结构损伤时变特性

      Time-dependent damage characteristics of steel-concrete composite structures under rarely occurred earthquake

      摘要:
      面向复杂钢混组合结构,依据动力弹塑性时程分析法获得罕遇地震下结构的动力响应,分别利用基于整体法和加权组合法的地震损伤时变模型,研究了罕遇地震下结构的损伤时变特性.考虑到结构刚度和阻尼等参数在计算时必须为常量,而在整个服役期间又具有变量特征,因此将其作为拟变量处理.通过研究一典型钢混组合算例发现:罕遇地震下结构损伤值呈现显著的时变特性,甚至可能超出相应性能限值;刚度变化会引起抗侧向力能力和地震传导能力的改变,使得时变损伤值呈现波动性,其中前者占主导作用.地震作用越大,地震传导能力变化对损伤影响越大,导致时变损伤值波动越显著,结构振动形态也发生显著变化.通过对比服役期内结构时变损伤与不考虑材料时变特性的设计值的差异可以发现,材料的时变特性对于抗震设计和评估的准确性有重要影响.
      Abstract:
      For steel-concrete composite structure, the dynamic elastic-plastic time history analysis method is utilized to obtain the structural dynamic response under the rarely occurred earthquake.The seismic damage time-dependent model, which integrates global method and weighting combination method, respectively, is utilized to study the structural damage time-dependent characteristics under the rarely occurred earthquake.Considering that the parameters such as the stiffness and the damping are constants in the calculation but have the variable characteristics in the whole service period, they are treated as pseudo variables.A typical steel-concrete composite sample is studied.The results show that the damage has significantly time-dependent characteristics under rare earthquake and maybe exceeds the performance limits specified in the code.The stiffness change can cause the changes of lateral resistance force and earthquake conduction ability, thus leading to the significant fluctuations of the time-dependent damage.The influence of lateral resistance force on damage plays a dominant role.The more severe the earthquake, the greater the effect of earthquake conduction ability on damage.This can lead to more significant fluctuation of damage and vibration shapes.Comparing the time-dependent damage values and the design values without considering material time-dependent characteristics, it can be found that the material time-dependent characteristics have an important effect on the accuracy of the seismic design and evaluation.
      作者: 王莹 [1] 王若竹 [2] 李兆霞 [1]
      Author: Wang Ying [1] Wang Ruozhu [2] Li Zhaoxia [1]
      作者单位: 东南大学江苏省工程力学分析重点实验室,南京,210096 常州市机关事务管理局,常州,213001
      年,卷(期): 2017, 47(4)
      分类号: O346.1
      在线出版日期: 2017年8月15日
      基金项目: 国家自然科学基金资助项目,中央高校基本科研业务费专项资金资助项目