摘要
针对现有地震损伤模型的不足,从能量耗散角度认为损伤的形式和程度与结构理想弹性变形能和实际弹塑性变形能之间的差异相关,可以用该差值的变化率表征损伤演变。从静力和动力耗能角度分别阐述地震损伤模型的力学机理和计算方法,提出了利用多次弹塑性动力时程分析方法计算理想弹性变形能、整体屈服初始时刻,进而获得结构损伤演变过程的方法。通过对比各种损伤模型特性和不足,论证该模型的优越性,并进而定义结构不同破坏等级的损伤性能目标。最后,通过钢筋混凝土剪力墙及框架结构静动力弹塑性分析验证了该能量损伤模型的准确性、全面性和实用性。
To improve the performance-based seismic design（PBSD）method,it is necessary to evaluate the actual seismic damage state of components and structures according to the accurate seismic damage model or the damage index.There are several disadvantages for current seismic damage models,such as dynamic mechanism,threshold range,accuracy and suitability.According to the insufficiency of the existing models,the damage form and the degree is supposed to has substantial connection with the difference between the ideal elastic deformation energy and the actual elastic-plastic deformation energy from the viewpoint of energy dissipation.Thus the differential ratio can be used to represent the damage evolution.The mechanism and the computational method of the damage model based on energy is discussed from the viewpoint of static and dynamic energy dissipation,respectively.The damage evolution method based on differential ratio of elastic plastic dissipated energy is proposed,and the ideal elasticity energy and the overall initial yield time is obtained by multiple elastic-plastic dynamic time-history analysis.Through the comparison of the characteristics and shortcomings among various models,the advantages of the proposed model is discussed and demonstrated.The range of energy damage index for different damage gradeis defined.Finally,the accuracy,universality and feasibility of the energy model are verified by the static and dynamic inelastic analysis of reinforced concrete shear wall and frame structures.
作者
何浩祥
陈奎
范少勇
HE Hao-xiang;CHEN Kui;FAN Shao-yong(Beijing Key Lab of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China;Beijing Collaborative Innovation Center for Metropolitan Transportation,Beijing 100124,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2018年第3期382-390,共9页
Journal of Vibration Engineering
基金
国家重点研发计划(2017YFC1500600)
国家自然科学基金资助项目(51478024)
关键词
抗震设计
地震损伤模型
损伤指数
滞回耗能
地震
seismic design
seismic damage model
damage index
hysteretic energy
earthquake
