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动静力混合分析是评价和预测结构震后破损状态的方法之一,由动力分析转向静力分析时,需要对结构的动力状态进行静态化处理,消除外部动力作用、阻尼力、惯性力及恢复力,保留退化后的刚度、已有变形和各种损伤。在现有动静力混合分析方法基础上,提出将地震动记录终止点置零、增加自由振动段消除阻尼力和惯性力、施加等效荷载消除恢复力三项改进措施,自由振动段采用有阻尼的自由振动方法估算持时,等效荷载输入时调整动、静力数据格式和分析步长,基于CANNY程序通过编程来实现上述过程。所提方法可用于结构震后破损评价、震后鉴定与加固、试验模拟、性能化设计及健康监测等领域,其评价标准建议考虑性能目标及结构部位的不同。最后,以一实际震后结构为例,探讨了改进方法在实际工程中应用的可行性,其分析和评价结果与实际吻合。
Hybrid analysis of static and dynamic forces is one of the methods to evaluate and predict the damage state of post-earthquake structures. When the dynamic analysis is turned to static analysis, the dynamic state of the structure needs to be statically treated to eliminate external dynamic forces, damping forces, inertial forces and recovery Force, to retain the stiffness after degradation, has been deformed and a variety of injuries. Based on the existing hybrid methods of static and dynamic forces, this paper puts forward three measures: zeroing the end point of ground motion recording, increasing the damping force and inertia force of the free vibration section, and restoring force by applying equivalent load. The free vibration section adopts damping The free-vibration method estimates the holding time and the equivalent load input to adjust the dynamic and the static data format and the analysis step length. The above process is realized through programming based on the CANNY program. The proposed method can be used in the field of post-earthquake damage assessment, post-earthquake identification and reinforcement, experimental simulation, performance-based design and health monitoring. The evaluation criteria suggest different performance goals and different structural parts. Finally, taking an actual post-earthquake structure as an example, the feasibility of applying the improved method in practical engineering is discussed. The results of analysis and evaluation are consistent with the actual situation.