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振动台试验是研究结构抗震性能的重要方法。以单跨六层钢筋混凝土框架结构为例,对满足一致相似律的不同配重模型分别按构件等面积配筋率和按构件承载力相似原则进行配筋设计的缩尺模型与原型,采用有限元软件SAP2000和MSC.MARC分别进行了Pushover分析和弹塑性时程分析。分析结果表明:模型钢筋与原型钢筋性能相同(不完全满足相似关系)而模型混凝土性能满足相似关系要求时,按构件等面积配筋率配筋的缩尺模型不能正确反映原型的地震响应,高估原型的抗震能力;按构件承载力相似原则进行配筋设计能够较好地解决这一问题;当构件配筋率较高时,配重不足因素的影响小。针对按构件承载力相似原则配筋设计的方法,提出按模型钢筋弹性模量比修正杆件面积配筋率的改进建议。
Shaking table test is an important method to study the seismic performance of structures. Taking single-span six-story reinforced concrete frame structure as an example, for different weight models which meet the same similarity law, the scale model and the prototype of reinforcement design based on the reinforcement ratio of component equal area and the principle similar to the bearing capacity of component are respectively adopted. Meta-software SAP2000 and MSC.MARC respectively Pushover analysis and elastoplastic time history analysis. The results show that when the model steel and the prototype steel have the same properties (the relationship is not fully satisfied), and the performance of the model concrete meets the similar relationship, the scale model reinforced by the steel reinforcement with equal area can not correctly reflect the seismic response of the prototype, Estimating the seismic capacity of the prototype; Reinforcing the design according to the principle of bearing capacity of members is a good solution to this problem; When the reinforcement ratio is high, the impact of the lack of counterweight is small. Aiming at the method of reinforcement design based on the similar principle of bearing capacity of members, an improved proposal of modifying the reinforcement ratio of bar area according to the modulus ratio of steel reinforcement is proposed.