基于混联Ⅱ型惯容系统的既有钢筋混凝土框架结构减震加固设计方法研究
郭雪媛, 李向民, 许清风, 冷予冰, 张睿
结构工程师 ›› 2025, Vol. 41 ›› Issue (05) : 212 -221.
基于混联Ⅱ型惯容系统的既有钢筋混凝土框架结构减震加固设计方法研究
Research on Design Method of Reinforcement for Existing Reinforced Concrete Frame Structures Based on Series-Parallel-Ⅱ Inerter System
本文针对既有钢筋混凝土框架结构轻量化调谐减震加固的需求,提出一种基于混联Ⅱ型惯容系统的性能化减震加固设计方法。本研究建立了附加混联Ⅱ型惯容系统的钢筋混凝土框架结构动力学模型,通过定义无量纲化参数惯质比、附加阻尼比和刚度比,得到结构位移传递函数的表达式。在此基础上,基于传递函数在定点处达到局部峰值的原则,推导惯容系统最优参数设计公式,提出基于惯容系统的既有钢筋混凝土框架结构性能化减震加固设计流程。以上海某五层教学楼为工程案例,该教学楼根据所提方法加固后结构一阶自振周期仅偏移1%,表明惯容系统调谐减震设计未显著改变原结构动力特性;弹塑性时程分析结果表明,罕遇地震下结构X、Y向最大层间位移角分别由1/111和1/130降至1/303和1/280,降幅超过57%,满足轻度损坏的性能目标,验证了所提方法可以在保持既有结构自振周期不变的条件下,实现既有钢筋混凝土框架结构抗震性能提升。
To address the need for lightweight tuned seismic retrofitting of existing reinforced concrete (RC) frame structures, this study proposes a performance-based seismic retrofitting design method utilizing a series-parallel-Ⅱ inerter system. A dynamic model of an RC frame structure equipped with the series-parallel-Ⅱ inerter system is established. By defining dimensionless parameters including the inertance ratio, damping ratio, and stiffness ratio, the structural displacement transfer function is derived. Based on the principle that the transfer function reaches local peaks at fixed points, optimal design formulas for the inerter system parameters are deduced. A performance-based retrofitting design framework for existing RC frame structures is subsequently proposed. Taking a five-story school building in Shanghai as an engineering example, the retrofitted structure exhibits only a 1% shift in its fundamental natural period, indicating that the tuned design of the inerter system preserves the original dynamic characteristics. Elastoplastic time-history analysis shows that the maximum inter-story drift ratios of the structure in the X- and Y-directions under rare earthquakes were reduced from 1/111 and 1/130 to 1/303 and 1/280, respectively, corresponding to reductions exceeding 57%. These results satisfy the performance objective of minor damage under rare earthquakes, validating the effectiveness of the proposed method in enhancing seismic performance while maintaining the inherent dynamic properties of existing structures.
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