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Evaluation of the Seismic Retrofitting of Mainshock-Damaged Reinforced Concrete Frame Structure Using Steel Braces with Soft Steel Dampers
Applied Sciences ( IF 2.838 ) Pub Date : 2021-01-18 , DOI: 10.3390/app11020841
Fujian Yang , Guoxin Wang , Mingxin Li

Most reinforced concrete (RC) frames would exhibit different degrees of damage after mainshock excitations, and these mainshock-damaged RC (MD-RC) frames are highly vulnerable to severe damage or even complete collapse under aftershock excitations. In the present study, the effectiveness of utilizing soft steel damper (SSD) as a passive energy dissipation device for seismic retrofitting of MD-RC frame under aftershock actions was investigated. A common three-story RC frame in the rural area was employed and a numerical evaluation framework of retrofitting analysis of the MD-RC frame was also proposed. Based on proposed evaluation framework, nonlinear dynamic time history analysis of the MD-RC frame with and without retrofitting schemes was conducted to evaluate the retrofit effect of the retrofitting schemes on the MD-RC frame. The results revealed that the retrofitting schemes could effectively improve the natural vibration characteristics of the MD-RC frame, especially the first-order natural frequency with a maximum increase of nearly four times. The retrofit effect of the MD-RC frame under pulse-like aftershocks is better than non-pulse-like aftershocks and the retrofit effect of minor damage MD-RC frame is slightly better than that of severe damage. In addition, only retrofitting the bottom story of MD-RC frame might cause aggravate structural damage.

中文翻译:

软钢阻尼器带钢支撑的主震损伤钢筋混凝土框架结构抗震性能评估

大多数钢筋混凝土(RC)框架在主震激发后会表现出不同程度的损坏,这些主震损坏的RC(MD-RC)框架极易受到严重破坏,甚至在余震激发下完全坍塌。在本研究中,研究了利用软钢阻尼器(SSD)作为被动耗能装置在余震作用下对MD-RC框架进行抗震改造的有效性。采用了农村地区常见的三层RC框架,并提出了MD-RC框架改造分析的数值评估框架。基于提出的评估框架,对带有或不带有改型方案的MD-RC框架进行了非线性动态时程分析,以评估改型方案对MD-RC机架的改型效果。结果表明,改进方案可以有效改善MD-RC框架的固有振动特性,尤其是一阶固有频率,最大增加了近四倍。MD-RC框架在脉冲状余震下的改装效果要好于非脉冲状余震,轻度损坏的MD-RC框架的改装效果稍好于严重破坏的效果。此外,仅翻新MD-RC机架的底部可能会加剧结构损坏。MD-RC框架在脉冲状余震下的改装效果要好于非脉冲状余震,轻度损坏的MD-RC框架的改装效果稍好于严重破坏的效果。此外,仅翻新MD-RC机架的底部可能会加剧结构损坏。MD-RC框架在脉冲状余震下的改装效果要好于非脉冲状余震,轻度损坏的MD-RC框架的改装效果稍好于严重破坏的效果。此外,仅翻新MD-RC机架的底部可能会加剧结构损坏。
更新日期:2021-01-18
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