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首页> 外文期刊>Bulletin of earthquake engineering >Displacement-based design procedure of damped braces for the seismic retrofitting of r.c. framed buildings
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Displacement-based design procedure of damped braces for the seismic retrofitting of r.c. framed buildings

机译：钢筋混凝土抗震加固的阻尼支撑基于位移的设计程序框架建筑

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摘要

The insertion of damped braces proves to be very effective for enhancing the performance of a framed building under seismic loads. For a widespread application of this technique suitable design procedures are needed. In this paper a design procedure which aims to proportion damped braces to attain a designated performance level of the structure, for a specific level of seismic intensity, is proposed. In particular, a proportional stiffness criterion, which assumes the elastic lateral storey-stiffness due to the braces proportional to that of the unbraced frame, is combined with the displacement-based design, in which the design starts from a target deformation. To check the effectiveness and reliability of the design procedure, a six-storey reinforced concrete plane frame, representative of a medium-rise symmetric framed building, is considered as primary structure. This, designed in a medium-risk seismic region, has to be retrofitted as in a high-risk seismic region by the insertion of braces equipped with either metallic-yielding dampers or viscoelastic ones. Nonlinear dynamic analyses of unbraced and damped braced frames are carried out, under real (set A) and artificially generated (set B) ground motions, by a step-by-step procedure. Frame members and hysteretic dampers are idealized by bilinear models, while the viscoelastic dampers are idealized by a six-element generalized model describing the variation of the mechanical properties depending on the frequency, at a given temperature.
机译：事实证明，插入阻尼支撑对于提高框架结构在地震荷载下的性能非常有效。对于该技术的广泛应用，需要合适的设计程序。在本文中，提出了一种设计程序，该程序旨在按比例分配阻尼支撑，以针对特定的地震强度水平达到结构的指定性能水平。特别是，比例刚度标准与基于位移的设计相结合，该比例刚度标准假定由于支撑与未支撑框架的支撑成比例而产生的弹性横向储层刚度，该设计基于目标变形。为了检查设计程序的有效性和可靠性，以六层高的钢筋混凝土平面框架为代表，该建筑代表了中层对称框架式建筑。在中等风险地震区中设计的这种装置，必须像插入高风险地震区那样，通过插入装有金属屈服阻尼器或粘弹性阻尼器的支架进行翻新。通过分步过程，在真实（A组）和人工生成（B组）地面运动的情况下，对无支撑和阻尼支撑框架进行了非线性动力学分析。框架构件和滞回阻尼器通过双线性模型理想化，而粘弹性阻尼器通过六元素广义模型理想化，该模型描述了给定温度下机械性能随频率的变化。

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