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首页> 外文期刊>Bulletin of earthquake engineering >Assessment of hysteretic damping in reinforced concrete structures using local hinge characteristics
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Assessment of hysteretic damping in reinforced concrete structures using local hinge characteristics

机译：利用局部铰链特性评估钢筋混凝土结构中滞回阻尼的评估

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摘要

Performance-based seismic engineering is nowadays adopted for economical design of structures to resist earthquakes and it requires nonlinear static pushover analysis to be performed. In this approach, the energy dissipation due to nonlinear behavior of the structures is taken into account by obtaining the equivalent viscous damping and this damping is evaluated from the global pushover curve of the structures. However, the global structural damping is basically due to energy dissipation at local joints of the structures deforming beyond yield rotation. This paper presents the methodology of estimating equivalent damping from the local hinge characteristics of the structures at element level by carrying out Pushover analysis of three structures viz 3D six storeyed, 2D two storeyed and a simple column RC structure. This damping is assessed by considering cumulative hysteretic energy dissipated at all the plastic hinges developed in the structures and is compared with that calculated based on formulations given in codes such as FEMA-440 and ATC-40. Damping agrees well with that given in FEMA-440, estimated from global pushover curve of structures for ductility value greater than 3. Also, nonlinear time history analysis is performed for all the structures to validate the structural performance.
机译：目前，基于性能的抗震工程被用于抗震结构的经济设计，需要进行非线性静力pushover分析。在该方法中，通过获得等效粘性阻尼来考虑结构非线性行为引起的能量耗散，并从结构的整体pushover曲线来评估该阻尼。然而，整体结构阻尼基本上是由于结构的局部接缝处的能量耗散，变形超过屈服旋转。本文通过对三维六层、二维两层和简单柱钢筋混凝土结构三种结构进行Pushover分析，提出了在单元水平上根据结构的局部铰链特性估算等效阻尼的方法。通过考虑结构中形成的所有塑性铰处耗散的累积滞回能量来评估该阻尼，并将其与根据FEMA-440和ATC-40等规范中给出的公式计算的阻尼进行比较。阻尼与FEMA-440中给出的阻尼一致，根据延性值大于3的结构整体推覆曲线估算。此外，还对所有结构进行了非线性时程分析，以验证结构性能。

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