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首页> 外文期刊>Bulletin of earthquake engineering >Ductility reduction factors for steel buildings considering different structural representations
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Ductility reduction factors for steel buildings considering different structural representations

机译：考虑不同结构表示的钢结构的延性降低系数

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摘要

The global ductility parameter (mu(G)), commonly used to represent the capacity of a structure to dissipate energy, and its effects, considered through the ductility reduction factor (R-mu), are studied for buildings with moment resisting steel frames (MRSF) which are modeled as complex multi degree of freedom systems. Results indicate that the mu(G) value of 4, commonly assumed, cannot be justified, a value between 2.5 and 3 is suggested. The ductility reduction factors associated to global response parameters may be quite different than those of local response parameters, showing the limitation of the commonly used equivalent lateral force procedure (ELFP). The ratio (Q) of R-mu to mu(G) is larger for the models with spatial MRSF than for the models with perimeter MRSF since their ductility demands are smaller and/or their ductility reduction factors larger. According to the simplified Newmark and Hall procedure, the Q ratio should be equal to unity for the structural models under consideration. Based on the results of this study, this ratio cannot be justified. The reason for this is that single degree of freedom systems were used to derive the mentioned simplified procedure, where higher mode and energy dissipation effects cannot be explicitly considered. A value of 0.5 is suggested for Q for steel buildings with perimeter MRSF in the intermediate and long period regions. The findings of this paper are for the particular structural systems and models used in the study. Much more research is needed to reach more general conclusions.
机译：对于具有抗弯矩钢框架的建筑物，研究了通常用于表示结构耗能能力的整体延性参数（mu（G）），并通过延性降低因子（R-mu）考虑了其影响（ MRSF）建模为复杂的多自由度系统。结果表明，通常假设的mu（G）值4无法成立，建议使用2.5到3之间的值。与整体响应参数关联的延展性降低因子可能与局部响应参数完全不同，这表明了常用等效侧向力程序（ELFP）的局限性。具有空间MRSF的模型的R-mu与mu（G）之比（Q）比具有周边MRSF的模型大，因为它们的延性要求较小和/或延性降低因子较大。根据简化的纽马克和霍尔程序，对于所考虑的结构模型，Q比应等于1。根据这项研究的结果，该比例无法成立。这样做的原因是，使用单自由度系统来导出所提到的简化过程，其中无法明确考虑较高的模式和能量耗散效应。对于在中长期区域内具有周长MRSF的钢结构建筑，Q值建议为0.5。本文的发现适用于研究中使用的特定结构系统和模型。为了得出更一般的结论，需要做更多的研究。

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