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An accurate strength amplification factor for the design of SDOF systems with P-Δ effects

机译：用于设计具有P-Δ效应的SDOF系统的精确强度放大系数

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摘要

The response of structures subjected to seismic actions is always influenced by P-A effects. The importance of this effect is generally modest for structures experiencing an elastic response but often relevant for structures responding well within the inelastic range of behaviour. Seismic codes indicate that P-A effects may be counterbalanced through an increase in the structural strength required by a first order analysis. This increase is calculated by means of a strength amplification factor. The expressions suggested in codes for this factor are simplistic and often criticized by researchers. In this paper, the effectiveness of some of the provisions reported in the literature or suggested in seismic codes is evaluated on single degree of freedom systems with different periods of vibration. As suggested by past studies, attention is focused on the influence of the interstorey drift sensitivity coefficient, significant duration of the ground motion, class of the site soil, displacement ductility and equivalent viscous damping ratio of the system. Finally, an accurate expression of the strength amplification factor is proposed.
机译：受地震作用的结构的响应始终受P-A效应的影响。对于具有弹性响应的结构，此效果的重要性通常不高，但对于在行为的非弹性范围内具有良好响应的结构，通常是很重要的。地震代码表明，通过一级分析所需的结构强度的增加，可以抵消P-A效应。该增加通过强度放大因子来计算。代码中针对该因素建议的表达方式过于简单，并且经常遭到研究人员的批评。在本文中，在具有不同振动周期的单自由度系统上评估了文献中报告或地震法规中建议的某些规定的有效性。正如过去的研究表明的那样，注意力集中在层间漂移敏感性系数，地震动的持续时间，场地土壤的类别，位移延性和系统的等效粘性阻尼比的影响上。最后，提出了强度放大因子的精确表达式。

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