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Non-linear seismic behavior of structures with limited hysteretic energy dissipation capacity

机译：滞回耗能有限的结构的非线性地震行为

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This paper investigates the non-linear seismic behavior of structures such as slender unreinforced masonry shear walls or precast post-tensioned reinforced concrete elements, which have little hysteretic energy dissipation capacity. Even if this type of seismic response may be associated with significant deformation capacity, it is usually not considered as an efficient mechanism to withstand strong earthquakes. The objective of the investigations is to propose values of strength reduction factors for seismic analysis of such structures. The first part of the study is focused on non-linear single-degree-of-freedom (SDOF) systems. A parametric study is performed by computing the displacement ductility demand of non-linear SDOF systems for a set of 164 recorded ground motions selected from the European Strong Motion Database. The parameters investigated are the natural frequency, the strength reduction factor, the post-yield stiffness ratio, the hysteretic energy dissipation capacity and the hysteretic behavior model (four different hysteretic models: bilinear self-centring, with limited or without energy dissipation capacity, modified Takeda and Elastoplastic). Results confirm that the natural frequency has little influence on the displacement ductility demand if it is below a frequency limit and vice versa. The frequency limit is found to be around 2 Hz for all hysteretic models. Moreover, they show that the other parameters, especially the hysteretic behavior model, have little influence on the displacement ductility demand. New relationships between the displacement ductility demand and the strength reduction factor for structures having little hysteretic energy dissipation capacity are proposed. These relationships are an improvement of the equal displacement rule for the considered hysteretic models. In the second part of the investigation, the parametric study is extended to multi-degree-of-freedom (MDOF) systems. The investigation shows that the results obtained for SDOF systems are also valid for MDOF systems. However, the SDOF system overestimates the displacement ductility demand in comparison to the corresponding MDOF system by approximately 15%.
机译：本文研究了具有滞回能量消散能力的细长非增强砌体剪力墙或预制后张预应力钢筋混凝土构件等结构的非线性地震行为。即使这种类型的地震响应可能与较大的变形能力相关联，通常也不会将其视为抵抗强地震的有效机制。研究的目的是为这种结构的地震分析提出强度折减系数的值。研究的第一部分集中于非线性单自由度（SDOF）系统。通过计算非线性SDOF系统的位移延展性需求来进行参数研究，该非线性SDOF系统针对从欧洲强运动数据库中选择的164个记录的地面运动进行了计算。所研究的参数为固有频率，强度折减系数，屈服后的刚度比，磁滞能量耗散能力和磁滞行为模型（四种不同的磁滞模型：双线性自定心，具有有限或无能量耗散能力，已修改武田和弹塑性）。结果证实，如果固有频率低于频率极限，则固有频率对位移延性要求几乎没有影响，反之亦然。对于所有滞后模型，发现频率极限约为2 Hz。而且，他们表明，其他参数，尤其是滞后行为模型，对位移延性要求的影响很小。提出了滞回耗能小的结构位移延性要求与强度折减系数之间的新关系。这些关系是对考虑的滞后模型的等位移规则的改进。在调查的第二部分中，参数研究扩展到多自由度（MDOF）系统。调查表明，从SDOF系统获得的结果对于MDOF系统也有效。但是，与相应的MDOF系统相比，SDOF系统高估了位移延展性需求约15％。

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