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首页> 外文期刊>Bulletin of earthquake engineering >A plastic-damage hysteretic model to reproduce strength stiffness degradation
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A plastic-damage hysteretic model to reproduce strength stiffness degradation

机译：一种塑料损伤滞后模型，可重现强度僵硬降解

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摘要

The need for proper nonlinear modelling of the structural damage resulting from strength and stiffness degradation observed at different levels of seismic intensity is essential in a comprehensive response assessment of a structural system. A nonlinear model based on plastic and damage mechanisms is presented here for seismic analysis of inelastic structures. To begin with, piecewise linearization of the initial backbone curve is carried out, each segment being defined by an in-parallel combination of elastic-perfectly plastic and elastic-softening damage mechanisms. The deterioration of the plastic and damage mechanisms is controlled by a damage index, which involves an accumulation rule of a damage parameter. Then, simulation of structural components is used to exemplify the reproduction of some hysteretic models with different types of degradation. Comparison with experimental results is subsequently carried out to calibrate the proposed model. Cyclic histories, with variable amplitude, are also considered to illustrate the effects of the plastic-damage mechanisms on the hysteretic response. Finally, nonlinear seismic analysis of a single-degree-of-freedom system, equivalent to an r.c. framed structure, is used to highlight the capability of the proposed approach in order to generate the capacity boundary curve starting from the initial backbone curve.
机译：在不同水平的地震强度观察到的强度和刚度降解所产生的结构损伤的适当非线性建模是必不可少的结构系统的综合反应评估。这里介绍了基于塑料和损伤机制的非线性模型，用于抗弹性结构的地震分析。首先，进行初始骨架曲线的分段线性化，每个段由弹性 - 完全塑料和弹性软化损伤机构的面对平行的组合限定。塑料和损坏机制的劣化由损伤指数控制，涉及损伤参数的累积规则。然后，使用结构部件的仿真来举例说明具有不同类型的劣化的一些滞后模型的再现。随后进行与实验结果的比较以校准所提出的模型。还认为具有可变幅度的循环历史，以说明塑料损伤机制对滞后反应的影响。最后，非线性地震分析对单一程度自由度的系统，相当于R.C.框架结构用于突出所提出的方法的能力，以便从初始骨干曲线开始产生容量边界曲线。

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