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An energy-based damage model for seismic response of steel structures

机译：钢结构地震反应的基于能量的损伤模型

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摘要

This paper proposes a new model for quantifying the damage in structural steel components subjected to randomly applied flexural/shear stress reversals, such those induced by earthquakes. In contrast to existing approaches that consider the damage as a combination of the global amount of dissipated energy and maximum displacement, the proposed model represents the damage by two parameters: (a) the total dissipated energy and (b) the portion of the energy consumed in the skeleton part of the load-displacement curve. These parameters are employed to define a single 'damage index', which measures the level between 0 (no damage) and 1 (failure). The proposed model takes into account that the ultimate energy dissipation capacity of the steel component is path-dependent and can change throughout the entire response duration. The new model is derived from low-cycle fatigue static tests of round steel rods and steel plates subjected to bending and shear. The accuracy of the model is verified experimentally through dynamic real-time shaking table tests. From these tests, it is observed that the proposed model measures the level of damage at any stage of the loading process reasonably well and predicts the failure of the structural component accurately. The model can be easily implemented in a computer program to assess the level of seismic damage and the closeness to failure in new structures or to evaluate the safety of existing ones.
机译：本文提出了一种新的模型，用于量化结构钢构件受到随机施加的弯曲/剪切应力反转（例如地震引起的应力）的破坏。与将损坏视为总耗散能量和最大位移的组合的现有方法相比，建议的模型通过两个参数来表示损坏：（a）总耗散能量和（b）消耗的能量部分在载荷-位移曲线的骨架部分。这些参数用于定义单个“损坏指数”，该指数测量介于0（无损坏）和1（失败）之间的水平。所提出的模型考虑到钢构件的最终能量消散能力与路径有关，并且在整个响应期间都可能发生变化。新模型源自对圆钢和钢板进行弯曲和剪切的低周疲劳静态测试。通过动态实时振动台测试，通过实验验证了模型的准确性。从这些测试中可以看出，所提出的模型可以合理地很好地测量加载过程中任何阶段的损坏程度，并可以准确地预测结构部件的故障。该模型可以很容易地在计算机程序中实现，以评估地震破坏的程度和新结构失效的可能性，或者评估现有结构的安全性。

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