Abstract The improved fish-bone (IFB) model for seismic analysis of older and contemporary reinforced concrete frames is proposed by introducing a new procedure for the estimation of parameters of structural elements of the fish-bone model. The procedure makes it possible to approximately account for the importance of structural elements on the seismic response of a frame building and the effect of potential redistribution of demands between structural elements of the frame building. Firstly, the IFB model is described. Follows demonstration of its capability by simulating the response history of storey shears, storey drifts and storey accelerations of selected pseudo-dynamically tested frames. Finally, it is shown that the IFB models can provide pushover curves, the corresponding damage states and fragility functions based on response history analysis which are very similar to those obtained by the conventional multi-degree-of-freedom models. The capability of the IFB model with respect to conventional fish-bone model is also demonstrated by the pushover analysis. It can be observed that the IFB model significantly improves the simulation of the older reinforced concrete frames, which do not fulfil the strong column – weak beam concept, and the frames for which the columns or beams of one storey of a frame building differ significantly from each other. Additional research is needed to extend the capabilities of simplified structural models to plan irregular frame building.

中文翻译：

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使用改进的鱼骨模型对旧式和现代钢筋混凝土框架进行地震分析

摘要 通过引入鱼骨模型结构元件参数估计的新程序，提出了改进的鱼骨（IFB）模型，用于旧式和现代钢筋混凝土框架的抗震分析。该程序可以大致说明结构元素对框架建筑地震响应的重要性以及框架建筑结构元素之间需求的潜在重新分配的影响。首先，描述IFB模型。通过模拟选定的伪动态测试框架的楼层剪切、楼层漂移和楼层加速度的响应历史来展示其能力。最后，表明 IFB 模型可以提供 Pushover 曲线，基于响应历史分析的相应损伤状态和易损性函数与传统多自由度模型获得的非常相似。Pushover 分析也证明了 IFB 模型相对于传统鱼骨模型的能力。可以观察到，IFB 模型显着改进了旧钢筋混凝土框架的模拟，这些框架不满足强柱 - 弱梁概念，并且框架建筑一层的柱或梁与框架建筑的柱或梁明显不同的框架彼此。需要进一步研究来扩展简化结构模型的能力，以规划不规则框架建筑。Pushover 分析也证明了 IFB 模型相对于传统鱼骨模型的能力。可以观察到，IFB 模型显着改进了旧钢筋混凝土框架的模拟，这些框架不满足强柱 - 弱梁概念，并且框架建筑一层的柱或梁与框架建筑的柱或梁明显不同的框架彼此。需要进一步研究来扩展简化结构模型的能力，以规划不规则框架建筑。Pushover 分析也证明了 IFB 模型相对于传统鱼骨模型的能力。可以观察到，IFB 模型显着改进了旧钢筋混凝土框架的模拟，这些框架不满足强柱 - 弱梁概念，并且框架建筑一层的柱或梁与框架建筑的柱或梁明显不同的框架彼此。需要进一步研究来扩展简化结构模型的能力，以规划不规则框架建筑。以及框架建筑一层的柱子或梁彼此显着不同的框架。需要进一步研究来扩展简化结构模型的能力，以规划不规则框架建筑。以及框架建筑一层的柱子或梁彼此显着不同的框架。需要进一步研究以扩展简化结构模型的能力，以规划不规则框架建筑。