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首页> 外文期刊>The structural design of tall buildings >Behavior and design of reinforced concrete frames retrofitted with steel bracing against progressive collapse
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Behavior and design of reinforced concrete frames retrofitted with steel bracing against progressive collapse

机译：钢管钢支撑升压钢筋混凝土框架的行为与设计

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摘要

Steel bracing is able to improve progressive collapse resistance of reinforced concrete (RC) frames, but the bracing design is typically based on seismic retrofitting or lateral stability. There is no approach for design of steel bracing against progressive collapse. To this end, a retrofitting approach with steel braces is proposed based on analysis of macro finite element (FE) models with fiber beam elements. The FE models were initially validated through the experimental results of a braced frame and then used to investigate the effects of pertinent parameters on the progressive collapse resistance of planar frames. The results suggest the braces should be placed at the top story. Thereafter, macro FE models are built to investigate the dynamic responses of the three-dimensional prototype RC frames under different column removal scenarios (CRS) and show the necessity of retrofitting. Accordingly, the design approach of steel bracing is proposed with incremental dynamic analysis (IDA) and assuming independent contribution of braces and frames to resistance. Finally, the fragility analysis of the frames under a corner-penultimate-exterior CRS is conducted through IDA and Monte Carlo simulation, and the results confirm the validity of the proposed design approach for retrofitting RC frames.
机译：钢支撑能够提高钢筋混凝土（RC）框架的逐渐塌陷性，但支撑设计通常基于地震改装或横向稳定性。没有钢支撑反对渐进式崩溃的方法。为此，基于对光纤梁元件的宏有限元（FE）型号的分析，提出了一种具有钢支架的改造方法。通过支撑框架的实验结果，最初验证了FE模型，然后用于研究相关参数对平面帧的逐渐塌陷电阻的影响。结果表明括号应放​​在最顶层故事。此后，构建宏FE模型以研究不同列移除场景（CRS）下的三维原型RC帧的动态响应，并显示出改装的必要性。因此，提出了钢支撑的设计方法，具有增量动态分析（IDA），并假设括号和帧对电阻的独立贡献。最后，通过IDA和Monte Carlo仿真进行了角倒数外部CRS下框架的脆弱性分析，结果证实了改装RC帧的提出设计方法的有效性。

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