带损伤控制保险丝钢梁截面弯矩——转角滞回模型研究

Moment-rotation hysteretic model of steel beam sections with damage-control fuses

摘要

结构地震损伤控制保险丝能够起到保护结构主体构件、减轻地震损伤、提高结构功能可恢复性的作用，为提升结构抗震韧性提供了新思路。为简化带损伤控制保险丝钢梁的数值计算，采用试验研究与理论推导相结合的方法揭示了带该类保险丝钢梁截面的受力机理，提出了一种四折线弯矩－转角骨架曲线，给出了屈服点、最大弯矩点和翼缘接触点等特征点的弯矩和转角理论计算公式，并通过试验数据拟合构建了滞回规则，建立了带保险丝钢梁截面弯矩－转角滞回模型。结果表明：模型计算结果与试验结果吻合较好，骨架曲线特征点的转角和弯矩平均误差分别为12.8%和8.9%，滞回环围合面积平均误差为5.6%，能够准确反映带保险丝构件的弹塑性力学行为。研究结果为该类保险丝在结构性能控制中的应用提供了简化计算模型。

Abstract

The structural seismic damage-control fuses protect the structural components, mitigate seismic damage, and enhance the recoverability of structural functions, providing a new approach to improving the seismic resilience of structures. To simplify the numerical calculation of steel beams with damage-control fuses, a series of experimental research and theoretical derivation were conducted to reveal the stress mechanism of steel beams sections with such fuses. A four-fold line moment-rotation skeleton curve is proposed, and theoretical calculation formulas for the moment and rotation at characteristic points such as the yield point, maximum moment point, and flange contact point are given. A hysteresis rule is constructed through experimental data fitting, and a moment-rotation hysteresis model for steel beams with fuses is established. The research shows that the model calculation results are in good agreement with experimental results, with average error of 12.8% and 8.9% for rotation and moment at characteristic points, respectively, and 5.6% for the area enclosed by hysteresis loop, and can accurately characterize the elastic-plastic mechanical behavior of components with fuses. This study provides a simplified calculation model for the application of damage-control fuses in structural performance control.

关键词

损伤控制保险丝 / 弯矩－转角 / 骨架曲线 / 滞回规则 / 滞回模型

Key words

damage-control fuse / moment-rotation / skeleton curve / hysteretic rule / hysteretic model

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基金资助

城市灾害情景混合模拟推演关键技术研发与示范应用(2024EMST050503)

中国地震局工程力学研究所基本科研业务费专项(2023B02)

大型燃煤机组建(构)筑物的减震隔震方案应用研究()