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Experimental and numerical study on behaviour of square steel tube confined reinforced concrete stub columns after fire exposure

机译：方形钢管承压钢筋混凝土短柱受火后性能的试验与数值研究

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摘要

The behaviour of square steel tube confined reinforced concrete columns after fire exposure was studied experimentally and numerically in this paper. Eighteen stub columns were first heated following the ISO 834 standard fire including both heating and cooling phases, and were subsequently loaded to failure after cooling to ambient temperature. Failure modes, temperatures in specimens, axial load versus deformation curves and strains in steel tube were monitored and discussed. A finite element model was developed using the sequentially coupled thermal-stress analysis method and was validated against tests found in literatures and this study. Parametric study was performed to identify influences of key parameters, where are heating time, cross-sectional dimension, strengths of materials, steel tube to concrete area ratio and reinforcement ratio, on residual capacity and compressive stiffness. Finally, a simplified method is proposed for predicting residual cross-sectional capacity and compressive stiffness of square steel tube confined reinforced concrete columns after fire exposure.
机译：本文通过实验和数值研究了方形钢管承压钢筋混凝土柱受火后的性能。首先按照ISO 834标准火灾（包括加热和冷却阶段）对18个短管柱进行加热，然后在冷却至环境温度后加载至故障。监测和讨论了失效模式，样品温度，轴向载荷与变形曲线以及钢管中的应变。使用顺序耦合热应力分析方法开发了有限元模型，并针对文献和本研究中发现的测试进行了验证。进行了参数研究，以确定关键参数对残余容量和抗压刚度的影响，这些关键参数包括加热时间，横截面尺寸，材料强度，钢管与混凝土的面积比和增强比。最后，提出了一种简化的方法来预测火灾后方钢管约束钢筋混凝土柱的剩余截面承载力和抗压刚度。

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  • 来源
    《Thin-Walled Structures》 |2019年第6期|105-125|共21页
  • 作者

  • 作者单位

    Harbin Inst Technol Minist Educ Key Lab Struct Dynam Behav & Control Harbin 150090 Heilongjiang Peoples R China|Harbin Inst Technol Minist Ind & Informat Technol Key Lab Smart Prevent & Mitigat Civil Engn Disast Harbin 150090 Heilongjiang Peoples R China;

    Delft Univ Technol Fac Civil Engn & Geosci Stevinweg 1 NL-2600 GA Delft Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Square steel tube confined reinforced concrete; Compressive stiffness; Post-fire; Residual capacity; Test; Numerical simulation;

    机译：方钢管密闭钢筋混凝土;抗压刚度;射击后剩余容量;测试;数值模拟;

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