Scholarlink

<p>This study examines the behavior of structural elements under fire, particularly focusing on the thermal and mechanical properties of concrete and steel. A model of a composite joint (steel beam and steel-reinforced concrete (SRC) column) is created using ABAQUS software and validated with experimental data. The analysis compares the post-fire cyclic behavior, including the cooling phase, to the intact state. Results show that the intact joint outperforms the fire-exposed joint cyclically due to changes in material properties. The intact SRC joint supports up to 670 kN, which decreases to 82%, 66%, and 40% after fire exposure at 400, 600, and 800&#xa0;°C, respectively. Improving concrete compressive strength, reducing heat exposure, and substituting CFST for SRC enhance stiffness, ultimate strength, and energy dissipation. Heat application is the most influential factor: reducing the temperature from 800 to 20&#xa0;°C increases stiffness, ultimate strength, and energy dissipation by 34.23%, 50.17%, and 44.47%. The hysteresis curve pinching intensifies with temperature rise from 20 to 800&#xa0;°C due to significant stiffness degradation during reloading and severe damage to the concrete near the steel section, which weakens the joint bond strength.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Post-fire performance of steel beam to CFST/SRC column composite joint under cyclic loading

  • 期刊论文

  • 发表日期：

    2025年6月23日

查看全文
  • Yeganeh Tofangi,
  • Gholamreza Abdollahzadeh,
  • Mahdi Nematzadeh,
  • Amirhossein Azadi

摘要

This study examines the behavior of structural elements under fire, particularly focusing on the thermal and mechanical properties of concrete and steel. A model of a composite joint (steel beam and steel-reinforced concrete (SRC) column) is created using ABAQUS software and validated with experimental data. The analysis compares the post-fire cyclic behavior, including the cooling phase, to the intact state. Results show that the intact joint outperforms the fire-exposed joint cyclically due to changes in material properties. The intact SRC joint supports up to 670 kN, which decreases to 82%, 66%, and 40% after fire exposure at 400, 600, and 800 °C, respectively. Improving concrete compressive strength, reducing heat exposure, and substituting CFST for SRC enhance stiffness, ultimate strength, and energy dissipation. Heat application is the most influential factor: reducing the temperature from 800 to 20 °C increases stiffness, ultimate strength, and energy dissipation by 34.23%, 50.17%, and 44.47%. The hysteresis curve pinching intensifies with temperature rise from 20 to 800 °C due to significant stiffness degradation during reloading and severe damage to the concrete near the steel section, which weakens the joint bond strength.