王景玄 王文达 周小燕. 基于多尺度建模的钢管混凝土组合框架耐火性能数值模拟[J]. 工程力学, 2012, 29(增刊Ⅱ): 170-175. DOI: 10.6052/j.issn.1000-4750.2012.05.S003
引用本文: 王景玄 王文达 周小燕. 基于多尺度建模的钢管混凝土组合框架耐火性能数值模拟[J]. 工程力学, 2012, 29(增刊Ⅱ): 170-175. DOI: 10.6052/j.issn.1000-4750.2012.05.S003
WANG Jing-xuan. NUMERICAL SIMULATION ON FIRE RESISTANCE OF COMPOSITE FRAME WITH CFST COLUMNS BASED ON MULTI-SCALE METHOD[J]. Engineering Mechanics, 2012, 29(增刊Ⅱ): 170-175. DOI: 10.6052/j.issn.1000-4750.2012.05.S003
Citation: WANG Jing-xuan. NUMERICAL SIMULATION ON FIRE RESISTANCE OF COMPOSITE FRAME WITH CFST COLUMNS BASED ON MULTI-SCALE METHOD[J]. Engineering Mechanics, 2012, 29(增刊Ⅱ): 170-175. DOI: 10.6052/j.issn.1000-4750.2012.05.S003

基于多尺度建模的钢管混凝土组合框架耐火性能数值模拟

NUMERICAL SIMULATION ON FIRE RESISTANCE OF COMPOSITE FRAME WITH CFST COLUMNS BASED ON MULTI-SCALE METHOD

  • 摘要: 钢管混凝土组合框架在局部火灾作用下可能会出现由于受火柱破坏而引发的结构连续性倒塌破坏。在合理选取钢材与混凝土的热-力本构模型的基础上,合理选取了组合框架中梁柱构件单元模型及其相互作用模型,基于ABAQUS软件用多尺度建模方法建立了局部火灾作用下三层三跨钢管混凝土平面组合框架的数值模型,对4种典型火灾工况下结构整体变形、内力分布、破坏机制等进行了分析研究,并在此基础上进行了不同火灾工况下组合框架的耐火极限计算。结果表明:框架中间层受火时,由于周围构件的约束作用明显而使得其耐火极限最大。

     

    Abstract: The composite frames with concrete-filled steel tubular (CFST) columns may damage in a progressive collapse mode because of the failure of the CFST columns under local fire attack. This paper presents a finite element model (FEM) of a three-story-three-span planar composite frame with CFST columns exposured to local fire scenes based on a multi-scale method using ABAQUS. The reasonable thermal and material models of steel and concrete were considered, respectively. The element models and the interactions of the beams and columns were simulated logically in the FEM. The structural deformations, internal force distributions and the failure modes of the composite frame were studied under four different fire scenes and the fire resistance rating of the frame were calculated. The results show that the fire resistance rating is the most maximum when the fire scene located at the middle floor due to the effective constraint by the other members.

     

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