湖南大学学报（自然科学版）
湖南大學學報（自然科學版）
호남대학학보（자연과학판）
Journal of Hunan University (Natural Sciences)
2015年
9期
42-51
,共10页
钢管混凝土%短柱%火灾全过程%剩余承载力%有限元分析%简化计算
鋼管混凝土%短柱%火災全過程%剩餘承載力%有限元分析%簡化計算
강관혼응토%단주%화재전과정%잉여승재력%유한원분석%간화계산
concrete-filled steel tube%stub columns%full range fire%residual strength%finite element analysis%simplified calculation
在提出火灾全过程各阶段中钢管和核心混凝土应力应变关系模型的基础上，采用有限元软件 ABAQUS 中的热应力耦合分析模块计算了 ISO-834标准火灾全过程作用后圆钢管混凝土轴压短柱的荷载变形关系曲线，计算结果和试验结果基本吻合。对火灾全过程中圆钢管混凝土轴压短柱的荷载变形关系、钢管和核心混凝土的截面应力分布以及两者之间的相互作用进行了分析，探讨了升温时间、初始荷载、截面含钢率、钢材强度、混凝土强度、防火保护层厚度和截面尺寸等参数对圆钢管混凝土轴压短柱剩余承载力的影响规律，最终提出了圆钢管混凝土轴压短柱剩余承载力的简化计算公式。
在提齣火災全過程各階段中鋼管和覈心混凝土應力應變關繫模型的基礎上，採用有限元軟件 ABAQUS 中的熱應力耦閤分析模塊計算瞭 ISO-834標準火災全過程作用後圓鋼管混凝土軸壓短柱的荷載變形關繫麯線，計算結果和試驗結果基本吻閤。對火災全過程中圓鋼管混凝土軸壓短柱的荷載變形關繫、鋼管和覈心混凝土的截麵應力分佈以及兩者之間的相互作用進行瞭分析，探討瞭升溫時間、初始荷載、截麵含鋼率、鋼材彊度、混凝土彊度、防火保護層厚度和截麵呎吋等參數對圓鋼管混凝土軸壓短柱剩餘承載力的影響規律，最終提齣瞭圓鋼管混凝土軸壓短柱剩餘承載力的簡化計算公式。
재제출화재전과정각계단중강관화핵심혼응토응력응변관계모형적기출상，채용유한원연건 ABAQUS 중적열응력우합분석모괴계산료 ISO-834표준화재전과정작용후원강관혼응토축압단주적하재변형관계곡선，계산결과화시험결과기본문합。대화재전과정중원강관혼응토축압단주적하재변형관계、강관화핵심혼응토적절면응력분포이급량자지간적상호작용진행료분석，탐토료승온시간、초시하재、절면함강솔、강재강도、혼응토강도、방화보호층후도화절면척촌등삼수대원강관혼응토축압단주잉여승재력적영향규률，최종제출료원강관혼응토축압단주잉여승재력적간화계산공식。
On the basis of the proposed stress-strain relationships of steel and concrete of concrete-filled circular steel tubes (CFCST)at each stage of fire exposure,fully coupled thermal-stress analysis model in finite element soft ABAQUS was developed to predict the load-deformation relationship curves of axially loaded CFCST stub columns after exposure to ISO-834 standard fire.The predicted results were in good agreement with test results.The finite element analysis model was then used to investigate the behavior of CFCST stub columns by examining the load-deformation relationship,the cross-sectional stress distribu-tions of steel tube and concrete core and their interaction during the entire stage of fire exposure.Paramet-ric analysis was conducted to investigate the influence of heating time,initial axial,steel ratio,steel yield strength,concrete cube strength,spray insulation thickness and sectional size on the residual strength of axially loaded CFCST stub columns.Finally,a set of formulas was proposed to predict the residual strength of axially loaded CFCST stub columns after exposure to fire.
