火灾后钢骨-方钢管混凝土短柱的轴压力学性能研究
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摘 要
为满足高层、超高层建筑以及大跨度建筑要求，钢骨-钢管混凝土构件内其具
有承重柱承载力高、施工方便以及抗震耐火性能好等特点而受到广泛关注。同时，
国内外学者都对钢管混凝土柱和钢骨混凝土柱在火灾后以及火灾下构件承受四面
均匀受火的力学性能和承载力损伤程度进行了深入的研究。然而，在实际工程当
中，框架柱与结构墙体或隔墙往往会构成复杂的受力体系，这就造成构件在火灾
下不再只是单纯的四面受火，而是要包括承受其它多种不均匀受火情况，例如：
单面受火、两对面受火、相邻两面受火与三面受火，进一步而言，内置钢骨的钢
管混凝土柱还要考虑受火面是在钢骨的强轴面还是弱轴面。总体而言，不均匀受
火情况总体上造成截面温度场温度整体偏低，减轻了高温环境对材料造成的损伤。
同时，不均匀受火条件下，构件的截面温度不再呈现双轴对称，温度场的不对称
分布会增加初始挠度与附加偏心距。为此，笔者首先将 4根试件放置在加热炉内
进行了温度场试验以及火灾后钢骨-方钢管混凝土短柱的剩余承载力试验，其具体
包括以下四部分。
1）相邻两面受火、三面受火以及、四面受火条件下钢骨-方钢管混凝土短柱
温度场试验
对相邻两面受火、三面受火以及、四面受火条件下钢骨-方钢管混凝土短柱和
四面受火条件下钢管混凝土短柱进行温度场试验，记录试验过程中构件测点的时
间温度关系曲线以及试验现象，并通过对试验数据和试验结果的分析以探究不同
火灾条件下钢骨-方钢管混凝土短柱截面温度场分布特点。
2）钢骨-方钢管混凝土短柱截面温度场分布的有限元模拟及参数分析
合理利用 ANSYS 有限元分析软件，建立钢骨-方钢管混凝土柱在相对两面受火、
三面受火及四面受火条件下的截面温度场分析模型，并用钢骨-钢管混凝土短柱的
温度场试验结果验证计算模型的正确性。同时，利用有限元模型，明确了构件在
不均匀受火下钢骨-钢管混凝土短柱的温度场分布，分析了相对两面受火、三面受
火及四面受火条件下钢骨-方钢管混凝土柱截面的温度场分布规律，并讨论了升温
时间、含钢率、截面边长以及内置钢骨翼缘宽度等参数对钢骨-方钢管混凝土短柱
截面温度场布的影响。
3）受火后的钢骨-方钢管混凝土短柱剩余承载力试验
进行相邻两面、三面以及四面受火后钢骨-方钢管混凝土短柱和四面受火后钢
管混凝土短柱的轴压力学试验，记录了钢骨-钢管混凝土短柱在轴压试验过程中的
应力应变关系曲线和试验现象，通过火灾后钢骨-钢管混凝土柱剩余承载力的试验
结果分析了不同受火条件对钢骨-钢管混凝土短柱剩余承载力的影响。
4）非均匀受火后的钢骨-方钢管混凝土短柱剩余承载力计算模型的建立以及
相关参数分析
基于温度场分析结果，利用有限元软件 Matlab 编制了钢骨-方钢管混凝土短柱
在相邻两面受火、三面受火以及四面受火后的剩余承载力计算模型，并利用试验
结果验证了 Matlab 计算模型的正确性。并分析了钢材种类、受火时间、配骨指标、
混凝土强度等级、套箍指标以及构件截面边长等因素对于构件受火后剩余承载力
的影响，结果表明受火时间、截面边长以及配骨指标都对火灾后构件轴压承载力
的影响较大。
5）火灾后钢骨-方钢管混凝土短柱剩余承载力的简化计算
在综合了国内外对于钢管混凝土火灾后剩余承载力计算方法以及火灾后钢骨-
方钢管混凝土柱短柱试验结果以及参数分析结果，拟合得出了计算钢骨-方钢管混
凝土短柱火灾后的剩余承载力的简化计算公式。
关键词：组合柱；温度场；剩余承载力；火灾后；力学性能
ABSTRACT
Due to the fact that the steel reinforced concrete filled square steel tube (SRCST)
columns owns many outstanding features, such as the high capacity, easy of
construction and fantastic seismic performance, it makes the SRCST columns been
widely used by big-span, and high-rise building, such as Heilongjiang Provincial
Museum. However, most current researches focus on the situation when columns are
under four-side fire, and can’t be adopted to predict the bearing capacity of SRCST
columns under uneven fire.
The uneven fire has lowered the overall temperature and less damage in materials
than those under even fire, and also caused additional lateral temperature deformation,
and also produce the bending moment when SRCST columns is subjected to axial force.
Hence, the author investigates the residual bearing capacity of SRCST columns after
fire, including the following five main parts.
1）Experimental study on the temperature field of SRCST columns under adjacent
two-side, three-side fire and four-side.
The author took an experimental study on the temperature field of SRCST columns
under even and uneven fire, and concrete filled square steel tube column under even fire,
the experiment got temperatures at the representative points.
2）Temperature field distribution of steel SRCST columns and parametric analysis
Based on the thermal properties of material components like steel and concrete.
The writer use the ANSYS to study the typical temperature distribution along the
cross-section of SRCST under even and uneven fire, and the test results of SRCST
columns verify the accuracy of the ANSYS model. This paper analyzes the influence
of the exposure time, the steel ratio, the dimension of cross-sections, and the size of the
reinforced steel on the temperature distribution along the cross-section of SRCST.
3）Experimental study on the bearing capacity of SRCST columns under even and
uneven fire.
The author took an experimental study on the bearing capacity of SRCST columns
under even and uneven fire, and concrete filled square steel tube column under even fire,
the experiment got the deformation-loading curves, the failure mode, and the residual
bearing capacity of SRCST columns.
4）Theoretical and parametric analysis on the bearing capacity of SRCST columns
after fire.
Based on the constitutive model of steel and concrete finite element models were
built by Matlab to investigate the bearing capacity of the residual bearing capacity of
STSRC columns under even and uneven fire, and the test results verify the accuracy of
the Matlab model. Parameteric analysis was carried out to investigate the influence of
the exposure time, the cross-sectional dimension, the type of the steel, and concrete
strength, confinement index, and structure steel index on the fire resistant capacity of
steel reinforced concrete filled square steel tube columns under even and uneven fire.
5）Simplified calculation formula of the ultimate capacity of SRCST columns
under fire.
Based on the tests, which includes temperature distribution tests and experimental
study on the residual bearing capacity of SRCST columns, and finite element models to
get the simplified calculation formula. The study results may work as an inference for
the repairmen of the residual bearing capacity of SRCST columns.
Key words: composite columns; temperature field; resident bearing
capacity; after fire; mechanical property
目 录
摘 要 ...................................................................................................................... 1
ABSTRACT ............................................................................................................. 3
第一章 绪论 ............................................................................................................ 1
1.1 引言 ........................................................................................................... 1
1.1.1 钢骨-方钢管混凝土柱提出 ......................................................... 1
1.1.2 钢骨-方钢管混凝土柱的力学特点 ............................................. 2
1.2 钢骨以及方钢管混凝土的发展概况 ........................................................ 3
1.2.1 钢管混凝土柱的发展与应用 ........................................................ 3
1.2.2 钢骨混凝土柱的发展与应用 ........................................................ 5
1.3 相关课题研究状况 ................................................................................... 6
1.3.1 高温后钢材以及混凝土力学性能研究 ........................................ 6
1.3.2 高温后钢管混凝土力学性能研究 ................................................ 9
1.4 研究意义和研究内容 .............................................................................. 10
1.4.1 研究意义 ........................................................................................11
1.4.2 研究内容 ....................................................................................... 12
第二章 火灾后钢骨-方钢管混凝土短柱的轴压力学试验 ................................ 14
2.1 引言 ......................................................................................................... 14
2.2 温度场试验研究 ...................................................................................... 14
2.2.1 温度场试验基本设施 .................................................................. 14
2.2.2 试验设计和试件制作 .................................................................. 15
2.2.3 试验方法 ...................................................................................... 18
2.3 温度场试验结果以及分析 ..................................................................... 20
2.3.1 试验现象 ...................................................................................... 20
2.3.2 试验炉内实际升温曲线 .............................................................. 20
2.3.3 构件温度场分析 .......................................................................... 22
2.4 轴压力学试验研究 .................................................................................. 25
2.4.1 试件的加工与制作 ...................................................................... 26
2.4.2 轴压力学试验的试验方法 .......................................................... 26
2.5 轴压力学试验的试验结果与分析 .......................................................... 27
2.5.1 试验现象和破坏形态分析 .......................................................... 27
2.5.2 荷载-位移关系曲线分析 ............................................................. 29
2
2.6 本章小结 ................................................................................................. 33
第三章 构件截面温度场和剩余承载力的有限元分析 ...................................... 35
3.1 引言 ......................................................................................................... 35
3.2 温度场有限元模拟 ................................................................................. 36
3.2.1 钢材和混凝土的热工性能 .......................................................... 36
3.2.2 温度场计算的基本原理 .............................................................. 37
3.2.3 温度场计算模型的建立 .............................................................. 38
3.2.4 有限元模拟结果分析 .................................................................. 40
3.3 参数分析 ................................................................................................. 43
3.3.1 受火时间对温度场分布的影响分析 .......................................... 44
3.3.2 方钢管厚度对温度场分布的影响分析 ...................................... 45
3.3.3 截面边长对温度场分布的影响分析 .......................................... 45
3.3.4 内置钢骨翼缘板边长对温度场分布的影响分析 ...................... 46
3.4 受火后钢骨-方钢管混凝土柱极限承载力的计算 ................................ 47
3.4.1 火灾后钢材和混凝土的应力-应变关系 ..................................... 47
3.4.2 剩余承载力计算的基本原理以及计算结果 .............................. 49
3.5 参数分析 ................................................................................................. 51
3.5.1 钢材种类对极限承载力的影响分析 .......................................... 51
3.5.2 混凝土强度对极限承载力的影响分析 ...................................... 52
3.5.3 套箍指标对极限承载力的影响分析 .......................................... 54
3.5.5 受火时间对极限承载力的影响分析 .......................................... 57
3.5.6 截面边长对极限承载力的影响分析 ........................................... 58
3.6 本章小结 ................................................................................................. 61
第四章 火灾后钢骨-方钢管混凝土短柱剩余承载力的简化计算 .................... 63
4.1 引言 ......................................................................................................... 63
4.2 钢管混凝土柱轴压力学的计算方法 ..................................................... 63
4.3 火灾后钢骨-方钢管混凝土柱剩余承载力的计算方法 ........................ 65
4.4 剩余承载力简化计算模型的验证 ......................................................... 66
4.5 本章小结 ................................................................................................. 67
第五章 结论与展望 .............................................................................................. 69
5.1 结论 ......................................................................................................... 69
5.2 展望 ......................................................................................................... 70
参考文献 ................................................................................................................ 72
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作者：侯斌
分类：高等教育资料
价格：15积分
属性：84 页
大小：4.59MB
格式：PDF
时间：2025-01-09
