Axial Compression Performance of Post-Fire Concrete Columns Strengthened Using Thin-Walled Steel Tubes
Axial Compression Performance of Post-Fire Concrete Columns Strengthened Using Thin-Walled Steel Tubes
复制标题
薄壁钢管加固火后混凝土柱轴压性能
DOI：
10.3390/su11184971
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发表时间：
2019-09
期刊：
影响因子：
3.9
通讯作者：
Peng Xingqian
中科院分区：
文献类型：
--
作者：
Luo Yi;Su Jiapeng;Xu Yuye;Ou Tingru;Peng Xingqian
针对火灾后混凝土柱的破坏，提出了薄壁钢管加固技术。为研究火灾后薄壁钢管加固混凝土柱的轴压承载力，考虑钢管厚度、加固方式和截面形状等因素，制作了12个试件，其中2个为对照柱，10个按照ISO834温度曲线进行火灾试验。随后，对8个试件进行了加固。进行轴向压缩试验，以更好地了解加固技术。实验表明：（1）对于不同的截面形状，观察到不同的破坏模式：方形截面的局部屈曲，圆形截面的剪切破坏。(2)加固后的柱的刚度、轴压强度和极限变形能力都有可能得到恢复，甚至优于未损伤的柱。(3)对两种增强方法进行了比较。钢管起到约束作用，仅承受张力，并为核心混凝土提供强有力的约束。钢管与混凝土柱共同承担荷载，主要受压，并可能在纵向应变作用下发生屈曲。最后，根据钢管混凝土的受力机理，提出了火灾后薄壁钢管混凝土（包括方截面和圆截面）的轴压计算公式。
For concrete columns damaged by fire, a strengthen technique using thin-walled steel tubes is proposed. To investigate the axial compression capacity of post-fire concrete columns strengthened using thin-walled steel tubes, considering tube thickness, the strengthening method, and section geometry, 12 specimens were fabricated, of which two were control columns and 10 were exposed to fire in accordance with the ISO834 temperature curve. Subsequently, eight specimens were strengthened. Axial compression tests were conducted to provide a better understanding of the strengthening technique. The experiments indicated that: (1) Different failure modes were observed for different cross section geometry—local bucking for square sections, and shear failure for circular sections. (2) The stiffness, axial strength, and ultimate deformation capacity of the enhanced columns may be rehabilitated and even better than the undamaged ones. (3) Two enhancement methods were compared. The steel tubes act as restraints, are merely subjected to tension, and provide strong restraint to the core concrete. The tube carrying load together with the concrete columns are mainly subject to compression, and likely to buckle with longitudinal strain. Finally, axial compressive equations of post-fire reinforced concrete (RC) with thin-wall steel tubes, including both square sections and circle sections, were proposed on the mechanism of concrete filled steel tubes.
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DOI：
10.1061/(asce)0733-9445(1988)114:8(1804
发表时间：
1988-08-01
期刊：
JOURNAL OF STRUCTURAL ENGINEERING-ASCE
影响因子：
--
作者：
MANDER, JB;PRIESTLEY, MJN;PARK, R
通讯作者：
PARK, R
影响因子：
1.8
作者：
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M. Priestley;F. Seible;Yan Xiao;R. Verma
影响因子：
1.8
作者：
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M. Priestley;F. Seible;Yan Xiao;Anuradha Verma
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DOI：
10.1680/jstbu.17.00103
发表时间：
2019-06
影响因子：
1.6
作者：
Haytham F. Isleem;Daiyu Wang;Zhenyu Wang
通讯作者：
Zhenyu Wang
DOI：
10.1061/(asce)0733-9445(2003)129:6(725
发表时间：
2003-06
期刊：
Journal of Structural Engineering-asce
影响因子：
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作者：
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通讯作者：
Yan Xiao;H. Wu