Seismic behavior of steel reinforced concrete cross-shaped columns after exposure to high temperatures
Seismic behavior of steel reinforced concrete cross-shaped columns after exposure to high temperatures
复制标题
高温下钢筋混凝土十字形柱的抗震性能
DOI：
10.1016/j.engstruct.2020.111723
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发表时间：
2021-03
影响因子：
5.5
通讯作者：
Jian Jiang
中科院分区：
文献类型：
--
作者：
Yuzhuo Wang;Tiangui Xu;Ziqing Liu;Guoqiang Li;Jian Jiang
本文对十字形型钢混凝土结构的抗震性能进行了试验研究和理论分析。(SRC)柱暴露于高温后。在600 ℃的恒定最高温度下，对总共四个SRC十字形柱试样加热不同的加热持续时间（0 min、60 min、120 min和180 min），并在循环载荷下进行测试，直到冷却至环境温度后失效。分析了试件的滞回曲线、骨架曲线、延性、刚度退化和耗能能力。试验结果表明，型钢混凝土十字形柱在高温作用下表现为弯曲破坏模式，其高温后的抗震性能主要受埋置型钢的控制。受热时间对型钢混凝土十字形柱高温开裂后的荷载影响很大（最大可达67%），这是由于受热破坏了型钢与混凝土的粘结状态。由于型钢的延性和恢复强度得到改善，高温后具有良好的耗能能力。在600 ℃下加热60 min、120 min、180 min时，塑性分别提高了16%、22%和31%。传热分析考虑了最高温度高达1000摄氏度的广泛范围，使用经过验证的数值模型进行。提出了高温后型钢混凝土十字形柱受剪承载力的计算公式。结果表明，高温后抗剪性能受最高温度影响较大，但对加热时间不敏感。型钢对剪切能力的贡献随着温度的增加而增加，最高温度从200 ℃到900 ℃时，增加38%到68%。对于最大暴露温度分别为200 ° C、400 ° C、600 ° C、800 ° C、1000 ° C的实际设计，可保守使用90%、80%、65%、50%和40%的折减系数。
This paper experimentally and analytically studies the seismic behavior of cross-shaped steel reinforced concrete.(SRC) columns after exposure to high temperatures. A total of four SRC cross-shaped column specimens are.heated at a constant maximum temperature of 600 ◦ C for different heating durations (0 min, 60 min, 120 min.and 180 min), and are tested under cyclic loading until failure after cooling down to ambient temperature. The.hysteresis curve, skeleton curve, ductility, stiffness degradation and energy dissipation capacity of the specimens.are analyzed. The experimental results show that the SRC cross-shaped columns exhibit a flexural failure mode.after exposure to elevated temperatures, and their post-high temperature seismic behavior is governed by the.embedded section steel. The heating duration greatly affects the post-high temperature cracking load of SRC.cross-shaped columns (up to 67%) due to the damaged bonding condition between section steel and concrete.during heating. A good post-high temperature energy dissipation capacity is achieved due to the improved.ductility and recovered strength of section steel. The improvement in ductility reaches about 16%, 22% and 31%.of the initial value for a heating duration of 60 min, 120 min, 180 min at 600 ◦ C, respectively. Heat transfer.analyses considering a wide range of maximum temperatures up to 1000 ◦ C are conducted using validated.numerical models. A formula to calculate the shear capacity of SRC cross-shaped columns after exposure to high.temperatures is proposed. It is found that the post-high temperature shear capacity is greatly affected by.maximum temperatures but is not sensitive to heating duration. The contribution of section steel to shear ca-.pacity increases as temperatures increase, by a range of 38% to 68% for maximum temperatures from 200 ◦ C to.900 ◦ C. A reduction factor of 90%, 80%, 65%, 50% and 40% can be conservatively used for practical design for.maximum exposure temperatures of 200 ◦ C, 400 ◦ C, 600 ◦ C, 800 ◦ C, 1000 ◦ C, respectively.
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DOI：
10.1061/(asce)st.1943-541x.0000951
发表时间：
2014-06
期刊：
Journal of Structural Engineering-asce
影响因子：
--
作者：
C. Chen;Cuikun Wang;Hui Sun
通讯作者：
C. Chen;Cuikun Wang;Hui Sun
DOI：
--
发表时间：
--
期刊：
--
影响因子：
--
作者：
Lin-Hai Han;Kan Zhou;Q. Tan;T. Song
通讯作者：
Lin-Hai Han;Kan Zhou;Q. Tan;T. Song
部分预制钢筋混凝土短柱的循环性能：实验与理论分析
影响因子：
5.5
作者：
Xue, Yicong;Yang, Yong;Yu, Yunlong
通讯作者：
Yu, Yunlong
影响因子：
4.1
作者：
Behnoosh Rassouli;S. Shafaei;Amir Ayazi;F. Farahbod
通讯作者：
Behnoosh Rassouli;S. Shafaei;Amir Ayazi;F. Farahbod
影响因子：
5.5
作者：
B. Young;E. Ellobody
通讯作者：
B. Young;E. Ellobody