方钢管钢筋混凝土轴压短柱高温后受力性能试验研究

发布时间：2018-06-20 07:04

本文选题：方钢管钢筋混凝土柱 + 高温试验　；参考：《建筑结构学报》2017年04期

【摘要】：通过6根未受火和12根明火试验后的方钢管钢筋混凝土轴压短柱静力试验,研究了升温时间和配筋率对受火后方钢管钢筋混凝土短柱剩余承载力、刚度和延性的影响;对于升温时间30 min和60 min轴压短柱,分别测量了升温过程中关键位置的温度分布情况。试验结果表明:与常温轴压短柱相比,升温30 min且配筋率分别为1.45%及3.26%的轴压短柱,其剩余承载力、轴压刚度和延性分别降低13.4%及5.4%、20.8%及24.3%和31.9%及44.0%;对于升温60 min轴压短柱,其剩余承载力、轴压刚度和延性分别降低23.3%及12.8%、37.5%及39.1%和52.5%及61.5%。在试验基础上,结合GB50936—2014《钢管混凝土结构技术规范》给出了火灾后方钢管钢筋混凝土轴压短柱剩余承载力计算式,其计算结果与试验结果吻合较好。
[Abstract]:The effects of heating time and reinforcement ratio on the residual bearing capacity, stiffness and ductility of reinforced concrete filled steel tubular short columns after fire and 12 open fire tests were studied. The temperature distribution of the key positions in the heating process was measured for 30 min and 60 min axial compression columns respectively. The test results show that the residual bearing capacity, axial compression stiffness and ductility of the short columns with 30 min heating and 1.45% and 3.26% reinforcement ratio are reduced by 13.4% and 5.420%, 24.3% and 31.9% and 44.0%, respectively. The residual bearing capacity, axial compression stiffness and ductility are reduced by 23.3% and 12.8% and 37.5% and 39.1% and 52.5% and 61.5% respectively. On the basis of test, combined with GB50936-2014 "Technical Specification for concrete filled Steel Tube", the formula for calculating the residual bearing capacity of steel tubular reinforced concrete columns under axial compression after fire is given. The calculated results are in good agreement with the experimental results.
【作者单位】：辽宁工程技术大学土木与交通学院;辽宁工程技术大学建筑工程学院;哈尔滨工业大学土木工程学院;
【基金】：国家自然科学基金项目(51208246,51278153)
【分类号】：TU398.9

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