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Experimental investigation of fire-exposed steel tubular stub columns wrapped with CFRP sheets

机译：用CFRP纸包装出火灾钢管柱柱的实验研究

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This paper investigates the effect of high temperature (600 degrees C, 800 degrees C, 1000 degrees C and 1100 degrees C) and the layers of carbon fibre reinforced plastics (CFRP) sheets (one, two, three, four) on the behaviour of fire-exposed steel tubular stub columns. Forty specimens were tested to investigate the failure modes, ultimate bearing capacity under axial compression, load-strain relationship, load-displacement relationship and initial stiffness of the specimens. Ultimate bearing capacity and initial stiffness decrease with the increase of temperature. The ultimate bearing capacity and ductility of fire-exposed specimens wrapped with CFRP sheets increase with the increase of CFRP sheets layers. After being strengthened by CFRP sheets with the same number of winding layers, circular steel tubular (CST) stub columns obtained a greater load-bearing capacity increase than square steel tubular (SST) stub columns. The largest enhancement of the ultimate bearing capacity of fire-exposed specimens is 59.47%. A recommended formula for the calculation of ultimate bearing capacity of fire exposed specimens wrapped with CFRP sheets is proposed.
机译：本文研究了高温（600℃，800℃，1000℃和1100℃）和碳纤维增强塑料层（CFRP）板（一，二，三，四）的影响的影响防火钢管管柱。测试了四十种样本，以研究轴向压缩，载荷 - 应变关系，负载 - 位移关系和标本初始刚度下的最终承载力。随着温度的增加，极限承载力和初始刚度降低。随着CFRP纸张包裹的燃烧样品的最终承载力和延展性随着CFRP薄片层的增加而增加。在具有相同数量的绕组层的CFRP片材加强后，圆形钢管（CST）螺柱柱比方形钢管（SST）短柱增加更大的承载能力。最大限度地增强了灭火标本的最终承载能力为59.47％。提出了一种推荐用于计算用CFRP纸张包裹的灭火标本的最终承载能力的公式。

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