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Effect of elevated temperatures on the compressive behavior of timber filled steel and pultruded GFRP tubes

机译：升高温度对木材填充钢和拉挤GFRP管压缩行为的影响

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摘要

This study examines the use of timber as a filler material for steel and pultruded GFRP tube elements and the performance of these sections is compared to solid timber columns, hollow steel and hollow pultruded GFRP tube element after exposure to elevated temperature. In total, 102 specimens were fabricated and exposure to elevated temperature ranging from 20 to 700 degrees C was evaluated. It was found out that filled tubes using timber could improve the compressive strength and stiffness of tubular section specimens up to 73 and 212 percent, respectively. Timber filled steel tube (TFST) and hollow steel tube specimens had a better performance at elevated temperature in comparison to other specimens such that they were able to maintain 28 and 44 percent of their compressive strength and axial stiffness at 700 degrees C. In contrast, timber filled pultruded GFRP tube (TFGT) and hollow pultruded GFRP tube lost more than 25 and 93 percent of their strength and initial stiffness at temperature beyond the glass transition temperature of the resin, 95 degrees C, and resin decomposition temperature, 288 degrees C, respectively. Two novel empirical models were developed which accurately predicted the compressive strength and axial stiffness of TFST and TFGT specimens at room and elevated temperature.
机译：本研究检查了木材作为钢的填充材料和覆盖的GFRP管元件的用途，并且将这些部分的性能与固体木柱，中空钢和中空覆布拉德GFRP管元件进行比较，在暴露于升高的温度后。总共制备了102种试样，并评估了20至700℃的升高温度。发现使用木材的填充管可以分别提高管状截面标本的抗压强度和刚度，分别高达73和212％。与其他标本相比，木材填充钢管（TFST）和中空钢管标本在升高的温度下具有更好的性能，使得它们能够在700摄氏度下保持28和44％的抗压强度和轴向刚度。相比之下，木材填充的草图GFRP管（TFGT）和中空拉挤GFRP管的温度超过25％和93％，在温度下的温度和初始刚度超出玻璃化转变温度的树脂，95℃和树脂分解温度，288℃，分别。开发了两种新的经验模型，该模型精确地预测了TFST和TFGT样品的抗压强度和轴向刚度，并升高了温度。

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