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一些学者对火灾下部分包裹型钢组合柱性能进行了数值研究,但试验研究还比较缺乏,许多方面仍尚待研究。火灾下轴向和转动约束对这类柱性能的影响仍在研究中。介绍了限制热伸长时这类柱的一系列耐火试验结果。为进行耐火试验而专门设计了一种试验装置,使柱的轴向和转动约束与实际情况相近。研究参数为:荷载水平、轴向和转动约束率及柱长细比。结果表明:低荷载水平下,围护结构的刚度对火灾中柱子性能的影响很大。临界时间随围护结构刚度的增大而减小;高荷载水平下则不存在这种情况。
Some scholars have carried out numerical studies on the performance of partially wrapped steel composite columns under fire, but the experimental research is still relatively scarce, and many aspects remain to be studied. The effects of axial and rotational constraints on the performance of such columns under fire are still under investigation. A series of fire test results are presented for such columns to limit thermal elongation. A special test device has been designed for fire resistance testing, which allows the axial and rotational restraint of the column to be similar to the actual situation. The research parameters are: load level, axial and rotational restraint rate and column slenderness ratio. The results show that under the low load level, the rigidity of the envelope influences the performance of the column in fire greatly. The critical time decreases with increasing stiffness of the envelope; this is not the case at high load levels.