Pushout tests for concrete-filled double skin steel tubes after exposure to fire
Pushout tests for concrete-filled double skin steel tubes after exposure to fire
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DOI：
10.1016/j.tws.2022.109274
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发表时间：
2022-07
影响因子：
6.4
通讯作者：
Wei Li;Bing Chen;Lin-Hai Han;J. Packer
中科院分区：
文献类型：
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作者：
Wei Li;Bing Chen;Lin-Hai Han;J. Packer
火灾后钢-混凝土相互作用的性能是钢-混凝土结构火灾后复合作用评估的基础。对受火后的双层钢管混凝土柱进行了拉拔试验，研究了钢管与混凝土之间的粘结滑移性能。主要试验参数包括受火持续时间、截面空心率、钢管径厚比、表面粗糙度和有效长径比。将实测温度结果与数值计算结果进行了比较，并对火灾前后的荷载传递机理进行了探讨。试验结果表明，火灾后钢管与混凝土之间的粘结强度仍能满足现行规范的要求。
The performance of the steel–concrete interaction after fire exposure is essential for the post-fire evaluation of composite action in steel–concrete structures. Pushout tests for the bond–slip behaviour between steel tube and concrete are conducted for concrete-filled double skin steel tubular (CFDST) columns after exposure to fire. The main test parameters include the fire duration, the hollow ratio of the cross section, the diameter to thickness ratio of the steel tube, the surface roughness, and the effective length to diameter ratio. Measured temperature results are compared with the predicted ones from numerical analysis, and the load transfer mechanism before and after fire exposure is also discussed. It is found that the bond between the steel tube and concrete is still available after exposure to fire and, in general, the bond strength after fire exposure can meet the requirement of most current codes of practice.