Self-centering concrete joints are an increasingly acceptable mean to sustain earthquake loadings in structures. Whilst seismic performance of self-centering concrete joints is extensively researched, the post-fire seismic performance of self-centering concrete joints is rarely reported. A better understanding of the performance for fire-damaged self-centering concrete joints is necessary to assess the effects of post-earthquake fire on structures incorporating self-centering joints. An experimental study was conducted to investigate the residual capacity of self-centering concrete joints subjected to post-fire earthquake. In total, three self-centering concrete joints were tested to investigate the post-fire seismic performance. One joint was heated to obtain fire damage. One damaged joint was exposed to a post-earthquake fire. Finally, one undamaged joint and two post-fire joints were subjected to cyclic loading. Based on the fire test results, fire responses including thermal response and damages during fire and after fire were investigated. Then, a followed discussion of seismic performance of those post-fire joints was presented. The control joint without heat exhibited excellent seismic performance with negligible residual displacement. Both post-fire joints performed well after exposure to 170 min of ISO-834 standard fire. Undoubtedly, the fire damages and post-earthquake fire damages have a considerable effect on the post-fire seismic performance of self-centering joints. However, the damages induced by cyclic loadings at the drift ratio of 2% before fire test have marginal influence on the seismic performance of post-fire self-centering joint. The experimental data can be subsequently utilized to evaluate the residual capacity of self-centering concrete joints after fires.

中文翻译：

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地震后火灾后受损自复位混凝土节理抗震性能全尺寸试验


自定心混凝土节点是承受结构地震荷载的一种越来越可接受的方法。虽然自定心混凝土节点的抗震性能得到了广泛研究，但自定心混凝土节点的火灾后抗震性能很少被报道。为了评估地震后火灾对包含自定心节点的结构的影响，必须更好地了解火灾损坏的自定心混凝土节点的性能。进行了一项实验研究，以调查自定心混凝土节点在火后地震下的剩余容量。总共测试了三个自定心混凝土节点，以研究火灾后的地震性能。一个接头被加热以获得火灾损坏。一个受损的关节暴露在地震后的火灾中。最后，1 个未受损的节理和 2 个火后节理受到循环载荷。根据防火测试结果，调查了火灾响应，包括热响应和火灾期间和火灾后的损坏。然后，随后讨论了这些火灾后节理的抗震性能。无热的控制节表现出优异的抗震性能，残余位移可以忽略不计。两个火后节理在暴露于 ISO-834 标准火 170 分钟后表现良好。毫无疑问，火灾损害和震后火灾损害对自定心节理的火灾后抗震性能有相当大的影响。然而，火试前2%漂移比的循环载荷引起的损伤对火后自定心节的抗震性能影响不大。 实验数据随后可用于评估火灾后自定心混凝土接缝的剩余承载力。