Abstract

The post-earthquake fire (PEF) phenomenon occasionally causes more severe damage than the earthquake itself. In order to investigate the fire-resistance performance of concrete columns, the earthquake damage of concrete structure are defined into three types: cracks, spalling, and residual deformation by earthquake disaster data and seismic experiments. Next, earthquake-damaged models of RC columns are established based on these geometric characteristic parameters. Full-scale earthquake damaged column tests are performed to analyse the failure mode of components under high temperatures. The effects of the geometric characteristic parameters and mechanical performance parameters on the fire resistance of earthquake-damaged RC columns are calculated by ABAQUS. Finally, the damage reduction factors of PEF RC columns are used to evaluate the degradation of fire resistance. The quantitative relationships between PEF RC columns and undamaged columns are established based on the reduction factors. These relationships can provide a rapid assessment of the fire resistance and bearing capacity of earthquake-damaged structures.

摘要

地震后火灾 (PEF) 现象有时会造成比地震本身更严重的破坏。为了研究混凝土柱的耐火性能，通过地震灾害数据和地震试验，将混凝土结构的地震破坏分为裂缝、剥落和残余变形三种类型。接下来，基于这些几何特征参数建立RC柱的地震破坏模型。进行了全尺寸地震损坏柱试验，以分析高温下构件的失效模式。利用ABAQUS计算了几何特征参数和力学性能参数对地震破坏RC柱耐火性能的影响。最后，PEF RC柱的减损系数用于评估耐火性能的退化。PEF RC 柱和未损坏柱之间的定量关系是基于折减因子建立的。这些关系可以提供对地震破坏结构的耐火性和承载能力的快速评估。