Abstract

Post-earthquake fires (PEF) are a frequent phenomenon of earthquakes and usually causes severe damage to reinforced-concrete (RC) columns. To determine the high-temperature performance of RC columns damaged by PEF, the geometric-damage forms of concrete columns after an earthquake are mainly classified as cracking, concrete spalling, and residual deformation on the basis of existing hazard and experimental data. Full-scale seismic-damage column tests were performed to analyse the failure mode of components at a high temperature. Subsequently, the relative depth of cracks, thickness of concrete spalling, relative height of spalling, and residual deformation were proposed as geometric-damage parameters to calculate the thermal-field distribution. Finally, according to the relation between the geometric-damage parameters and the bearing capacity, equations for predicting the high-temperature bearing capacity of PEF concrete columns were established.

摘要

地震后的火灾（PEF）是地震的常见现象，通常会严重破坏钢筋混凝土（RC）柱。为了确定受PEF破坏的RC柱的高温性能，根据现有的危害和试验数据，地震后混凝土柱的几何损伤形式主要分为开裂，混凝土剥落和残余变形。进行了全面的地震破坏柱测试，以分析高温下组件的失效模式。随后，提出了裂缝的相对深度，混凝土剥落的厚度，剥落的相对高度和残余变形作为几何损伤参数，以计算热场分布。最后，根据几何损伤参数与承载力之间的关系，