ABSTRACT

In this study, four full-scale reinforced concrete columns were built replacing 50% of natural coarse aggregates in concrete mix by recycled aggregates. Three of the columns were exposed to standard ISO-834 fire for 30, 60 or 90 minutes, while the reference specimen was not exposed. Sixty days after fire exposure, the columns were tested under constant axial load and reversed cyclic lateral displacements simulating earthquakes. Test results are evaluated in terms of lateral load capacity, ductility, stiffness and energy dissipation. In addition, an analytical study was conducted to predict the lateral load-displacement response of fire-damaged columns built with recycled aggregates.

摘要

在这项研究中，建造了四根全尺寸钢筋混凝土柱，用再生骨料代替了混凝土混合物中 50% 的天然粗骨料。其中三个柱子暴露在标准 ISO-834 火中 30、60 或 90 分钟，而参考样品没有暴露。火灾暴露 60 天后，柱子在恒定轴向载荷和反向循环横向位移模拟地震下进行了测试。测试结果根据横向承载能力、延展性、刚度和能量耗散进行评估。此外，还进行了一项分析研究，以预测用再生骨料建造的火灾损坏柱的横向载荷-位移响应。