| 牛海成*,高锦龙,张耀宗,丁亚红.方钢管高强再生混凝土叠合柱轴压性能试验研究[J].实验力学,2022,37(6):921~932 |
| 方钢管高强再生混凝土叠合柱轴压性能试验研究 |
| Experimental study on axial compression behavior of high-strength recycled concrete-filled square steel tube reinforced concrete columns |
| 投稿时间：2021-09-22 修订日期：2021-11-14 |
| DOI：10.7520/1001-4888-21-225 |
| 中文关键词: 钢管混凝土叠合柱 方钢管 高强再生混凝土 特征点荷载 延性 承载力计算 |
| 英文关键词:concrete-filled steel tube composite column square steel tube high-strength recycled concrete characteristic point load ductility bearing capacity calculation |
| 基金项目:国家自然科学基金(U1904188)；河南省自然科学基金(182300410247)；河南理工大学博士基金(B2016-66) |
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| 中文摘要: |
| 为研究方钢管高强再生混凝土叠合柱受压性能，以混凝土种类、方钢管内是否配置拉结筋、箍筋间距和钢管壁厚为变化参数，完成了5根方钢管高强混凝土叠合柱的单调加载试验，并分析了不同变化参数对高强再生混凝土叠合柱受压性能的影响。结果表明：方钢管高强再生混凝土叠合柱损伤发展过程和破坏形态与普通混凝土叠合柱相似；方钢管高强再生混凝土叠合柱承载能力较普通混凝土叠合柱有所提高，但峰值荷载后承载力发生突降变形性能较差；方钢管内配置拉结筋、减小箍筋间距和增大钢管壁厚均提高了方钢管高强再生混凝土叠合柱的受力性能。考虑方钢管对核心再生混凝土以及箍筋对外围钢筋再生混凝土的约束，本文提出了方钢管高强再生混凝土叠合柱的轴压承载力计算公式，结果表明，计算值与实测值吻合较好。 |
| 英文摘要: |
| To study the in axial compression performance of high-strength recycled concrete-filled square steel tube reinforced concrete (CFSSTRC) columns, 5 specimens were designed for experiments under the monotonic static loading. The concrete type, whether tie bars are set or not in the square steel tube, stirrup spacing and steel tube wall thickness were regarded as major variable parameters. The damage development process and failure characteristics were observed. The load-axial displacement curves and load-strain curves were obtained. The influence of varying parameters on the mechanical performance of high-strength recycled CFSSTRC columns was analyzed. The experimental results show that the damage development process and failure modes of recycled concrete composite columns are similar with those of normal concrete composite columns. The bearing capacity of recycled concrete specimens are improved compared with ordinary concrete specimens, while the deformation performance becomes poor, due to the sudden drop of the bearing capacity after the peak load. Setting up tie bars in the square steel tube, reducing the stirrup spacing and increasing the wall thickness of steel tube have a significant impact on mechanical performance of recycled CFSSTRC columns. Considering the restrain of the square steel tube to the internal recycled concrete and stirrup to external reinforced recycled concrete, a bearing capacity calculation formula is proposed of the recycled composite columns, and the calculation results show well agreement with experiment results. |
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