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| 环向均匀脱空对方钢管混凝土柱轴压受力性能的影响 |
| Effects of the circumferential uniform gap on axial compressive behavior of square concrete-filled steel tubular columns |
| Received:June 07, 2023 Revised:July 23, 2023 |
| DOI：10.7520/1001-4888-23-119 |
| 中文关键词: 方钢管混凝土柱 环向均匀脱空 轴压性能 |
| 英文关键词:square concrete-filled steel tubular column circumferential uniform gap axial compressive behavior |
| 基金项目:国家自然科学基金项目(52278183, 51878303) |
| Author Name | Affiliation | | HU Mengyao | College of Civil Engineering, Huaqiao University, Xiamen 361021, Fujian, China | | JI Yunpeng | College of Civil Engineering, Huaqiao University, Xiamen 361021, Fujian, China | | HU Hongsong* | College of Civil Engineering, Huaqiao University, Xiamen 361021, Fujian, China | | GAO Yichao | College of Civil Engineering, Huaqiao University, Xiamen 361021, Fujian, China |
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| 中文摘要: |
| 为研究环向均匀脱空对方钢管混凝土柱(CFST)轴压性能的影响，以有无环向均匀脱空缺陷、钢管屈服强度和钢管厚度为影响参数，分别对3个环向均匀脱空方钢管混凝土柱和3个无脱空方钢管混凝土柱展开轴压试验。试验观察了试件在轴压状态下的破坏形态，根据试验数据得出各试件的轴压承载力、轴向荷载-应变曲线和内填混凝土的应力-应变曲线，并对各项数据进行分析。结果表明：环向均匀脱空缺陷对方钢管混凝土短柱的初始刚度和破坏形态影响较小，但会显著降低其轴压承载力；增大试件套箍系数对内填混凝土的峰值应力影响不大，但可有效延缓内填混凝土的应力退化速率，并减小环向均匀脱空缺陷对方钢管混凝土柱轴压承载力的负面影响；环向均匀脱空率为0.2%时，环向均匀缺陷会导致内填混凝土的峰值应力降低12%左右。 |
| 英文摘要: |
| In order to reveal the compressive behavior of square concrete-filled steel tubular (CFST) columns with the circumferential uniform gap under axial compression, three square CFST columns with circumferential uniform gap and three normal square CFST columns were tested under axial compression. The failure characteristics of the specimens under axial compression were observed. According to the test data, the axial load capacity, the axial load-strain curve and the stress-strain curve of the infilled concrete are obtained, and the data are analyzed. The test results demonstrate that the effects of circumferential uniform gap defects on the initial stiffness and failure modes of the square CFST columns are neglectable. However, this gap will significantly reduce the axial load capacity. Increasing the confinement index has small influences on the peak stress of the infilled concrete. However, it can effectively delay the stress degradation rate of the filled concrete and reduce the negative influence of the circumferential uniform gap defect on the axial load capacity of the square CFST column. When the circumferential uniform gap ratio is 0.2%, the defect will cause the peak stress of the filled concrete to decrease by about 12%. |
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