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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 |
| Effect of Circumferential Uniform Gap on Axial Compressive Behavior of Square Concrete-Filled Steel Tubular Columns |
| 投稿时间：2023-06-07 修订日期：2023-07-23 |
| DOI： |
| 中文关键词: 方钢管混凝土柱；环向均匀脱空；轴压性能 内填混凝土应力-应变曲线 |
| 英文关键词:square concrete-filled steel tube column circumferential uniform gap axial compressive behavior Stress-strain curve of filled concrete |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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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，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。观察了试件在轴压状态下的破坏形态，对比分析了各试件的轴向荷载-应变曲线、轴压承载力和内填混凝土的应力-应变曲线。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 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 test variables included with or without 0.2% Circumferential Uniform gap defect, yield strength and thickness of steel tube. The failure characteristics of the specimens under axial compression were observed, and the axial load-strain curves, the axial load capacity and the stress-strain curves of the concrete infill were compared and analyzed. The test results indicated that the circumferential uniform gap defects have little effect on the initial stiffness and failure modes of the square CFST columns, but it will significantly reduce the axial load capacity; Increasing the confinement index has little effect 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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