| 引用本文: | 赵卫平,雷永旺,王振兴,朱彬荣.钢管混凝土中内配钢骨与混凝土黏结性能试验[J].哈尔滨工业大学学报,2020,52(8):121.DOI:10.11918/202002049 |
| ZHAO Weiping,LEI Yongwang,WANG Zhenxing,ZHU Binrong.Experimental study on bond performance between internal steel and concrete in concrete filled steel tube[J].Journal of Harbin Institute of Technology,2020,52(8):121.DOI:10.11918/202002049 |
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| 摘要: |
| 为研究钢管混凝土中内配钢骨与混凝土黏结性能,共进行了18个钢管混凝土试件的推出试验.研究了两种内配钢骨与混凝土界面黏结机理和黏结应力分布规律,采用正交试验分析获得了各因素对黏结强度的影响规律,并基于实测数据提出了黏结强度经验计算式.试验结果表明:内配工字型钢和内配钢管的黏结应力-滑移曲线均包括3个阶段,即胶结段、非线性初滑移段和滑移段；影响工字型钢极限黏结强度的因素主次关系为工字型钢截面尺寸、黏结长度、混凝土强度,其极限黏结强度随工字型钢截面尺寸和混凝土强度增大而增大,而随黏结长度增加而减小；影响内配钢管极限黏结强度的因素主次关系为内配钢管截面尺寸、膨胀剂掺量、黏结长度,其极限黏结强度随内配钢管截面尺寸和膨胀剂掺量增大而增大,随黏结长度增大呈减小趋势；峰值荷载下两种钢骨的黏结应力分布曲线均呈负指数分布,其中工字型钢翼缘外侧平均黏结应力约为腹板的1.77倍；钢管混凝土中内配钢管与混凝土黏结性能优于内配工字型钢；与其他学者成果的对比证明本文黏结强度计算式具有较好适用性. |
| 关键词: 钢管混凝土 黏结-滑移 黏结强度 内配工字型钢 内配钢管 |
| DOI：10.11918/202002049 |
| 分类号:TU398+.9 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51474218) |
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| Experimental study on bond performance between internal steel and concrete in concrete filled steel tube |
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ZHAO Weiping1,LEI Yongwang1,WANG Zhenxing1,ZHU Binrong2
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(1.School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 2.China Electric Power Research Institute, Beijing 100192, China)
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| Abstract: |
| To study the bond performance between internal steel and concrete in concrete filled steel tube (CFST), 18 CFST push-out tests were conducted. The bond mechanism and bond stress distribution law between two kinds of internal steel and concrete were studied. The influencing law of parameters on bond strength was obtained and analyzed through orthogonal test, and empirical formulas of bond strength were proposed based on measured data. Test results show that bond stress-slip curves of both internal I-shaped steel and internal steel tube consisted of 3 stages, namely, adhesive stage, non-liner initial sliding stage, and sliding stage. For internal I-shaped steel, the parameters that influenced ultimate bond strength were in order of section size of internal I-shaped steel, bond length, and concrete strength in terms of importance. The ultimate bond strength of the internal I-shaped steel increased with increasing section size of I-shaped steel and concrete strength, while decreased with increasing bond length. For internal steel tube, the parameters that influenced ultimate bond strength were in order of section size of internal steel tube, mixing amount of expansion agent, and bond length in terms of importance. The ultimate bond strength of the internal steel tube increased with increasing section size of internal steel tube and mixing amount of expansion agent, but decreased with increasing bond length. Bond stress distributions of both internal I-shaped steel and internal steel tube exhibited negative exponential relations under peak load, and the average bond stress on external flange of I-shaped steel was about 1.77 times that of web. The bond performance between internal steel tube and concrete in CFST was better than that of internal I-shaped steel. A comparison with previous research results verified the better applicability of the proposed formulas. |
| Key words: concrete filled steel tube (CFST) bond-slip bond strength internal I-shaped steel internal steel tube |
