Ultra-High Strength Concrete Filled Composite Columns for Multi-Storey Building Construction
Ultra-High Strength Concrete Filled Composite Columns for Multi-Storey Building Construction
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DOI：
10.1260/1369-4332.15.9.1487
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发表时间：
2012-09-01
影响因子：
2.6
通讯作者：
Xiong, D. X.
中科院分区：
文献类型：
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作者：
Liew, J. Y. Richard;Xiong, D. X.
进行了27个轴心受压柱试件的试验研究，包括18个抗压强度接近200 MPa的超高强度混凝土（UHSC）钢管、4个普通强度混凝土（NSC）钢管和5个空心钢管。将钢纤维添加到UHSC中，以研究它们在提高延性和强度方面的效果。本文还研究了双钢管混凝土柱在多高层建筑中的应用前景。试验结果表明，超高强混凝土钢管混凝土柱具有超高承载力，但达到最大承载力后会发生脆性破坏。此外，仅在核心混凝土上施加荷载、在核心混凝土中加入钢纤维或提高配筋率均能提高超高强混凝土组合柱的延性和强度。试验结果与欧洲规范4的预测结果的比较表明，欧洲规范4的方法可以安全地扩展到预测超高强混凝土填充复合短柱的抗压强度。平均而言，欧洲规范4方法低估了14.6%的阻力，如果不考虑约束效应，3.5%，如果考虑约束效应的所有标本涉及超高强混凝土。然而，为了确保足够的延展性，建议使用0.30或1%钢纤维的最小钢贡献率。此外，在估算三级型钢混凝土组合柱的极限承载力时，应忽略约束效应引起的强度提高。
A test programme was carried out to investigate the performance of 27 axially loaded column specimens, including 18 steel tubes infilled with ultra-high strength concrete (UHSC) of compressive strength close to 200 MPa, 4 steel tubes infilled with normal strength concrete (NSC) and 5 hollow steel tubes. Steel fibres were added into the UHSC to study their effect in enhancing the ductility and strength. Concrete filled double-tube columns were also investigated for potential application in multi-storey and high-rise constructions. Test results showed that UHSC filled tubular columns achieved ultra-high load-carrying capacities, but they could become brittle after the maximum load was attained. In addition, the ductility and strength of composite columns infilled with UHSC was improved by applying load only on the concrete core, adding steel fibres into the concrete core or increasing the steel contribution ratio. Comparison of test results with Eurocode 4's predictions indicates that the Eurocode 4 method could be safely extended to predict the compressive resistance of UHSC filled composite stub columns. On average, Eurocode 4 approach underestimated the resistance by 14.6% if the confinement effect was not considered and by 3.5% if the confinement effect was considered for all the specimens involving UHSC. However, to ensure sufficient ductility, it is recommended that a minimum steel contribution ratio of 0.30 or 1% steel fibres should be used. Furthermore, strength enhancement due to confinement effect should be ignored in estimating the ultimate strength of concrete filled composite columns with Class 3 steel sections.