Bond behavior of steel fibers reinforced self-stressing and self-compacting concrete filled steel tube columns
Bond behavior of steel fibers reinforced self-stressing and self-compacting concrete filled steel tube columns
复制标题
钢纤维自应力自密实钢管混凝土柱粘结性能
DOI：
10.1016/j.conbuildmat.2017.10.085
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发表时间：
2018-01-15
影响因子：
7.4
通讯作者：
Li, Na
中科院分区：
文献类型：
--
作者：
Lu, Yiyan;Liu, Zhenzhen;Li, Na
本文研究了钢纤维增强自应力自密实钢管混凝土柱的粘结性能。对90根钢管混凝土柱进行了一系列推挤试验。试验中考虑的变量有：(a)混凝土类型（自密实混凝土和钢纤维增强自应力自密实混凝土）；(b)钢管厚度（2.5-4.25 mm）；(c)混凝土强度（C40、C50、C60）；(d)钢纤维体积百分比（0%、0.6%、1.2%）。试验结果表明，FSSCFST试件的粘结强度在0.50 ~ 2.51 MPa之间，总体高于自密实CFST试件。自应力显著提高了CFST试件的粘结强度，平均提高幅度为42.7%。随着钢纤维体积百分比的增加，粘结强度先减小后增大。最后，提出了FSSCFST柱粘结强度的预测公式，与现有设计规范相比，该公式的预测精度更高。(C) 2017 Elsevier Ltd.版权所有。
This paper investigates the bond behavior of steel fibers reinforced self-stressing and self-compacting concrete filled steel tube (FSSCFST) columns. A series of push-out tests on ninety CFST columns are conducted. The variables considered in the test are: (a) concrete type (self-compacting concrete and steel fibers reinforced self-stressing self-compacting concrete); (b) the thickness of steel tube (2.5-4.25 mm); (c) concrete strength (C40, C50 and C60); and (d) steel fibers volume percentage (0%, 0.6% and 1.2%). Experimental results show that the bond strength of FSSCFST specimens varies from 0.50 MPa to 2.51 MPa, which is generally higher than the self-compacting CFST specimens. Self-stress significantly improves the bond strength of CFST specimens, and the average improvement level is 42.7%. The bond strength firstly decreases and then increases with the increase of steel fiber volume percentage. Finally, formulas are proposed to predict the bond strength of FSSCFST columns, and the proposed formulas give a more accurate prediction than the existing design codes. (C) 2017 Elsevier Ltd. All rights reserved.