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为提高钢管内混凝土的密实度,减小混凝土的收缩,以保证钢管与混凝土更好地共同工作,满足实际工程需要,该文提出采用钢管自应力自密实高强混凝土柱,考虑偏心距、长径比和初始自应力等参数的影响,设计制作21根钢管自应力自密实高强混凝土柱和3根钢管自密实高强混凝土柱试件,通过偏心受压试验,考察试件的破坏形态,实测试件的荷载-挠度曲线和荷载-应变曲线,分析各参数对偏心受压试件受力性能的影响。研究表明:偏心受压试件主要发生弯曲失稳破坏;试件极限承载力随偏心距或长径比增大而减小,当初始自应力为3 MPa~5 MPa时,钢管自应力自密实混凝土偏心受压柱的极限承载力提高9.2%~11.7%。参考国内相关规范,通过试验数据回归分析,提出钢管自应力自密实高强混凝土柱偏心受压承载力计算公式,可供工程设计参考。
In order to improve the density of concrete in steel pipe and reduce the shrinkage of concrete so as to ensure the steel pipe and concrete work together better and meet the needs of practical engineering, this paper proposes to adopt self-compacting high-strength concrete filled steel tube column, considering eccentricity, Ratio and the initial self-stress and other parameters, design and manufacture of 21 self-compacting high-strength concrete-filled steel tube columns and 3 self-compacting high-strength concrete-filled steel tubular specimens, through the eccentric compression test to examine the destruction of specimens, the test specimen Load-deflection curve and load-strain curve, the influence of each parameter on the mechanical behavior of eccentric compression specimen is analyzed. The results show that bending instability of the specimen under eccentric compression mainly occurs. The ultimate bearing capacity decreases with eccentricity or aspect ratio. When the initial self-stress is from 3 MPa to 5 MPa, the self- The ultimate bearing capacity of eccentrically loaded concrete columns increased by 9.2% ~ 11.7%. Reference to the relevant national norms, through the regression analysis of test data, proposed self-compacting self-compacting high-strength concrete column eccentric compression bearing capacity formula for engineering design reference.