方钢管螺旋筋复合约束混凝土柱轴压机理及承载力计算
发布时间：2018-08-08 19:26
【摘要】：为研究方钢管螺旋筋复合约束混凝土柱的轴压受力性能,完成了25个方钢管螺旋筋复合约束混凝土柱试件和4个普通方钢管混凝土柱试件的轴心受压试验。从试件的表观破损全过程、核心混凝土的碎裂形态、螺旋筋的失效模式、荷载位移曲线、各钢材组分的应变发展规律等多个角度对方钢管螺旋筋复合约束混凝土柱的轴压机理展开分析,并与普通方钢管混凝土柱进行了对比。研究结果表明:螺旋筋有效改善了方钢管对核心混凝土约束不均匀的特点;螺旋筋、纵筋及方钢管之间具有良好的变形协调性,在本研究的配筋率范围内(0.44%~2.90%),螺旋筋的屈服强度均能充分发挥;方钢管螺旋筋复合约束混凝土柱比普通方钢管混凝土柱具有更好的轴压承载能力和变形能力,且随着螺旋筋间距的减小、直径和径宽比的增大,其表现出更优良的轴压性能;基于复合约束模型推导的承载力公式,其物理意义明确、形式简单,且计算值与试验值吻合较好,可供工程设计参考。
[Abstract]:In order to study the axial compressive behavior of concrete columns confined by spiral steel tubes, the axial compression tests of 25 specimens of concrete columns and 4 specimens of ordinary concrete filled square steel tubes columns were carried out. From the whole process of the apparent damage of the specimen, the fracture form of the core concrete, the failure mode of the spiral reinforcement, the load-displacement curve, The axial compression mechanism of concrete columns confined by spiral steel tubes with different angles, such as the strain development law of each steel component, is analyzed and compared with that of ordinary square steel tube concrete filled columns. The results show that: spiral reinforcement can effectively improve the non-uniform constraint of square steel tube on core concrete, and has good deformation coordination between spiral reinforcement, longitudinal steel bar and square steel pipe. In the range of reinforcement ratio of this study (0.44% 2.90%), the yield strength of spiral steel bars can be brought into full play, and the composite confined concrete columns of square steel tubes have better bearing capacity and deformation capacity than ordinary square steel tubular concrete filled columns. With the decrease of the distance between the spiral bars and the increase of the diameter and the ratio of diameter to width, it shows better axial compression performance, and the bearing capacity formula derived from the composite constraint model has a clear physical meaning and a simple form. The calculated value is in good agreement with the experimental value, which can be used as a reference for engineering design.
【作者单位】： 广西大学土木建筑工程学院;广西大学工程防灾与结构安全教育部重点实验室;
【基金】：国家自然科学基金(51268004,51578163)
【分类号】：TU398.9
本文编号：2172811
[Abstract]:In order to study the axial compressive behavior of concrete columns confined by spiral steel tubes, the axial compression tests of 25 specimens of concrete columns and 4 specimens of ordinary concrete filled square steel tubes columns were carried out. From the whole process of the apparent damage of the specimen, the fracture form of the core concrete, the failure mode of the spiral reinforcement, the load-displacement curve, The axial compression mechanism of concrete columns confined by spiral steel tubes with different angles, such as the strain development law of each steel component, is analyzed and compared with that of ordinary square steel tube concrete filled columns. The results show that: spiral reinforcement can effectively improve the non-uniform constraint of square steel tube on core concrete, and has good deformation coordination between spiral reinforcement, longitudinal steel bar and square steel pipe. In the range of reinforcement ratio of this study (0.44% 2.90%), the yield strength of spiral steel bars can be brought into full play, and the composite confined concrete columns of square steel tubes have better bearing capacity and deformation capacity than ordinary square steel tubular concrete filled columns. With the decrease of the distance between the spiral bars and the increase of the diameter and the ratio of diameter to width, it shows better axial compression performance, and the bearing capacity formula derived from the composite constraint model has a clear physical meaning and a simple form. The calculated value is in good agreement with the experimental value, which can be used as a reference for engineering design.
【作者单位】： 广西大学土木建筑工程学院;广西大学工程防灾与结构安全教育部重点实验室;
【基金】：国家自然科学基金(51268004,51578163)
【分类号】：TU398.9
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