【摘要】：為研究方鋼管螺旋筋復合約束混凝土柱的軸壓受力性能,完成了25個方鋼管螺旋筋復合約束混凝土柱試件和4個普通方鋼管混凝土柱試件的軸心受壓試驗。從試件的表觀破損全過程、核心混凝土的碎裂形態(tài)、螺旋筋的失效模式、荷載位移曲線、各鋼材組分的應變發(fā)展規(guī)律等多個角度對方鋼管螺旋筋復合約束混凝土柱的軸壓機理展開分析,并與普通方鋼管混凝土柱進行了對比。研究結果表明:螺旋筋有效改善了方鋼管對核心混凝土約束不均勻的特點;螺旋筋、縱筋及方鋼管之間具有良好的變形協(xié)調性,在本研究的配筋率范圍內(0.44%~2.90%),螺旋筋的屈服強度均能充分發(fā)揮;方鋼管螺旋筋復合約束混凝土柱比普通方鋼管混凝土柱具有更好的軸壓承載能力和變形能力,且隨著螺旋筋間距的減小、直徑和徑寬比的增大,其表現(xiàn)出更優(yōu)良的軸壓性能;基于復合約束模型推導的承載力公式,其物理意義明確、形式簡單,且計算值與試驗值吻合較好,可供工程設計參考。
[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.
【作者單位】： 廣西大學土木建筑工程學院;廣西大學工程防災與結構安全教育部重點實驗室;
【基金】：國家自然科學基金(51268004,51578163)
【分類號】：TU398.9

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