钢管混凝土粘结滑移本构关系理论研究

Theoretical Study on Bond Stress-Slip Relationship of Concrete Filled Steel Tubes

钢管混凝土中钢管与混凝土之间的粘结强度和粘结滑移备受关注。国内外对钢管混凝土粘结滑移的研究较多,但主要侧重于粘结强度的研究,而对粘结滑移本构关系的研究相对较少;而且目前钢材和混凝土的本构关系均已经比较明确,钢管混凝土粘结滑移的本构方程尚无定论。从理论上推导了钢管与混凝土粘结滑移的本构关系,讨论了钢管混凝土粘结滑移本构关系的建立方法。为进一步研究钢管混凝土的粘结滑移本构关系提供了理论依据。

The bond problem between steel tubes and concrete is increasingly concerned by more and more construction engineers and managers. Many experiments have been made at home and abroad, most of which are about bond strength, but the bond stress - slip relationship has got less attention. At present, concrete and steel ＂s constitutive relations are comparatively clear, but the bond stress - slip equation is uncertain. In this paper, the equations of stress of steel tubes, bond stress, and relative slip of steel tubes and concrete are deduced through theoretical analyses, and mathematical model of bond stress - slip relationship is established, which may be contribute to the further analysis of bond - slip relationship of concrete filled steel tubes.