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本文论述了钢筋混凝土深梁纵筋锚固的特点。根据1.6根深梁锚固试件的试验结果,分析了光园钢筋、变形钢筋在深梁中的粘结应力——滑移曲线并与一般拔出试验结果进行了对比。初步阐明了深梁锚固和一般锚固的异同点。指出当横向压应力小于0.5fck时对锚固是有利的,当横向压应力大于0.5fck时对锚固是不利的。本文还给出了光园钢筋、月牙纹钢筋和螺纹钢筋在深梁中的临界锚固长度公式。最后,提出设计锚固长度和加强锚固措施的建议。本文成果已列入我国新修订的《混凝土结构设计规范》。
This article discusses the characteristics of longitudinal reinforcement of reinforced concrete deep beams. Based on the test results of 1.6 deep beam anchored specimens, the bond stress-slip curve of the light and reinforcement bars in deep beams was analyzed and compared with the results of general pullout test. The similarities and differences between deep beam anchorage and general anchorage are preliminarily clarified. It is pointed out that when the lateral compressive stress is less than 0.5 fck, the anchorage is advantageous, and when the transverse compressive stress is more than 0.5 fck, the anchoring is disadvantageous. In this paper, the critical anchoring length formulas of the light-reinforced steel bars, the crescent-shaped steel bars and the rebars in deep beams are also given. Finally, proposals for designing anchorage lengths and strengthening anchoring measures are proposed. The results of this paper have been listed in our newly revised “Code for Design of Concrete Structures.”