钢筋混凝土深梁纵筋锚固的试验研究

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》。

Experimental Research of End Anchorage of Longitudinal Barsin Reinforced Concrete Deep Beams

In this paper, unusual features of end anchorage of longitudinal bars in reinforeed Concrete deep beams are discussed According to the test results on 16 anchorage speciments of reinforced concrete deep beams the average bond stress-bond slip relationships of the plain bars and the deformed bars in deep beams are analysed and compared with the pullout bond tests The same and the different characteristics of anchorage in deep beams and in shallow beams are specially discussed. It is indicated in this paper that the transverse compressive stress in anchorage zone is beneficial to the anchoroge when it is less than 0.5fck, and it is not beneficial to the anchorage when it is more than 0.5fck. The formulas for critical anchorage lengthes, the usable anchorage lengthes in design and the detailing of anchorage in deep beams are also given.