本文介绍变形钢筋在混凝土中的粘结锚固机理和粘结锚固强度变化规律以解决混凝士结构中的钢筋锚固设计问题。 锚固条件对变形钢筋-混凝土的粘结锚固性能有很大的影响。本文通过大量拉拔试验探讨了混凝土强度、保护层厚度、配箍、锚固长度以及变形钢筋直径对粘结锚固性能的影响，并通过试验统计回归得出了变形钢筋在混凝士中粘结锚固强度和滑移的计算公式。 为了进一步探讨变形钢筋在混凝士中粘结锚固的机理，量测了不同锈蚀状态钢材表面的粗糙度，确定了钢材与混凝士之间的胶结强度和摩擦系数。观察了锚固钢筋的咬合机理、内裂缝的发展、混凝土的局部破损以及粘结锚固破坏的全过程。在此基础上建立了粘结锚固受力模型井推导了特征粘结锚固强度。所得结果与基于大量拉拔试验统计回归的结果吻合。 根据上述特征粘结锚固强度以及特征滑移，建立了粘结锚固应力一滑移（τ-s）曲线并给出了修正该曲线的位置函数，从而确定了钢筋粘结锚固的了τ-s本构关系。 在上述试验研究的基础上，利用数值迭代方法和递推计算，实现了计算机模拟试验。计算机分析的结果提供了钢筋粘结锚固强度的变化规律及变形钢筋在混凝土中的临界锚固长度和极限锚固长度，并通过可靠度分析提出了钢筋锚固长度的设计建议。

The paper presents the bond-anchorage mechanism of deformed bars in concrete andthe variation regularity of bond-anchoring strength of deformed bars to solve the problemon the anchorage design of concrete structures. The conditions of anchorage intensely aftect bond-anchorage properties or dcformedbars in concrete. The effects of concrete strength thickness of concrete cover, distributionof hoop,anchorage length and diameter of deformed bars for bond-anchoragc propertieshave been investigated on the basis of a lot of pull-out test.By way of experimental statisti-cal regression, the calculating formula of characteristic bond-anchoring strength bas beenestablished For understanding of the bond-anchorage mechanism of deformed bars inconeretc,the roughnesses of different rusted faces of steel arc measured and the adhesivestrcngth,as well as, the friction coefficents between steel and concrete are determined;the in-terlock mechanism, of anchoraged deformed bars , the development of internal crack, thelocal damage in concrete and the whole bond-anchoragc failure process status have alsobeen observed . On the basis of these,the bond-anchorage working models and the variedcharacteristic strength are established and determined. It is in good agreement with statisti-cal regression characteristic bond-anchoring strength based on traditional pull-out test. According to above mentioned characteristic bond-anchoring strength and thecharacter. bond-slip, the paper suggests an anchorage stress-ship(τ-s)curve and a posi-tion function to modify the τ-s curve, hence, the bond-anchorage τ-s constitutiverelationship has been eastablished. Based on above-mentioned results, using interactive method and recursive calculationthe paper developes a computer simulate test . The results of computer analysis provides theregularity of bond-anchoring strength, the critical and ultimate anchoring length of de-formed bars in concrete and the design of anchoring length by reliability analysis hasbeen proposed.