To analyze and design the reinforced concrete structural members correctly, their behavior must be evaluated under different loadings. The efficiency, accuracy and speed of the methods of structural analysis depend on the use of suitable behavior models. In reinforced concrete structures, the concrete will be cracked under normal loadings since it has a relatively low tensile strength. Therefore, it is important to understand stress transfer mechanisms in the cracked surfaces to evaluate the response of reinforced concrete structures. In the present study, an experimental program is developed to identify the cracked surface behavior under shear loading. The test specimens made of ultra-high performance concrete are used to measure the shear transferred by longitudinal bars (dowel action). Based on the results of the tests and other studies, we present a suitable model for the shear mechanism through the bars in the cracked surfaces of ultra-high performance concrete. The results show that inclined crack decreases the dowel capacity, so that the dowel capacity of samples B6, B7, and B8 decreases to 33%, 50%, and 61% compared to sample B5 (with a 90° angle between notch and bar). The results show the proper accuracy of the equations proposed for estimating the dowel shear-displacement curve in which the correlation was in range 0.972–0.997, between the proposed model and test results.

为了正确地分析和设计钢筋混凝土结构构件，必须评估它们在不同载荷下的性能。结构分析方法的效率，准确性和速度取决于合适的行为模型的使用。在钢筋混凝土结构中，混凝土在正常载荷下会破裂，因为它的抗拉强度相对较低。因此，重要的是要了解裂纹表面的应力传递机制，以评估钢筋混凝土结构的响应。在本研究中，开发了一个实验程序来识别剪切载荷下的裂纹表面行为。用超高性能混凝土制成的试样用于测量纵向钢筋传递的剪切力（销钉作用）。根据测试结果和其他研究，我们提出了一种通过超高性能混凝土开裂表面中的钢筋的剪切机制的合适模型。结果表明，倾斜裂纹会降低定位销的能力，因此与样品B5（缺口和钢筋之间的夹角为90°）相比，样品B6，B7和B8的定位销的容量分别降低至33％，50％和61％。 。结果表明，所提出的模型和试验结果之间的相关性在0.972–0.997范围内，用于估计销钉的剪切位移曲线的方程式具有适当的精度。相较于样品B5（缺口与条形之间的夹角为90°），这一比例为61％。结果表明，所提出的模型和试验结果之间的相关性在0.972–0.997范围内，用于估计销钉的剪切位移曲线的方程式具有适当的精度。相较于样品B5（缺口与条形之间的夹角为90°），这一比例为61％。结果表明，所提出的模型与试验结果之间的相关度在0.972–0.997范围内，用于估计销钉的剪切位移曲线的方程式具有适当的精度。