Dapped-end beams (DEBs), also known as thinned end beams, are often experienced in shear damages under the effect of vertical loads. Especially if the necessary precautions for thinned ends of reinforced concrete prefabricated purlins on the roofs having standard cross sections are not considered during the design, these purlins can be failed suddenly under the accumulated snow loads. This situation causes the roof to collapse completely. In order to mitigate this drawback, it is aimed to improve shear capacity of the purlins by using steel fiber reinforced concrete (SFRC) without changing the cross section geometry and reinforcement. Pursuant to this goal, experimental and numerical studies have been undertaken. The presence of steel fiber and the aspect ratio are selected as main parameters. The use of SFRC increased energy dissipation and shear capacities approximately 2.58 and 1.53 times, respectively. Moreover, the numerical analyses were performed in order to determine the optimum length of SFRC used in concrete from beam ends and fiber volume ratio to be used, and to investigate the effects of shear span to depth ratio (a/d). The results revealed that fiber volume ratio of 2% and the length of SFRC used up to the point where dapped-end region ends are recommended. Moreover, increasing the ratio of a/d results in a decrease in load carrying capacity.

端梁（DEB），也称为薄端梁，通常在垂直载荷的作用下承受剪切损伤。特别是如果在设计过程中未考虑对具有标准横截面的屋顶上的钢筋混凝土预制pur条变细的端部采取必要的预防措施，则这些pur条在积雪荷载下会突然失效。这种情况导致屋顶完全坍塌。为了减轻该缺点，目的是通过使用钢纤维增强混凝土（SFRC）来改善the条的剪切能力，而不改变横截面的几何形状和增强。为了这个目标，已经进行了实验和数值研究。选择钢纤维的存在和纵横比作为主要参数。SFRC的使用分别增加了约2.58倍和1.53倍的能量耗散和剪切能力。此外，进行了数值分析，以便根据梁端和所用纤维体积比确定混凝土中SFRC的最佳长度，并研究剪切跨度与深度之比（a / d）的影响。结果表明，纤维体积比为2％，SFRC的长度一直使用到推荐的末端区域的末端。而且，增加a / d的比率导致负载能力降低。并研究剪切跨度与深度之比（a / d）的影响。结果表明，纤维体积比为2％，SFRC的长度一直使用到推荐的末端区域的末端。而且，增加a / d的比率导致负载能力降低。并研究剪切跨度与深度之比（a / d）的影响。结果表明，纤维体积比为2％，SFRC的长度一直使用到推荐的末端区域的末端。而且，增加a / d的比率导致负载能力降低。