裂缝宽度直接影响到结构的耐久性和正常使用功能。为研究预应力钢骨超高强混凝土梁的抗裂性，对13根预应力钢骨超高强混凝土简支梁进行了抗弯性能试验，分析了这种新型组合梁的破坏形态、裂缝开展与分布规律和最大裂缝宽度的变化特性，给出了考虑配筋位置的综合配筋指数与正常使用极限状态时荷载-弯矩的关系；结合我国现行相关规范提出了适用于预应力钢骨超高强混凝土梁的平均裂缝间距和最大裂缝宽度的计算公式，其计算结果与实测结果的总体吻合较好。在考虑钢骨腹板的影响时，取梁受拉侧1/2梁高范围内的腹板等效为纵筋，导致综合配筋指数大于0.19时，计算结果略大于实测值，小于0.19时，计算结果略小于实测值。

The crack width directly affects the durability and normal use of structures. In order to investigate the crack resistance of prestressed steel-reinforced ultra-high strength concrete beams, the flexural behaviors of thirteen specimens were tested. Then, this paper analyzes the failure mode and the development and distribution of cracks as well as the maximum crack width were analyzed, and puts forward the relationship between the integrated reinforcement index considering the reinforcement position and the moment under the serviceability limit state was investigated. Based on the existing relevant norms in China, the calculation formula of the average crack spacing and the maximum crack width are proposed, which are appropriate for prestressed steel reinforced ultra-high strength concrete beams. It is found that the calculation results accord well with the test results. In addition, when the web effect is taken into account, the webs of the tension side in a 1/2 beam height range are considered to be equivalent to the longitudinal reinforcement, which leads to the finding that  the calculation values with an integrated reinforcement index of more than 0.19 are slightly greater than the measured ones while the calculation values with an integrated reinforcement index of less than 0.19 are slightly smaller than the measured ones.