Despite the popularity of precast concrete (PC) composite beams in urban construction, some shortcomings still exist in application. These include easy cracking, poor deformation ability, susceptibility to impact damage. To solve the above problems, engineered cementitious composites (ECC) are applied in the tension zone of PC beam specimens to improve the mechanical properties. Eleven specimens are designed and loaded. An analysis of the bending behavior is presented considering the effects of the precast ECC plate thickness, reinforcement connection mode, and reinforcement ratio on the bending performance. The mechanical characteristics of each stage are analyzed in detail. The crack width development trend is measured. Results show that the bearing capacity and ductility of the PC beams with precast ECC plates and post-pouring zones are higher than those of reinforced concrete (RC) beams; The calculation method given in this paper can reflect the mechanical performance well. The reinforcement stress can be effectively transmitted by a sleeve or hoop connection; the precast ECC plate can effectively control the crack width. The PC beam with ECC baseplate and post pouring area presented in this paper has good mechanical performance and is suitable for engineering construction.

尽管预制混凝土（PC）复合梁在城市建设中很受欢迎，但在应用中仍存在一些不足。这些包括容易开裂，变形能力差，易受冲击破坏的影响。为了解决上述问题，将工程水泥基复合材料（ECC）应用于PC梁试样的拉伸区域，以改善机械性能。设计并加载了11个样本。考虑了预制ECC板厚度，钢筋连接方式和钢筋比例对弯曲性能的影响，对弯曲行为进行了分析。详细分析了每个阶段的机械特性。测量了裂纹宽度的发展趋势。结果表明，预制ECC板和浇筑后区域的PC梁的承载力和延性要高于钢筋混凝土（RC）梁。本文给出的计算方法可以很好地反映机械性能。加强应力可以通过套筒或箍连接有效地传递。预制ECC板可以有效控制裂纹宽度。本文提出的带ECC底板和后浇区的PC梁具有良好的机械性能，适合工程施工。