为了研究节段预制波形钢腹板 PC 组合箱梁的力学性能，在考虑施工工艺和配束 比影响的前提下，设计制作了 3 根缩尺模型试验梁进行受力性能试验研究． 对比和分析了 整体浇筑波形钢腹板 PC 组合梁和节段预制波形钢腹板 PC 组合梁力学性能的异同，提出 了节段预制波形钢腹板 PC 组合箱梁抗弯承载力计算公式． 结果表明: 混凝土开裂后，节 段预制梁刚度退化明显大于整浇梁，全体外配束节段预制梁刚度下降最为显著; 节段预制 梁钢腹板抗弯贡献明显大于整浇梁，接缝处截面尤为明显; 相比于整浇梁，节段预制梁体 外应力筋的应力增量较大，且增长速度快; 与整体梁抗弯承载力计算公式相比，提出的节 段预制波形钢腹板 PC 组合箱梁抗弯承载力计算公式的计算值与试验结果吻合更好．

In order to explore the mechanical behavior of segmental precast prestressed composite box girder with corrugated steel webs，under the premise of considering the influence of construction technology and tendon ratios， three scaled model test beams were designed and manufactured for the experiment of mechanical behavior． The similarities and differences were compared and analyzed of the mechanical behavior between the integrally poured prestressed composite box girder with corrugated steel webs and the segmental precast prestressed composite box girder with corrugated steel webs． A calculation formula was presented of flexural bearing capacity of segmental precast prestressed composite box girder with corrugated steel webs． The results show that the stiffness degradation of the segmental precast beam is significantly greater than that of the integral beam after the concrete cracking，especially the segmental beam with only external tendons． The bending contribution of corrugated steel webs of segmental beam is significantly greater than that of the integral beam，particularly evident in the segment joints． The stress increment of external tendon of segmental beam is greater than that of the integral beam with a fast growth speed． Compared with the calculation formula of flexural bearing capacity of integral beam，the calculation formula of flexural bearing capacity of segmental precast beam presented in this paper is better in congruity with the test results