In this study, a fully precast steel—ultrahigh performance concrete (UHPC) lightweight composite bridge (LWCB) was proposed based on Mapu Bridge, aiming at accelerating construction in bridge engineering. Cast-in-place joints are generally the controlling factor of segmental structures. Therefore, an innovative girder-to-girder joint that is suitable for LWCB was developed. A specimen consisting of two prefabricated steel—UHPC composite girder parts and one post-cast joint part was fabricated to determine if the joint can effectively transfer load between girders. The flexural behavior of the specimen under a negative bending moment was explored. Finite element analyses of Mapu Bridge showed that the nominal stress of critical sections could meet the required stress, indicating that the design is reasonable. The fatigue performance of the UHPC deck was assessed based on past research, and results revealed that the fatigue performance could meet the design requirements. Based on the test results, a crack width prediction method for the joint interface, a simplified calculation method for the design moment, and a deflection calculation method for the steel—UHPC composite girder in consideration of the UHPC tensile stiffness effect were presented. Good agreements were achieved between the predicted values and test results.

在这项研究中，基于马普桥，提出了一种全预制的钢-超高性能混凝土（UHPC）轻型复合桥（LWCB），旨在加速桥梁工程中的施工。现浇接头通常是分段结构的控制因素。因此，开发了适用于LWCB的创新的梁到梁连接。制作了一个由两个预制钢-UHPC复合梁部分和一个后浇筑连接部分组成的标本，以确定该连接点是否可以有效地在梁之间传递载荷。探索了在负弯矩下试样的弯曲行为。麻浦大桥的有限元分析表明，关键断面的标称应力可以满足要求的应力，表明设计是合理的。根据以往的研究对UHPC甲板的疲劳性能进行了评估，结果表明该疲劳性能可以满足设计要求。根据试验结果，提出了考虑UHPC抗拉刚度效应的钢-UHPC复合梁的节点界面裂缝宽度预测方法，设计弯矩的简化计算方法以及挠度计算方法。在预测值和测试结果之间达成了良好的协议。提出了考虑UHPC抗拉刚度效应的钢-UHPC复合梁的挠度计算方法。在预测值和测试结果之间达成了良好的协议。提出了考虑UHPC抗拉刚度效应的钢-UHPC复合梁的挠度计算方法。在预测值和测试结果之间达成了良好的协议。