Prestressed segmentally constructed balanced cantilever bridges are often subjected to larger deflections than those predicted by calculations, especially for long-term effects. In this paper, the case of modular balanced cantilever bridges, which are prestressed segmental bridges obtained through a repetition of the same double cantilever, is investigated. The considered bridges are two typical cases of modular balanced cantilever both subjected to large deformations during their lifetime. In this case, due to the unusual employed static scheme, creep deflections indefinitely evolve over time particularly at the end of the cantilevers and in correspondence with the central joint. These remarkable deflections cause discomfort for vehicular traffic and in certain cases can lead to the bridge collapse. Important extraordinary maintenance interventions were necessary to restore the viability of the bridges and to replace the viaduct design configuration. To this aim, the static schemes of the structures were varied, introducing new constraints, new tendons, and carbon fiber reinforcements. In the present work, time analysis was performed to compare the time-dependent behavior of the bridge according to two different creep models, the CEB-FIP Model Code 2010 and the RILEM Model B3, with the real-time-dependent behavior of the bridge observed during its lifetime. The two different employed models exhibit different behaviors in terms of displacements and bending moments acting on the bridge. Interesting considerations are made on their reliability in simulating the long-term creep effects that evolve indefinitely over time. Moreover, retrofitting techniques have been proposed and modeled to predict their effectiveness in reducing time-dependent deflections.

预应力分段构造的平衡悬臂桥的挠度通常比计算得出的挠度大，尤其是对于长期影响。在本文中，研究了模块化平衡悬臂桥的情况，这是通过重复相同的双悬臂获得的预应力分段桥。所考虑的桥梁是模块化平衡悬臂的两种典型情况，它们在使用寿命期间都会发生较大的变形。在这种情况下，由于采用了不寻常的静态方案，蠕变挠度会随时间无限延长，特别是在悬臂末端并与中心节点相对应。这些明显的挠曲使车辆交通不舒服，并且在某些情况下可能导致桥梁倒塌。必须采取重要的特殊维护措施来恢复桥梁的生存能力并替换高架桥设计配置。为了这个目的，改变了结构的静态方案，引入了新的约束，新的腱和碳纤维增强材料。在当前工作中，进行了时间分析，以根据两种不同的蠕变模型（CEB-FIP模型代码2010和RILEM模型B3）将桥梁的时间相关行为与桥梁的实时相关行为进行比较。在其生命周期中观察到。两种不同的模型在作用于桥梁的位移和弯矩方面表现出不同的行为。在模拟随时间无限发展的长期蠕变效应时，需要考虑其可靠性。而且，