Développement de structures hybrides à haute performance

作为该方案的一部分，我们的目标是短期内，桥梁主梁和支柱的小跨度桥梁市场（桥梁跨度小于或等于10米），以及多层停车场市场。该项目包括三个部分：第一部分：混合高性能预应力梁的设计、制造和测试。第2部分：大型高性能混合柱的设计和测试。第3部分：新型连接梁/柱混合高性能结构性能的设计、制造和评价。高性能混合结构是由纤维增强聚合物（FRP）的外管和FRP管内浇筑的钢筋混凝土组成。后者不仅用作混凝土的永久模板，防止除冰盐、过量服务载荷和混凝土开裂，而且还用作结构钢筋，可以承受弯曲和剪切载荷。FRP外筒对混凝土起到约束作用，增加混凝土抗压能力，防止混凝土过早开裂。它还大大增加了混凝土的延展性。混合结构的一个新版本是部分填充钢筋混凝土。内部FRP管集成在外部FRP管中，不仅允许产生空隙，从而减少梁的自重，而且还可以作为抗拉加固。这种混合结构的新技术提供了增强的设计灵活性，基于四个组件的物理和机械性能的最佳贡献：外管，内管，混凝土和钢筋拉伸。

As part of this proposal, we aim in the short-term, small-span bridges market (bridge-span lower or equal to 10 m) for the main beams and pillars of bridges, as well as the market for multi story parking garages. This INNOV-Phase 1 project includes three parts: Part 1: Design, manufacture and testing of hybrid high performance prestressed beams. Part 2: Design and testing of large-scale high-performance hybrid columns. Part 3: Design, fabrication and evaluation of the structural performance of new connections beams / columns hybrid high performance. High performance hybrid structures are composed of an outer tube in fiber reinforced polymers (FRP) and reinforced concrete poured inside the FRP tube. The latter is used not only as permanent formwork for concrete protection against deicing salt, excess service-loads and cracking of concrete, but also as a structural reinforcement that can carry flexural and shear loads. The FRP outer tube provides a confinement of concrete to increase its compression resistance and prevent its premature cracking. It also greatly increases the ductility of concrete. A new version of the hybrid structures is the partially filled with reinforced concrete. An inner FRP tube is integrated inside the outer FRP tube to allow not only the creation of void and thus reducing the self-weight of the beam, but also it acts as a tensile reinforcement. This new technology of hybrid structures offers enhanced design flexibility based on the best contributions of physical and mechanical properties of each of the four components: outer tube, inner tube, concrete and steel tensile reinforcement.