Développement de structures hybrides à haute performance

作为这项建议的一部分，我们瞄准了桥梁主梁和立柱的短期小跨度桥梁市场(桥梁跨度小于或等于10米)，以及多层停车库市场。本项目一期工程包括三个部分：第一部分：混杂高性能预应力梁的设计、制造和试验。第二部分：大型高性能混合柱的设计与试验。第三部分：新型节点梁柱混合高性能节点的设计、制造及结构性能评价。高性能混合结构由纤维增强聚合物(FRP)外筒和在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，以防止混凝土的除冰盐、过多的使用荷载和混凝土开裂，而且还用作结构钢筋，可以承受弯曲和剪切荷载。玻璃钢外管为混凝土提供了约束，以提高其抗压能力并防止其过早开裂。它还大大提高了混凝土的延展性。混合结构的一种新形式是部分填充钢筋混凝土。内FRP管集成在外FRP管内，不仅允许产生空洞，从而减轻梁的自重，而且还起到抗拉加固的作用。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、混凝土和钢筋拉伸钢筋。

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.