ECC改进钢筋混凝土单柱桥墩抗震性能理论及试验研究

与普通钢筋混凝土和箍筋约束核心混凝土比较而言，ECC具有更好的延性、变形能力、耗能能力、很高的损伤承受能力和抗坍塌能力、耐久性、环保性和可持续性。ECC这些良好的性能使其非常适合于桥梁抗震，而当前将ECC运用于桥梁抗震方面的研究还非常少，ECC桥梁相关的抗震理论研究和试验工作还未展开，ECC桥梁的抗震机理和抗震性能还不明确，ECC适于抗震的特性还没有在桥梁抗震中充分体现和发挥。本项目以结构形式和变形行为均非常单纯的ECC改进钢筋混凝土单柱桥墩作为主要的研究对象，从材料和构件两个层次，从理论和试验两个方面，通过开展ECC改进钢筋混凝土单柱桥墩和普通钢筋混凝土单柱桥墩拟静力试验和振动台试验，探索ECC改进钢筋混凝土单柱桥墩的抗震机理和损伤控制原理，研究ECC改进钢筋混凝土单柱桥墩的动力灾变过程和破坏特征，为ECC这种高性能材料在桥梁抗震中的创新性应用提供理论依据和试验支持。

Compared with the reinforced concrete and the confined one, ECC has better ductility, deformation ablity, energy dissipation ability, damage and collapse resistance capacity, durability, environmental protection and sustainability. The favorable properties of ECC are suitable for the seismic resistance of bridges very much. However, the research is still little about the application of ECC in the seismic resistance of bridges. The theoretical and experimental study has not been conducted on the seismic resistance of ECC bridges and the seismic mechanism and performance is still unclear. The wonderful characteristics of ECC have not been appeared in the seismic resistance of bridges too. The main object of the project is the single-column bridge pier improved by ECC, whose structural form and deformation behavior are very pure. At the material and component levels, the seismic resistant mechanism, the damage control principle, the dynamic catastrophic process and the failure characteristics of the ECC bridge piers are studied from the theoretical and experimental aspects, based on the pseudo-static tests and the shake table tests of the ECC and RC birdge piers. The research will supply theoretical foundation and experimental support for the creative application of ECC in the seismic resistance of bridges.