适应海洋环境的智能复材增强海砂珊瑚混凝土结构静动力学性能研究

The traditional construction materials are very limited in durability and short service life in the ocean environment, which seriously restrict the further development of the offshore structures. The project proposes the use of sea sand, coral aggregate and high performance of corrosion-resistance of FRP composite material, embedding FBG (fiber Bragg grating) into the FRP rebar, for real-time strain monitoring. To develop a new intelligent composite sea sand-coral concrete, develop an environment-friendly structure system which can be compliable to severe ocean environment. Through a series of experiments, to determine the coral sea sand concrete with different strength grade of material and the proper mixing ratio, to establish the constitutive relation model of FRP reinforced concrete considering the bond slip with coral and sand, to investigate the mechanical properties of sea sand-coral concrete components and mechanical properties evolution and degeneration law under long-term coupling effect caused by loading and severe ocean environment, to conduct the seismic performance tests of FRP reinforced Sea sand-coral concrete columns and joints, and to systematically study its seismic property mechanism..The project makes full use of existing marine resources, develop high-durable and ocean environment-friendly intelligent composite reinforced sea sand-coral concrete structure system, to improve constructing efficiency and sustainability, expend life time and improve durability of the structure, plus, increase its performance against cost, lay the important theoretical foundation for massive and sustainable construction of ocean engineering.

传统建筑材料在海洋环境下耐久性差、结构服役寿命短，严重制约了涉海工程的建设和管养维护。本项目提出将耐腐蚀性能优良的复合材料（FRP）与海砂、珊瑚骨料相结合，并在FRP筋中植入光纤光栅（FBG）以进行应变实时监测，研究一种新的智能复材海砂珊瑚混凝土，形成与海洋环境融为一体的友好型结构体系。通过系列试验确定不同强度等级的海砂珊瑚混凝土材料的合理配合比，建立FRP筋海砂珊瑚混凝土粘结滑移本构关系模型，深入研究FRP筋增强海砂珊瑚混凝土构件的基本力学性能，及在荷载与环境长期耦合作用下的性能退化演化规律。开展FRP筋海砂珊瑚混凝土柱及其节点的抗震动力试验，系统研究其抗震性能机理。本项目通过就地取材、充分利用涉海资源，探索高耐久性的海洋环境友好型智能复材增强海砂珊瑚混凝土结构体系，以提高滨海与海岛工程等建造效率与性价比，延长结构使用寿命，为涉海工程的大规模、可持续建设奠定重要理论基础。

随着我国经济的发展，越来越多的海岸以及岛礁建筑物的修建，导致对砂石和淡水的需求量不断增大，然而海岸以及岛礁上缺乏拌制混凝土的砂石和淡水，使用大型船舶从内陆运输这些材料时，会大幅增加建设成本。本项目提出使用海砂和珊瑚作为骨料、海水作为拌合水并与耐腐蚀性能优良的复合材料（FRP）相结合，形成与海洋环境融为一体的友好型结构体系。通过系列试验确定不同强度等级的海砂珊瑚混凝土材料的合理配合比，建立FRP筋海砂珊瑚混凝土粘结滑移本构关系模型，深入研究FRP筋增强海砂珊瑚混凝土构件的基本力学性能和其抗裂性能的各项影响因素。开展FRP筋海砂珊瑚混凝土构件的抗震性能试验，研究其抗震性能机理。本项目就地取材，充分利用涉海资源，探索高耐久性的海洋环境友好型智能复材增强海砂珊瑚混凝土结构体系，以提高滨海与海岛工程等建造效率与性价比，延长结构使用寿命，为涉海工程的大规模、可持续建设奠定重要理论基础。