Utilization of Ultra High Performance Concrete for Offshore Applications.

超高性能混凝土在海上应用中的利用。

• 批准号: RGPIN-2015-04159
• 负责人: Marzouk, Hesham
• 金额: $ 1.46万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=658951
• 关键词: Utilization; Ultra; Performance; Concrete; Offshore

The development of Ultra High Performance Fiber Concrete (UHP-FRC) is deemed as one of the most promising technological advances in material applications suitable for structural Engineering. The new material exhibits exceptional mechanical and durability properties. Concepts of particle packing using nanotechnology have been taken one step further to produce it. The enhanced ductility, impact resistance and energy absorption capacity of the new concrete makes it an ideal material for use in high resistance structures. The present research investigation will be focused on studying the concrete plate under static and impact loading. The use of thin plate can be used as a concrete form for thick mega important structures like offshore and nuclear containment structures or it can be attached to building exterior panels to produce safer more sustainable structural shield in the future.***The new material has been used for different parts on the roof, base slab and other parts of the new offshore Hebron gravity concrete platforms. UHP-FRC has an excellent resistance to spalling, scabbing, and fragmentation, making it an ideal material for wave forces and sea ice for the splash zone. The new material is very well used for offshore wind turbine structures applications.***The cracking, tension stiffening and reinforcement ratios of UHP-FRC plate are important design factors for any offshore structure. The impact loading of UHP-FRC plate under dropped weight will be investigated experimentally, analytically and numerically. Four analytical models will be developed based on the critical impact energy for radial cracking, spalling, tunneling (scabbing) and penetration. The Random Decrement (RD) method will be used determine the dynamic properties of the tested plates before and after testing. The natural frequency, damping ratio, normalized RD and normalized deflection will be determined for the tested plates at different nodes. A critical impact energy expressions will be developed after considering the change of the modulus of elasticity due to Dynamic Impact Factor (DIF) for quasi-static domain, and dynamic domain. ***A numerical investigation is being developed using a concrete damage plasticity constitutive mode suitable for large deformation. A series of laboratory tests has been conducted at Ryerson lab under supervision of the applicant to determine the identification model parameters. The damage plasticity model under strain rate dependent is considered as a modification of the Drucker-Prager strength hypothesis. Tensile and  damage parameters will be used for the model. The developed numerical FE model will be used on the simulation of the impact problem using explicit dynamic analysis technique. The long term objective will be focused on the successful development of an efficient design of a thin plate to be used as a shield against impact for important structures. ***********

超高性能纤维混凝土（UHP-FRC）的开发被认为是适合结构工程的材料应用中最有前途的技术进步之一，这种新材料表现出卓越的机械和耐久性能，采用了纳米技术的颗粒填充概念。新型混凝土的延展性、抗冲击性和能量吸收能力进一步增强，使其成为高阻力结构的理想材料，目前的研究重点是研究静态和冲击载荷下的混凝土板。 .薄板的使用可用作厚大型重要结构（如近海和核安全壳结构）的混凝土模板，也可连接到建筑外部面板，以在未来生产更安全、更可持续的结构屏蔽。***新材料已用于不同的部件新型海上希伯伦重力混凝土平台的屋顶、板底座和其他部分具有出色的抗剥落、结痂和碎裂性能，使其成为新型飞溅区波浪力和海冰的理想材料。材料用得很好适用于海上风力涡轮机结构应用。***UHP-FRC 板的开裂、拉伸刚度和配筋率是任何海上结构的重要设计因素。我们将对 UHP-FRC 板在落重下的冲击载荷进行实验、分析和研究。将根据径向裂纹、剥落、隧道（结痂）和穿透的临界冲击能量开发四种分析模型，并使用随机递减（RD）方法来确定测试板之前和之后的动态特性。测试后，将确定不同节点处的测试板的固有频率、阻尼比、归一化 RD 和归一化偏转。在考虑动态冲击因子 (DIF) 导致的弹性模量变化后，将得出临界冲击能量表达式。 ）用于准静态域和动态域***正在使用适用于大变形的混凝土损伤塑性本构模式进行数值研究。瑞尔森实验室在申请人的监督下确定了应变率相关的损伤塑性模型，该模型被认为是对 Drucker-Prager 强度假设的修改，并将用于该模型。模型将用于使用显式动态分析技术来模拟冲击问题，长期目标将集中于成功开发薄板的有效设计，以用作重要结构的冲击防护罩。 *********