Performance of Ultra High Performance Fiber Reinforced Concrete Elements Subjected to Extreme Blast Loads

承受极端爆炸载荷的超高性能纤维增强混凝土构件的性能

• 批准号: RGPIN-2015-05254
• 负责人: Aoude, Hassan
• 金额: $ 1.46万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=677255
• 关键词: Performance; Ultra; Fiber; Reinforced; Concrete

Due to increased threats it is becoming important to ensure that strategic buildings in Canadian cities are blast resistant. There is a need to develop innovative and cost-effective methods that can ensure acceptable performance during blast events.***Recent developments in material science have led to a new generation of Ultra High Performance Fibre Reinforced Concretes (UHP-FRC). When compared to conventional concrete UHP-FRC shows very high compressive strength, improved tensile strength, post-cracking resistance and toughness, making UHP-FRC an ideal material for use in the design of blast resistant structures. In ground-story columns, UHP-FRC can be used to improve performance and prevent progressive collapse. Moreover the improved properties of UHP-FRC can allow for relaxed detailing leading to improved constructability. Superior toughness and fragmentation resistance can also allow for the use of UHP-FRC in the design of optimized blast-resistant walls that can be used as part of an effective blast protection system for buildings of critical importance.***The overarching aim of the proposed research is to mitigate hazards associated with blast loads on building structures using UHP-FRC structural systems. The long-term aims also include the development of design and detailing procedures for the use of UHP-FRC in the blast-resistant design of structures. Short-term the program will focus on the blast performance of UHP-FRC building columns and wall components. To assess blast performance of columns half-scale specimens will be subjected to simulated blast loading using the state-of-art shock-tube facility at the University of Ottawa. The columns will be subjected to a variety of blast pressure combinations aimed at testing the columns at elastic, yield and ultimate conditions. Similarly, shock-tube testing will also be conducted on UHP-FRC wall panels. Test variables will include UHP-FRC material properties, flexural and transverse steel reinforcement properties (ratio and strength) . As part of the analytical program, material models for UHP-FRC which incorporate dynamic effects will be developed based on extensive material testing on small-scale specimens tested under variable strain-rates, and procedures for the dynamic analysis of UHP-FRC columns and walls subjected to blast will be assessed and validated. ***This research program will result in innovative experimental and analytical research on the blast performance of UHP-FRC components and will provide the engineering and research community with important data and research findings. Six graduate students will be training and HQP trained in this program will meet increased demand for engineers that are well-versed in blast resistant design of buildings in Canada. The program will be a first step towards development of CSA S850 blast design guidelines for UHP-FRC, leading to improved safety and security for Canadians. **

由于威胁的增加，确保加拿大城市的战略建筑物具有防爆能力变得越来越重要。有必要制定创新和具有成本效益的方法，以确保在爆炸事件中有可接受的性能。材料科学的最新发展催生了新一代超高性能纤维增强混凝土（UHP-FRC）。与传统混凝土相比，UHP-FRC具有非常高的抗压强度、更高的抗拉强度、抗裂性和韧性，使UHP-FRC成为设计抗爆结构的理想材料。在底层柱中，UHP-FRC可用于改善性能并防止连续倒塌。此外，UHP-FRC的改进性能可以允许放松细节，从而改善可施工性。上级韧性和抗碎裂性也允许在优化的抗爆墙设计中使用UHP-FRC，该墙可用作至关重要的建筑物的有效爆炸保护系统的一部分。*拟议研究的总体目标是减轻与爆炸荷载对使用UHP-FRC结构系统的建筑结构的危害。长期目标还包括在结构抗爆设计中使用UHP-FRC的设计和详细程序的开发。短期内，该项目将重点关注UHP-FRC建筑柱和墙体构件的爆破性能。为了评估柱的爆炸性能，将使用渥太华大学最先进的激波管设备对半尺寸试样进行模拟爆炸加载。柱将承受各种爆炸压力组合，旨在测试弹性、屈服和极限条件下的柱。同样，也将对UHP-FRC墙板进行激波管试验。试验变量将包括UHP-FRC材料特性、弯曲和横向钢筋特性（比例和强度）。作为分析程序的一部分，将根据在可变应变率下测试的小规模样本的广泛材料测试，开发包含动态效应的UHP-FRC材料模型，并评估和验证受爆炸影响的UHP-FRC柱和墙的动态分析程序。* 该研究计划将对UHP-FRC构件的爆炸性能进行创新的实验和分析研究，并将为工程和研究界提供重要的数据和研究成果。六名研究生将接受培训，HQP将满足加拿大对精通建筑物防爆设计的工程师日益增长的需求。该计划将是为UHP-FRC制定CSA S850爆破设计指南的第一步，从而改善加拿大人的安全和安保。**