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: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=613442
• 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具有抗爆炸性，这变得越来越重要。有必要开发创新且具有成本效益的方法，以确保在爆炸事件期间可接受的性能。 材料科学的最新发展导致了新一代的超高性能纤维增强混凝土（UHP-FRC）。与常规混凝土UHP-FRC相比，相比之下，表现出很高的抗压强度，提高的拉伸强度，裂缝后的电阻和韧性，使UHP-FRC成为设计抗爆炸结构的理想材料。在地面柱中，UHP-FRC可用于提高性能并防止进行性崩溃。此外，UHP-FRC的改进特性可以使细节放松，从而提高可构造性。出色的韧性和碎裂性耐药性也可以使UHP-FRC在设计优化的抗爆炸墙时使用，这些墙壁可用作有效的爆炸保护系统的一部分，以实现至关重要的建筑物。 拟议研究的总体目的是减轻与使用UHP-FRC结构系统建筑结构相关的危害。长期的目的还包括设计和在抗爆炸式结构设计中使用UHP-FRC的详细程序。该计划将重点放在UHP-FRC建筑物柱和墙壁组件的爆炸性上。为了评估柱子的爆炸性能，半尺度标本将使用渥太华大学的最先进的冲击管设施进行模拟爆炸装载。这些柱将受到各种爆炸压力组合，旨在在弹性，产量和最终条件下测试柱子。同样，还将在UHP-FRC壁板上进行冲击管测试。测试变量将包括UHP-FRC材料的特性，弯曲和横向钢加固性能（比和强度）。作为分析计划的一部分，将根据可变应变率测试的小规模标本进行广泛的材料测试以及对UHP-FRC柱和壁炉的动态分析的程序进行评估和验证。 该研究计划将对UHP-FRC组件的爆炸性性能进行创新的实验和分析研究，并为工程和研究社区提供重要的数据和研究结果。六名研究生将接受培训，并在该计划中接受了HQP培训，将满足对加拿大建筑物抗爆炸性设计的工程师的增加。该计划将是为UHP-FRC开发CSA S850 BLAST设计指南的第一步，从而改善了加拿大人的安全性和安全性。