Behaviour and retrofit of heavy timber structural systems against blast loading

重型木结构系统抗爆炸荷载的性能和改造

• 批准号: RGPIN-2018-04429
• 负责人: Doudak, Ghasan
• 金额: $ 3.13万
• 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=688594
• 关键词: Behaviour; retrofit; heavy; timber; structural

Wood is inherently light weight, flexible and brittle, which means that timber buildings are not expected to resist blast loading in a manner that adequately protects occupants against accidental and intentional explosions. In particular, protecting human lives requires prevention of progressive collapse and minimization of debris throw'. Studies by the applicant and collaborators using a unique Shock Tube Facility at the University of Ottawa has already influenced blast related design code requirements in Canada. However much more needs to be done.*******The overarching objective of proposed research is mitigation of hazards associated with blast loads on timber buildings. This will be achieved by establishing risk evaluation strategies and developing technically and economically viable innovative retrofit methods for new and existing buildings. The research program will generate completely new information and be the basis of HQP research training. The main focus of the experimental component of the research program will be on establishing the behaviour of heavy timber elements and devising retrofit options for existing buildings that may be vulnerable to blast events. This includes examining the effects of fibre reinforced polymers to provide confinement to the wood elements and the use of post-tensioning techniques using steel guy cable and carbon FRP bars. The analytical component will include development of nonlinear material compliance models. Once developed and verified, those models will be used for dynamic analysis and parametric studies of building structures and substructures.*******The proposed research program has a great potential to significantly impact the knowledge base in the field of blast design of wood structures. The output from the research will yield data that would introduce provisions to the blast design standard. Ductility ratios and support rotations for various levels of protection and values for the dynamic increase factor are important examples of potential contributions to the profession. The research program will help ensure that engineers in Canada have the best possible knowledge and information to support design decisions for wood structures. Furthering knowledge on the behaviour of timber structures under blast loads will improve safety while adding highly trained and dedicated professionals to the Canadian workforce. Importance and novelty of the proposed research is the creation of material models for wood elements, which will enable analysts to predict behaviour of timber buildings subjected to blast loading without reliance on empiricism. Intent is to enable a leap from need to rely on prescriptive method to engineering blast design practice, which is comparable to the transition which took fire design of timber buildings from an art to an applied science in the late 20th century.******

木材本质上是轻质，柔软和脆弱的，这意味着不希望以充分保护乘员免受意外和故意爆炸的方式抵抗爆炸装载。特别是，保护人类的生命需要预防渐进式崩溃和碎片扔最小化。申请人和合作者使用渥太华大学使用独特的冲击管设施的研究已经影响了加拿大的爆炸相关设计代码要求。无论多么多。*******拟议研究的总体目标是减轻与木材建筑物上的爆炸负荷相关的危害。这将通过建立风险评估策略并在技术和经济上为新建筑物和现有建筑物开发创新的改造方法来实现。该研究计划将生成全新的信息，并成为HQP研究培训的基础。研究计划的实验组成部分的主要重点是建立重型木材元素的行为，并为可能容易受到爆炸事件的现有建筑物设计改造选项。这包括检查纤维增强聚合物的影响以对木材元素提供限制，并使用钢盖电缆和碳FRP棒的使用后张紧技术。分析组件将包括开发非线性材料合规模型。一旦开发和验证，这些模型将用于对建筑结构和子结构的动态分析和参数研究。木结构。研究的输出将产生将爆炸设计标准介绍的数据。延性比和支持旋转的各种保护级别的动态增加因素是对职业潜在贡献的重要例子。该研究计划将有助于确保加拿大的工程师拥有最好的知识和信息，以支持木结构的设计决策。在爆炸负载下，进一步了解木材结构的行为将提高安全性，同时为加拿大劳动力增加训练有素且专门的专业人士。拟议的研究的重要性和新颖性是为木材元素创建材料模型，这将使​​分析师能够预测受到爆炸负荷的木材建筑物的行为，而无需依赖经验主义。意图是要从需要依靠规定方法到工程爆炸设计实践的需要，这与在20世纪后期从艺术到应用科学的木材设计的过渡相媲美。***** ***** *