Performance of reinforced concrete elements subjected to extreme loads

极端荷载下钢筋混凝土构件的性能

• 批准号: 311569-2007
• 负责人: Palermo, Daniel
• 金额: $ 1.24万
• 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: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=396403
• 关键词: Performance; reinforced; concrete; elements; subjected

The increasing occurrence of extreme loads, those demonstrating dynamic characteristics such as earthquake excitations, tsunami-induced hydrodynamic forces, and maliciously-intended blast loading, has brought to the fore the escalating threat to our infrastructure, life safety, and economic stability.  The recent terrorist bombings of the London, England Subway System on July 7, 2005, the resort island of Bali, Indonesia on October 12, 2002, and the Alfred P. Murrah Building in Oklahoma City on April 19, 1995, and the catastrophic events of the Asian Tsunami of 2004, and the Pakistani Earthquake of 2005 have demonstrated that such hazards are not easily suppressed and continue to disturb society's quest for safety and security.  Terrorist experts agree that it is only a matter of time before Canada is targeted by terrorist activity.   Modern building codes, however, have explicitly only provided guidelines for the forces that arise due to the ground shaking experienced during an earthquake - little attention has been given to the actions of blast loading on civilian structures and the effects of hydrodynamic forces on shoreline structures.     This proposal is focused specifically to address the performance of critical reinforced concrete elements subjected to maliciously-intended blast loading.  The applicant's experience in constitutive and nonlinear finite element modeling and large-scale testing for extreme loads provides the expertise for this study. The short term objectives are: 1. To develop capacity relationships for critical structural elements to evaluate damage for a given blast event and determine residual load-bearing capacity for progressive collapse analysis. 2. To advance seismic detailing methodologies to improve blast-resistant design of critical elements in new construction, such that damage due to progressive collapse is mitigated. 3. To assess retrofit techniques for critical elements in existing structures to mitigate the blast hazard and impede progressive collapse.

极端荷载的出现越来越频繁，这些荷载表现出动态特性，如地震激励、海啸引起的水动力和恶意爆炸荷载，这些荷载对我们的基础设施、生命安全和经济稳定性的威胁不断升级。2005年7月7日，英国伦敦地铁系统、度假胜地巴厘岛、印度尼西亚2002年10月12日、俄克拉荷马州Alfred P. Murrah大厦1995年4月19日，以及2004年亚洲海啸的灾难性事件，和2005年巴基斯坦地震表明，这种危险不容易被压制，并继续扰乱社会对安全和安保的追求。加拿大成为恐怖活动的目标只是时间问题。 然而，现代建筑规范仅明确规定了地震期间地面震动产生的力的指导原则-很少关注爆炸荷载对民用建筑物的作用以及水动力对海岸线建筑物的影响。 本提案专门针对遭受恶意爆炸荷载的关键钢筋混凝土元件的性能，申请人在本构和非线性有限元建模以及极端荷载大规模测试方面的经验为本研究提供了专业知识。短期目标是：1。建立关键结构元件的能力关系，以评估特定爆炸事件的损坏情况，并确定用于连续倒塌分析的剩余承载能力。2.推进抗震设计方法，以改善新建筑中关键构件的抗爆设计，从而减轻连续倒塌造成的破坏。3.评估现有结构中关键元件的改造技术，以减轻爆炸危险并防止连续倒塌。