Structural Performance of Post-Tensioned Building Systems under Realistic Fire Exposure

后张法建筑体系因其跨度大，深受设计者的欢迎。这一趋势给消防安全结构设计带来了新的挑战。除了这些建筑系统的复杂性外，火灾在大空间中的表现与在小房间中的不同。火灾的严重程度和大小会影响裸露结构的结构反应。为了以符合成本效益的方式确保安全，需要适用于这些建筑系统的消防设计指南。这项拟议的研究计划将研究在各种供暖方案下通常用于大跨度(混凝土、木材)的后张法建筑系统。这些系统因其在火灾中的结构性能而受到有限的研究关注。这项研究的总体目标是了解火灾中后张法结构的结构性能，最终目的是发现真正的火灾如何影响整个后张法建筑。考虑到在火灾中测试整个建筑的高昂成本，数值建模工具是必不可少的。需要实验数据来支持数值计算的努力。因此，本研究计划旨在实现以下目标：(1)创建一种新型的半主动回馈加热系统，能够在明确的火灾暴露后对大跨度建筑系统进行加热；(2)探索和了解这些建筑系统在各种火灾场景下的基本机制；以及(3)开发经过验证的建模技术，以描述这些建筑系统对火灾的反应。该研究项目将培养7名研究生和5名本科生高素质人才，以应用研究成果满足社会消防需求。考虑后张法建筑系统如何应对现实火灾情况的活动一直很少。将获得测试设备、实验数据和对火灾引起的结构性能的新见解，以解决这一知识鸿沟。这将帮助全球工程师、建筑师和从业者社区制定客观的、基于性能的火灾设计方法。我们的国家社区将受益，因为本计划中考虑的一些建筑系统在加拿大并未普遍应用。这项研究将为实施创新的建筑系统开发适当的知识和建议。**

Post-tensioned building systems are popular with designers as they allow long spans. This trend brings new challenges in the design of structures for fire safety. In addition to the complexity of these building systems, fires behave differently in large spaces than they do in small rooms. The severity and size of fires affects the structural response of exposed structures. To ensure safety in a cost-effective manner, fire design guidance appropriate to these building systems is required. This proposed research program will investigate post-tensioned building systems typically used for long spans (concrete, timber) under various heating scenarios. These systems have seen limited research attention for their structural performance in fire. The overarching objective of this research is to develop an understanding of the structural performance of post-tensioned structures in fire, with the ultimate aim of discovering how real fires impact whole post-tensioned buildings. Given the high cost of testing whole buildings in fire, numerical modelling tools are essential. There is a need for experimental data to support numerical efforts. This research program therefore seeks to meet the following objectives:(1) create a novel semi-active feedback heating system capable of heating long-span building systems following a well-defined fire exposure; (2) explore and understand the fundamental mechanisms of these building systems under a variety of fire scenarios; and (3) develop validated modelling technologies to describe the response of these building systems to fire. This research program will train 7 graduate and 5 undergraduate highly qualified personnel to apply the research findings to meet society's fire protection requirements. There has been a dearth of activity considering how post-tensioned building systems respond to realistic fire conditions. Test equipment, experimental data, and novel insights into fire-induced structural performance will be obtained to address this knowledge gap. This will help global communities of engineers, architects, and practitioners develop objective and performance-based fire design methodologies. Our national community will benefit, as some building systems considered in this program have not commonly been applied in Canada. This research will develop suitable knowledge and recommendations for the implementation of innovative building systems.**