Guidelines for Enhancing Fire Endurance of High Strength Concrete Columns

摘要：美国是工业化国家中火灾损失最严重的国家之一，在消防科学和工程领域，结构消防安全是最不发达的。火灾是建筑物可能遇到的最恶劣的环境条件之一，因此，为结构构件提供适当的消防安全措施是设计的一个重要方面。钢筋混凝土结构体系在高层建筑中使用非常频繁，近年来，由于结构性能的改善，例如高强度和耐久性，高强混凝土（HSC）的使用变得越来越普遍。本研究将从发展HSC高温材料特性的本构关系开始。将开发一个计算机程序形式的数值模型，用于跟踪火灾暴露下HSC柱的响应。基于理论传热学和力学原理，采用耦合传热/应变平衡分析来估计高强混凝土柱在火灾下的行为。该模型将通过一系列的耐火试验，将进行HSC列使用测试数据进行验证。验证的数值模型将被用来carryout一系列的参数研究，以确定各种因素，支配HSC柱的耐火性能。从参数研究和实验的结果将被用来制定合理的和具有成本效益的指导方针的防火设计的HSC列。

Abstract: The United States has one of the worst fire loss records in the industrialized world and within the area of fire science and engineering, structural fire safety is the least developed. Fire represents one of the most severe environmental conditions to which structures may be subjected, and hence, the provision of appropriate fire safety measures for structural members is an important aspect of design. Reinforced concrete structural systems are quite frequently used in high-rise buildings and in recent years, the use of high strength concrete (HSC) is becoming more popular due to the improvements in structural performance such as high-strength and durability. This research will start with the development of constitutive relationships for high temperature material properties of HSC. A numerical model, in the form of a computer program, will be developed for tracing the response of HSC columns under fire exposure. The behavior of an HSC column subjected to fire will be estimated using coupled heat transfer/strain equilibrium analysis based on theoretical heat transfer and mechanics principles. The model will be validated using test data obtained through a series of fire resistance experiments that will be conducted on HSC columns. The verified numerical model will be utilized to carryout a series of parametric studies to determine various factors that govern the fire resistance of HSC columns. Results from parametric studies and experiments will be used to develop rational and cost-effective guidelines for fire safety design of HSC columns.