Further investigations to describe the material behaviour of concrete in the fire cooling phase

进一步研究描述混凝土在火冷却阶段的材料行为

• 批准号: 467536273
• 负责人: Professor Dr.-Ing. Jochen Zehfuß
• 金额: --
• 依托单位: Fachgebiet Brandschutz
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/467536273?language=en
• 关键词: Further; investigations; describe; material; behaviour

In the course of the follow-up application of the DFG-funded research project applied for here, uncertainties still existing due to only limited experimental findings are to be eliminated on the basis of experimental investigations and numerical parameter studies in order to be able to formulate a general design approach for the consideration of the material behaviour of standardised concretes in the cooling phase of fires. Since the number of available experimental results for the determination of the thermal conductivity and the thermo-mechanical behaviour of concrete in the fire cooling phase is small, only first approaches for material parameters in the cooling phase are available due to the complexity of the problem and due to the multitude of possible temperature exposures in the cooling phase (cooling rate, max. temperature) as well as further parameters such as degree of loading and concrete strength (CC compared to HPC). In order to ensure and extend the existing knowledge from the previous project and to develop a general design approach, further experimental and numerical investigations for the cooling phase after reaching high temperatures (≥ 500 °C) shall be carried out in the applied project.The objectives of the research project applied for here can be subdivided according to the subitems listed below:- Experimental investigation of the thermal conductivity and stress-strain behaviour of normal-strength and high-strength concrete during the cooling phase,- Development of constitutive material laws for the fire cooling phase as a general design approach for standardised normal-strength and high-strength concrete on the basis of the knowledge gained from experimental investigations- Validation of the derived material laws in numerical investigations through real-scale fire tests on loaded reinforced concrete columns.

在DFG资助的研究项目的后续应用过程中，由于只有有限的实验结果而仍然存在的不确定性将在实验研究和数值参数研究的基础上消除，以便能够制定一个通用的设计方法，用于考虑标准化混凝土在火灾冷却阶段的材料行为。 由于用于确定混凝土在火冷却阶段的导热性和热机械行为的可用实验结果的数量很少，由于问题的复杂性和由于冷却阶段的大量可能的温度暴露（冷却速率，最大值），只有冷却阶段的材料参数的第一方法可用。温度）以及其他参数，如加载程度和混凝土强度（CC与HPC相比）。为了确保和扩展以前项目的现有知识，并开发一种通用的设计方法，进一步的实验和数值研究达到高温后的冷却阶段（≥ 500 °C），本申请研究项目的目标可按以下分项进行细分：- 在冷却阶段对普通强度和高强度混凝土的导热性和应力-应变行为进行实验研究，- 制定火灾冷却阶段的本构材料定律，作为标准化正常强度和高强度的一般设计方法，基于实验研究获得的知识的混凝土强度--通过对加载的钢筋混凝土柱的真实比例火灾试验，验证数值研究中导出的材料定律。