Numerical analysis of the load capacity of reinforced concrete structures in case of fire

火灾时钢筋混凝土结构承载能力数值分析

• 批准号: 242418550
• 负责人: Professor Dr.-Ing. Dieter Dinkler
• 金额: --
• 依托单位: Institut für Statik und Dynamik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/242418550?language=en
• 关键词: Numerical; analysis; load; capacity; reinforced

The proof of the safety of reinforced concrete structures follows usually on basis of experimental investigations. By means of the results the fire resistance is certificated as duration of fire resistance F30 etc.Goal of the project is the development of a model, which is able to investigate numerically the development of the load carrying behavior of reinforced concrete structures under fire. The numerical analysis of the load carrying behavior of reinforced concrete structures in case of fire is very complex, because mechanics and chemical degradation of the materials have to be coupled with the transport processes of heat and water accompanied by the phase transition to vapor. Modeling of the equations leads to a multi-scale problem in space and time domain, which could be solved only by application of very advanced numerical procedures.Up to now the own models are able to describe the behavior of concrete under high temperature with a multi-physics approximation. By means of the current application of support the model will be extended by the behavior of steel and the process zone between steel and concrete. The model equations will describe the behavior in the framework of continuum damage mechanics and will be solved by the finite element method. The overall model will be able to investigate the load carrying behavior of reinforced concrete structures numerically.

钢筋混凝土结构的安全性的证明通常基于实验研究。通过计算结果，确定了耐火极限为耐火极限F30等。本项目的目标是建立一个模型，该模型能够数值地研究火灾下钢筋混凝土结构的承载性能的发展。火灾下钢筋混凝土结构承载性能的数值分析是非常复杂的，因为材料的力学和化学降解必须与热量和水的传输过程相耦合，伴随着相变到蒸汽。这些方程的建模导致了一个时空域的多尺度问题，只有应用非常先进的数值方法才能解决。到目前为止，已有的模型能够以多物理场近似来描述混凝土在高温下的行为。根据目前支护的应用情况，将模型扩展到钢筋的性能和钢筋与混凝土之间的过程区。模型方程将在连续损伤力学的框架内描述行为，并将通过有限元方法求解。整体模型将能够研究钢筋混凝土结构的承载性能的数值。