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Analytical Method of Temperature Prediction in Reinforced Concrete Beams

机译：钢筋混凝土梁温度预测的解析方法

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摘要

The determination of temperature profile within a reinforced concrete (RC) beam is essential for carrying out structural analysis at elevated temperatures. The temperatures are usually estimated using sophisticated numerical techniques which require computational support. Since the determination of rebar temperature in RC beams is more important than the concrete temperature a reliable analytical method of temperature prediction can become a helpful tool in simple beam analysis problems which are employed for determining residual strength in fire. This paper presents the details of development of an empirical equation for the prediction of temperature of rebar in RC beams. The equation is also capable of predicting concrete temperatures at different locations within the beam. The predictions made by the equation were compared with the temperatures determined from experimental beam testing and finite element (FE) analysis. A good correlation of the predicted temperatures was found for the entire time-temperature history with both the observed data and the estimated temperatures by FE models.
机译：确定钢筋混凝土（RC）横梁内的温度曲线对于在高温下进行结构分析至关重要。通常使用需要计算支持的复杂数值技术估算温度。由于钢筋混凝土梁中钢筋温度的确定比混凝土温度更为重要，因此可靠的温度预测分析方法可以成为简单梁分析问题的有用工具，这些问题可用于确定火灾中的残余强度。本文详细介绍了用于预测钢筋混凝土梁中钢筋温度的经验公式的详细信息。该方程还能够预测梁内不同位置的混凝土温度。将方程式的预测结果与通过实验光束测试和有限元（FE）分析确定的温度进行比较。在整个时间-温度历史记录中，预测温度与观测数据和有限元模型估算的温度都具有良好的相关性。

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