| 摘要: |
| 通过对带（预制）裂缝混凝土试件进行明火升温试验，研究高温下裂缝对混凝土温度场的影响.依据传热理论分析建立带裂缝混凝土试件截面温度计算模型，然后用数学软件MATLAB进行数值计算并与试验结果进行对比.结果表明：高温下裂缝区域的主要传热方式为热传导；相对于无裂缝处，有裂缝处测点温度更高；总体上测点的温度随裂缝宽度的增大而增大，远离裂缝的测点温度受裂缝的影响较小；不同测点的计算与实测升温曲线总体变化趋势一致，依据传热理论分析建立的带裂缝混凝土试件截面温度计算模型较为可靠. |
| 关键词: 混凝土 裂缝 高温 温度场 |
| DOI：103969/j.issn1007 9629201604021 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51179081） |
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| Influence of Crack on Temperature Field of Concrete at Elevated Temperature |
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BA Guangzhong1, MIAO Jijun2, ZHANG Weiping1, JI Lina2
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1.Department of Structral Engineering, Tongji University, Shanghai 200092, China;2.College of Civil Engineering, Qindao Technological University, Qingdao 266033, China
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| Abstract: |
| Concrete specimens with pre made cracks were tested at elevated temperatures to investigate the effect of crack on temperature field of concrete subjected to fire. The model for calculating the temperature of section in cracked concrete was established based on theoretical analysis of heat transfer. The temperatures of section in cracked concrete were calculated by mathematical software MATLAB and compared with the test results. The results show that heat conduction is the main way of heat transfer in cracked concrete. There is an increase in the temperature of measured point in cracked regions in comparison with that in undamaged regions. On the whole, the temperature of measured point increases with the increase of width of crack, and the temperature of measured point away from crack is less affected by the crack. The calculated temperatures are generally consistent with the test results, and the model for calculating the temperature of section in cracked concrete based on theoretical analysis of heat transfer is reliable. |
| Key words: concrete crack elevated temperature temperature field |
