GFRP筋混凝土梁耐火性能计算方法
发布时间：2019-08-07 09:47
【摘要】：通过GFRP筋混凝土梁耐火性能的理论分析与有限元计算,提出GFRP筋混凝土结构耐火性能的计算方法。在合理选择GFRP和混凝土材料的热工参数、高温力学参数的基础上,采用有限元分析软件ABAQUS建立三面受火的GFRP筋混凝土梁的高温热力学模型。经与GFRP筋混凝土梁火灾试验结果的对比验证,该高温力学模型具有较高的精确性。对影响GFRP筋混凝土梁高温力学性能的各参数进行有限元分析,结果表明,影响梁耐火性能的主要因素为梁上作用的荷载比、GFRP筋在混凝土截面的位置和受火时间。参考欧洲规范钢筋混凝土抗火性能的设计方法,提出GFRP筋混凝土构件基于力学性能的耐火设计公式。通过混凝土500℃等温线简化受火面积和GFRP筋高温强度等效换算的方式,将火灾下截面的非均匀材料力学性质转变为随受火时间变化的均匀材料,提出了不同受火时刻GFRP筋混凝土受弯构件的承载力计算式。经与有限元分析结果的对比,该计算方法精度较高,可应用于评估不同受火时刻下GFRP筋混凝土的高温承载力。
[Abstract]:Through the theoretical analysis and finite element calculation of the fire resistance of the GFRP reinforced concrete beam, the calculation method of the fire resistance of the GFRP reinforced concrete structure is proposed. On the basis of reasonable selection of thermal parameters and high-temperature mechanical parameters of GFRP and concrete materials, a high-temperature thermodynamic model of GFRP reinforced concrete beams with three-side fire is established by using the finite element analysis software ABAQUS. The results of the fire test of GFRP reinforced concrete beam show that the high-temperature mechanical model has high accuracy. The finite element analysis of the parameters of the high-temperature mechanical properties of the GFRP-reinforced concrete beam is carried out. The results show that the main factors that influence the fire-resistance of the beam are the load ratio of the beam, the position of the GFRP bar in the section of the concrete and the time of fire. With reference to the design method of the fire resistance of reinforced concrete in Europe, a fire-resistant design formula based on the mechanical property of the GFRP reinforced concrete component is proposed. In this paper, the non-uniform mechanical properties of the cross-section of the fire are changed into the uniform material with the change of the fire time by the method of simplifying the equivalent conversion of the heat-receiving area and the high-temperature strength of the GFRP rib through the 500-degree-C isotherm of the concrete, and the bearing capacity calculation formula of the GFRP-reinforced concrete flexural member at different fire-receiving time is proposed. Compared with the finite element analysis, the method has high precision and can be used to evaluate the high-temperature bearing capacity of GFRP rib concrete at different fire-receiving time.
【作者单位】： 哈尔滨工业大学深圳研究生院;深圳市建筑科学研究院有限公司;
【基金】：亚热带建筑科学国家重点实验室开放基金项目(2009KB20)
【分类号】：TU377
[Abstract]:Through the theoretical analysis and finite element calculation of the fire resistance of the GFRP reinforced concrete beam, the calculation method of the fire resistance of the GFRP reinforced concrete structure is proposed. On the basis of reasonable selection of thermal parameters and high-temperature mechanical parameters of GFRP and concrete materials, a high-temperature thermodynamic model of GFRP reinforced concrete beams with three-side fire is established by using the finite element analysis software ABAQUS. The results of the fire test of GFRP reinforced concrete beam show that the high-temperature mechanical model has high accuracy. The finite element analysis of the parameters of the high-temperature mechanical properties of the GFRP-reinforced concrete beam is carried out. The results show that the main factors that influence the fire-resistance of the beam are the load ratio of the beam, the position of the GFRP bar in the section of the concrete and the time of fire. With reference to the design method of the fire resistance of reinforced concrete in Europe, a fire-resistant design formula based on the mechanical property of the GFRP reinforced concrete component is proposed. In this paper, the non-uniform mechanical properties of the cross-section of the fire are changed into the uniform material with the change of the fire time by the method of simplifying the equivalent conversion of the heat-receiving area and the high-temperature strength of the GFRP rib through the 500-degree-C isotherm of the concrete, and the bearing capacity calculation formula of the GFRP-reinforced concrete flexural member at different fire-receiving time is proposed. Compared with the finite element analysis, the method has high precision and can be used to evaluate the high-temperature bearing capacity of GFRP rib concrete at different fire-receiving time.
【作者单位】： 哈尔滨工业大学深圳研究生院;深圳市建筑科学研究院有限公司;
【基金】：亚热带建筑科学国家重点实验室开放基金项目(2009KB20)
【分类号】：TU377
【参考文献】
相关期刊论文 前5条
1 查晓雄;王晓璐;谢先义;;GFRP筋混凝土梁耐火性能的试验研究[J];防灾减灾工程学报;2012年01期
2 王晓璐;g，
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