预应力混凝土空心板梁火灾中行为特点的试验研究

发布时间：2018-02-28 20:50

本文关键词： 桥梁工程预应力混凝土梁试验研究温度场与变形分析爆裂有限元分析应力应变计算　出处：《公路交通科技》2017年01期 　论文类型：期刊论文

【摘要】：桥梁结构遭受火灾时内部会产生不均匀的温度场,温度场的分布及其随时间的变化十分复杂。开展室内火灾试验,使3片足尺预应力混凝土空心板梁经受不同程度的火损,探究试验梁的温度场分布、梁体变形以及应力应变的变化规律。3片试验梁在相同的火场温度(仅受火时间不同)下进行火灾模拟,各片梁的爆裂程度却不相同,在进行温度场计算时需考虑每片梁的混凝土爆裂程度。借助有限元软件ANSYS模拟梁体的温度场时考虑实际爆裂情况,得到的计算结果与试验数据吻合度较好。各片梁经受火灾时的应变变形具有相似的规律性,借助有限元软件ABAQUS得到梁体的受力和变形计算模型,计算结果显示在火损时间小于1 h时,模型与实测吻合较好,可用于分析大部分的实际火灾情况。
[Abstract]:When the bridge structure suffers from fire, there will be uneven temperature field inside, and the distribution of temperature field and its variation with time are very complicated. The indoor fire test is carried out to make three full-scale prestressed concrete hollow slab beams suffer different degrees of fire damage. The distribution of temperature field of test beam, the variation of beam deformation and stress and strain. .3 the fire simulation of test beam under the same fire temperature (only different fire time) is carried out, but the burst degree of each beam is different. In the calculation of temperature field, the concrete bursting degree of each beam should be considered, and the actual burst should be considered when simulating the temperature field of beam body with the help of finite element software ANSYS. The calculated results are in good agreement with the experimental data. The strain and deformation of beam subjected to fire have similar regularity. The stress and deformation calculation model of beam is obtained by means of finite element software ABAQUS. The calculated results show that when the time of fire loss is less than 1 h, the model is in good agreement with the measured results, which can be used to analyze most of the actual fire conditions.
【作者单位】：东南大学交通学院;上海林同炎李国豪土建工程咨询有限公司南京分公司;
【分类号】：U446

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