海洋环境损伤与高温耦合下混凝土柱抗火性能试验研究
发布时间：2019-03-13 09:52
【摘要】：为了研究受海洋环境损伤后的钢筋混凝土轴压柱的抗火性能，，确立氯离子侵蚀损伤（裂缝宽度ω）对柱截面温度场分布及钢筋力学性能的影响，建立损伤指标和混凝土结构抗火性能退化规律之间的量化关系，重现海洋环境火灾下混凝土结构的生命反应。本文对3根足尺寸钢筋混凝土轴压柱进行了快速氯离子侵蚀试验，模拟海洋环境损伤，以纵向受力钢筋锈蚀产生不同宽度的裂缝为前提，对混凝土柱的火灾性能进行试验研究，为数值分析提供数据支持。通过分析使用损伤和地震损伤后混凝土抗火性能研究的成果，确定本文主要研究内容如下： （1）分析国内外抗火研究的现状，系统的阐述了钢筋和混凝土的高温力学性能和材料的热工性能，为数值计算提供理论依据； （2）对试件进行快速氯离子侵蚀试验，模拟试件海洋环境下的损伤，以纵筋锈胀裂缝宽度为初始损伤指标； （3）通过法拉利定律和钢筋锈蚀试验，准确测定钢筋的锈蚀情况，评估锈蚀钢筋的力学性能； （4）对氯离子损伤后的钢筋混凝土柱进行火灾试验研究，探究初始损伤柱子的火灾破坏情况和温度场变化规律； （5）根据各试件截面的温度场，对高温下和高温后的混凝土轴压柱的承载力进行分析，完善既有混凝土结构抗火理论并为火灾后结构性能评定与修复加固提供理论基础。
[Abstract]:In order to study the fire resistance of reinforced concrete axial compression columns damaged by marine environment, the influence of chloride ion erosion damage (crack width 蠅) on the temperature distribution and mechanical properties of reinforced concrete columns was established. The quantitative relationship between damage index and fire resistance degradation law of concrete structure is established to reproduce the life response of concrete structure under marine environment fire. In this paper, three fully sized reinforced concrete columns subjected to axial compression were subjected to rapid chloride ion erosion tests to simulate marine environmental damage. On the premise of longitudinal corrosion of steel bars with different widths of cracks, the fire performance of concrete columns was tested and studied. Provide data support for numerical analysis. The main research contents of this paper are as follows: (1) analyzing the present situation of fire resistance research at home and abroad by analyzing the research results of concrete fire resistance after use of damage and earthquake damage. The mechanical properties of steel bars and concrete at high temperature and the thermal properties of materials are systematically described, which provides a theoretical basis for numerical calculation. (2) the rapid chloride ion erosion test was carried out to simulate the damage of the specimen under the marine environment, and the initial damage index was the width of the longitudinal bar rust expansion crack; (3) through Ferrari's law and steel bar corrosion test, the corrosion of steel bar is determined accurately, and the mechanical properties of corroded steel bar are evaluated. (4) the fire test of RC columns damaged by chloride ion is carried out, and the fire failure and temperature field of the columns are studied. (5) according to the temperature field of each specimen section, the bearing capacity of concrete axial compression column at high temperature and after high temperature is analyzed. Improve the fire resistance theory of existing concrete structures and provide a theoretical basis for post-fire structural performance evaluation and repair and reinforcement.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV33
本文编号：2439290
[Abstract]:In order to study the fire resistance of reinforced concrete axial compression columns damaged by marine environment, the influence of chloride ion erosion damage (crack width 蠅) on the temperature distribution and mechanical properties of reinforced concrete columns was established. The quantitative relationship between damage index and fire resistance degradation law of concrete structure is established to reproduce the life response of concrete structure under marine environment fire. In this paper, three fully sized reinforced concrete columns subjected to axial compression were subjected to rapid chloride ion erosion tests to simulate marine environmental damage. On the premise of longitudinal corrosion of steel bars with different widths of cracks, the fire performance of concrete columns was tested and studied. Provide data support for numerical analysis. The main research contents of this paper are as follows: (1) analyzing the present situation of fire resistance research at home and abroad by analyzing the research results of concrete fire resistance after use of damage and earthquake damage. The mechanical properties of steel bars and concrete at high temperature and the thermal properties of materials are systematically described, which provides a theoretical basis for numerical calculation. (2) the rapid chloride ion erosion test was carried out to simulate the damage of the specimen under the marine environment, and the initial damage index was the width of the longitudinal bar rust expansion crack; (3) through Ferrari's law and steel bar corrosion test, the corrosion of steel bar is determined accurately, and the mechanical properties of corroded steel bar are evaluated. (4) the fire test of RC columns damaged by chloride ion is carried out, and the fire failure and temperature field of the columns are studied. (5) according to the temperature field of each specimen section, the bearing capacity of concrete axial compression column at high temperature and after high temperature is analyzed. Improve the fire resistance theory of existing concrete structures and provide a theoretical basis for post-fire structural performance evaluation and repair and reinforcement.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV33
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