锈蚀H型钢柱偏心受压性能的试验研究与分析

发布时间：2018-04-30 02:01

本文选题：锈蚀钢结构 + 表面腐蚀深度　；参考：《西安建筑科技大学》2013年硕士论文

【摘要】：近年来随着钢结构在我国工程建设领域的广泛应用，锈蚀对钢结构的影响也越来越突出。钢材的锈蚀不仅会造成材料的浪费，更重要的是锈蚀会显著影响钢结构的截面尺寸及表面特征，进而造成钢材强度，塑性等材料性能的改变，对服役钢结构的承载力和安全性带来很大影响。研究锈蚀对钢结构承载性能的影响不仅可以揭示服役钢结构安全性的变化，同时还能为服役钢结构工程的鉴定加固与寿命预测奠定基础。本文以Q235热轧H型钢为研究对象，通过大气盐雾加速锈蚀试验模拟大气自然腐蚀。本文借助于三维非接触式光学轮廓仪，测试不同锈蚀程度下的八组试件表面的三维形貌特征，利用软件分析功能获得三维形貌图和轮廓图，得到测试表面区域内每一点的腐蚀深度。通过对腐蚀深度的统计分析，得出钢结构表面腐蚀深度的分布规律。本文通过15个锈蚀拉伸试件，探究锈蚀对钢材材料强度、伸长率、弹性模量等力学参数的影响，并得到其随锈蚀程度的变化规律。通过5根锈蚀H型钢柱的偏心受压的试验，研究锈蚀对H型钢柱偏心受压承载力的影响，揭示其锈蚀程度与偏心受压承载力的变化规律及偏心受压的破坏机理。本文考虑锈蚀引起的服役钢结构抗力的衰减，通过统计钢结构材料强度、截面尺寸的特征参数（均值与标准差）变化探究服役钢结构可靠指标的计算。
[Abstract]:In recent years, with the wide application of steel structures in the field of engineering construction in China, the effect of corrosion on steel structures is becoming more and more prominent. The corrosion of steel will not only cause waste of materials, but also will significantly affect the cross section size and surface characteristics of steel structures, thus causing changes in the strength and plasticity of steel materials. It has great influence on the bearing capacity and safety of the steel structure in service. The study of the effect of corrosion on the bearing capacity of steel structures can not only reveal the change of the safety of service steel structures, but also lay a foundation for the identification, reinforcement and life prediction of service steel structures. In this paper, the atmospheric natural corrosion of Q235 hot rolled H section steel was simulated by accelerated corrosion test of atmospheric salt spray. In this paper, by means of a three-dimensional contactless optical profilometer, the surface features of eight groups of specimens with different corrosion degrees are tested, and the three-dimensional topography and contour are obtained by using the function of software analysis. The corrosion depth of each point in the test surface area is obtained. Through the statistical analysis of corrosion depth, the distribution of corrosion depth on steel structure surface is obtained. In this paper, the effects of corrosion on strength, elongation and elastic modulus of steel materials were investigated through 15 specimens of corroded tensile test, and the variation law of corrosion degree was obtained. The effect of corrosion on the eccentric compressive capacity of H section steel columns was studied through the eccentric compression tests of 5 corroded H-shaped steel columns. The variation law of corrosion degree and eccentric compressive capacity and the failure mechanism of eccentric compression were revealed. In this paper, the decay of the resistance of service steel structure caused by corrosion is considered. The calculation of reliability index of service steel structure is studied by statistics of the characteristic parameters (mean and standard deviation) of material strength and section size of steel structure.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU392.1

【参考文献】