中性盐雾环境下锈蚀H型钢表面特征及偏压承载性能研究

发布时间：2018-04-19 04:16

本文选题：锈蚀H型钢 + 表面特征　；参考：《西安建筑科技大学》2014年博士论文

【摘要】：论文采用理论分析、试验研究及非线性随机有限元分析相结合的方法，围绕锈蚀H型钢表面随机特征参数、表面锈蚀深度随机场模型、承载性能、抗力随机模型及其可靠性等方面进行了系统地研究。主要研究工作包括以下几个方面： (1)中性盐雾环境下H型钢表面锈蚀深度统计分析论文借助美国NANOVEA公司生产的PS50三维非接触式表面形貌仪，对中性盐雾环境下Q235H型钢表面锈蚀深度进行了测试，获得了H型钢表面锈蚀深度及其表面轮廓，并对其表面锈蚀深度进行了统计分析，结果表明，中性盐雾环境下不同锈蚀程度的H型钢表面锈蚀深度服从正态分布。 (2)中性盐雾环境下H型钢表面锈蚀深度随机场模型论文利用PS50三维非接触式表面形貌仪测试所得的锈蚀深度数据，对H型钢表面锈蚀深度的平稳性和各态历经性进行了检验，结果表明，H型钢表面锈蚀深度随机场{h(z)}具有平稳性和各态历经性。论文以H型钢锈蚀表面轮廓集合作为H型钢表面锈蚀深度随机场{h(z)}的样本函数族，并借助三角余弦函数对该样本函数族进行数学解析，，建立了中性盐雾环境下，不同锈蚀程度的H型钢表面锈蚀深度随机场{h(z)}模型。 (3)锈蚀H型钢偏心受压承载性能试验研究论文通过10根锈蚀及2根未锈蚀Q235H型钢的偏心受压试验，研究了锈蚀H型钢偏心受压构件承载性能及其材料力学性能退化规律，建立了锈蚀H型钢偏心受压构件承载力、柱中挠度计算模型及锈蚀Q235钢屈服强度、极限强度及极限伸长率随锈蚀程度增加而递减的规律。本文分别针对受拉翼缘、受压翼缘及腹板锈蚀对H型钢偏心受压构件承载性能的影响进行了分析探讨，结果表明，翼缘锈蚀对H型钢偏心受压承载性能影响较腹板锈蚀显著，且受压翼缘锈蚀比受拉翼缘锈蚀对H型钢偏心受压承载性能的影响更加显著。 (4)锈蚀H型钢偏压构件承载性能非线性随机有限元分析论文采用平面应力单元与平板弯曲单元，建立了平面壳体面内、面外及其非线性单元随机刚度与总体随机刚度。借助C++语言编制了锈蚀钢结构随机有限元分析程序，对H型钢偏压构件承载性能进行了计算分析，并与试验结果进行了比对，结果表明，随机有限元是分析锈蚀钢结构承载性能的有效手段，可以有效模拟锈蚀钢结构截面厚度随机特性，获得锈蚀钢结构（构件）抗力及荷载效应的统计特征参数。 (5)锈蚀H型钢偏压构件抗力随机模型及其可靠性分析论文通过锈蚀H型钢偏压构件抗力随机模型，分析了锈蚀对H型钢偏压抗力均值及抗力变异系数的影响，分析结果表明，H型钢偏压构件抗力均值随锈蚀程度的增加而递减，其抗力变异系数随锈蚀程度增加而递增。论文通过锈蚀H型钢偏压构件可靠性分析，探讨了锈蚀对钢结构及其构件可靠指标的影响，结果表明，服役钢结构遭受锈蚀损伤后，结构及其构件可靠指标随锈蚀程度增加而递减。
[Abstract]:Based on theoretical analysis, experimental research and nonlinear stochastic finite element analysis, the random characteristic parameters of rusted H steel surface, the model of surface corrosion depth, the bearing capacity, the random model of resistance and its reliability are systematically studied.
The main research work includes the following aspects:
(1) statistical analysis of the surface corrosion depth of H steel under neutral salt fog
With the help of PS50 three-dimensional non-contact surface profilometer produced by American NANOVEA company, the neutral salt fog environment Q235H steel surface corrosion depth were tested to obtain the H steel surface corrosion depth and surface profile, and the surface corrosion depth was analyzed, the results show that the corrosion depth of steel surface H the different corrosion degree of neutral salt fog environment obeys normal distribution.
(2) surface corrosion depth of H steel surface under neutral salt fog environment with the model of Airport
In this paper, the corrosion depth data measured by PS50 3D non-contact surface profiler are used to test the smoothness and ergodic nature of the corrosion depth of H steel surface. The results show that the corrosion depth of H steel surface is stable and ergodic with the airport {h (z)}.
Collection of papers as H type of corroded steel surface to {h depth with the airport surface profile of H type steel corrosion (z) sample functions and the triangle}, the cosine function of mathematical analysis on the sample functions, a neutral salt fog environment, H type of corroded steel surface depth of different corrosion degrees with the airport ({h Z}) model.
(3) experimental study on eccentric compression bearing capacity of corroded H steel
The 10 corroded and 2 root is not corroded Q235H steel eccentric compression test, the corrosion of H steel members under eccentric compression bearing performance degradation and mechanical properties of materials research, established the bearing capacity of corroded H steel eccentric compression column deflection calculation model and the corrosion of Q235 steel yield strength, ultimate strength and ultimate with the elongation of corrosion degree decreased with the law.
This paper aims at the tensile flange, are analyzed and discussed, the compression flange and web of corrosion of H steel members under eccentric compression bearing capacity. The results show that the corrosion of H steel flange type eccentric compression bearing capacity influence is significant and the influence of corrosion of webs, the compression flange corrosion than tensile flange bearing corrosion performance the H type steel eccentric compression is more significant.
(4) nonlinear stochastic finite element analysis of bearing performance of corroded H steel eccentric compression member
In this paper, the plane stress element and the plate bending element are used to establish the random stiffness and the overall random stiffness of the plane shell, outside the plane and its nonlinear element.
Using C++ language to prepare the corroded steel structure stochastic finite element analysis program of H type steel columns, bearing capacity were calculated and analyzed, and compared with the experimental results, the results show that the stochastic finite element analysis is the effective means of corroded steel structure bearing capacity, it can effectively simulate the corrosion of steel structure section thickness obtained random features. The corrosion of steel structure (components) statistical parameters of resistance and load effects.
(5) random resistance model and reliability analysis of corroded H steel biased member
The H type corrosion resistance steel columns, stochastic model, analysis the influence of corrosion on steel H resistance and resistance coefficient of variation of mean bias, the analysis results show that the resistance of H steel and the mean bias component decreases with the increase of corrosion degree, the resistance coefficient of variation increased with the increase of corrosion degree.
Through the reliability analysis of the corroded H steel eccentric compression member, the influence of corrosion on the reliability index of steel structure and its components is discussed. The results show that the reliability index of the structure and its components decreases with the increase of corrosion degree after corrosion of the service steel structure.

【学位授予单位】：西安建筑科技大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU392.1

【参考文献】