桥梁拉吊索用高强不锈钢丝力学性能试验研究
发布时间：2018-11-04 11:12
【摘要】：拉吊索用钢丝的锈蚀问题一直是桥梁工程中的技术难题,特别是在以斜拉桥、悬索桥等组合体系桥被广泛使用的今天。作为该类桥型结构中的主要承重构件,拉吊索的重要性不言而喻。但是,由于环境和荷载的长期作用,再加上拉吊索始终处在高应力状态,其锈蚀和断裂问题一直是桥梁工程中的重大安全隐患。桥梁拉吊索用钢丝(钢绞线)的常规防护工艺很难从根本上解决拉吊索的锈蚀问题,而将拉吊索用高强钢丝更换为高强不锈钢丝的方法正在逐渐被业界认可。将不锈钢丝作为桥梁拉吊索制备的原材料,可以从根本上解决其锈蚀问题,从而为桥梁建设的长期健康发展提供帮助。作为桥梁拉吊索的制备原材料,不锈钢丝在满足必要不锈性、耐腐蚀性的前提下,还应具有优异的力学性能。为此,本文开展了不锈钢丝力学性能的试验研究,主要研究内容和结论如下:(1)系统总结了不锈钢丝力学性能的影响因素,包括材料的化学成份、模具和润滑条件、拉拔速率和温度、拉拔道次和面减率、预加反拉力、热处理时间和热处理温度以及退火时间等;(2)对不同拉拔道次、面减率和热处理温度的不锈钢丝进行室温拉伸试验,测出抗拉强度、屈服强度和断后延伸率等力学性能指标并进行比较,得出如下结论:随着拉拔道次的增加,不锈钢丝的抗拉强度和屈服强度增大,而断后延伸率减小;对不锈钢丝进行热处理,会提高其抗拉强度和屈服强度,而减小其断后延伸率;(3)对不锈钢丝室温拉伸试验结果的影响因素进行了分析,结果表明:随着试验机拉伸速率的增加,不锈钢丝的强度和弹性模量增大,而在断后延伸率的变化趋势方面,拉伸速率的改变未能对不锈钢丝造成规律性的影响;(4)对不锈钢丝进行轴向等幅低循环疲劳试验,多组试样的疲劳试验次数都超过了400万次,但依然存在疲劳次数未达到规范要求(200万次)的试样,说明试样的质量稳定性仍需改进;(5)对不锈钢丝进行了100h松弛性能试验,并对1000h松弛率进行了推算,得出计算机推算的1000h松弛率与线性回归分析推算值基本一致,可以反映试样的松弛性能。
[Abstract]:The problem of steel wire corrosion for slings has always been a technical problem in bridge engineering, especially in the cable-stayed bridge, suspension bridge and other composite system bridges are widely used today. As the main load-bearing member of this kind of bridge structure, the importance of the sling is self-evident. However, due to the long-term effect of environment and load, and the tension sling is always in the state of high stress, the corrosion and fracture problems have always been a major safety hazard in bridge engineering. The conventional protection technology of steel wire (steel strand) for bridge sling is very difficult to solve the problem of rust fundamentally. However, the method of replacing high strength steel wire with high strength steel wire is gradually accepted by the industry. Using stainless steel wire as the raw material of bridge sling can fundamentally solve the problem of corrosion and provide help for the long term healthy development of bridge construction. As the raw material for the preparation of bridge sling, stainless steel wire should also have excellent mechanical properties under the prerequisite of satisfying the necessary rust and corrosion resistance. The main contents and conclusions are as follows: (1) the factors affecting the mechanical properties of stainless steel wire, including the chemical composition of the material, die and lubrication conditions, are systematically summarized. Drawing rate and temperature, drawing subgrade and surface reducing rate, pretension, heat treatment time and heat treatment temperature, annealing time, etc. (2) tensile test at room temperature was carried out on stainless steel wire with different drawing passes, surface reduction rate and heat treatment temperature. Tensile strength, yield strength and elongation after break were measured and compared. The following conclusions are drawn: with the increase of drawing pass, the tensile strength and yield strength of stainless steel wire increase, while the elongation after break decreases; The tensile strength and yield strength of stainless steel wire can be increased by heat treatment, and the elongation after breaking will be reduced. (3) the factors influencing the tensile test results of stainless steel wire at room temperature are analyzed. The results show that the tensile strength and elastic modulus of stainless steel wire increase with the increase of tensile rate of the tester, but the trend of elongation after breaking increases. The change of tensile rate does not have a regular effect on stainless steel wire. (4) the fatigue test of stainless steel wire with equal amplitude and low cycle is carried out. The fatigue test times of many groups of specimens exceed 4 million, but there are still samples whose fatigue times do not meet the requirements of the specification (2 million times). It shows that the quality stability of the sample needs to be improved. (5) the 100 h relaxation test of stainless steel wire was carried out, and the 1000 h relaxation rate was calculated. It is concluded that the calculated 1000 h relaxation rate is basically consistent with the linear regression calculation value, which can reflect the relaxation property of the sample.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446
本文编号：2309652
[Abstract]:The problem of steel wire corrosion for slings has always been a technical problem in bridge engineering, especially in the cable-stayed bridge, suspension bridge and other composite system bridges are widely used today. As the main load-bearing member of this kind of bridge structure, the importance of the sling is self-evident. However, due to the long-term effect of environment and load, and the tension sling is always in the state of high stress, the corrosion and fracture problems have always been a major safety hazard in bridge engineering. The conventional protection technology of steel wire (steel strand) for bridge sling is very difficult to solve the problem of rust fundamentally. However, the method of replacing high strength steel wire with high strength steel wire is gradually accepted by the industry. Using stainless steel wire as the raw material of bridge sling can fundamentally solve the problem of corrosion and provide help for the long term healthy development of bridge construction. As the raw material for the preparation of bridge sling, stainless steel wire should also have excellent mechanical properties under the prerequisite of satisfying the necessary rust and corrosion resistance. The main contents and conclusions are as follows: (1) the factors affecting the mechanical properties of stainless steel wire, including the chemical composition of the material, die and lubrication conditions, are systematically summarized. Drawing rate and temperature, drawing subgrade and surface reducing rate, pretension, heat treatment time and heat treatment temperature, annealing time, etc. (2) tensile test at room temperature was carried out on stainless steel wire with different drawing passes, surface reduction rate and heat treatment temperature. Tensile strength, yield strength and elongation after break were measured and compared. The following conclusions are drawn: with the increase of drawing pass, the tensile strength and yield strength of stainless steel wire increase, while the elongation after break decreases; The tensile strength and yield strength of stainless steel wire can be increased by heat treatment, and the elongation after breaking will be reduced. (3) the factors influencing the tensile test results of stainless steel wire at room temperature are analyzed. The results show that the tensile strength and elastic modulus of stainless steel wire increase with the increase of tensile rate of the tester, but the trend of elongation after breaking increases. The change of tensile rate does not have a regular effect on stainless steel wire. (4) the fatigue test of stainless steel wire with equal amplitude and low cycle is carried out. The fatigue test times of many groups of specimens exceed 4 million, but there are still samples whose fatigue times do not meet the requirements of the specification (2 million times). It shows that the quality stability of the sample needs to be improved. (5) the 100 h relaxation test of stainless steel wire was carried out, and the 1000 h relaxation rate was calculated. It is concluded that the calculated 1000 h relaxation rate is basically consistent with the linear regression calculation value, which can reflect the relaxation property of the sample.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446
【引证文献】
相关会议论文 前2条
1 徐效谦;;钢丝索氏体化工艺探讨[A];第十届中国科协年会论文集（四）[C];2008年
2 尹红;叶觉明;;超大跨度悬索桥用高强钢丝和主缆制作及架设技术[A];全国金属制品信息网第22届年会论文集[C];2010年
，本文编号：2309652
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