星海湾跨海大桥锚箱疲劳性能的研究
发布时间：2019-01-20 17:16
【摘要】：本文以星海湾跨海大桥为工程背景,研究吊杆与主桁架连接结构-锚箱的疲劳性能。对锚箱进行足尺模型疲劳试验,经过200万次的循环加载后,锚箱的应力状态稳定,结构疲劳性能满足设计要求。采用有限元软件进行疲劳分析,采用VonMises等效应力作为多轴不规律应力转化为简单单轴应力的应力值；为了能够更好地模拟拉压状态,应力比采用R=-1；为了能够准确的描述延性材料的疲劳特性,平均应力修正理论采用Gerber理论。实验结果表明,应力测试值均与理论值相近且均小于理论值,且实验过程中锚箱的应力值很小,结构处于线弹性变形阶段,结构体系设计安全可靠。焊缝的疲劳性能,由于受施工工艺等的影响,采用考虑施工工艺的Sr—N曲线进行处理；结果表明此种方法能够很好地考虑制作工艺这一影响。采用雨流计数法统计疲劳应力循环次数,采用Palmgren-Mine线性损伤理论计算疲劳损伤。采用双轴受力指示系数(Biaxiality Indication)对构件在任意时程荷载作用下的受力状态进行定性判断,当系数值为0时表明结构处于单轴受力状体,当为-1时为纯剪状态,当为1时为单纯的双轴状态。分析表明锚箱焊缝从边缘向内部由纯剪状态逐步过渡为双轴受力状态。通过对结构整体受力状态定性后,能够指导今后的设计重点,可为今后锚箱设计提供参考。
[Abstract]:In this paper, the fatigue behavior of anchor box, which is the connection structure of suspender and main truss, is studied based on the sea crossing bridge of Xinghai Bay. After 2 million cycles of cyclic loading, the stress state of the anchor box is stable and the fatigue property of the structure can meet the design requirements. Fatigue analysis is carried out by finite element software, VonMises equivalent stress is used as the stress value of multiaxial irregular stress to simple uniaxial stress, in order to simulate the tension and compression state better, the stress ratio is RP-1. In order to accurately describe the fatigue characteristics of ductile materials, Gerber theory is adopted in the mean stress correction theory. The experimental results show that the measured stress values are close to the theoretical values and are smaller than the theoretical values, and the stress values of the anchor box are very small in the experimental process, the structure is in the stage of linear elastic deformation, and the structural system design is safe and reliable. The fatigue properties of weld are treated by Sr-N curve considering construction technology due to the influence of construction technology, and the results show that this method can take this effect into account. The number of fatigue stress cycles is counted by rain flow counting method and the fatigue damage is calculated by Palmgren-Mine linear damage theory. The biaxial force indication coefficient (Biaxiality Indication) is used to qualitatively judge the stress state of the member under arbitrary time-history load. When the coefficient value is 0, it indicates that the structure is in a uniaxial force form, and when -1 is a pure shear state. When 1 is a simple biaxial state. The analysis shows that the weld of the anchor box is gradually transferred from the pure shear state to the biaxial stress state from the edge to the interior. Through the qualitative analysis of the stress state of the whole structure, it can guide the design emphasis in the future and provide reference for the design of the anchor box in the future.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.4
本文编号：2412225
[Abstract]:In this paper, the fatigue behavior of anchor box, which is the connection structure of suspender and main truss, is studied based on the sea crossing bridge of Xinghai Bay. After 2 million cycles of cyclic loading, the stress state of the anchor box is stable and the fatigue property of the structure can meet the design requirements. Fatigue analysis is carried out by finite element software, VonMises equivalent stress is used as the stress value of multiaxial irregular stress to simple uniaxial stress, in order to simulate the tension and compression state better, the stress ratio is RP-1. In order to accurately describe the fatigue characteristics of ductile materials, Gerber theory is adopted in the mean stress correction theory. The experimental results show that the measured stress values are close to the theoretical values and are smaller than the theoretical values, and the stress values of the anchor box are very small in the experimental process, the structure is in the stage of linear elastic deformation, and the structural system design is safe and reliable. The fatigue properties of weld are treated by Sr-N curve considering construction technology due to the influence of construction technology, and the results show that this method can take this effect into account. The number of fatigue stress cycles is counted by rain flow counting method and the fatigue damage is calculated by Palmgren-Mine linear damage theory. The biaxial force indication coefficient (Biaxiality Indication) is used to qualitatively judge the stress state of the member under arbitrary time-history load. When the coefficient value is 0, it indicates that the structure is in a uniaxial force form, and when -1 is a pure shear state. When 1 is a simple biaxial state. The analysis shows that the weld of the anchor box is gradually transferred from the pure shear state to the biaxial stress state from the edge to the interior. Through the qualitative analysis of the stress state of the whole structure, it can guide the design emphasis in the future and provide reference for the design of the anchor box in the future.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.4
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