波形钢板焊接连接件的疲劳试验研究及寿命评价

发布时间：2018-02-25 10:10

  本文关键词： 波形钢板 焊接连接件 疲劳试验 应力集中 疲劳寿命　出处：《建筑结构学报》2015年09期 　论文类型：期刊论文

【摘要】：通过对波形钢板焊接连接件(以下简称焊接件)的等幅疲劳加载试验和有限元分析,研究此类焊接件的应力集中特性,并对其进行寿命评价。结果表明:疲劳荷载作用下该类焊接件的破坏模式可类比于焊接波形钢腹板H形钢梁(以下简称钢梁),即发生在近波形钢腹板倾斜段终点部位焊趾处的典型疲劳破坏;波形倾斜段倾角和曲率半径与波高的比值对波形钢板平直与倾斜过渡段部位的局部应力集中影响显著,应作为设计控制参数;研究提出了将以上两参数作为变量的应力集中(即仅考虑几何应力)计算式;采用该几何应力方法可以减小波形倾斜段倾角对疲劳寿命数据离散性的影响,从而使疲劳评定简化。通过引入波形钢板焊接构造细节的应力集中系数,对不同波形倾斜段倾角情况下焊接件的疲劳寿命进行预测;将规范典型焊接接头构造细节的疲劳寿命与焊接件疲劳试验结果进行了对比。结果表明:采用AASHTO-2004规范和JSSC-1993规范对波形倾斜段倾角为45°和60°的连接细节可基本采用同一寿命评价等级;从97.7%保证率的角度考虑,波形倾斜段倾角为30°、45°和60°的连接细节可分别采用与GB 50017—2003规范对应的3类、4类、5类构件和连接,与TB10002.2—2005规范对应的Ⅲ类、Ⅶ类和Ⅷ类来评价其寿命。
[Abstract]:The stress concentration characteristics of the welded joints of corrugated steel plate (hereinafter referred to as welded parts) are studied by means of constant amplitude fatigue loading test and finite element analysis. The results show that the failure mode of this kind of welded joint under fatigue load can be compared to that of H-shaped steel beam with welded corrugated steel web (hereinafter referred to as steel beam), that is, it occurs at the end of the inclined section near the corrugated steel web. Typical fatigue failure at welding toe; The angle of inclination and the ratio of curvature radius to wave height in the inclined section of the waveform have a significant effect on the local stress concentration in the transition section between the straight and inclined sections of the corrugated steel plate, which should be used as the design control parameter. In this paper, a stress concentration formula with the above two parameters as variables is proposed, which can be used to reduce the influence of dip angle on the dispersion of fatigue life data. By introducing the stress concentration factor of the welding structure of the corrugated steel plate, the fatigue life of the welded parts with different dip angles of the waveforms is predicted. The fatigue life of typical welded joints in the code is compared with the fatigue test results of welded parts. The results show that the AASHTO-2004 code and JSSC-1993 code can be used for connecting details with dip angles of 45 掳and 60 掳. The same life evaluation grade; From the point of view of the guarantee rate of 97.7%, the details of the connection with inclination angle of 30 掳or 45 掳and 60 掳can be used to evaluate the life of the three types of components and connections corresponding to GB50017-2003, and the classes 鈪，

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