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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。
Through the constant amplitude fatigue loading test and finite element analysis of corrugated steel plate welded joints (hereinafter referred to as welding pieces), the stress concentration characteristics of such welded pieces are studied and their lifetimes are evaluated. The results show that the failure mode of such welded parts under fatigue load can be compared with the typical H-shaped steel beam (hereinafter referred to as steel beam) of welded corrugated steel web, that is, the weld toe at the end of the inclined section of the corrugated steel web Fatigue damage; wave tilt angle and the radius of curvature and the ratio of the wave height of the corrugated plate flat and inclined transition section of the local stress concentration significant effect, should be used as the design control parameters; study put forward the above two parameters as a variable stress concentration That is, considering only geometrical stress). The geometric stress method can reduce the influence of the inclination of the waveform tilt on the dispersion of the fatigue life data, so as to simplify the fatigue assessment. By introducing the stress concentration factor of the welded steel structure, the fatigue life of the welded part under different inclination angle of the inclined section is predicted. The fatigue life of the typical welded joint is compared with the fatigue test results of the welded part. The results show that the same life evaluation grade can be basically adopted for the connection details of 45 ° and 60 ° tilt angles using the AASHTO-2004 and JSSC-1993 specifications. For the 97.7% guaranteed rate, the tilt angle of the waveform tilt is 30 The connection details of °, 45 ° and 60 ° can be respectively applied to Class 3, Class 4, Class 5 components and connections corresponding to GB 50017-2003 norms, Class III, Class VII and Class VIII corresponding to TB10002.2-2005 norms To evaluate its life.