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为了研究焊缝缺陷对输电钢管杆塔构件的极限承载力影响,介绍了焊接未熔合缺陷的模拟方法。对12根直缝焊管构件进行了试验分析,并与有限元计算结果进行了对比。结果表明,含有焊缝缺陷的构件极限承载力均低于无缺陷构件,并呈现随缺陷长度值增长而下降的趋势,极限荷载值降低幅度在10%以内。但达到一定缺陷长度值时,构件稳定系数将小于规范值,应引起工程设计重视。此外,焊缝缺陷沿长度方向上的扩展对承载力的降低有影响,并与构件本身长度有关,根据试验及数值模拟结果绘制了极限荷载降低比例的包络曲线,为工程应用和监测检修提供了参考依据。
In order to study the influence of weld defects on the ultimate bearing capacity of transmission tower components, the simulation method of welding unmelted defects is introduced. Experimental analysis of 12 longitudinal welded pipe members was carried out and compared with the results of finite element analysis. The results show that the ultimate bearing capacity of the member with weld defects is lower than that of the non-defect member and shows a tendency of decreasing with the increase of the defect length value. The ultimate load value decreases by less than 10%. However, when the value of certain defect length is reached, the stability coefficient of the component will be smaller than the standard value, which should arouse the attention of engineering design. In addition, the weld flaw along the length of the expansion of the impact on the reduction of bearing capacity, and the length of the component itself, according to the experimental and numerical simulation results of the ultimate load reduction ratio of the envelope curve for engineering applications and monitoring and maintenance provided The reference basis.