正交异性桥面板典型焊接接头应力强度因子修正公式

发布时间：2018-02-03 04:45

本文关键词： 正交异性桥面板线弹性断裂力学焊接接头应力强度因子弯曲应力　出处：《科学技术与工程》2016年22期 　论文类型：期刊论文

【摘要】：正交异性桥面板应用广泛,其焊接接头的疲劳破坏是导致桥面板结构失效最主要的原因。采用断裂力学的方法评价正交异性桥面板典型焊接接头的疲劳性能是工程领域主要的研究方法,但已有的应力强度因子公式存在精度不高、疲劳寿命预测不准等问题。以Baik等学者提出的应力强度因子公式为基础,修正了原有公式的物理概念;并通过回归有限元模型中的数据,得到了修正的应力强度因子计算公式。经与现有试验研究结果的比较,验证了修正公式在焊接接头疲劳寿命预测上的可靠性;并证明了其在正交异性桥面板工程中的应用价值。
[Abstract]:Orthotropic bridge deck is widely used. Fatigue failure of welded joints is the main cause of bridge deck structure failure. It is the main research method in engineering field to use fracture mechanics method to evaluate fatigue performance of typical welded joints of orthotropic deck slab. However, the existing formula of stress intensity factor has some problems such as low precision and inaccurate prediction of fatigue life. Based on the formula of stress intensity factor put forward by Baik and other scholars, the physical concept of the original formula is revised. The modified formula of stress intensity factor is obtained by regressing the data of finite element model. The reliability of the modified formula in predicting fatigue life of welded joint is verified by comparing with the existing experimental results. And proved its application value in orthotropic bridge deck engineering.
【作者单位】：南京工业大学土木工程学院;
【基金】：国家自然科学基金项目(514080307)资助
【分类号】：O346.1
【正文快照】： 正交异性钢桥面板由于其具有自重轻、极限承载力大、施工速度快等优点,广泛应用于国内外大跨径桥梁中。钢桥面板结构中的各个构件通常采用焊接的方式进行连接,由于在焊接过程中难以避免的存在焊接缺陷,钢桥面板的焊接接头处极易萌生疲劳裂纹[1]。其中,位于纵肋与桥面板连接处

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