基于有效缺口应力法的钢桥焊接细节疲劳分析

发布时间：2018-02-16 00:11

本文关键词： 钢桥焊接细节有效缺口应力名义应力疲劳评估　出处：《浙江大学学报(工学版)》2017年01期 　论文类型：期刊论文

【摘要】：为了验证有效缺口应力法对于钢桥焊接构造细节疲劳寿命评估的适用性,简化基于S-N曲线的疲劳寿命评估程序,开展3种典型钢桥焊接构造细节在应力比为0.1的条件下的高周疲劳试验.采用ABAQUS有限元分析局部有效缺口应力,得到不等厚对接焊接接头、十字形非传力角焊缝接头和十字形传力角焊缝接头疲劳试样的有效缺口应力S-N曲线,探讨局部有效缺口应力对焊接接头失效模式的影响.结果表明,焊接位错量会严重影响十字形传力角焊缝接头的失效模式,采用有效缺口应力法可以有效地区分焊根或焊趾失效;名义应力S-N疲劳设计曲线与有效缺口应力FAT225疲劳设计曲线相比,具有更高的安全保证.3种构造细节的有效疲劳试验数据表明,采用有效缺口应力FAT200疲劳设计曲线更合理.
[Abstract]:In order to verify the applicability of the effective notch stress method to the fatigue life evaluation of steel bridge welding structure details, the fatigue life evaluation program based on S-N curve is simplified. The high cycle fatigue tests of three typical steel bridges under the condition of stress ratio of 0. 1 are carried out. The local effective notch stress is analyzed by ABAQUS finite element method, and the welded joints with unequal thickness are obtained. The effective notched stress S-N curves of the fatigue specimens of cross-shaped non-force-transfer fillet welds and cross-force-transfer fillet welds are studied. The effect of local effective notch stresses on the failure modes of welded joints is discussed. The results show that, The amount of welding dislocation will seriously affect the failure mode of cross-shaped force-transfer fillet weld joint. The effective notch stress method can effectively distinguish the weld root or toe failure. Compared with the effective notch stress FAT225 fatigue design curve, the nominal stress S-N fatigue design curve is more safe than the effective notch stress FAT225 fatigue design curve. The effective fatigue test data of three kinds of structural details show that the effective notch stress FAT200 fatigue design curve is more reasonable.
【作者单位】：清华大学土木工程安全与耐久教育部重点实验室;天津大学滨海土木工程结构与安全教育部重点实验室;
【基金】：国家自然科学基金资助项目(51378289;51678339) 高等学校博士学科点专项科研基金资助项目(20130002110085)
【分类号】：U445.583

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