基于扩展有限元法的钢桥面横隔板弧形切口疲劳裂纹扩展特性研究

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中文摘要：为了解正变异性钢桥面板横隔板弧形切口疲劳开裂的规律,以某跨径350 m的独塔单跨钢箱梁自锚式悬索桥为背景,基于扩展有限元法建立纵肋-横隔板弧形切口多尺度裂纹扩展数值模型,求解弧形切口在轮载作用下的应力强度因子,分析轮载-热残余应力耦合作用下的疲劳裂纹扩展形态和特性.结果表明:当顺桥向车轮作用于弧形切口正上方时,应力强度因子急剧增大,基于该响应曲线可以识别疲劳荷载模型的轴组,但无法识别轴组内的单轴.弧形切口切向热残余拉应力峰值达到341.1 MPa,使得轮载作用下的压应力幅转换为拉应力幅,裂纹扩展方向与实桥疲劳裂纹的扩展形态基本吻合.由于弧形切口处于复杂的三维变形状态,以面内变形为主,因而弧形切口为Ⅰ型断裂主导的Ⅰ-Ⅱ-Ⅲ型复合裂纹扩展模式,裂纹扩展速率与应力强度因子幅均随着裂纹扩展呈现出先增大后减小的趋势.

外文标题：Research on Propagation Behaviors of Fatigue Cracks of Arc-Cutouts in Diaphragms Based on XFEM

外文摘要：This study investigates the fatigue cracking performance of arc-cutouts in diaphragms of orthotropic steel deck.An existing steel box girder self-anchored suspension bridge,which features a single tower and a single-suspended main span of 350 m,was used as a case.Multi-scale models that simulate the crack propagation behaviors of arc-cutouts of U ribs and diaphragms were built up by the extended finite element method(XFEM).The stress intensity factors of the arc-cutouts under wheel loads were calculated,and the propagation mode and characteristics of fatigue cracks under the interaction of wheel loads and thermal residual stresses were analyzed.It was found that when the wheel loads acted directly above arc-cutouts,the stress intensity factors exhibited a drastic increase,based on this response curve,the axle groups of the fatigue loading models can be identified,but single axles in each axle group can not be extracted.The peak tangential residual tensile stress in the arc-cutouts reached 341.1 MPa,forcing the compressive stress range under the wheel loads to convert to tensile stress range,and the crack propagation direction are basically consistent with the actual crack propagation mode of the real bridge.Due to that the arc-cutouts are in complex three-dimensional shape deformation state,with in-plane deformation in dominance,the arc-cutouts display the mix of Ⅰ,Ⅱ,and Ⅲ types of cracks,with theⅠ-type fracture playing a dominant role.As the cracks propagate,the cracking propagation velocity and stress intensity factor range shows the sign of from increasing to decreasing.

外文关键词：

orthotropic steel deckdiaphragmarc-cutoutfatiguecrackstress intensity factorthermal residual stressextended finite element method(XFEM)

作者：

向泽、刘力、祝志文

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作者单位：

湘西南绿色建造与智能监测湖南省普通高等学校重点实验室,湖南邵阳 422000

邵阳学院竹纤维建造材料湖南省工程研究中心,湖南邵阳 422000

中铁桥研科技有限公司,湖北武汉 430034

汕头大学土木与智慧建设工程系,广东汕头 515063

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关键词：

正交异性钢桥面板模隔板弧形切口疲劳裂纹应力强度因子热残余应力扩展有限元法

基金：

国家自然科学基金项目湖南省自然科学基金项目湖南省教育厅科学研究项目

项目编号：

522785092022JJ5003021B0684

出版年：

2024

DOI：

10.20051/j.issn.1003-4722.2024.03.007

桥梁建设

中铁大桥局集团有限公司

桥梁建设

CSTPCD北大核心

影响因子：1.428

ISSN：1003-4722

年,卷(期)：2024.54(3)

参考文献量12