[1]石广玉,李广耀.基于断裂力学的钢UHPC组合结构中栓钉的疲劳寿命评估[J].长安大学学报(自然科学版),2021,41(2):102-114.
　SHI Guang yu,LI Guang yao.Evaluation of fatigue life of stud in steelUHPC compositestructure based on fracture mechanics[J].Journal of Chang’an University (Natural Science Edition),2021,41(2):102-114.
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基于断裂力学的钢UHPC组合结构中栓钉的疲劳寿命评估()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第41卷
期数:
2021年2期
页码:
102-114
栏目:
桥梁与隧道工程
出版日期:
2021-03-15

文章信息/Info

Title:
Evaluation of fatigue life of stud in steelUHPC compositestructure based on fracture mechanics
作者:
石广玉; 李广耀
(天津大学 力学系，天津 300350)
Author(s):
SHI Guangyu;  LI Guangyao
(Department of Mechanics, Tianjin University, Tianjin 300350, China)
关键词:
桥梁工程; 栓钉疲劳寿命; 三维断裂力学分析; 焊缝表面裂纹; 钢UHPC组合桥面板; 混合型裂纹扩展模拟; SchwartzNeuman交替法
Keywords:
bridge engineering;  fatigue life of stud;  3D fracture mechanics analysis;  surface crack of stud weld joint;  steelUHPC composite bridge deck;  mixed mode crack propagation simulation;  SchwartzNeuman alternating method
文献标志码:
A
摘要:
为研究钢超高性能混凝土（UHPC）组合桥面板中焊接栓钉疲劳寿命的高效评估方法，采用SchwartzNeuman 交替法建立钢UHPC组合结构中栓钉焊缝表面裂纹的三维断裂力学模型，进行裂纹扩展模拟和栓钉的疲劳寿命预测。首先使用2种常用有限元软件ANSYS和ABAQUS中的断裂力学模型验证SchwartzNeuman交替法的计算精度和效率；然后采用SchwartzNeuman交替法求解不同栓钉焊缝初始裂纹的应力强度因子并对其进行参数分析；最后基于栓钉焊缝裂纹的三维扩展预测焊接栓钉的疲劳寿命，与钢UHPC组合结构的推出疲劳试验结果进行比对，并通过ANSYS和ABAQUS中的断裂力学分析模型以及SchwartzNeuman交替法给出的圆柱体内深埋倾斜圆形裂纹应力强度因子计算结果的比对，验证了SchwartzNeuman 交替法的优越计算能力和准确性。结果表明： 在钢UHPC组合结构的层间剪力作用下，钢UHPC组合结构的栓钉焊缝裂纹属于Ⅰ型、Ⅱ型和Ⅲ型复合的混合型裂纹，且裂纹呈非平面扩展；栓钉的疲劳破坏位置主要取决于栓钉焊缝2个焊趾处初始裂纹相对于裂纹驱动力的方位和裂纹尺寸之比；基于栓钉焊缝表面裂纹三维扩展得到的栓钉疲劳寿命预测值与推出试件疲劳试验给出的栓钉疲劳寿命实测结果吻合良好，证明基于SchwartzNeuman 交替法的表面裂纹三维扩展可高效和可靠地用于钢UHPC组合桥面板中栓钉的疲劳寿命评估。
Abstract:
In order to study the efficient fracture mechanics method for the fatigue evaluation of the stud connector in steelUHPC composite bridge deck, the 3D fracture mechanics model based on SchwartzNeuman alternating method was used to analyze the crack propagation of the surface crack of stud weld joint and predict the fatigue life of stud weld joint. Firstly, the accuracy and efficiency of SchwartzNeuman alternating method were verified by using fracture mechanics models of two commonly used finite element software ANSYS and ABAQUS. Then, the stress intensity factors (SIFs) of the initial cracks with various sizes and angles of stud welded joints were computed by the SchwartzNeuman alternating method, and the related parameters of initial crack were analyzed. Finally, based on the 3D propagation of the crack of stud welded joint, the fatigue life of stud welded joint was predicted and compared with the result of pushout test of steelUHPC composite structure. SchwartzNeuman alternating method had superior computational efficiency by comparing with the fracture mechanics models in ANSYS and ABAQUS by computing the SIFs of the deepburied inclined circular crack in cylinder. The results show that the crack of stud weld joint in steelUHPC composite structure under the interlaminar shear force of steelUHPC composite structure is mixed mode (typeⅠ+typeⅡ+typeⅢ) crack, and propagates nonplanarily during the process of crack propagation. The fatigue failure location of stud depends on the orientation of initial crack relative to crack driving force and the ratio of crack size at two weld toes of stud weld. The predicted value of the stud fatigue life computed by the 3D crack propagation of stud welded joint is in good agreement with the measured value of the stud fatigue life obtained from pushout test, which proves that the 3D propagation of surface crack based on SchwartzNeuman alternating method can be used to evaluate the fatigue life of stud in steelUHPC composite bridge deck efficiently and reliably. 5 tabs, 14 figs, 31 refs.

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更新日期/Last Update: 2021-04-02