焊接桥梁结构的断裂驱动力分析

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The Stress Intensity Factor of Welded Bridge Structure

摘要: 对焊接桥梁结构的典型单元H型构件进行了简化分析,同时考虑了焊接残余应力的影响,估计了临界裂纹的长度,并将构件按设计应力进行了分类,计算出各类应力构件的驱动力。临界裂纹长度 2a_C=60mm;H型构件中基体的驱动力K^B_I=1.12 (α +β₁)σ_s πa_C,焊缝的驱动力K^W_I =1.12 (α +β₂)σ_s πa_C。
- 桥梁结构 /
- 应力强度因子 /
- 断裂驱动力
Abstract: A special H type component in welded steel bridge structure is semi experientially analyzed and the influence of welding residual stress is considered simultaneously. Based on the hypothesis of critical crack size and on the classification of design stress, the stress intensity factors of H type component are derived.The critical crack size of 2a_C is 60mm, the stress intensity factors of the base and welded seam in H type component are K ^B_I=1.12 (α +β₁)σ_sπa_C and K^W_I =1.12 (α +β₂)σ_s πa_C respectively.
- Bridge structure /
- Stress intensity factor /
- Fracture drive force

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[2]	Acta H,et al.The stress analysis of cracks. Heller town.Pennsylvania,1979
[3]	刘家驹,等.材料开发与应用,1992,9(2):1-6
[4]	CVDA-1989.压力容器缺陷评定规范,1989
[5]	日本焊接协会.WES2805K.按脆断评定的焊接缺陷验收标准,1976

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