波形腹板工字梁焊接残余应力研究

doi:10.3969/j.issn.1674-0696.2024.12.01

摘要/Abstract

摘要： 为研究波形腹板工字梁不同宽厚比对其焊接残余应力大小的影响和分布规律，通过数值模拟和试验方法对不同宽厚比的试件进行了研究。采用ABAQUS软件，利用完全耦合法建立了波形腹板工字梁的热弹塑性三维有限元模型，得到了焊接应力场；对不同路径位置上的焊接残余应力分布规律及不同宽厚比试件残余应力大小和分布进行分析，并绘制了分布模型；系统分析了板件厚度及宽厚比对构件残余应力的影响，并进一步探讨了构件之间的影响机制。研究结果表明：波形腹板工字梁焊接有限元模型所得结果与试验所测得的残余应力吻合度较高；残余应力总体分布主要以纵向残余应力为主，翼缘近焊缝处存在最大的残余拉应力，最大拉应力为415 MPa；在其它因素不变情况下，翼缘及腹板外伸端所出现的残余压应力大小与板件宽厚比和板件厚度变化呈反比；与此不同的是，残余拉应力大小并不直接与板件宽厚比或板件厚度呈显著的变化趋势；基于数值模拟分析，提出了波形腹板工字梁1/2截面处的残余应力分布模型和计算公式，为后续波形腹板残余应力试验提供参考。

关键词: 桥梁工程；残余应力分布模型；波形腹板工字梁；有限元分析；宽厚比；焊接试验

Abstract: In order to study the influence and distribution law of different width to thickness ratios of the corrugated web I-beam on the welding residual stress, the specimens with different width to thickness ratios were studied by numerical simulation and experiment. By using ABAQUS software and complete coupling method, a thermoelastic plastic three-dimensional finite element model of the corrugated web I-beam was established, and its welding stress field was also obtained. The distribution law of welding residual stress in different path positions and the magnitude and distribution of residual stress of the specimens with different width to thickness ratios were studied, and the distribution model was drawn. A systematic study was conducted on the influence of plate thickness and width to thickness ratio on residual stress of components, and the mechanism of influence between components was further explored. The research results show that the results obtained by the finite element model of the corrugated web I-beam welding has a good agreement with the residual stress measured by the test. The overall distribution of residual stress is mainly longitudinal residual stress, and the maximum residual tensile stress exists near the weld of the flanges, and the maximum tensile stress is 415 MPa. Under the condition that other factors remain unchanged, the residual compressive stress of flange and web overhang is inversely proportional to the change of width to thickness ratio and the thickness of plate. Unlike this, the magnitude of residual tensile stress does not directly change significantly with the width to thickness ratio or the thickness of the plate. Finally, based on the numerical simulation analysis, the residual stress distribution model and calculation formula of 1/2 section of corrugated web I-beam are proposed, which provides reference for the subsequent experimental research on residual stress of corrugated web.

Key words: bridge engineering; residual stress distribution model; corrugated web I-beam beam; finite element analysis; width to thickness ratio; welding test

中图分类号:

U446.3

闫林君，张宏，刘麒，杨继兴，王起才. 波形腹板工字梁焊接残余应力研究[J]. 重庆交通大学学报（自然科学版）, 2024, 43(12): 1-9.

YAN Linjun, ZHANG Hong, LIU Qi, YANG Jixing, WANG Qicai. Residual Stress of Welding of Corrugated Web I-Beams[J]. Journal of Chongqing Jiaotong University(Natural Science), 2024, 43(12): 1-9.

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