Issue 41

Z. Li et alii, Frattura ed Integrità Strutturale, 41 (2017) 378-387; DOI: 10.3221/IGF-ESIS.41.49 378 Residual welding stress of I-section members beyond the limits of width-thickness ratio Zhiyuan Li Chongqing Water Resources and Electric Engineering College, Yongchuan, Chongqing, 402160, China 1628607391@qq.com Zhiyun Zhao Shaanxi Architectural Design & Research Institute Co., Ltd, Xi’an, Shaanxi, 710018, China 33005652@qq.com A BSTRACT . Despite the extensive studies on the effect of width-thickness ratio and residual stress on member behavior, few scholars have probed into the residual stress distribution on the I-section members. Based on the principle of blind hole drilling, this paper conducts an experimental study of the residual welding stresses of eight welded I-shaped members. Through the analysis of the test results, the author draws the following conclusion: it is safe to use I-section members beyond the limits of width-thickness ratio because the residual stress distribution is not severely affected by width-thickness ratio. K EYWORDS . Steel structure; Residual stress; Material grade; Width-thickness ratio; principle of blind hole drilling; I-shaped members. Citation: Li, Z., Zhao, Z., Residual welding stress of I-section members beyond the limits of width-thickness ratio, Frattura ed Integrità Strutturale, 41 (2017) 378-387. Received: 14.03.2017 Accepted: 14.05.2017 Published: 01.07.2017 Copyright: © 2017 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION n many large steel structures, the flexural members are often I-shaped members with excessively high width-thickness ratio. Such members fall into the category of large welded components. After welding, residual welding stress will generate inside the components, producing welding deformation or cracks. When members are subjected to external loads, the local regional stress will grow exponentially under the combined effect of welding stress and external stress, leading to plastic deformation, cracking, and even overall fracturing [1-3]. The residual stress distribution and the size of I-shaped members vary significantly as a result of the effect of the residual stress on structural rigidity, stability, strength and stress corrosion cracking. It is therefore necessary to study the relationship between residual stress distribution and width-thickness ratio of such members. Many Chinese scholars have probed into the effect of width-thickness ratio and residual stress on member behavior. Through the analysis of I-section members, Shang Fan et al. [4] discovered that the residual stress around the weak axis is greatly influenced by the bearing capacity of the component. Huan Xinyuan et al. [5] adopted segmentation method to cut an I-section member into strips, measured the release of residual strain, and constructed a simplified model that can accurately describe the size of stainless steel I- section member and the distribution of residual stress. Qu Lihua [6] simulated the vibration mode and frequency variation I