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Impact resistance and damage assessment of steel beams with different web openings
Huayan Chen,Jianzhong Huang,Chaojiang Fu,Sixiang Wang,Fengxuan Wang,Caisong Luo,Bizhen Wang 한국강구조학회 2024 International Journal of Steel Structures Vol.24 No.2
To investigate the impact resistance of steel beams with diff erent web openings, falling-hammer impact trials and numerical models analyses were performed, focusing on the impact energy, inter-opening space, and opening diameter. The impact resistance of steel beams with diff erent web openings was analyzed, and damage-assessment curves for web-opening steel beams (WOSBs) under impact loads were established. The results showed that web-hexagonal-opening steel beams (WHOSBs) yielded greater damage-related deformation than web-circular-opening steel beams (WCOSBs) for the same impact energy. The average maximum mid-span displacement of the WCOSBs under the falling-hammer was 86.49% that of the WHOSBs, whereas the average energy absorption rate was 6.07% higher. The WCOSBs were more resistant to impacts than the WHOSBs. The impact velocity and mass were the key damage-assessment parameters, and velocity–mass damage-assessment curves and determination equations were established according to on the WOSBs’ maximum mid-span displacement under hinge-supported restraints at both ends. Thus, this study will serve as a reference for assessing the damages of WOSBs subjected to impacts.
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Clinical Grading System, Surgical Outcomes and Prognostic Analysis of Cranial Base Chordomas
Wang, Benlin,Tian, Fengxuan,Tong, Xiaoguang The Korean Neurosurgical Society 2022 Journal of Korean neurosurgical society Vol.65 No.3
Objective : Cranial base chordomas are rare, but their treatment is challenging. Tumor recurrence is still common despite improvements in microsurgical techniques and postoperative radiotherapy. We retrospectively analyzed the course of treatment, overall survival, and recurrence/progression of chordomas over the past 10 years. Methods : We retrospectively reviewed 50 patients who underwent surgery at Tianjin Huanhu Hospital between 2010 and 2020 and were pathologically diagnosed with chordomas. Tumor resection was performed within the maximum safe range in all patients; the extent of resection was evaluated by imaging; and the incidence of complications, recurrence or progression, and overall survival were assessed. Results : Fifty patients were divided into the low-risk group (LRG) and high-risk group (HRG) based on the cranial chordoma grading system (CCGS). The Karnofsky Performance Scale scores and gross total resection rate of the LRG were significantly higher than those of the HRG (p<0.05). The incidence of complications and mortality in the LRG were lower than those of HRG. The analysis of cumulative survival and cumulative recurrence free survival/progression free survival (RFS/PFS) showed no statistical differences in the extent of resection for survival, recurrence, or progression. Univariate and multivariate analyses showed that Ki-67 was significantly associated with tumor recurrence and was an independent hazard factor (p=0.02). Conclusion : The CCGS can help neurosurgeons anticipate surgical outcomes. Pathological results are important in evaluating the possibility of tumor recurrence, and postoperative radiotherapy improves overall survival and RFS/PFS.
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Hua-Yan Chen,Fengxuan Wang,Mianyue Yang,Ai Qi,Guochan Chen,Caisong Luo,Bizhen Wang 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.1
In order to investigate the hysteretic behavior of recycled aggregate concrete with ferronickel slag-filled steel tubular (RAC-FNSFST) columns, the quasi-static loading was implemented on nine specimens with different replacement ratios (RACs), axial load levels, length–diameter ratios, and diameter–thickness ratios. The hysteretic curves, skeleton curves, deformability, energy dissipation capacity, and stiffness degeneration were studied after loading and failure mechanisms were observed, followed by the construction of FE models for parameter analysis. It is demonstrated that the hysteretic loop curve is full, and the hysteretic performance was not dramatically affected by the replacement ratio of RAC. With axial load level increase, ultimate strength at descending stage degrades quickly, stiffness degeneration accelerates, and hysteretic energy dissipation increases. Stiffness degeneration and hysteresis energy dissipation are enhanced as the length–diameter ratio increases. However, when the diameter–thickness ratio decreases, hysteretic energy dissipation increases, and stiffness degeneration accelerates. In addition, a suitable FE model was established and compared with experimental results. Then a wide range of parameter studies was carried out as a supplement to the experimental study. It is shown that the ultimate strength and ductility of specimens are intimately correlated with the RAC strength, yield strength of steel tube, slenderness ratio, axial load level, and steel ratio.
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