Mechanical Performance of Box Section Steel Beams under Damaged Conditions based on Finite Element Analysis
This study systematically investigates the degradation patterns of mechanical performance in box-section steel beams under damaged conditions using finite element analysis. A refined finite element model was developed on the ABAQUS platform, incorporating material nonlinearity, geometric nonlinearity, initial imperfections, and residual strains. Damage scenarios were simulated through a material reassignment approach. Particular emphasis was placed on examining the influence of flange width, section height, and beam span on the load-bearing capacity of the steel beams. The results indicate that structural damage leads to stress redistribution, reduces the ultimate load-carrying capacity, and may trigger local instability or brittle fracture. Increasing the flange width or section height enhances the ultimate load-bearing capacity of damaged box-section steel beams, whereas an increase in beam span results in a decline in their load-carrying capacity. These findings provide a theoretical basis for the safety evaluation and retrofit design of existing steel structures.
References
- Bu Liangtao, Gao Wei. Analysis of Engineering Accidents and Countermeasures [M]. Changsha: Central South University Press, 2005.
- Xu Qiang. Seismic Performance Evaluation of Steel Frame Structures with Existing and Improved Node Forms [D]. Xi'an University of Architecture and Technology, 2014.
- Shang Meijun. Current Status and Development of Building Steel Structures in China [J]. Talent, 2015, (30): 339.
- Beg D, Hladnik L. Slenderness limit of class 3: I cross-sections made of high-strength steel [J]. Journal of Constructional Steel Research, 1996, 38(3): 201-217.
- Sause Richard, Fahnestock Larry A. Strength and Ductility of HPS100W I-Girders in Negative Flexure [J]. Journal of Bridge Engineering, 2001, 6(5): 316-323.
- Zhou Xuhong, Guan Yu, Gao Tingting, et al. Study on the Flexural Behavior of Double-Limb Cold-Formed Thin-Walled Steel I-Beams with Combined Sections [J]. China Civil Engineering Journal, 2016, 49(08): 16-27+52.
- Ye Liming. Experimental Study on the Flexural Behavior of Steel Beams Strengthened with CFRP Plates [D]. Guangxi University of Technology, 2011.
- Nakai T, Matsushita H, Yamamoto N. Effect of pitting corrosion on strength of web plates subjected to patch loading [J]. *Thin-Walled Structures*, 2006, 44(1): 10-19.
- Wang Zhihan, Zhang Baojun, Yang Yiting, et al. Study on the Influence of Static Strain Aging on the Mechanical Properties of Damaged H-Section Steel Beams [J]. Steel Construction (Chinese & English), 2024, 39(08): 1-10.
- Yin Chao. Study on the Influence of Pitting Corrosion on the Mechanical Properties of Steel Box Beams [D]. Jiangsu University of Science and Technology, 2017.
- Xiang Yuxuan. Experimental Study on the Mechanical Properties of Damaged Steel Beams and Columns [D]. Central South University of Forestry and Technology, 2017.
- Gorl E, Link M. Damage identification using changes of eigenfrequencies and mode shapes [J]. Mechanical Systems and Signal Processing, 2003, 17(1): 103-110.
- Shen Zuyan, Shen Su. Seismic Analysis of High-Rise Steel Structures Considering Cumulative Damage and Crack Effects [J]. Journal of Tongji University, 2002, 30(4): 393-398.
- Zhou Taiquan. Analysis of Local Hot Spot Stresses in Bridge Components and Simulation of Fatigue Damage Accumulation Process [D]. Southeast University, 2003.
- Zhao Yuan, Lu Qiuhai. Detection Methods for Multiple Locations of Damage in Simply Supported Beam Bridges [J]. Journal of Tsinghua University (Natural Science Edition), 2002, 42(4): 434-438.