Abstract
With the development of carbon fiber reinforced composites and the continuous improvement of the properties of bonding agents, scholars recommended using carbon fiber reinforced plastics (CFRP) to enhance cold-formed thin-walled C-shaped steel structures. It can provide a fast and effective way to strengthen and repair damaged steel structures. However, discussion on the bearing capacity calculation of cold-formed thin-walled C-section steel column strengthened by CFRP was limited. Also, the relevant influencing factors (the number of CFRP reinforcement layers), the orientation of CFRP (horizontal, vertical), and the location of CFRP reinforcement (web + flanges + lips, web + flanges, web, and flanges) were overlooked in calculating the bearing capacity of cold-formed thin-walled C-section steel column strengthened by CFRP. Then, the calculation result of the load capacity will be inaccurate. This work, therefore, studied the effects of CFRP reinforcement layers, CFRP direction, and CFRP reinforcement position on the ultimate load of CFRP-strengthened cold-formed thin-walled C-section steel column. A three-dimensional (3D) finite element model of cold-formed thin-walled steel strengthened by CFRP was established to discuss the bearing capacity under axial compression. Furthermore, a method for calculating the bearing capacity of the CFRP-strengthened cold-formed thin-walled C-section steel column was proposed based on the direct strength methods (DSM). The results indicate that not only the slenderness ratio, section size, and length of members but also the number of CFRP reinforcement layers and orientation of CFRP have an impact on the calculation of bearing capacity. The equation modified in this work has excellent accuracy and adaptability. Predicting the bearing capacity of reinforced members is necessary to give full play to the performance of CFRP accurately. Thus, the methods proposed can provide a reference value for practical engineering.
Highlights
Lightweight steel structures with cold-formed thin-walled steel frames become increasingly widely used in the field of structural engineering
All the peripheral nodes of the column are constrained to these reference nodes via beam-type multiple point constraints (MPC). e reference point is defined at the shear center of the cold-formed thinwalled steel. e shear center position is determined as specified in Chinese Standard (GB50018-2002)—
Results and Discussion e results of carbon fiber reinforced plastics (CFRP)-strengthened cold-formed steel-lipped channel section simulations are always affected by various factors. e ultimate bearing capacity calculated for three types of component sizes and CFRP reinforcement positions in cold-formed thin-walled steel is first compared to experimental data from [19]. e finite element (FE) models are validated using the experimental results in [19]
Summary
Lightweight steel structures with cold-formed thin-walled steel frames become increasingly widely used in the field of structural engineering. Ereby a new set of design equations based on the direct strength method (DSM) was proposed to determine the axial compression capacity of CFRP-strengthened SHS columns subject to local buckling. Scholars compared the ultimate load of CFRPstrengthened cold-formed thin-walled steel under axial compression obtained with experimental, numerical, and direct strength methods. Erefore, this work aimed to improve upon the works of Kalavagunta et al [19], thereby proposing a new set of design equations based on the DSM to predict the axial compression capacity of CFRP-strengthened cold-formed thinwalled C-section steel columns. A 3D FE model was developed to verify the correctness of the numerical simulation and predict the ultimate bearing capacity of coldformed thin-walled C-section steel strengthened with CFRP based on the AISI-DSM. With better estimates of the utilization rate of materials, while ensuring the strength of structural components, the material can be saved, which can provide a reference for future engineering construction projects
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
