Design Method of Prestressed CFRP-Reinforced Purlins in Reconstruction of Photovoltaic System for Light-Gauge Steel Structure Roofs

HU Lili; FENG Peng; ZHUANG Jiangbo

doi:10.13204/j.gyjzG22102603

Volume 53 Issue 9

Sep. 2023

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2023 > 53(9): 138-148

HU Lili, FENG Peng, ZHUANG Jiangbo. Design Method of Prestressed CFRP-Reinforced Purlins in Reconstruction of Photovoltaic System for Light-Gauge Steel Structure Roofs[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(9): 138-148. doi: 10.13204/j.gyjzG22102603

Citation:

HU Lili, FENG Peng, ZHUANG Jiangbo. Design Method of Prestressed CFRP-Reinforced Purlins in Reconstruction of Photovoltaic System for Light-Gauge Steel Structure Roofs[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(9): 138-148. doi: 10.13204/j.gyjzG22102603

Citation:

HU Lili, FENG Peng, ZHUANG Jiangbo. Design Method of Prestressed CFRP-Reinforced Purlins in Reconstruction of Photovoltaic System for Light-Gauge Steel Structure Roofs[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(9): 138-148. doi: 10.13204/j.gyjzG22102603

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Design Method of Prestressed CFRP-Reinforced Purlins in Reconstruction of Photovoltaic System for Light-Gauge Steel Structure Roofs

doi: 10.13204/j.gyjzG22102603

HU Lili^1,2,
FENG Peng^{2
,
,},
ZHUANG Jiangbo³

1. Shanghai Jiao Tong University, Shanghai 200240, China;
2. Tsinghua University, Beijing 100084, China;
3. Sino-Ocean Group Holding Limited, Beijing 100025, China

Received Date: 2022-10-26
Available Online: 2023-11-08

Abstract

Abstract

Based on the engineering background of reconstruction photovoltaic systems on the light-gauge steel structure roofs of many existing industrial buildings, two categories of reinforcing techniques using prestressed CFRP laminates are applied to reinforce the purlins of such structures. The former uses hydraulic jack to prestress the CFRP laminate, which is close to the lower flange of steel purlin; and the latter uses a prestressing chair at the midspan of the steel purlin to prestress the CFRP laminate, thus the CFRP laminate is far away from the lower flange of the steel purlin and forms a triangular shape. Firstly, the reinforcement mechanisms of the two reinforcing techniques were analyzed. Secondly, based on current codes in China, the direct strength method was applied to form a calculation method of the bearing capacity and the deformation of the reinforced steel purlin, which considered the correlation between the local buckling and strength failure of the reinforced steel purlin and the increase of prestress caused by the deformation of CFRP laminate. The calculation results had good accuracy and the influencing tendencies of the parameters were obtained. It was found that using a large stiffness of CFRP, a large supporting length, and a large prestress value led to a high reinforcing efficiency. Based on this, considering the practical limitations of maximum prestress in the reinforcing stage, CFRP laminate strength and maximum deformation of the reinforced steel purlin, a design method of the reinforced steel purlin was established, and design examples of such steel purlins were given for flexural strength or local buckling enhancement. Through the comparisons of design examples, different applicable conditions of the two categories of reinforcing techniques were obtained. The technique of using prestressed CFRP with prestressing chair was easier to achieve a significant increase in flexural capacity and stiffness. This paper provided references of reinforcing steel purlins with prestressed CFRPs in real engineering.
- light-gauge steel purlin,
- carbon fiber reinforced polymer,
- buckling,
- reinforcing,
- prestress

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References(41)

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