Study on the Mechanical Properties of Q235 Steel Roof Trusses in Industrial Atmospheric Corrosive Environment

WANG Fenglu, HAN Tengfei, LI Yonglu, QU Yunong, ZHAO Liyong

doi:10.16577/j.issn.1001-1560.2025.0109

Materials Protection >

2025 , Vol. 58 >Issue 6: 174 - 181

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0109

Study on the Mechanical Properties of Q235 Steel Roof Trusses in Industrial Atmospheric Corrosive Environment

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(1.Central Research Institute of Building and Construction Co., Ltd., MCC, Beijing 100088, China；2.Inspection and Certification Co., Ltd., MCC, Beijing 100088, China)

WANG Fenglu (1999－),Master,Research Focus:Structural Detection and Identification,Tel.:15610125350,E-mail: smartwang＠tongji.edu.cn

Received date: 2025-01-07

Revised date: 2025-02-18

Accepted date: 2025-02-20

Online published: 2025-07-09

Supported by

Inspection and Certification Co.,Ltd.MCC Special Project(2024ZYZX14)

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Abstract

In order to investigate the impact of corrosion on the mechanical performance of steel roof truss membersin an industrial atmospheric environment, appropriate strength degradation models and indices were selected to characterize the deterioration of steel material properties.Thirty Q235B corroded steel specimens were sampled on-site from a steel slag processing plant’s roof truss system.After processing, uniaxial tensile tests were conducted on the specimens.The mechanical performance degradation model of corroded steel was theoretically analyzed based on the residual load-bearing capacity assumption, and the significance of various strength degradation models was qualitatively evaluated.An equivalent strength degradation model and a comprehensive corrosion damage parameter were chosen to represent the strength degradation caused by corrosion.Finally,based on the tensile test data,the relationship between steel strength degradation and the comprehensive corrosion damage parameter was quantitatively analyzed.Results showed that equivalent yield strength and equivalent tensile strength decreased with increasing comprehensive corrosion damage parameters, with degradation rates of 0.89 and 1.21, respectively, suggesting that as corrosion progressed, the ratio of yield to tensile strength increased, rendering the steel more susceptible to brittle failure.Additionally, the elongation diminished with increasing corrosion damage, with a degradation rate of 1.29.

Key words： industrial atmosphere; corroded steel roof trusses; residual bearing capacity; strength degradation model

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WANG Fenglu, HAN Tengfei, LI Yonglu, QU Yunong, ZHAO Liyong . Study on the Mechanical Properties of Q235 Steel Roof Trusses in Industrial Atmospheric Corrosive Environment[J]. Materials Protection, 2025 , 58(6) : 174 -181 . DOI: 10.16577/j.issn.1001-1560.2025.0109

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