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Steel and Composite Structures Volume 48, Number 1, July10 2023 , pages 59-71 DOI: https://doi.org/10.12989/scs.2023.48.1.059 |
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Effect of stud corrosion on stiffness in negative bending moment region of steel-concrete composite beam |
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Yulin Zhan, Wenfeng Huang, Shuoshuo Zhao, Junhu Shao, Dong Shen and Guoqiang Jin
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| Abstract | ||
| Corrosion of the headed studs shear connectors is an important factor in the reduction of the durability and mechanical properties of the steel-concrete composite structure. In order to study the effect of stud corrosion on the mechanical properties in the negative moment region of steel-concrete composite beams, the corrosion of stud was carried out by accelerating corrosion method with constant current. Static monotonic loading was adopted to evaluate the cracking load, interface slip, mid-span deflection, and ultimate bearing capacity of four composite beams with varying corrosion rates of headed studs. The effect of stud corrosion on the stiffness of the composite beam's hogging moment zone during normal service stage was thoroughly examined. The results indicate that the cracking load decreased by 50% as the corrosion rate of headed studs increase to 10%. Meanwhile, due to the increase of interface slip and mid-span deflection, the bending stiffness dropped significantly with the same load. In comparison to uncorroded specimens, the secant stiffness of specimens with 0.5 times ultimate load was reduced by 25.9%. However, corrosion of shear studs had no obvious effect on ultimate bending capacity. Based on the experimental results and the theory of steel-concrete interface slip, a method was developed to calculate the bending stiffness in the negative bending moment region of composite beams during normal service stage while taking corrosion of headed studs into account. The validity of the calculation method was demonstrated by data analysis. | ||
| Key Words | ||
| durability; mechanical performance; negative bending moment region; steel-concrete composite beam; stiffness; studs corrosion | ||
| Address | ||
| Yulin Zhan:1)Department of bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China 2)Institute of Civil Engineering Materials, Southwest Jiaotong University, Chengdu 610031, China Wenfeng Huang and Shuoshuo Zhao:Department of bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China Junhu Shao:School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China Dong Shen:Wenzhou Qidu Bridge North Branch Bridge Construction Co., Ltd, Wenzhou, Zhejiang 325052, China Guoqiang Jin:Bridge Science Research Institute Ltd., China Zhongtie Major Bridge Engineering Group, Wuhan, Hubei 430034, China | ||