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Stressing state analysis of multi-span continuous steel-concrete composite box girder
Highlights Study the working state characteristics of SCCBG by the theory of structural stress state analysis. Analysis of the working state parameters (strain distribution mode, deflection and crack width, etc.) reveals the abrupt change characteristics and material evolution behavior. Shear-slip curves at the interface of the combined box beam indicate the differences in the three-stage stress state. The NPI method reasonably extends the experimental strain data.
Abstract This paper uses the theory of structural stressing state to study the working characteristics of three multi-span continuous steel-concrete composite box girder (SCCBG) models with different prestress levels. Firstly, the generalized strain energy density (GSED) is constructed to reveal the working state of the structure based on the experimental strain data, the Mann-Kendall (M-K) criterion is applied to distinguish the leap characteristics load points (P and Q) of the structural stressing state and defined as the “failure load”. It is used to update the existing structural “destruction” load to more clearly reflect the entire structural failure process. Then, the working state parameters of the cross-section are described (strain distribution mode, midspan deflection, crack width, etc.) to analyze the working behavior of the box girder model. Finally, the non-sample point interpolation method (NPI) is used to reasonably expand the experimental strain data, to verify the rationality of the characteristic load points, and the stressing state characteristics of box girders with different prestressed levels are further discussed.
Stressing state analysis of multi-span continuous steel-concrete composite box girder
Highlights Study the working state characteristics of SCCBG by the theory of structural stress state analysis. Analysis of the working state parameters (strain distribution mode, deflection and crack width, etc.) reveals the abrupt change characteristics and material evolution behavior. Shear-slip curves at the interface of the combined box beam indicate the differences in the three-stage stress state. The NPI method reasonably extends the experimental strain data.
Abstract This paper uses the theory of structural stressing state to study the working characteristics of three multi-span continuous steel-concrete composite box girder (SCCBG) models with different prestress levels. Firstly, the generalized strain energy density (GSED) is constructed to reveal the working state of the structure based on the experimental strain data, the Mann-Kendall (M-K) criterion is applied to distinguish the leap characteristics load points (P and Q) of the structural stressing state and defined as the “failure load”. It is used to update the existing structural “destruction” load to more clearly reflect the entire structural failure process. Then, the working state parameters of the cross-section are described (strain distribution mode, midspan deflection, crack width, etc.) to analyze the working behavior of the box girder model. Finally, the non-sample point interpolation method (NPI) is used to reasonably expand the experimental strain data, to verify the rationality of the characteristic load points, and the stressing state characteristics of box girders with different prestressed levels are further discussed.
Stressing state analysis of multi-span continuous steel-concrete composite box girder
Xiao, Hengheng (author) / Luo, Liang (author) / Shi, Jun (author) / Jiang, Haichang (author) / Wu, Zhiwei (author)
Engineering Structures ; 246
2021-08-19
Article (Journal)
Electronic Resource
English
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