Punching shear strength model of reinforced concrete footing considering bilinear contact stress on subgrade
•Simplified subgrade based on Winkler’s model.•Nonlinear contact stress on subgrade at the time of column footing punching shear failure.•Effect of eccentricity and column perimeter to effective depth ratio on the punching shear capacity of column footings.•New punching shear strength model that can...
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| Published in | Engineering structures Vol. 285; p. 116072 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier Ltd
15.06.2023
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| Subjects | |
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| Abstract | •Simplified subgrade based on Winkler’s model.•Nonlinear contact stress on subgrade at the time of column footing punching shear failure.•Effect of eccentricity and column perimeter to effective depth ratio on the punching shear capacity of column footings.•New punching shear strength model that can consider nonlinearity of contact stress.
The present design codes assume a linear distribution of contact stress on subgrade. Actually, the contact stress on subgrade is a nonlinear distribution. To evaluate the error caused by linear contact stress relative to nonlinear contact stress on the punching shear strength of RC footing, this paper performed punching test of footing with different eccentricity and the column perimeter to effective depth ratio, considering nonlinear contact stress on subgrade. Based on the experimental results and analysis, a bilinear contact stress distribution on subgrade is proposed. Furthermore, the calculation method based on the most unfavorable side checking is proposed to weaken the influence of the overall nonlinear contact stress. Finally, the proposed calculation method is verified for reliability and applicability based on the available experimental data. The results show that eccentricity and column perimeter to effective depth ratio significantly affect the punching shear capacity. The error caused by linear contact stress should be a concern by the codes. The bilinear contact stress distribution on subgrade is suitable for non-cohesive soil. The proposed calculation method has good reliability and applicability, and it meets the challenge posed by the nonlinear contact stress on subgrade for the assessment of column footing punching shear capacity. |
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| AbstractList | •Simplified subgrade based on Winkler’s model.•Nonlinear contact stress on subgrade at the time of column footing punching shear failure.•Effect of eccentricity and column perimeter to effective depth ratio on the punching shear capacity of column footings.•New punching shear strength model that can consider nonlinearity of contact stress.
The present design codes assume a linear distribution of contact stress on subgrade. Actually, the contact stress on subgrade is a nonlinear distribution. To evaluate the error caused by linear contact stress relative to nonlinear contact stress on the punching shear strength of RC footing, this paper performed punching test of footing with different eccentricity and the column perimeter to effective depth ratio, considering nonlinear contact stress on subgrade. Based on the experimental results and analysis, a bilinear contact stress distribution on subgrade is proposed. Furthermore, the calculation method based on the most unfavorable side checking is proposed to weaken the influence of the overall nonlinear contact stress. Finally, the proposed calculation method is verified for reliability and applicability based on the available experimental data. The results show that eccentricity and column perimeter to effective depth ratio significantly affect the punching shear capacity. The error caused by linear contact stress should be a concern by the codes. The bilinear contact stress distribution on subgrade is suitable for non-cohesive soil. The proposed calculation method has good reliability and applicability, and it meets the challenge posed by the nonlinear contact stress on subgrade for the assessment of column footing punching shear capacity. |
| ArticleNumber | 116072 |
| Author | Yi, Wei-Jian Li, Shun-Tao Li, Bo Zhang, Wang-Xi Cai, Xiang-Dong |
| Author_xml | – sequence: 1 givenname: Wang-Xi surname: Zhang fullname: Zhang, Wang-Xi organization: Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, China – sequence: 2 givenname: Xiang-Dong surname: Cai fullname: Cai, Xiang-Dong email: cxd293@hnu.edu.cn organization: College of Civil Engineering, Hunan University, Changsha 410082, China – sequence: 3 givenname: Bo surname: Li fullname: Li, Bo organization: College of Civil Engineering, Hunan University, Changsha 410082, China – sequence: 4 givenname: Shun-Tao surname: Li fullname: Li, Shun-Tao organization: College of Civil Engineering, Hunan University, Changsha 410082, China – sequence: 5 givenname: Wei-Jian surname: Yi fullname: Yi, Wei-Jian organization: College of Civil Engineering, Hunan University, Changsha 410082, China |
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| Cites_doi | 10.1002/best.202100076 10.1016/j.soildyn.2022.107255 10.25046/aj050615 10.1016/j.engstruct.2016.01.010 10.1061/(ASCE)ST.1943-541X.0003222 10.1016/j.engstruct.2016.12.064 10.1016/S0045-7949(02)00115-3 10.1002/suco.201300083 10.1016/j.engstruct.2022.113885 10.1016/j.engstruct.2019.109509 10.14359/12144 10.1016/j.engstruct.2019.109744 10.1002/suco.202100744 10.1016/j.engstruct.2006.11.012 10.1002/pse.202 10.1007/s11071-019-04977-9 |
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| Keywords | RC footing Punching shear strength Eccentricity Column perimeter to effective depth ratio Nonlinear contact stress distribution |
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| Snippet | •Simplified subgrade based on Winkler’s model.•Nonlinear contact stress on subgrade at the time of column footing punching shear failure.•Effect of... |
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| SubjectTerms | Column perimeter to effective depth ratio Eccentricity Nonlinear contact stress distribution Punching shear strength RC footing |
| Title | Punching shear strength model of reinforced concrete footing considering bilinear contact stress on subgrade |
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