Bond between steel and SCC in completely concrete encased HEA 160 I-section columns
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Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
Submission date: 2021-10-12
Final revision date: 2022-01-11
Acceptance date: 2022-01-25
Publication date: 2022-09-30
Archives of Civil Engineering 2022;68(3):125-137
The paper presents research results of bond tests in completely concrete encased steel Isection columns made of self-compacting concrete (SCC). The results of push-out tests obtained by elements made of SCC were compared with those elements, which were made of vibrated concrete. The influence of selected factors on resistance to the vertical shear was considered in this study. The analysis of research results shows that the resistance to the vertical shear between steel I-section and SCC concrete depends on distance between stirrups and concrete age. Shrinkage has important influence on interfacial bond forces. The test results were compared with a recommendations given in the Design code – Eurocode 4. This standard can be used only for composite elements made of lightweight and vibrated concrete. In the case of completely concrete encased I-section composite columns the shear resistance after 28 days and after concrete shrinkage was higher than design resistance strength given in the standard. This means that the design value of the shear strength given in the standard should be verified and checked, if it can be applied to elements made of SCC concrete. Further tests should be carried out to determine the value of shear resistance for such elements.
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