Completely concrete encased steel I- section columns made of self-compacting concrete (SCC)

Building use

Office building

Country/Region

Poland

Overview

Steel profiles fully encased in concrete are a very common example of composite construction in infrastructures, building located in seismic-prone areas and several underwater structures, especially in China. The research stems from the need of simplifying the construction process of composite columns.

Issue and/or innovation

The study proposes to look at fully concrete-encased steel profiles as described in Eurocode 4. The variation here proposed is the use of Self compacting Concrete (SCC) instead of normally vibrated concrete.

Technical details

The research focuses on bond tests in completely concrete encased steel I- section 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 recommendation 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.

References / Technical Papers Content

Szadkowska M., Szmigiera E., “Bond between steel and SCC in completely concrete encased HEA 160 I-section columns”, Archives of Civil Engineering, Vol. LXVIII issue 3, 2022
https://doi.org/10.24425/ace.2022.141877

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Completely concrete encased steel I- section columns made of self-compacting concrete (SCC)