Enhancement of Vertical Shear Resistance in a Slim Floor Composite Section

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Helsinki University of Technology | Diplomityö
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Date

2008

Department

Rakenne- ja rakennustuotantotekniikan laitos

Major/Subject

Teräsrakennetekniikka

Mcode

Rak-83

Degree programme

Language

en

Pages

88

Series

Abstract

Deltabeam is a typical slim floor beam developed and produced by Finnish producers. This type of composite beam can be analyzed by strut-and-tie model. The vertical shear resistance of this composite beam becomes critical in some design cases; the strut force in the concrete content enclosed in the steel sections exceeds the resistance of the bottom plate. When headed studs embedded in concrete are under tension load, they transfer tension loads into based concrete by bearing surface, exploit the local tensile capacity of concrete to carry tensile stresses with a concrete cone failure mode. According to STM, the headed studs can be applied into Deltabeam and behave as tension chords to enhance the vertical shear resistance. Because of the special cross-section properties of Deltabeam, simplifications were made in the analyzing procedure. Preliminary tests were arranged to find out the real behaviours and failure loads of the single headed stud in Deltabeam-shaped concrete block. The results of this group tests fulfilled the theoretical assumptions. Based on the preliminary tests, studs were arranged into Deltabeam for beam tests. The objectives of beam tests include: 1) to investigate if the application of studs could improve the vertical shear resistance of beam; 2) to verify the extent of improved shear resistance; 3) to observe other phenomena during the tests procedure, such as bottom plate behaviour, steel web behaviour and concrete push-out. From the data got from tests, the application of studs increased the vertical shear resistance of Deltabeam. The bottom steel strips were bent due to concrete push-out, it indicates the bottoms flanges may not lost stiffness absolutely and still contribute to preventing concrete push out. As a conclusion, applying studs into Deltabeam is a reliable and economic to enhance the vertical shear resistance.

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Supervisor

Mäkeläinen, Pentti

Thesis advisor

Peltonen, Simo

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Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-2020120554396

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[dipl] Teknillinen korkeakoulu / TKK