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Jämförelsestudie för tre olika metoder att beräkna genomstansning i betong: Skillnader i genomstansningskapacitet för metoderna i BBK04, EK2 och BHB
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics, Byggteknik.
2014 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Before the European construction standards were introduced in January 2011, it was mainly the

method in BBK04 that was used for calculating punching capacity in concrete structures, and in less

common cases the method in BHB. The method of BBK04 is easy to use and have had the same

structure since the first was published in 1979. The Concrete handbook method (BHB) where usually

only used when a higher punching capacity was needed and the cross-sectional height where fixed,

calculations using this method entails more work, but will in return usually give a higher capacity. It

also allows the use of shear reinforcement to increase the cross-section capacity. The method of

calculating punching shear in EC2 differs largely from the methods of BBK04 and BHB. The method

is similar to a large extent of the so called “alternative model” to calculate the shear capacity in


The purpose of this study is to make a comparison between the different methods, mentioned above.

The study aims to find out which one of these models/methods that will provide the maximum

punching capacity and utilization. The results of the study can then be used to make a quick and fairly

assessment if a construction can withstand the same load situation that it was originally analyzed for

when using the European construction standards.

In the comparison, three different kinds of concrete qualities was used C25/35-C45/55, and four

different kinds of reinforcement contents ρ = 0.02 – 0.1%, and a span of effective cross section heights

in the range d = 0.1 - 2m.

The study shows that for an older concrete structure dimensioned in accordance with BKR and

BBK04 it’s very likely that the utilization when recalculating it with the Eurocode will not be a

problem. This seems to apply to all concrete qualities, reinforcing contents and cross-sectional heights

used in this study. The method in EC2 provides between 20-130 % higher punching capacities. The

difference between the two methods increases with the cross-sectional height. For effective heights

over 0.2 m the punching capacity is at least 36 % greater than what is obtained with method in

BBK04. The load in EC2 is in this case 16-27 % greater than the load obtained when using BKR.

Even a quite significant increase of the loads could in most cases be done.

When then concrete manual method (BHB) is used and the reinforcement content of the structure is

above 0.5 % that method generally achieves better capacities or at least equal capacities compared to

the method in EC2. For low cross-sectional heights, the method in EC2 sometimes gives better values

of capacity. It is unlikely that a structure that has been optimized with the help of BHB could

withstand the greater loads that are achieved when using the Euro codes. This also applies to crosssections that needs shear reinforcement.

Place, publisher, year, edition, pages
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-234676ISRN: UTH-INGUTB-EX-B-2014/45-SEOAI: diva2:757449
Educational program
Bachelor Programme in Construction Engineering
Available from: 2014-10-22 Created: 2014-10-22 Last updated: 2014-10-22Bibliographically approved

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