(in Polish)
W. Derkowski
Volume 529: Issue 9
Pages 118-121
Accepted for publication: 11.07.2016 r.
In the composite floors, made of hollow core elements with structural topping, interface reinforcement is not applied. In these structures preparation of the top surface of precast element has a significant impact on longitudinal shear strength. In the standards there is no consensus about the assumptions for parameters related to composite action calculations. Own experimental studies for determination of adhesion factor c and friction coefficient μ for prestressed hollow core elements commonly used in Poland are presented in the paper. Conducted tests showed that the process of longitudinal machine grooving the upper surface prefab slabs used during manufacturing, due to the relatively low profile of grooves, allows only for the classification of the contact surface, according to EC2, as a "smooth". Adoption of better parameters for longitudinal shear strength calculations should always be preceded by an analysis of surface roughness for a given type of item.
Keywords: composite action, flooring, hollow core slabs, tests, topping.
Keywords: composite action, flooring, hollow core slabs, tests, topping.
- ACI 318M-11.2011. Building Code Requirements for Structural Concrete and Comentary. Farmington Hills. American Concrete Institute.
- Ajdukiewicz Andrzej,Alina Kliszczewicz,Marek Węglorz. 2008. „Experimental study on effectiveness of interaction between pre-tensioned hollow-core slabs and concrete topping”. ACCE 1 (1): 57 ÷ 66.
- Derkowski Wit,Mateusz Kreska. 2015. „Odporność ogniowa stropów ze sprężonych płyt kanałowych z nadbetonem i bez” w Monografii: Aktualne kierunki rozwoju teorii i praktyki konstrukcji sprężonych w Polsce. Politechnika Krakowska: 79 ÷ 100.
- Derkowski Wit, Mateusz Surma. 2011. „Zespolenie w sprężonych stropach gęstożebrowych z belkami bez zbrojenia poprzecznego”.Materiały Budowlane 471 (11): 10 ÷ 14.
- Derkowski Wit, Mateusz Surma. 2015. „Composite Action of Precast Hollow Core Slabswith Structural Topping”.Czasopismo Techniczne (3-B): 15 ÷ 29.
- EN1168: 2005+A3:2011. 2011.Precast concrete products –Hollowcore slabs.
- EN 1992-1-1:2008. 2008. Eurokod 2: Design of concrete structures – Part 1-1: General rules and rules for buildings.
- fib 2000. „Special design considerations for precast prestressed hollow core floors”. fib Bulletin 6.
- fib 2012. Model Code for Concrete Structures 2010. fib Bulletin 65.
- Girhammar Ulf A., Matti Pajari. 2008. „Tests and Analysis on Shear Strength of Composite Slabs of Hollow Core Units and Concrete Topping.” Construction and Building Materials 22 (8): 1708 ÷ 1722.
- Mones Ryan M., Sergio F. Breña. 2013. „Hollow-core slabs with cast-in-place concrete toppings:Astudy of interfacial shear strength”. PCI Journal 58 (3): 124 ÷ 141.
- PN-B-03264:2002. 2002. Konstrukcje betonowe, żelbetowe i sprężone. Obliczenia statyczne i projektowanie.
- dr inż. Wit Derkowski Politechnika Krakowska,Wydział Inżynierii Lądowej
dr inż. Wit Derkowski
Full paper is available at Publisher house SIGMA-NOT Sp. z o.o. webpage