Torsion of precast hollow core slabs

Wit Derkowski,

Mateusz Surma

Abstrakt

Pretensioned hollow core slabs are one of the most widely applied precast elements in the modern building industry all over the world. Due to the possibility of their use under various support or loading conditions, these elements repeatedly work under a complex stress state. Theoretical analysis of the phenomena of the interaction of shear and torsion in the above-mentioned HC elements is presented. The theoretical basis and design regulations of the computational model included in code PN-EN 1168+A3:2011 along with parametrical analysis of that model are demonstrated. The largest experimental research program of hollow-core slabs under shear and torsion conducted thus far is also briefly described – this study was carried out in Finland in 2004 and was the basis for the development and calibration of the numerical computational model formulated in Chalmers University of Technology in Göteborg, Sweden.

Słowa kluczowe: hollow core slab, prefabrication, pretensioned element, shear, torsion
References

[1] Broo H., Shear and Torsion in Concrete Structures. Non-Linear Finite Element Analysis in Design and Assessment, PhD Thesis, Chalmers University of Technology, Göteborg, Sweden 2008.

[2] Broo H., Lundgren K., Engstrom B., Shear and torsion interaction in prestressed hollow core units, Magazine of Concrete Research, No. 9, 2005.

[3] Broo H., Plos M., Lundgren K., Engstrom B., Simulation of shear-type cracking and failure with non-linear finite element method, Magazine of Concrete Research, No. 9, 2007.

[4] Derkowski W., Surma M., Complex Stress State in Prestressed Hollow Core Slabs, [in:] Monograph No. 478, Recent Advances in Civil Engineering: Building Structures, Cracow University of Technology, 2015, 9–28.

[5] Derkowski W., Surma M., Shear Capacity of Prestressed Hollow Core Slabs on Flexible Supports, Technical Transactions, 2-B/2013, 3–12.

[6] EN 1168:2005+A3:2011 Precast concrete products – Hollow-core slabs, 2011.

[7] EN 1992-1-1:2008 Eurokod 2: Design of concrete structures – Part 1-1: General rules and rules for buildings, 2008.

[8] fib Bulletin 65, Model Code for Concrete Structures 2010, fib, Lausanne, Switzerland 2012.

[9] Godycki-Ćwirko T., Concrete, Reinforced and Prestressed Structures, Scientific Commentary to PN-B-03264: 2002 –Chapter 9: Torsion, Warszawa 2005.

[10] Godycki-Ćwirko T., Mechanics of concrete, Arkady, Warszawa 1982 (in Polish).

[11] Pajari M., Pure torsion tests on single hollow core slabs, VTT Research Notes 2273, Finnland 2004.

[12] Pajari M., Shear-torsion interaction tests on single hollow core slabs, VTT Research Notes 2275, Finnland 2004.

[13] Pajari M., Shear-torsion tests on 200 mm hollow core floor, VTT Research Notes 2276, Finnland 2004.

[14] Pajari M., Shear-torsion tests on 400 mm hollow core floor, VTT Research Notes 2274, Finnland 2004.

[15] Seruga A., Sokal P., Skręcane elementy z betonu sprężonego w świetle wybranych badań doświadczalnych, Czasopismo Techniczne, 4-B/2012, 119–132.