Nonlinear analysis of lightweight aggregate concrete columns


Abstract

The paper presents a numerical analysis of deformability and load-bearing capacity of lightweight aggregate concrete (LWAC) elements subjected to bending with axial force. The nonlinear material model of LWAC presented in Eurocode 2 (EC2) was assumed. Several different densities and compressive strengths of concrete were taken into account. The investigations included the comparison of the sectional capacity and the behaviour of slender elements made with normal and lightweight aggregate concrete. It was observed that density-dependent mechanical properties of concrete affect the obtained values of the maximum axial force and the bending moment despite the same mean compressive strength. In every case, the capacity of the RLWAC section was lower than the one of normal weight, which was caused by a linear characteristic of the LWAC. Other important factors were the modulus of elasticity and the ultimate strain of concrete. LWAC with the higher density and the lower ultimate strain gave greater stiffness to slender columns but reduced the cross-sectional capacity. It was concluded that the elastic modulus and the peak strain of LWAC which are applied in columns calculations should be verified experimentally.


Keywords

lightweight aggregate concrete; columns; second-order effects

Galeota D., Giammatteo M. M., Gregori A., "Ductility and strength in high-performance, lightweight concrete columns", in 13th World Conference on Earthquake Engineering, no. 3414, 2004.

Tawfik M., Elwan S., Seleem H., and Abdelrahman A., "Behavior of lightweight concrete under uniaxial eccentric compressive stresses", International Journal of Engineering Research and Development, vol. 13, no. 9, 2017, pp. 15–27.

Tawfik M., Elwan S., Seleem H., and Abdelrahman A., "Behavior of lightweight concrete columns under eccentric loads (Parametric study)", Al-Azhar University Civil Engineering Research Magazine (CERM), vol. 40, no. 1, 2018, pp. 67–81 .

European Committee for Standardization. EN 1992-1-1, Eurocode 2: Design of concrete structures - Part 1-1 : General rules and rules for buildings, vol. 1. Brussels, 2004.

Lim J. C. and Ozbakkaloglu T., "Stress-strain model for normal- and lightweight concretes under uniaxial and triaxial compression", Construction and Building Materials, vol. 71, 2014, pp. 492–509.

Galeota D., Giammatteo M. M., Zulli M., "Structural properties of High-Performance Lightweight Concrete", in The First fib Congress 2002, 2002, pp. 247–256.

Suraneni P., Bran Anleu P. C., Flatt R. J., "Factors affecting the strength of structural lightweight aggregate concrete with and without fibres in the 1,200–1,600 kg/m3 density range", Materials and Structures, vol. 49, 2015, pp. 677–688. https://doi.org/10.1617/s11527-015-0529-2

Rossignolo A., Agnesini M. V. C., Morais J. A., "Properties of high-performance LWAC for precast structures with Brazilian lightweight aggregates", Cement & Concrete Composites, vol. 25, 2003, pp. 77–82.

Costa H., Julio E., and Lourenco J., "Lightweight Aggregate Concrete – Codes Review and Needed Corrections", in Codes in Structural Engineering. Developments and Needs for International Practice, 2010.

Zhang M.-H., Gjorv O. E., "Mechanical Properties of High-Strength Lightweight Concrete", ACI Materials Journal, no. 88, 1991, pp. 240–247.

M. D. Denavit and J. F. Hajjar, Description of geometric nonlinearity for beam-column analysis in OpenSees. Boston, 2013. http://hdl.handle.net/2047/d20003280


Published : 2020-08-11


Kołodziejczyk, E. and Waśniewski, T. (2020) “Nonlinear analysis of lightweight aggregate concrete columns”, Budownictwo i Architektura, 19(3), pp. 077-087. doi: 10.35784/bud-arch.2138.

Ewelina Kołodziejczyk  ewelina.kolodziejczyk@p.lodz.pl
Department of Concrete Structures; Faculty of Civil Engineering, Architecture and Environmental Engineering; Lodz University of Technology;  Poland
https://orcid.org/0000-0002-3533-4145
Tomasz Waśniewski 
Department of Concrete Structures; Faculty of Civil Engineering, Architecture and Environmental Engineering; Lodz University of Technology;  Poland
https://orcid.org/0000-0001-7303-4920




Creative Commons License

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Budownictwo i Architektura supports the open science program. The journal enables Open Access to their publications. Everyone can view, download and forward articles, provided that the terms of the license are respected.

Publishing of articles is possible after submitting a signed statement on the transfer of a license to the Journal.