Experimental Testing and Finite Element Modelling of Steel Columns Weakened to Facilitate Building Demolition
- 135 Downloads
Negligible research has been conducted to date on how to analyse weakened columns, thus safety risks are still involved when structures are weakened prior to demolition. There are various methods available for demolishing steel structures. One of the most effective methods that has been developed involves pre-cutting steel columns at a certain height, so that the least effort can be used to collapse the structure by means of pulling out some of the columns. This paper presents (a) an experimental setup developed to test the capacity of axially loaded weakened columns, which is used to (b) validate a finite element (FE) model. The two pre-cuts that are presented in this paper are (1) the double window cut and (2) the triangular window cut, which are both commonly used in industry. A column weakened with a double window cut or triangular window cut reduces the axial load capacity by up to 50 and 40%, respectively. The FE models developed predict the axial failure load of weakened columns for a double window cut and triangular window cut are generally within an accuracy of less than 8 and 10%, respectively. It is shown at higher slendernesses the influence of column cuts is less than would be intuitively expected because global buckling becomes dominant.
KeywordsDemolition engineering Steel columns Failure load Abaqus Finite element analysis Collapse
This work has been supported in part by the Wilhelm Frank Foundation and the National Research Foundation of South Africa under a Thuthuka Grant, Unique Grant No. 99304. Any opinion, finding and conclusion or recommendation expressed in this material is that of the author(s) and the funders do not accept any liability in this regard.
- BSI. (2014). BS EN 1993-1-1:2005 + A1:2014—Eurocode 3: Design of steel structures—Part 1-1: General rules and rules for buildings, Eurocode 3, Amd. 1. London: British Standards Institute.Google Scholar
- Chabrolin, B. (2001). Partial safety factors for resistance of steel elements to EC3 & EC4. Calibration for various steel products and failure criteria, Final report. St-Rémy-lès-Chevreuse: Centre Technique Industriel de la Construction Métallique (CTICM).Google Scholar
- Dassault Systèmes. (2014). Abaqus analysis user’s manual. Abaqus 6.14.1. Vélizy-Villacoublay, France: Dassault Systèmes Simulia Corporation.Google Scholar
- Dassault Systèmes. (2016). Abaqus. Providence, RI: Dassault Systèmes.Google Scholar
- Dunn, T. (2015). Demolition engineering: Analysis, testing and design of weakened steel columns prior to collapse. Stellenbosch: Stellenbosch University.Google Scholar
- Estuar, F. R., & Tall, L. (1967). The testing of pinned-end columns. Tech. rep. 1683. Lehigh University Institute of Research.Google Scholar
- Galambos, T. V. (1998). Guide to stability design criteria for metal structures (5th ed.). New York: Wiley. http://books.google.com/books?hl=es&lr=&id=W_a0-8wiHdwC&pgis=1.
- HK Bldg. Dept. (2004). Code of practice for demolition of buildings. Hong Kong, PRC: Hong Kong Buildings Department.Google Scholar
- IS. (2002). IS 4130 (1991): Safety code for demolition of buildings [CED 29: Construction management including safety in construction]. New Delhi: Bureau of Indian Standards.Google Scholar
- JISF. (2015). Demolition of high-rise buildings and bridges. Steel Construction Today & Tomorrow, April(44), 7–13.Google Scholar
- Mitchell, D. (2016). Demolition engineering: Lateral load carrying capacity of weakened steel beams. Stellenbosch: Stellenbosch University.Google Scholar
- NDA. (2014). FAQs about demolition. National Demolition Association Webpage. http://www.demolitionassociation.com/demolition-faq. Accessed 1 Nov 2015.
- Roylance, D. (2006). Stress–strain curves (Vol. 3). Cambridge: Massachusetts Institute of Technology.Google Scholar
- SABS. (2005). SABS 2001:CS1 (2005)—Construction Works-Part CS1: Structural Steelwork (1st ed.). edited by South Afrucan Bureau of Standards, Pretoria.Google Scholar
- SABS. (2010). SABS 6892-1 (2010). Metallic materials-tensile testing. Part 1: Method of test at room temperature (1st ed.). Pretoria: South African Bureau of Standards.Google Scholar
- SABS. (2011). SANS 10162-1: 2011 South African National Standard the structural use of steel part 1: Limit-states design of hot-rolled steelwork. Pretoria: SABS.Google Scholar
- Smalberger, H. J. W. (2014). Comparative study of the equivalent moment factor between international steel design specifications. Stellenbosch: Stellenbosch University.Google Scholar
- Tebedge, N., Marek, P., & Tall, L. (1971). On testing methods for heavy columns. Tech. rep. 351.4. Lehigh University Institute of Research.Google Scholar
- Thi Thu Ho, C. (2010). Analysis of thermally induced forces in steel columns subjected to fires. Texas, USA: University of Texas at Austin.Google Scholar
- van Helsdingen, G. C. F. (2012). Investigation into the load capacity of weakened columns. Pretoria: University of Pretoria.Google Scholar
- van Jaarsveldt, W. J., & Walls, R. S. (2016). Predicting the failure load of steel columns weakened to facilitate demolition of a structure. In A. Zingoni (Ed.), Insights and innovations in structural engineering, mechanics and computation (pp. 1190–1195). Cape Town: Taylor & Francis.CrossRefGoogle Scholar
- Yuan, Z. (2004). Advanced analysis of steel frame structures subjected to lateral torsional buckling effects. Brisbane: Queensland University of Technology.Google Scholar