Commenced in January 2007
Paper Count: 32009
Numerical Model of Low Cost Rubber Isolators for Masonry Housing in High Seismic Regions
Abstract:Housings in developing countries have often inadequate seismic protection, particularly for masonry. People choose this type of structure since the cost and application are relatively cheap. Seismic protection of masonry remains an interesting issue among researchers. In this study, we develop a low-cost seismic isolation system for masonry using fiber reinforced elastomeric isolators. The elastomer proposed consists of few layers of rubber pads and fiber lamina, making it lower in cost comparing to the conventional isolators. We present a finite element (FE) analysis to predict the behavior of the low cost rubber isolators undergoing moderate deformations. The FE model of the elastomer involves a hyperelastic material property for the rubber pad. We adopt a Yeoh hyperelasticity model and estimate its coefficients through the available experimental data. Having the shear behavior of the elastomers, we apply that isolation system onto small masonry housing. To attach the isolators on the building, we model the shear behavior of the isolation system by means of a damped nonlinear spring model. By this attempt, the FE analysis becomes computationally inexpensive. Several ground motion data are applied to observe its sensitivity. Roof acceleration and tensile damage of walls become the parameters to evaluate the performance of the isolators. In this study, a concrete damage plasticity model is used to model masonry in the nonlinear range. This tool is available in the standard package of Abaqus FE software. Finally, the results show that the low-cost isolators proposed are capable of reducing roof acceleration and damage level of masonry housing. Through this study, we are also capable of monitoring the shear deformation of isolators during seismic motion. It is useful to determine whether the isolator is applicable. According to the results, the deformations of isolators on the benchmark one story building are relatively small.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1130579Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 976
 R. P. Nanda, M. Shrikhande, and P. Agarwal, “Low-cost base-isolation system for seismic protection of rural buildings,” Practice Periodical on Structural Design and Construction, vol. 21, no. 1, p. 04015001, 2015.
 T. Boen, Yogya Earthquake 27 May 2006: Structural Damage Report. EERI, 2006.
 J. M. Kelly, “Earthquake-resistant design with rubber,” 1993.
 A. Das, S. K. Deb, and A. Dutta, “Shake table testing of un-reinforced brick masonry building test model isolated by u-frei,” Earthquake Engineering & Structural Dynamics, vol. 45, no. 2, pp. 253–272, 2016.
 N. C. Van Engelen, P. M. Osgooei, M. J. Tait, and D. Konstantinidis, “Experimental and finite element study on the compression properties of modified rectangular fiber-reinforced elastomeric isolators (mr-freis),” Engineering Structures, vol. 74, pp. 52–64, 2014.
 A. Turer and B. O¨ zden, “Seismic base isolation using low-cost scrap tire pads (stp),” Materials and Structures, vol. 41, no. 5, pp. 891–908, 2008.
 M. Spizzuoco, A. Calabrese, and G. Serino, “Innovative low-cost recycled rubber–fiber reinforced isolator: experimental tests and finite element analyses,” Engineering Structures, vol. 76, pp. 99–111, 2014.
 H. Toopchi-Nezhad, M. J. Tait, and R. G. Drysdale, “Testing and modeling of square carbon fiber-reinforced elastomeric seismic isolators,” Structural Control and Health Monitoring, vol. 15, no. 6, pp. 876–900, 2008.
 M. Kumar, A. S. Whittaker, and M. C. Constantinou, “An advanced numerical model of elastomeric seismic isolation bearings,” Earthquake Engineering & Structural Dynamics, vol. 43, no. 13, pp. 1955–1974, 2014.
 M. Shahzad, A. Kamran, M. Z. Siddiqui, and M. Farhan, “Mechanical characterization and fe modelling of a hyperelastic material,” Materials Research, vol. 18, no. 5, pp. 918–924, 2015.
 D. Simulia, “Abaqus 6.13 users manual,” Dassault Systems, Providence, RI, 2013.
 S. Jerrams, M. Kaya, and K. Soon, “The effects of strain rate and hardness on the material constants of nitrile rubbers,” Materials & design, vol. 19, no. 4, pp. 157–167, 1998.
 A. Calabrese, M. Spizzuoco, G. Serino, G. Della Corte, and G. Maddaloni, “Shaking table investigation of a novel, low-cost, base isolation technology using recycled rubber,” Structural Control and Health Monitoring, vol. 22, no. 1, pp. 107–122, 2015.
 H. K. Mishra, A. Igarashi, and H. Matsushima, “Finite element analysis and experimental verification of the scrap tire rubber pad isolator,” Bulletin of Earthquake Engineering, pp. 1–21, 2013.
 G. Milani and F. Milani, “Stretch–stress behavior of elastomeric seismic isolators with different rubber materials: numerical insight,” Journal of Engineering Mechanics, vol. 138, no. 5, pp. 416–429, 2011.
 T. Choudhury, G. Milani, and H. B. Kaushik, “Comprehensive numerical approaches for the design and safety assessment of masonry buildings retrofitted with steel bands in developing countries: The case of india,” Construction and Building Materials, vol. 85, pp. 227–246, 2015.
 S. Tiberti, M. Acito, and G. Milani, “Comprehensive fe numerical insight into finale emilia castle behavior under 2012 emilia romagna seismic sequence: damage causes and seismic vulnerability mitigation hypothesis,” Engineering Structures, vol. 117, pp. 397–421, 2016.