Simulation of Seismic Load Resistance of Core-Walls for Tall Buildings

Abstract:

This paper addresses the seismic performance of core-walls based on an experiment and numerical analysis on two 1/7.5 scaled L-shaped concrete core-wall specimens. Concrete strength was 77 MPa and the yield strength of vertical reinforcement was over 700MPa. Test variable was the loading path on the axial load – lateral load relation. Axial load was varied as high as 6MN or 50% of the axial load capacity for one specimen and 4.2MN or 35% for the other specimen as a linear function of the lateral load. The lateral load-drift relations were recorded with local deformation and damage, focusing on the yield of reinforcement and crushing of concrete. Damage of columns was severe and indicated the importance of good confinement at this region for better seismic performance. The numerical models with finite shell elements well simulated the intensity and extent of damage in addition to backbone curves of lateral load - drift angle relations when the pullout of longitudinal reinforcement of columns is considered.

• Periodical: Applied Mechanics and Materials (Volume 82)
• Pages: 386-391
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.82.386
• Online since: July 2011
• Authors: Susumu Kono, Kohei Sakamoto, Masanobu Sakashita
• Keywords: Axial Force Variation, Bond, Confined Region, Confinement, L-Shaped Core Walls

References

[1] Adebar, P., Ibrahim, A. M. M., and Bryson, M.: Test of High-Rise Core Wall: Effective Stiffness for Seismic Analysis, ACI Structural Journal, V. 104, No. 5, pp.549-559. (2007)

DOI: 10.14359/18857

[2] H. Kumagai, H., Tozawa, M., and Kuruse, Y.: Study on 3-dimensional RC Structural Wall Under Flexural Compression, Journal of Japan Concrete Institute, V.16, No. 3, pp.59-68. (in Japanese) (2005)

[3] Funaki, H. et al.: Experimental Study on Structural Performance of RC Shear Walls with L Shaped Section, Summaries of technical papers of Annual Meeting Architectural Institute of Japan, C-2, Structures IV, pp.699-704. (in Japanese) (2007)

[4] Konishi, S., Maruta, M., Suzuki, N., and Besho, S.:Experimental Study on RC L-shaped Core Structural Wall, Proceedings of the Japan Concrete Institute, V.19, No.2, pp.1083-1088. (in Japanese) (1997)

[5] Maruta, M., Suzuki, N., and Besho, S.: Structural capacities of open-section r/c core walls, Journal of Structural and Construction Engineering, Architectural Institute of Japan, pp.109-116. (in Japanese) (1999)

[6] Nakachi, T.: FEM Analysis of Reinforced Concrete Core Walls, Proceedings of the Japan Concrete Institute, V. 19, No. 3, pp.319-324. (in Japanese) (2007)

[7] Fafitis, A. and Shah, S.P.: Lateral Reinforcement for High-Strength Concrete Columns, ACI SP-87, pp.213-232. (1985)

[8] Sun, Y. P. and Sakino K.: Ductility Improvment of Reinforced Concrete Column with High Strength Materials, Proceedings of the Japan Concrete Institute, Vol. 15， No. 2， pp.719-724, 1993. (In Japanese) (1993)

[9] Al-Mahidi R.S.H.: Nonlinear FEM analysis of RC deep members, Report 79-1, Department of Structural Engineering, Cornell University. (1979)