Dynamic Properties of Lightweight Concrete Beams Made by Sedimentary Lightweight Aggregate
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 6
Abstract
This research aimed to investigate the engineering and dynamic properties, such as unit weight, stiffness, natural frequency and damping ratio, of lightweight aggregate concrete (LWAC) beams made with sedimentary lightweight aggregate (LWA) and to compare with companion normal weight concrete (NWC) beams. The primary design variables included compressive strengths of 20, 40, and 60 MPa and reinforcement ratios of 0%, 1.03%, and 2.32%, respectively. A total of 62 beams were made and tested. Test results showed that the unit weight of LWAC beams was about 16–23% lower than that of NWC beams for the same strength level. In addition, the reduced modulus of elasticity of LWAC resulted in a stiffness decrease of reinforced lightweight concrete (RLC) beams of 5–15% related to the reinforced NWC (RC) beams. Nevertheless, the natural frequency of RLC was still higher by about 1–10% than that of RC. In contrast, it was also found that the porous LWA with high damping capacity enhanced the damping ratio of RLC beams by 13–30% for concrete strength in the range from 20 to 60 MPa. As a whole, the lower the concrete strength is (e.g., 20 MPa), the more effective will be for the lightness of LWAC beam and the damping ratio, which in turn is more favorable to the seismic resistant efficiency of LWAC beam.
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References
Chai, Y. H., and Anderson, J. D. (2005). “Seismic response of perforated lightweight aggregate concrete wall panels for low-rise modular classrooms.” Eng. Struct., 27(4), 593–604.
Chen, H. J., Huang, C. H., and Kao, Z. Y. (2002). “Experimental investigation on steel-concrete bond in lightweight and normal weight concrete.” Struct. Eng. Mech., 17(2), 141–152.
Chopra, A. K. (2001). Dynamics of structures—Theory and applications to earthquake engineering, 2nd Ed., Prentice-Hall, Upper Saddle River, N.J.
de’Gennaro, R., Cappelletti, P., Cerri, G., de’Gennaro, M., Dondi, M., and Langella, A. (2005). “Neapolitan yellow tuff as raw material for lightweight aggregates in lightweight structural concrete production.” Appl. Clay Sci., 28(4), 309–319.
Ishibashi, T., and Okamura, H. (1997). “Study on the design earthquake resistance and degree of earthquake damage of reinforced concrete viaducts.” Cem. Concr. Compos., 19(3), 193–201.
Kim, I. H. (1998). “Evaluation system for seismic performance of RC framed structure.” Ph.D. dissertation, Univ. of Tokyo, Tokyo.
Lee, N. H., and Song, K. B. (1999). “Seismic capability evaluation of the prestressed /reinforced concrete containment, Yonggwang nuclear power plant Units 5 and 6.” Nucl. Eng. Des., 192, 189–203.
Lo, T. Y., and Cui, H. Z. (2004). “Spectrum analysis of the interfacial zone of lightweight aggregate concrete.” Mater. Lett., 58, 3089–3095.
Nuno, M. M. M., and Ju’lio, M. M. E. S. (1997). Theoretical and experimental modal analysis, Research Studies Press, U.K.
Razak, H. A., and Choi, F. C. (2001). “The effect of corrosion on the natural frequency and modal damping of reinforced concrete beams.” Eng. Struct., 23(9), 1126–1133.
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© 2010 ASCE.
History
Received: Aug 7, 2008
Accepted: Oct 18, 2009
Published online: May 14, 2010
Published in print: Jun 2010
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