Evaluation on Flexural Behavior of Hybrid Beams with Rigid Joint Connecting Steel and Precast Concrete Elements

Title & Authors
Evaluation on Flexural Behavior of Hybrid Beams with Rigid Joint Connecting Steel and Precast Concrete Elements
Seo, Eun-A; Yang, Keun-Hyeok; Hong, Seung-Hyun;

Abstract
A hybrid precast concrete beam system with a simple rigid connection was proposed to compensate the limitations and shortcomings of the conventional bolt connection associated with the H-beams embedded into concrete beams. Three beam specimens with fixed both ends were tested under one-point top cyclic loading to explore the effectiveness of the developed hybrid beam system in transferring externally applied flexure to a column. The main parameter considered was the length ($\small{L_s}$) of H-beam, which was selected to be $\small{0.25L_I}$, $\small{0.5L_I}$, and $\small{1.0L_I}$, where $\small{L_I}$ is the distance from the support to the point of inflection. All beam specimens showed a better displacement ductility ratio than the reinforced concrete beams with the same longitudinal reinforcement index, indicating that the cyclic load-deflection curve and ductility were insignificantly affected by $\small{L_s}$. The continuous strain distribution along the beam length and the prediction of the ultimate load based on the collapse mechanism ascertained the structural adequacy of the developed rigid connection.
Keywords
hybrid beam;rigid connection;ductility;collapse mechanism;
Language
Korean
Cited by
References
1.
Moon, J. H., and Oh, Y. H., "Evaluation of Design Method and Shear Transfer Capacity on the Horizontal Interface of PC Composite Beams", Journal of the Korea Concrete Institute, Vol.25, No.1, 2013, pp.81-90.

2.
Kim, O. J., Moon, J. H., and Lee, L. H., "Shear Strength of RS Hybrid Steel Beam with Reinforced Concrete Ends", Journal of Architectural Institute in Korea, Vol.17, No.5, 2001, pp.27-34.

3.
Yang, K. H., Oh, M. H., Kim, M. H., and Lee, H. C., "Flexural Behavior of Hybrid Precast Concrete Beams with H-Steel Beams at Both Ends", Engineering Structures, Vol.32, No.9, 2010, pp.2940-2949.

4.
Roeder, C. W., "Overview of Hybrid and Composite Systems for Seismic Design in the United States", Engineering Structures, Vol.20, No.4, 1998, pp.353-363.

5.
Kim, S. E., and Nguyen, H. T., "Finite Element Modeling and Analysis of a Hybrid Steel-PSC Beam Connection", Engineering Structures, Vol.32, 2010, pp.2227-2569.

6.
Yang, K. H., Evaluation of Structural Performance and Establishment of Design Guideline of HRC-2 Beams, Technical Report(KCI R 15-002), Korea Concrete Institute, 2014.

7.
KBC 2009, Korean Building Code, KBC, Architectural Institute of Korea, 2009.

8.
FEMA 356, Prestandard and Commentary for the Seismic Rehabilitation of Buildings, FEMA, Washington DC., 2000.

9.
Yang, K. H., "Evaluation of Structural Performance and Establishment of Design Guideline of HRC-2 Beams", Technical Report KCI R 15-002, Korea Concrete Institute, 2015.

10.
Sheikh, S. A., and Khoury, S. S., "A Performance-Based Approach for the Design of Confining Steel in Tied Columns", ACI Structural Journal, Vol.94, No.4, 1997, pp.421-431.

11.
Mattock, A. H., "Discussion of 'Rotational Capacity of Reinforced Concrete Beam' by W. G. Corley", Journal of the Structural Division, ASCE, Vol.94, 1967, pp.519-522.

12.
Yang, K. H., Mun, J. H., Cho, M. S., and Kang, T. H. K., "A Stress-Strain Model for Various Unconfined Concrete in Compression", ACI Structural Journal, Vol.111, No.4, 2014, pp.819-826.