Abstract
Reliable connections between steel beam and concrete slab are important for composite beams. A new type of uplift-restricted and slip-permitted T-shape (URSP-T) connector with foamed plastic was proposed to improve mechanical performance of the hogging moment region in composite beams, i.e., to prevent concrete slab separation from the steel beam and to delay the cracking of concrete. To investigate the slip and uplift performance of URSP-T connectors, six pushout tests and three pullout tests were conducted. In pushout tests, obvious slip deformation of the URSP-T connector occurred and the foamed plastics around connectors significantly affected the slip performance. It was observed from load-deformation hysteresis curves that stiffness changed with loading history. Based on the Richard-Abbott curve, a new hysteresis model was conceptualized to simulate the slip mechanism of the connector. The predicted results correlated well with test data. In uplift tests, two types of failure modes, i.e., punching shear failure of concrete and failure of the connector’s webs, were observed. Based on test results, the relationship between uplift performance and dimensions of the connectors is discussed. Furthermore, a design formula for ultimate uplift capacity and construction details of this connector is proposed. Pushout tests and pullout tests indicated that URSP-T connectors have excellent performance. Meanwhile, finite-element analysis proved that URSP-T connectors permit larger slip deformation and reduce tensile stress inside concrete in the hogging moment region of composite beams. The investigation reported in this paper may provide a basis for design and application of URSP-T connectors.
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Acknowledgments
The writers gratefully acknowledge the financial support provided by Twelfth Five-Year Plan major projects supported by National Science and Technology (grant 2011BAJ09B01).
References
Abe, H., and Hosaka, T. (2002). “Flexible shear connectors for railway composite girder bridges.” Composite construction in steel and concrete IV, J. F. Hajjar, M. Hosain, W. S. Easterling, and B. M. Shahrooz, eds., ASCE, Reston, VA, 71–80.
Başar, Y., Itskov, M., and Eckstein, A. (2000). “Composite laminates: Nonlinear interlaminar stress analysis by multi-layer shell elements.” Comput. Methods Appl. Mech. Eng., 185(2–4), 367–397.
Gattesco, N., Giuriani, E., and Gubana, A. (1997). “Low-cycle fatigue test on stud shear connectors.” J. Struct. Eng., 145–150.
Jiang, D.-H., and Shen, J.-H. (1986). “Strength of concrete slabs in punching shear.” J. Struct. Eng., 2578–2591.
Johnson, R. P. (2004). Composite structures of steel and concrete: Beams, slabs, columns, and frames for buildings, 3rd Ed., Wiley, Hoboken, NJ.
Kraus, D., and Wurzer, O. (1997). “Nonlinear finite-element analysis of concrete dowels.” Comput. Struct., 64(5–6), 1271–1279.
Lee, P.-G., Shim, C.-S., and Chang, S.-P. (2005). “Static and fatigue behavior of large stud shear connectors for steel–concrete composite bridges.” J. Constr. Steel Res., 61(9), 1270–1285.
Liu, Y. Y., Guan, J. G., and Wang, C. Z. (1985). “Bearing strength of concrete and its failure mechanism.” J. Civ. Eng., 18(2), 53–65 (in Chinese).
Marc 2007r1 [Computer software]. Newport Beach, CA, MSC Software.
Nie, J. G., Cai, C. S., Zhou, T. R., and Li, Y. (2007). “Experimental and analytical study of prestressed steel–concrete composite beams considering slip effect.” J. Struct. Eng., 530–540.
Nie, J.-G., Wang, Y.-H., and Cai, C. S. (2012a). “Elastic rigidity of composite beams with full width slab openings.” J. Constr. Steel Res., 73(Jun), 43–54.
Nie, X., Nie, J. G., Tao, M. X., Fan, J. S., Zhang, Z. X., and Tang, H. Y. (2012b). “Study on steel-concrete continuous composite bridge connected by new type of steel-concrete connector without shear resistance.” J. Harbin Inst. Technol., 44(S1), 95–100 (in Chinese).
Ollgaard, J. G., Slutter, R. G., and Fisher, J. W. (1971). “Shear strength of stud connectors in lightweight and normal-weight concrete.” AISC Eng. J., 8(2), 55–64.
Richard, R. M., and Abbott, B. J. (1975). “Versatile elastic-plastic stress-strain formula.” J. Engrg. Mech. Div., 101(4), 511–515.
Saari, W. K., Hajjar, J. F., Schultz, A. E., and Shield, C. K. (2004). “Behavior of shear studs in steel frames with reinforced concrete infill walls.” J. Constr. Steel Res., 60(10), 1453–1480.
Shim, C.-S., Lee, P.-G., and Yoon, T.-Y. (2004). “Static behavior of large stud shear connectors.” Eng. Struct., 26(12), 1853–1860.
Slutter, R. G., and Driscoll, G. C. (1965). “Flexural strength of steel-concrete composite beams.” J. Struct. Div., 91(2), 71–99.
Taranath, B. S. (2011). Structural analysis and design of tall buildings: Steel and composite construction, CRC Press, Boca Raton, FL.
Teng, Z. M. (1987). Basic components of reinforced concrete, Tsinghua University Press, Beijing (in Chinese).
Viest, I. M. (1956). “Investigation of stud shear connectors for composite concrete and steel T-beams.” ACI J. Proc., 52(4), 875–892.
Xue, W., Ding, M., Wang, H., and Luo, Z. (2009). “Experimental studies on behavior of stud shear connectors under monotonic loads.” J. Build. Struct., 30(01), 95–100 (in Chinese).
Zheng, J. L., and Zheng, Z. Q. (1992). “Research on the test results of punching strength of reinforced concrete slabs.” J. Fuzhou Univ., 20(2), 65–71 (Natural Sciences Edition).
Zhou, F., Mosalam, K. M., and Nakashima, M. (2007). “Finite-element analysis of a composite frame under large lateral cyclic loading.” J. Struct. Eng., 1018–1026.
Zhou, X. H., Yuan, X. L., Shi, Y., Nie, S. F., and Zhao, H. J. (2012). “Research on nonlinear pinching hysteresis model of sheathed cold-formed thin-walled steel steel stud walls.” Eng. Mech., 29(6), 224–233 (in Chinese).
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© 2014 American Society of Civil Engineers.
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Received: Jan 16, 2014
Accepted: Jun 4, 2014
Published online: Jun 25, 2014
Published in print: Apr 1, 2015
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