Seismic Behavior of Chevron Concentrically Braced Frames with Weak Beam

Dehghan, S.M.; Najafgholipour, M.A.; Hooshangi, H.

doi:10.24200/sci.2018.20494

Seismic Behavior of Chevron Concentrically Braced Frames with Weak Beam

Document Type : Research Article

Authors

¹ Faculty of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran

² Faculty of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, P.O. Box 71557-13876, Iran.

10.24200/sci.2018.20494

Abstract

Concentrically braced frames provide ductility and imparted seismic energy dissipation through yielding of tension braces and buckling of compression braces. In braced frames with chevron configuration, difference of actions in tension and buckled brace results in considerable unbalanced force at brace-beam intersection, which is addressed in modern seismic design provisions. In this paper, effect of flexural capacity of beam to carry this unbalanced force and consequently seismic behavior of braced frame is investigated by finite element analysis. Two-story and four-story chevron braced frames were modeled in ABAQUS software and studied by means of nonlinear cyclic pushover and nonlinear response history analysis methods. Results showed that inadequate flexural strength of the beams reduce lateral stiffness and strength of braced frame significantly as lateral drift increases; therefore, concentration of lateral deformation in one story may cause formation of soft and weak story. Furthermore, seismic behavior of chevron braced frame and two-story X braced frames were compared.

Keywords

20.1001.1.10263098.2020.27.1.4.0

Main Subjects

Mechanical Engineering

References

References:

1. ANSI, AISC "Seismic provisions for structural steel buildings (ANSI/AISC 341-10)", American Institute of Steel Construction, Chicago (IL), US (2010).
2. INBC, "INBC 10-12", Design and Construction of Steel Buildings, Tehran, Iran: Iran National Building Code (2012).
3. Robert, N. and Tremblay, R. "Seismic design and behaviour of chevron steel braced frames", In Proc. 12th World Conf. on Earthquake Engrg., Auckland, NZ (2000).
4. Rai, D.C. and Goel, S.C. "Seismic evaluation and upgrading of chevron braced frames", Journal of Constructional Steel Research, 59(8), pp. 971-994 (2003).
5. Uriz, P. and Mahin, S.A. "Seismic performance assessment of concentrically braced steel frames", In Proceedings of the 13th World Conference on Earthquake Engineering, Vancouver, Canada (2004).
6. Kim, J. and Choi, H. "Response modification factors of chevron-braced frames", Engineering Structures, 27(2), pp. 285-300 (2005).
7. Marino, E.M. and Nakashima, M. "Seismic performance and new design procedure for chevron-braced frames", Earthquake Engineering & Structural Dynamics, 35(4), pp. 433-452 (2006).
8. Dicleli, M. and Mehta, A. "Effect of near-fault ground motion and damper characteristics on the seismic performance of chevron braced steel frames", Earthquake Engineering & Structural Dynamics, 36(7), pp. 927- 948 (2007).
9. Dicleli, M. and Mehta, A. "Simulation of inelastic cyclic buckling behavior of steel box sections", Computers & Structures, 85(7), pp. 446-457 (2007).
10. Hines, E.M., Appel, M.E., and Cheever, P.J. "Collapse performance of low-ductility chevron braced steel frames in moderate seismic regions", Engineering Journal, American Institute of Steel Construction, 46(3), pp. 149-180 (2009).
11. Giugliano, M.T., Longo, A., Montuori, R., and Piluso, V. "Seismic reliability of traditional and innovative concentrically braced frames", Earthquake Engineering & Structural Dynamics, 40(13), pp. 1455-1474 (2011).
12. Tong, G.S., Luo, G.F., and Zhang, L. "Lateral resistance of chevron-braced frames with weak beams", Engineering Mechanics, 28(8), pp. 89-98 (2011).
13. Zhang, L., Luo, G.F., and Tong, G.S. "Behaviour of chevron bracing system of weak beam in resisting lateral force", Engineering Mechanics, 31(1), pp. 104- 112 (2014).
14. Hsiao, P.C., Lehman, D.E., and Roeder, C.W. "Improved analytical model for special concentrically braced frames", Journal of Constructional Steel Research, 73, pp. 80-94 (2012).
15. Hsiao, P.C. Seismic Performance Evaluation of Concentrically Braced Frames, PhD Dissertation, University of Washington (2012).
16. Lai, J.W. and Mahin, S.A. "Strongback system: A way to reduce damage concentration in steel-braced frames", Journal of Structural Engineering, 141(9), p. 04014223 (2014).
17. D'Aniello, M., Costanzo, S., and Landolfo, R. "The influence of beam stiffness on seismic response of chevron concentric bracings", Journal of Constructional Steel Research, 112, pp. 305-324 (2015).
18. Asghari, A. and Azimi, B. "Evaluation of sensitivity of CBFs for types of bracing and story numbers", Scientia Iranica, Transaction A, Civil Engineering, 24(1), p. 40 (2017).
19. Kazemzadeh Azad, S., Topkaya, C., and Astaneh-Asl, A. "Seismic behavior of concentrically braced frames designed to AISC341 and EC8 provisions", Journal of Constructional Steel Research, 133, pp. 383-404 (2017).
20. Fukuta, T., Nishiyama, I., Yamanouchi, H. and Kato, B. "Seismic performance of steel frames with inverted V braces", Journal of Structural Engineering, 115(8), pp. 2016-2028 (1989).
21. Bubela, R.K., Ventura, C.E., and Prion, H.G. "Cyclic testing of steel chevron braces with vertically slotted beam connection", IJASE, 2(1), p. 50 (2010).
22. Okazaki, T., Lignos, D.G., Hikino, T., and Kajiwara, K. "Dynamic response of a chevron concentrically braced frame", Journal of Structural Engineering, 139(4), pp. 515-525 (2012).
23. Sen, A.D., Sloat, D., Pan, L., Roeder, C.W., Lehman, D.E., and Berman, J.W. "Evaluation of the seismic performance of two-story concentrically braced frame with weak beams", In Proceedings of 5th International Conference on Advances in Experimental Structural Engineering, Taipei, Taiwan (2013).
24. Sen, A.D., Pan, L., Sloat, D., Roeder, C.W., Lehman, D.E., Berman, J.W., Tsai, K.C., Li, C.H., and Wu, A.C. "Numerical and experimental assessment of chevron braced frames with weak beams", In Proceedings 10th US National Conference of Earthquake Engineering, Anchorage, Alaska, US (2014).
25. Sen, A.D., Roeder, C.W., Berman, J.W., Lehman, D.E., Li, C.H., Wu, A.C., and Tsai, K.C. "Experimental investigation of chevron concentrically braced frames with yielding beams", Journal of Structural Engineering, 142(12), p. 04016123 (2016).
26. ANSI, AISC. "Specification for structural steel buildings ANSI/AISC 360-10)", American Institute of Steel Construction, Chicago (IL), US (2010).
27. ASCE, Minimum Design Loads for Buildings and Other Structures (ASCE 7-10), American Society of Civil Engineers, Reston (VA), US (2010).
28. www.iranhazard.mporg.ir/.
29. Shen, J., Wen, R., Akbas, B., Doran, B., and Uckan, E. "Seismic demand on brace-intersected beams in twostory X-braced frames", Engineering Structures, 76, pp. 295-312 (2014).
30. Wen, R., Seker, O., Akbas, B., and Shen, J. "Designs of special concentrically braced frame using AISC 341- 05 and AISC 341-10", Practice Periodical on Structural Design and Construction, 21(1), p. 04015011 (2015).
31. Shen, J., Wen, R., and Akbas, B. "Mechanisms in two-story X-braced frames", Journal of Constructional Steel Research, 106, pp. 258-277 (2015).