DOI QR코드

DOI QR Code

Seismic behavior of K-type eccentrically braced frames with high strength steel based on PBSD method

  • Li, Shen (School of Civil Engineering and architecture, Xi'an University of Technology) ;
  • Wang, Chao-yu (School of Civil Engineering and architecture, Xi'an University of Technology) ;
  • Li, Xiao-lei (School of Civil Engineering and architecture, Xi'an University of Technology) ;
  • Jian, Zheng (State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'an University of Technology) ;
  • Tian, Jian-bo (State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'an University of Technology)
  • Received : 2018.05.08
  • Accepted : 2018.11.19
  • Published : 2018.12.25

Abstract

In eccentrically braced steel frames (EBFs), the links are fuse members which enter inelastic phase before other structure members and dissipate the seismic energy. Based on the force-based seismic design method, damages and plastic deformations are limited to the links, and the main structure members are required tremendous sizes to ensure elastic with limited or no damage. Force-based seismic design method is very common and is found in most design codes, it is unable to determine the inelastic response of the structure and the damages of the members. Nowadays, methods of seismic design are emphasizing more on performance-based seismic design concept to have a more realistic assessment of the inelastic response of the structure. Links use ordinary steel Q345 (the nominal yielding strength $f_y{\geq}345MPa$) while other members use high strength steel (Q460 $f_y{\geq}460MPa$ or Q690 $f_y{\geq}690MPa$) in eccentrically braced frames with high strength steel combination (HSS-EBFs). The application of high strength steels brings out many advantages, including higher safety ensured by higher strength in elastic state, better economy which results from the smaller member size and structural weight as well as the corresponding welding work, and most importantly, the application of high strength steel in seismic fortification zone, which is helpful to popularize the extensive use of high strength steel. In order to comparison seismic behavior between HSS-EBFs and ordinary EBFs, on the basis of experimental study, four structures with 5, 10, 15 and 20 stories were designed by PBSD method for HSS-EBFs and ordinary EBFs. Nonlinear static and dynamic analysis is applied to all designs. The loading capacity, lateral stiffness, ductility and story drifts and failure mode under rare earthquake of the designs are compared. Analyses results indicated that HSS-EBFs have similar loading capacity with ordinary EBFs while the lateral stiffness and ductility of HSS-EBFs is lower than that of EBFs. HSS-EBFs and ordinary EBFs designed by PBSD method have the similar failure mode and story drift distribution under rare earthquake, the steel weight of HSS-EBFs is 10%-15% lower than ordinary EBFs resulting in good economic efficiency.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, China Postdoctoral Science Foundation

References

  1. AISC341-10 (2010), Seismic Provision for Structure Steel Buildings, American Institute of Steel Construction, Chicago, USA.
  2. Azad, S.K. and Topkaya, C. (2017), "A review of research on steel eccentrically braced frames", J. Constr. Steel Res., 128(1), 53-73. https://doi.org/10.1016/j.jcsr.2016.07.032
  3. Bosco, M. and Rossi, P.P. (2009), "Seismic behaviour of eccentrically braced frames", Eng. Struct., 31(3), 664-674. https://doi.org/10.1016/j.engstruct.2008.11.002
  4. Dubina, D., Stratan, A., Vulcu, C. and Ciutina, A. (2015), "High strength steel in seismic resistant building frames", Steel Constr., 7(3), 173-177. https://doi.org/10.1002/stco.201410028
  5. Engelhardt, M.D. and Popov, E.P. (2016), "Experimental performance of long links in eccentrically braced frames", J. Struct. Eng., 118(11), 3067-3088. https://doi.org/10.1061/(ASCE)0733-9445(1992)118:11(3067)
  6. FEMA356 (2000), Prestandard and Commentary for the Seismic Rehabilitation of Buildings, Federal Emergency Management Agency, Washington, DC. USA.
  7. FEMA695 (2009), Quantification of Building Seismic Performance Factors, Federal Emergency Management Agency, California, USA.
  8. Fujimoto, M., Aoyagi, T., Ukai, K., Wada, A. and Saito, K. (1972), "Structural characteristics of eccentric k-braced frames", Tran. Arch. Inst. JPN, 195(5), 39-49. (in Japanese) https://doi.org/10.3130/aijsaxx.195.0_39
  9. GB50011-2010 (2010), Code for Seismic Design of Buildings, China Architecture Industry Press, Beijing, China. (in Chinese)
  10. Hjelmstad, K.D. and Popov, E.P. (1983), "Cyclic behavior and design of link beams", J. Struct. Eng., 109(10), 2387-2403. https://doi.org/10.1061/(ASCE)0733-9445(1983)109:10(2387)
  11. Kusyilmaz, A. and Topkaya, C. (2015), "Displacement amplification factors for steel eccentrically braced frames", Earthq. Eng. Struct. Dyn., 44(2), 167-184. https://doi.org/10.1002/eqe.2463
  12. Li, S., Tian, J.B. and Liu, Y.H. (2017), "Performance-based seismic design of eccentrically braced steel frames using target drift and failure mode", Earthq. Struct., 13(5), 443-454. https://doi.org/10.12989/EAS.2017.13.5.443
  13. Lian, M. and Su, M.Z. (2017), "Seismic performance of highstrength steel fabricated eccentrically braced frame with vertical shear link", J. Constr. Steel Res., 137(10), 262-285. https://doi.org/10.1016/j.jcsr.2017.06.022
  14. Lian, M. and Su, M.Z. (2017), "Experimental study and simplified analysis of ebf fabricated with high strength steel", J. Constr. Steel Res., 139(12), 6-17. https://doi.org/10.1016/j.jcsr.2017.09.013
  15. Lian, M., Su, M.Z. and Guo, Y. (2015), "Seismic performance of eccentrically braced frames with high strength steel combination", Steel Compos. Struct., 18(6), 1517-1539. https://doi.org/10.12989/scs.2015.18.6.1517
  16. Longo, A., Montuori, R., Nastri, E. and Piluso, V. (2014), "On the use of hss in seismic-resistant structures", J. Constr. Steel Res., 103(12), 1-12. https://doi.org/10.1016/j.jcsr.2014.07.019
  17. Richards, P.W. (2004), "Cyclic stability and capacity design of steel eccentrically braced frames", Ph.D. Dissertation, Department of Structural Engineering, University Of California, San Diego.
  18. Shi, G., Hu, F. and Shi, Y.J. (2014), "Recent research advances of high strength steel structures and codification of design specification in china", Int. J. Steel Struct., 14(4), 873-887. https://doi.org/10.1007/s13296-014-1218-7
  19. Tanabashi, R., Naneta, K. and Ishida, T. (1974), "On the rigidity and ductility of steel bracing assemblage", Proceedings of the 5th World Conference on Earthquake Engineering, IAEE, Rome.
  20. Tian, X.H., Su, M.Z., Lian, M., Wang, F. and Li, S. (2018), "Seismic behavior of k-shaped eccentrically braced frames with high-strength steel: shaking table testing and FEM analysis", J. Constr. Steel Res., 143(4), 250-263. https://doi.org/10.1016/j.jcsr.2017.12.030
  21. Wang, F., Su, M.Z., Hong, M., Guo, Y. and Li, S.H. (2016), "Cyclic behaviour of y-shaped eccentrically braced frames fabricated with high-strength steel composite", J. Constr. Steel Res., 120(4), 176-187. https://doi.org/10.1016/j.jcsr.2016.01.007