Evaluation of PR steel frame connection with torsional plate and its optimal placement

Document Type : Article

Authors

1 Department of Civil Engineering, Sharif University of Technology, Azadi Ave., P.O. Box 11365 - 9313, Tehran, Iran

2 Department of Civil Engineering, Sharif University of Technology, Azadi Ave., P.O. Box 11365 - 9313, Tehran, Iran

Abstract

Characteristics of connections in steel moment-resisting frames are of utmost importance in determining the seismic performance of these structural systems. The results of several previous experimental studies have indicated that Partially-restrained (PR) connections possess excellent properties, which makes this connection a reliable substitution for Fully-restrained (FR) connections. These properties include needing less base shear, being more economic and in many cases, being able to absorb more energy. In this study, the behavior of two proposed PR connections with torsional plate is studied through finite element simulations. The results of the numerical studies regarding initial stiffness and maximum strength capacity of the proposed connections are calibrated against the results of solid mechanics formulations. Over 50 parametric studies are performed to determine the importance of various design variables of the proposed PR connections. A relation based on spring model is proposed to estimate the maximum strength capacity of the proposed connection. Seismic performance of the proposed connection is studied in a typical portal frame with various connection characteristics using nonlinear time-history analysis. The results explicitly show that using PR connections can considerably reduce the moment-rotation demands in the columns and as a result, higher performance levels can be achieved according to ASCE41.

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References

1. Moghaddam, H.A. and Estekanchi, H.E. Seismic
behavior of o -center bracing systems", J. of Constructional
Steel Research, 51(2), pp. 177-196 (1999).
2. ASCE/SEI Seismic Rehabilitation Standards Committee,
Seismic Rehabilitation of Existing Buildings
(ASCE/SEI 41-06), American Society of Civil Engineers,
Reston, VA (2007).
3. White, R.N. and Fang, P.J. Framing connections for
square structural tubing", J. of the Structural Division,
92(2), pp. 175-194 (1966).
4. Jones, M.H. Tensile and shear behavior of n-plate
connections to hollow and concrete- lled steel tubular
columns at ambient and elevated temperatures", PhD
Thesis, The University of Manchester, UK (2008).
5. Wang, Y. Robustness of connections to concrete- lled
steel tubular columns under re during heating and
cooling", PhD Thesis, The University of Manchester,
UK (2012).
6. Dawe, J. and Grondin, G. W-shape beam to RHS column
connections", Canadian J. of Civil Eng., 17(5),
pp. 788-797 (1990).
7. Elghazouli, A.Y., Malaga-Chuquitaype, C., Castro,
J.M., and Orton, A.H. Experimental monotonic and
cyclic behavior of blind-bolted angle connections",
Engineering Structures, 31(11), pp. 2540-2553 (2009).
8. Malaga-Chuquitaype, C. and Elghazouli, A. Behavior
of combined channel/angle connections to tubular
columns under monotonic and cyclic loading", Engineering
Structures, 32(6), pp. 1600-1616 (2010).
9. Li, X. Moment-rotation behavior of universal beam
to tubular column connections using reverse channel",
PhD Thesis, The University of Manchester, UK (2012).
1038 A. Moghadam et al./Scientia Iranica, Transactions A: Civil Engineering 25 (2018) 1025{1038
10. Maison, B.F., Rex, C.O., Lindsey, S.D., and Kasai, K.
Performance of PR moment frame buildings in UBC
seismic zones 3 and 4", J. of Structural Eng., 126(1),
pp. 108-116 (2000).
11. Abolmaali, A., Kukreti, A., Motahari, A., and Ghassemieh,
M. Energy dissipation characteristics of semirigid
connections", J. of Constructional Steel Research,
65(5), pp. 1187-1197 (2009).
12. Braconi, A., Salvatore, W., Tremblay, R., and Bursi,
O.S. Behavior and modelling of partial-strength
beam-to-column composite joints for seismic applications",
Earthquake Eng. & Struct. Dyn., 36(1), pp.
142-161 (2007).
13. Attarnejad, R. and Pirmoz, A. Nonlinear analysis
of damped semi-rigid frames considering momentshear
interaction of connections", Int. J. of Mechanical
Sciences, 81, pp. 165-173 (2014).
14. Brunesi, E., Nascimbene, R., and Rassati, G. Seismic
response of MRFs with partially-restrained bolted
beam-to-column connections through FE analyses",
J. of Constructional Steel Research, 107, pp. 37-49
(2015).
15. Moghadam, A. Evaluation of semi rigid steel frame
connection with torsional plate and its optimal placement",
MSc Thesis, Sharif University of Technology,
Tehran, Iran (2014).
16. Abaqus, H., Karlsson and Sorensen. Inc., Pawtucket,
RI (1989).
17. ASTM, Speci cation for Structural Steel (A36-88c),
American Society For Testing And Materials, Philadelphia
(1988).
18. Standard 2800, Iranian Code of Practice for Seismic
Resistant Design of Buildings, Third Revision, Building
and Housing Research Center, Iran (in Persian)
(2005).
19. ASCE 7-10, Minimum Design Loads for Building and
Other Structures, American Society of Civil Engineers,
ASCE, Virginia (2010).
20. AISC, Speci cation for Structural Steel Building,
ANSI/AISC 360-10, American Institute of Steel Construction,
Chicago (2010).
21. Chan, S.L. and Chui, P.T., Non-Linear Static and
Cyclic Analysis of Steel Frames with Semi-Rigid Connections,
Elsevier, Netherlands (2000).
22. Saritas, A. and Koseoglu, A. Distributed inelasticity
planar frame element with localized semi-rigid connections
for nonlinear analysis of steel structures", Int. J.
of Mechanical Sciences, 96, pp. 216-231 (2015).
23. Dogramaci Aksoylar, N., Elnashai, A.S., and Mahmoud,
H. Seismic performance of semi-rigid momentresisting
frames under far and near eld records", J.
of Struct. Eng., 138(2), pp. 157-169 (2011).
24. Mazzoni, S., McKenna, F., Scott, M.H., and Fenves,
G.L., OpenSees Command Language Manual, Paci c
Earthquake Engineering Research (PEER) Center,
Berkeley, CA (2006).
25. Wilson, E. and Habibullah, A., SAP2000, Integrated
Finite Element Analysis and Design of Structures,
Analysis Reference, Computers and Structures (1997).
26. Gupta, A. and Krawinkler, H. Seismic demands for
the performance evaluation of steel moment resisting
frame structures", PhD Thesis, Stanford University,
CA (1999).
27. Ibarra, L.F. and Krawinkler, H., Global Collapse of
Frame Structures Under Seismic Excitations, Paci c
Earthquake Engineering Research (PEER) Center,
Berkeley, CA (2005).
28. Federal Emergency Management Agency, Quanti cation
of Building Seismic Performance Factors, FEMA
P695, Washington, D.C. (2009).