Bulletin of Earthquake Science and Engineering

Bulletin of Earthquake Science and Engineering

Cyclic Behavior of the New Self-Centering Buckling Restrained Brace (Experimental Approach)

Document Type : Research Article

Authors
1 Ph.D. Candidate, Faculty of Civil and Environmental Engineering, Tarbiat Modares Univ., Tehran, Iran
2 Professor, Dept. of Structural Engineering, Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
Abstract
To mitigate the input energy of the earthquake, numerous vibration control systems have been broadly proposed. The vibration control system can be categorized as passive, active, semi-active, and hybrid. The metallic dampers as a passive vibration control system because of their simple construction and configuration, low cost, availability, high efficiency, rate-independent, resistance to ambient temperature, and require no external energy, are an appropriate and economical control system in structures to mitigate the input energy of the earthquake. Metallic dampers can control the system and absorb the input energy of the earthquake through a shear, flexural, axial, and torsional capacity of the metal element. Different configurations of the metallic damper have been proposed. One of the energy-absorbing mechanisms of the metallic damper is using axial capacity. This paper proposed a new type of buckling restrained brace. Energy Dissipating elements of this damper withstand applied force through the compressive strength of the core plates in each cycle. The proposed damper consists of four comb-teeth elements instead of one consistent element. Each comb-teeth element with a rectangular section of 20×8 mm consists of three narrow straps with different lengths of 390, 386 and 382 mm to make a jump in the hysteric response curve by making lag in the formation of the buckling mode shapes. These comb-teeth elements were welded to two positions on both sides of the middle plate. The middle plate’s height, width, and thickness are 500, 400 and 30 mm, respectively. The proposed damper carried out the axial load through the displacement of this plate. Twelve restraining elements with a section of 30×20 mm and a length of 830 mm were used to prevent global buckling of each strap of the comb-teeth damper. For this purpose, twelve grooves have been created on the middle plate and the restraining members passed through it. Also, to prevent the residual displacement of the system, six parallel springs with an equivalent stiffness of 2316 N/mm were used as a self-centering system on each side of the middle plate. By applying force to the middle plate, the pre-compressive springs provide self-centering force and bring the middle plate to the initial position. Finally, two end plates as reaction plates with a section of 300×200 mm and a thickness of 20 mm were bolted to the cross-section of the restraining members by using 10 mm high-strength grade 12.9 bolts. The springs are placed inside the pipes and between the middle plate and end plate. Both ends of the springs stay free. Also, to prevent the lateral displacement of the restraining members perpendicular to the length of the straps, 48 batten plates were used. These batten plates were bolted by using 8 mm high-strength grade 12.9 bolts at two positions from each end of the restraining members. The whole length of the proposed damper is 870 mm. The 1000kN-capacity servo-controlled hydraulic jack was used to experimentally determine the hysteretic behavior of the proposed damper. Experimental results indicate that the proposed system experienced the maximum axial load of 348.6 kN and -347.6 kN in the back-and-forth direction of applied load at the same axial displacement of 35 mm. The results show that the damper experienced a residual displacement of 10.9 and -11.4 mm at the end of the test, so using springs eliminates the residual displacement up to 68.8% and 67.4%, respectively. Also, to evaluate the performance of the proposed system, energy absorbing capacity and the equivalent viscous damping coefficient were calculated 35.25 kJ and 46% based on the load-displacement curve, respectively. As expected, the failure modes of the core plates of the proposed damper concentrated on buckling modes in the weak and strong axes. It is worth noting that all the systems exhibited satisfactory performance without any instability during the test.
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Aghani, H., Cheraghi, K., & Bakhshipour, M. (2024). Numerical investigation of the effect of aluminum yielding damper for the retrofitting of semi-rigid steel frames. Periodica Polytechnica Civil Engineering, 68(2), 349-357.
ASTM (2009). Standard Test Methods for Tension Testing of Metallic Materials. ASTM E8/E8M-09.
AISC (2022). Seismic Provisions for Structural Steel Buildings. ANSI/AISC 341-22. An American National Standard. American Institute of Steel Construction.
AISC (2022). Specification for Structural Steel Buildings. ANSI/AISC 360-22. An American National Standard. American Institute of Steel Construction.
ATC (1992). Guidelines for Cyclic Seismic Testing of Components of Steel Structures. Applied Technology Council.
Benavent-Climent, A., Morillas, L., & Vico, J.M. (2011). A study on using wide‐flange section web under out-of-plane flexure for passive energy dissipation. Earthquake Engineering & Structural Dynamics, 40(5), 473-490.
Christopoulos, C., Tremblay, R., Kim, H.-J., & Lacerte, M. (2008). Self-centering energy dissipative bracing system for the seismic resistance of structures: development and validation. Journal of Structural Engineering, 134(1), 96-107.
Dong, H., Du, X., Han, Q., Hao, H., Bi, K., & Wang, X. (2017). Performance of an Innovative self-centering buckling restrained brace for mitigating seismic responses of bridge structures with double-column piers. Engineering Structures, 148, 47-62.
Federal Emergency Manegement (2000). Prestandard and Commentary for the Seismic Rehabilitation of Buildings, FEMA356, Washington, D.C.
Fujimoto, M., Wada, A., & Saeki, E. (1990). Development of unbonded brace. Quarterly Column, 115, 91-96.
Garivani, S., Aghakouchak, A., & Shahbeyk, S. (2016). Numerical and experimental study of comb-teeth metallic yielding dampers. International Journal of Steel Structures, 16, 177-196.
Ghowsi, A.F., Faqiri, A., & Sahoo, D.R. (2019). 'Numerical Study on Cyclic Response of Self-Centering Steel Buckling-Restrained Braces'. In: Rao, A., Ramanjaneyulu, K., (eds) Recent Advances in Structural Engineering, Vol 1. Lecture Notes in Civil Engineering, Vol. 11.
Grossi, E., Aprile, A., Zerbin, M., & Livieri, P.    (2024). Preliminary experimental tests of a novel friction damper for seismic retrofit of RC precast structures. Engineering Structures, 305, 117718.
Hoveidae, N., Tremblay, R., Rafezy, B., & Davaran, A. (2015). Numerical investigation of seismic behavior of short-core all-steel buckling restrained braces. Journal of Constructional Steel Research, 114, 89-99.
Issa, A.S., & Alam, M.S. (2019). Seismic performance of a novel single and double spring-based piston bracing. Journal of Structural Engineering, 145(2), 04018261.
Maleki, S., & Mahjoubi, S. (2013). Dual-pipe damper. Journal of Constructional Steel Research, 85, 81-91.
Miller, D.J., Fahnestock, L.A., & Eatherton, M.R. (2011). Self-Centering Buckling-Restrained Braces for Advanced Seismic Performance. Structures Congress, Las Vegas, United States.
Miller, D.J., Fahnestock, L.A., & Eatherton, M.R. (2012). Development and experimental validation of a nickel–titanium shape memory alloy self-centering buckling-restrained brace. Engineering Structures, 40, 288-298.
Oinam, R.M., & Sahoo, D.R. (2015). Enhancement of Lateral Capacity of Damaged Non-Ductile RC Frame Using Combined-Yielding Metallic Damper. Advances in Structural Engineering: Materials, 3.
Pandikkadavath, M.S., & Sahoo, D.R. (2016). Cyclic testing of short-length buckling-restrained braces with detachable casings. Earthquakes and Structures, 10(3), 699-716.
Piedrafita, D., Cahis, X., Simon, E., & Comas, J. (2015). A new perforated core buckling restrained brace. Engineering Structures, 85, 118-126.
Rahimi, H., Esfandari, J., & TahamouliRoudsari, M. (2024). Experimental and numerical assessment of the seismic behavior of non-uniform slit dampers and bar dampers in moment resisting reinforced concrete frames. Periodica Polytechnica Civil Engineering, 68(1), 314-324.
Shang, C., Zhou, Y., Shi, F., Li, J., & Jiang, K. (2024). Investigation on mechanical behavior of shear panel damper under bidirectional loading. Journal of Constructional Steel Research, 216, 108580.
Wu, A.C., Lin, P.C., & Tsai, K.C. (2014). High-mode buckling responses of buckling-restrained brace core plates. Earthquake Engineering & Structural Dynamics, 43(3), 375-393.
Wu, J., & Phillips, B.M. (2017). Passive self-centering hysteretic damping brace based on the elastic buckling mode jump mechanism of a capped column. Engineering Structures, 134, 276-288.
Yazdani, M., Tasnimi, A.A., (2024). Investigating the cyclic behavior of the new self-centering buckling restrained brace. 9th International Conference on Seismology and Earthquake Engineering (SEE9), Tehran, Iran (in Persian).
Zhai, Z., Liu, Y., Mercan, O., Zou, S., & Zhou, F. (2024). A hybrid buckling-restrained brace for enhancing the seismic performance of steel moment resisting frames. Soil Dynamics and Earthquake Engineering, 178, 108464.
Zhu, S., & Zhang, Y. (2008). Seismic analysis of concentrically braced frame systems with self-centering friction damping braces. Journal of Structural Engineering, 134(1), 121-131.

  • Receive Date 14 June 2024
  • Revise Date 14 August 2024
  • Accept Date 19 August 2024