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Such devices allow a significant improvement of the seismic behavior of the building.
Fig. 9: Behavior of conventional brace (left) and buckling restrained brace (right).
Buckled out unsatisfying nonlinear behaviour Unbuckled satisfying nonlinear behaviour Fig. 10: Behavior of conventional brace and buckling restrained brace (Deulkar, Modhera and Patil [20]).
[12] Di Sarno, L., Manfredi, G., Experimental tests on full scale RC frames retrofitted with buckling restrained braces, Behaviour of Steel Structures in Seismic Areas, STESSA 2009, Edited by Richard Sause, Federico M.
[16] Uang, C-M., Nakashima, M., Steel buckling-restrained braced frames, Chapter 16, CRC Press, Boca Raton, Florida, (2004)

Study on the Seismic Performance of the Braced Controlled Rocking Reinforced Concrete Frame Structure System Pei Li1, a, Jianxin Liu1, 2, b 1Shanghai Jianqiao University, Shanghai 201315, China 2College of Civil Engineering, Shanghai Normal University, Shanghai 201418, China a13816291736@163.com, bljx163@163.com (Corresponding Author) Keywords: Braced controlled rocking;Rocking joints;Joints weakening;Time history analysis Abstract.
On the basis of structural concept design, this paper puts forward a new braced controlled rocking reinforced concrete frame structure system, researching dynamic characteristics of the BCR-RCF structure when the joints is been weakened in different levels by using finite element analysis software Abaqus, analyzing the reasonable degree of rocking joints stiffness weakening.
After the subjoining of the metal damper, the displacement response is braced controlled effectively while the other responses change a little.
The behavior of inverted pendulum structures during earthquakes [J].
Seismic response of precast prestressed concrete frames with partially debonded tendons [J].

The damping mechanism of buckling restrained braces is clear, the effect is significant, safe, reliable and economical, it can be used in structures that have different seismic requirements and seismic intensity.
A study of buckling restrained seismic braced frame, Structural Engineering, “Chinese Society of Structural Engineering”.17(2).
Seismic behavior of concentrically braced steel flames[R].
[3] Redwood R G, Channagiri V S, Earthquake-resistant design of concentrically braced steel frames[J].
Buckling-Restrained braced frames.

The damper absorbs seismic energy through its hysteretic behaviour.
The device is implemented in the structure to dissipate seismic input energy by hysteretic behaviour of its element.
It is noted that the damper yield displacement has to be less than the frame yield displacement in order to dissipate the energy through hysteretic behaviour.
The stiffness parameter is defined to be the ratio of lateral frame stiffness and the equivalent brace-damper stiffness [6].
"Analysis of the steel braced frames equipped with ADAS devices under the far field records."

The innovative steel braces allow a significant improvement of the seismic behavior of the building by providing a better dissipation of the seismic input energy in the structure and thus ensuring a better performance of the RC structure in the elastoplastic range.
The formation of plastic hinges has been assumed in order to suitably reproduce the nonlinear mechanical behavior of the building under a seismic event.
Fig. 3: Typical non-linear behavior of the steel brace in tension and in compression.
Such devices allow a significant improvement of the seismic behavior of the building.
[13] De Angelis, F., Cancellara, D., On the influence of the elastic medium stiffness in the buckling behavior of compressed beams on elastic foundation, Applied Mechanics and Materials, Vol. 166-169, pp. 776-783, 2012

Experiment on the Hysteretic Behaviors of Light-weight Steel Portal Frame with Tapered Members Qicai Li 1,a, Zhenshan Wang2,b, Mingzhou Su2,c, Xuechao Shao1,a, Lin Shen3,d 1.
Abstract: In order to study the seismic behavior of steel portal frame structures, Cyclic loading test on a 1:3-scaled model of single-story single-bay steel portal frame with tapered members has been carried out.
Introduction The steel portal frame is widely used in practical engineering, but there are a few of studies on seismic behavior of this structural type both at home and abroad.
Seismic behavior of gable frame consisting of tapered members.
Experimental research on hysteretic behavior of light-weight steel portal frame.

Fragility curves are generated, demonstrating the significant role that member fracture has on the seismic performance of braced frames.
This paper presents a numerical seismic performance analysis of 7-, 15- and 21-story steel braced frames including brace and beam-end fracture.
Both buckling-restrained braced frames (BRBF) and conventional concentric braced frames (CBF) with circular hollow section (CHS) braces were considered.
The CBF braces were modelled using a phenomenological model capturing the global buckling behavior [8], while a bilinear hysteresis with a tangent stiffness of 0.01 times the initial stiffness was used for the BRBs.
Similar behavior was observed when RE exceeded 2.0 for the 7-story frames, and when RE exceeded 1.5 for both the 15- and 21-story frames.

Controlled rocking steel braced frames (CRSBFs) have been proposed as a low-damage seismic force resisting system with reliable self-centering capabilities.
A leaning column was included to model P-Delta effects.
Deierlein, Seismic design and behaviour of self-centering braced frames with controlled rocking and energy dissipating fuses, Report 174, John A.
Christopoulos, Performance-based seismic design of controlled rocking steel braced frames.
Christopoulos, Performance-based seismic design of controlled rocking steel braced frames.

As the frames are braced at either direction, X and Y, the revealing of axial hinges is expected to happen in the middle of columns which are shown by triangles in the figure.
According to Iran provision of loading this factor for special moment frames having eccentrically braced frame is 7.5 and for intermediate moment frames having eccentrically braced frame is 6.
performance of five buildings with eccentrically braced frames.
Popov, Shear links in eccentrically braced frames.
Popov, Seismic behavior of active beam links in eccentrically braced frames. 1983, Report No.

Both solutions provide a traditional steel multi-braced frame in the centerline of the building.
Due to the effect of the glass plates, the stiffness of the multi-bracing hybrid system can be advantageously used by inserting dissipative links in connection with the building.
Before collapse a relevant reduction of axial stiffness occurs, according to experimental tests on compressed glass panels [3], joined with a post-critical behavior caused by the unilateral support of the panel.
It has been also analyzed the mechanical behavior of the steel braced structures, in absence of glass panels; the results are summarized in fig. 8.
With respect to the original conditions, the braced structures are able to carry about 90% of the global shear force, significantly reducing the transverse action on the existing r. c. columns.