Assessment of current nonlinear static procedures for seismic evaluation of BRBF buildings

Nguyen, An Hong; Chintanapakdee, Chatpan; Hayashikawa, Toshiro

doi:10.1016/j.jcsr.2010.03.001

Cited by 21 publications

(10 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cross‐section area of transition and end segments ( A t and A e ) of the BRB elements were chosen as 1.6 and 2.2 times the cross‐section area of the core cross section, respectively. Besides, the length of the transition and end segments were chosen as 0.06 and 0.24 times the total length of the bracing (Nguyen et al ., ).…”

Section: Nonlinear Modelingmentioning

confidence: 97%

Seismic assessment of RC core-wall building capable of three plastic hinges with outrigger

Beiraghi

Siahpolo

2016

Struct Design Tall Spec Build

View full text Add to dashboard Cite

In a core-wall structure with buckling restrained braces (BRB) outrigger, locations of the plastic hinges are influenced by the outrigger action. Therefore, the designer should consider the issue and use suitable details in the plastic hinge area. The essential questions that arise here are the plastic hinge location and the design moment demand used for design of this kind of structure. In this paper, responses of the core-wall buildings with BRB outrigger designed by using the traditional response spectrum analysis procedure are assessed by implementing the nonlinear time history analysis. The result demonstrates that the plasticity can extend over anywhere within the core-walls specially, at the base and above or below the outrigger levels. Formation of three plastic hinges in the core-wall is recognized suitable for the system. To control the plasticity extension in the core-wall, it is recommended that a new modal combination method be applied to calculate the moment strength of the three plastic hinges over the height. A capacity design concept is used to design other regions of the core-wall where the plasticity does not extend to. The proposed procedure improves behavior of the system by restricting the plasticity extension to the predefined plastic hinge regions. levels in the first case. Therefore, placement of the outrigger at 0.5H is not recommended according to the displacement demand. CAPACITY DESIGN APPROACHThe philosophy of capacity design in structural seismic engineering ensures that during an earthquake, the structure responds in a favorable ductile manner. This is achieved by pre-selecting an appropriate plastic mechanism and then providing special detailing to the plastic hinge regions. Providing enough ductility in these regions leads to energy dissipation under severe earthquakes (Park and Paulay, 1975;Paulay and Priestley, 1992). Capacity design approach can keep the large portion of the core-walls elastic and facilitate the detailing of the reinforcement there. The ease of detailing and reduction in Figure 11. Average of the (a) curvature ductility, (b) moment, (c) shear, (d) inter-story drift ratio and (e) lateral displacement envelop, in 40-story core-wall.

show abstract

Section: Nonlinear Modelingmentioning

confidence: 97%

Seismic assessment of RC core-wall building capable of three plastic hinges with outrigger

Beiraghi

Siahpolo

2016

Struct Design Tall Spec Build

View full text Add to dashboard Cite

show abstract

“…Their recommendations show significant variation which is explained by the simplicity of their approach to numerical simulation. BRB behavior is typically represented by a bilinear material model with significant kinematic hardening [16]. The hardening rate ranges from 2% to 5% of the initial stiffness.…”

Section: Design Procedures For Brbfmentioning

confidence: 99%

On the European Norms of Design of Buckling Restrained Braced Frames

Zsarnóczay¹,

Balogh²,

Vigh³

2017

TOCIEJ

View full text Add to dashboard Cite

Abstract:The application of buckling restrained braced frames is hindered in Europe by the absence of a standardized design procedure in Eurocode 8, the European seismic design standard. The presented research aims to develop a robust design procedure for buckling restrained braced frames. A design procedure is proposed by the authors. Its performance has been evaluated for buckling restrained braced frames with two-bay X-brace type brace configurations using a state-of-the-art methodology based on the recommendations in the FEMA P695 document. A special numerical material model was developed within the scope of this research to represent the behavior of buckling restrained braces more appropriately in a numerical environment. A total of 24 archetype designs were prepared and their nonlinear dynamic response was calculated using real ground motion records in incremental dynamic analyses. Evaluation of archetype collapse probabilities confirms that the proposed design procedure can utilize the advantageous behavior of buckling restrained braces. Resulting reliability indices suggest a need for additional regulations in the Eurocodes that introduce reasonable structural reliability index limits for seismic design.

show abstract

“…The cross-section area of transition and end segments (At and Ae) of the BRB elements were selected as 1.6 and 2.2 times the cross-section area of the restrained yielding core portion, respectively. Furthermore, the lengths of the transition and end segments were assumed to be 0.06 and 0.24 times the total length of the bracing [51]. Figure 4 plots the BRB components and Figure 5 shows the hysteretic response of the BRBs used in the structures.…”

Section: Brb Modelingmentioning

confidence: 99%

Forward directivity near-fault and far-fault ground motion effects on the responses of tall reinforced concrete walls with buckling-restrained brace outriggers

Beiraghi

2017

Scientia Iranica

View full text Add to dashboard Cite

Abstract. In this study, the responses of reinforced concrete core-wall structures connected to the outside columns by Buckling-Restrained Brace (BRB) outriggers in tall buildings were investigated. The buildings were subjected to forward directivity Near-Fault (NF) and ordinary Far-Fault (FF) ground motions. According to the current codes for the DBE level, the response spectrum analysis procedure was applied to analyze and design the structures. The nonlinear ber element approach was used to simulate the reinforced concrete core-walls. Nonlinear time history analysis was implemented using 14 NF as well as 14 FF records at MCE level. In the core-wall, the results showed that the mean moment demand envelope and the mean shear demand envelope obtained from the NF records were approximately similar to the corresponding demand envelopes from FF records. The reason had to do with extending plasticity all over the RC core-wall, which was subjected to both sets of records. The overall responses of the reinforced concrete core-wall with BRB outrigger system were in acceptable range both for NF and FF earthquakes. In this study, the largest curvature ductility demand in the reinforced concrete core-wall took place at levels just above the outriggers.

show abstract

Assessment of current nonlinear static procedures for seismic evaluation of BRBF buildings

Cited by 21 publications

References 18 publications

Seismic assessment of RC core-wall building capable of three plastic hinges with outrigger

Seismic assessment of RC core-wall building capable of three plastic hinges with outrigger

On the European Norms of Design of Buckling Restrained Braced Frames

Forward directivity near-fault and far-fault ground motion effects on the responses of tall reinforced concrete walls with buckling-restrained brace outriggers

Contact Info

Product

Resources

About