Structures with Added Buckling Restrained Brace Elements (original) (raw)
Related papers
Seismic Analysis of Building Structure with Buckling Restrained Brace
Conventional braces have limited deformation ductility capacity, and exhibit unsymmetrical hysteretic cycles, with marked strength deterioration when loaded in compression. To overcome the above mentioned problems, a new type of brace was developed in Japan called as buckling restrained braces, designated as BRB's. These braces are designed such that buckling is inhibited to occur, exhibiting adequate behavior and symmetrical hysteretic curves under the action of both tensile and compressive cycles, produced by the action of seismic and wind forces. Nonlinear time history analysis, response spectrum method and pushover analysis of 10-story 2D frame is carried using software, ETAB. The response parameters used to evaluate structural performance are natural time period, story displacement, inter story drift, story shear and axial forces.
In the last years BRB were used in existing structures and in new ones as primary lateral force resisting elements. Retrofit of existing buildings in seismic areas can be made by using buckling restrained braces (BRBs), because they have the ability to sustain large inelastic deformations without important loss of strength. This study analyzes the possibility of using BRBs to improve the seismic response of tall reinforced concrete buildings. Therefore dynamic nonlinear analysis was performed on two tall structures: first, one structure with reinforced concrete walls (that has been designed according to the Romanian Seismic Design Code) and then the same structure with buckling restrained braces included. Computation was made for three recorded accelerograms. The aim of the study was to highlight the advantages and disadvantages of using BRBs together with reinforced concrete walls for improving the seismic response of tall buildings. Parameters like natural period, deformations and stresses were carefully evaluated and then some comparatively studies were made in order to establish the efficiency of the buckling restrained braces.
Comparative Study of Buckling Restrained Braces and Conventional Braces in a Medium Rise Building
Earthquake forces on the structures are great concern for the engineers. To minimize the effects of Earthquake and lateral forces on the structure, bracing system is one of the systems which play an effective role in resisting the lateral forces in buildings. New type of bracing system, called Buckling Restrained bracing system, has many advantages over conventional bracing, hence can be employed in the structure.
Seismic Response of Multi-Storey Building with Buckling Restrained Brace System
Buckling Restrained Braces (BRBs) are made up by a steel core surrounded by a buckling restraining system, coated with an unbonding material. The buckling restrained system prohibits steel core from buckling when in compression. Experimental studies have been carried out to study the behavior of BRBs. Experimental results showed that the BRB exhibit stable hysteresis response with substantial energy dissipation and ductility. Therefore, seismic performance of buildings or other structure can improve effectively by using BRBs. In this work, numerical studies of eleven models were conducted using ETABS software. The numerical tests were carried out in different scenarios, i.e. building the model with a conventional brace system, building models with partial BRBs system and building models with BRBs system. From both equivalent static analysis and response spectrum analysis main findings are the effects of yielding core length on partial replaced BRBs system and BRBs system buildings are significant in controlling or altering base shear, maximum storey displacement and storey drift, and time period. Also, BRBs are effective in reducing the axial force for column and footing.
Application of Buckling Restrained Braces in a 50-Story Building
The use of Buckling Restrained Braces (BRB) for enhancing the performance of the buildings is gaining wider acceptance. This paper presents the first application of these devices in a major high-rise building in the Philippines. A 50-storey residential reinforced concrete building tower, with ductile core wall, with BRB system is investigated. The detailed modeling and design procedure of buckling restrained brace system is presented for the optimal design against the two distinct levels of earthquake ground motions; serviceable behavior for frequent earthquakes and very low probability of collapse under extremely rare earthquakes. The stiffness and strength of the buckling restrained brace system are adjusted to optimize the performance of the structural system under different levels of earthquakes. Response spectrum analysis is conducted for Design Basis Earthquake level and Service level, while nonlinear time history analysis is performed for the most credible earthquake. The case study results show the effectiveness of buckling restrained braces.
Seismic behavior of RC building with and without buckling restrained braces / Daniel Rumbi Teruna
2019
Nonlinear analysis for evaluating seismic performance of building under seismic excitation requires nonlinear properties of any component that are quantified by strength and deformation capacities. The nonlinear behavior of beams and column components are modeled in the form of plastic hinges as described in ASCE41-13 [1] guideline. This document provides the hinge rotation capacity for several ranges of detailing assumption. Buckling restrained braces (BRB) can be modeled as a link element with forcedeformation behavior through Wen's plasticity model. This paper evaluates possible differences of seismic performance of six-story reinforced concrete moment resisting frame with conforming and non-conforming plastic hinge rotation, with and without BRB in placed. The nonlinear static analysis is performed to obtain capacity curve using inverted triangular load pattern as described in ASCE7-10 [2]. The behaviors of investigating frames are discussed and evaluated by means of capacity curves and plastic hinge formation mechanism. Moreover, nonlinear time history analysis is carried out to investigate the effect of BRB properties on the seismic behavior of building model subjected to selected ground motion records. Furthermore, response parameters of building model are presented and compared in the form of base shear, story displacement, and story drift.
Seismic performance of structural systems equipped with buckling-restrained braces
2017
Buckling-restrained braces (BRBs) are often employed for the seismic retrofit of existing systems and the design of new systems given their significant contribution in terms of stiffness and added damping. However, since BRBs are characterized by a low lateral post-elastic stiffness, their use may lead to excessive residual deformations that may jeopardize the reparability of the building. Moreover, accumulation of plastic deformations in the BRBs may endanger the capability of withstanding multiple earthquakes and aftershocks. The objective of this paper is to provide insight into the performance and residual capacity of dual systems made of BRB frames coupled with moment-resisting frames. This study considers a simplified single degree of freedom model which permits to investigate a wide range of configurations. A non-dimensional formulation of the equation of motion is introduced, the statistic of the normalized peak and residual displacements and cumulative ductility of the syst...
Seismic Behavior of RC Building with and Without Buckling Restrained Braces
Journal of Mechanical Engineering, 2019
Nonlinear analysis for evaluating seismic performance of building under seismic excitation requires nonlinear properties of any component that are quantified by strength and deformation capacities. The nonlinear behavior of beams and column components are modeled in the form of plastic hinges as described in ASCE41-13 [1] guideline. This document provides the hinge rotation capacity for several ranges of detailing assumption. Buckling restrained braces (BRB) can be modeled as a link element with forcedeformation behavior through Wen's plasticity model. This paper evaluates possible differences of seismic performance of six-story reinforced concrete moment resisting frame with conforming and non-conforming plastic hinge rotation, with and without BRB in placed. The nonlinear static analysis is performed to obtain capacity curve using inverted triangular load pattern as described in ASCE7-10 [2]. The behaviors of investigating frames are discussed and evaluated by means of capacity curves and plastic hinge formation mechanism. Moreover, nonlinear time history analysis is carried out to investigate the effect of BRB properties on the seismic behavior of building model subjected to selected ground motion records. Furthermore, response parameters of building model are presented and compared in the form of base shear, story displacement, and story drift.
IRJET-SEISMIC ANALYSIS OF BUILDING STRUCTURE WITH BUCKLING RESTRAINED BRACE
Conventional braces have limited deformation ductility capacity, and exhibit unsymmetrical hysteretic cycles, with marked strength deterioration when loaded in compression. To overcome the above mentioned problems, a new type of brace was developed in Japan called as buckling restrained braces, designated as BRB’s. These braces are designed such that buckling is inhibited to occur, exhibiting adequate behavior and symmetrical hysteretic curves under the action of both tensile and compressive cycles, produced by the action of seismic and wind forces. Nonlinear time history analysis, response spectrum method and pushover analysis of 10-story 2D frame is carried using software, ETAB. The response parameters used to evaluate structural performance are natural time period, story displacement, inter story drift, story shear and axial forces.
The high-rise buildings that are made of RCC frame, the greater importance is given to make structure safe against lateral load. These loads are produced due to wind, earthquakes etc. To resist lateral load acting on bu or RCC bracing systems are provided. The use of RCC bracing has potential advantage than other bracing like higher stiffness and stability. This study aimed the comparison of different RCC bracing system under seismic behavi buildings. Also three structural configurations used in this paper are Moment Resisting Frames (MRFs), X storey (G+10) building. The bracing systems provided on periphery of the column. The frame models are analyzed as per IS: 1893 ETABs software's. The parameters which are considered in this paper for comparing seismic effect of buildings are base shear and storey displacement. The results showed that X-braced frames are more efficient and safe at time of earthquake when compared with moment resisting frames and V rise buildings that are made of RCC frame, the greater importance is given to make structure safe against lateral load. These loads are produced due to wind, earthquakes etc. To resist lateral load acting on building different types of steel or RCC bracing systems are provided. The use of RCC bracing has potential advantage than other bracing like higher stiffness and stability. This study aimed the comparison of different RCC bracing system under seismic behavior in high rise buildings. Also three structural configurations used in this paper are Moment Resisting Frames (MRFs), X-Braced Frames (XBFs), V-Braced Frames (VBFs) for 11 storey (G+10) building. The bracing systems provided on periphery of the column. e frame models are analyzed as per IS: 1893-2000 using STADD.ProV8i and ETABs software's. The parameters which are considered in this paper for comparing seismic effect of buildings are base shear and storey displacement. The results showed rames are more efficient and safe at time of earthquake when compared with moment resisting frames and V-braced frames. rise buildings that are made of RCC frame, the greater importance is given to make structure safe against lateral load. These loads are produced due to ilding different types of steel or RCC bracing systems are provided. The use of RCC bracing has potential advantage than other bracing like higher stiffness and stability. This study aimed the or in high rise buildings. Also three structural configurations used in this paper are Moment Braced Frames (VBFs) for 11 storey (G+10) building. The bracing systems provided on periphery of the column. 2000 using STADD.ProV8i and ETABs software's. The parameters which are considered in this paper for comparing seismic effect of buildings are base shear and storey displacement. The results showed rames are more efficient and safe at time of earthquake when