The analysis of the ductility and cumulative plastic deformation cpd demand of a highperformance buckling restrained brace hpbrb under a strong earthquake and its aftershocks is conducted in this paper. In order to improve the behavior of doubletube buckling restrained braces brbs, it is proposed to set contact rings between inner tube and outer tube of the brace. Pdf 7117 k pdf plus 1572 k analytical study of the seismic performance of allsteel buckling restrained braces with hshaped cores. Abaqus dynamic buckling restrained brace free pdf file. Mar 01, 2016 read seismic evaluation of allsteel buckling restrained braces using finite element analysis, journal of constructional steel research on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. The brb is composed of a ductile steel core, designed to yield during tension and. Comparative study of conventional braces and buckling. A selfcentering buckling restrained braces for curved bridges. Multiindex seismic capacity evaluation of buckling.
A displacement baseddesign dbd method is proposed for steel dual systems incorporating momentresisting frames mrfs and buckling restrained braces brbs. Research on application of buckling restrained braces in. Upgrading the seismic capacity of existing rc buildings using. The damage to a concrete wall caused by a strong earthquake is generally concentrated at the bottom of the concrete wall, which seriously threatens the safety of the steelconcrete hybrid structure and is very difficult to repair after an earthquake. Fatih sutcu et al, seismic retrofit design method for rc buildings using buckling restrained braces and steel frames this paper discusses. Bucklingrestrained braces brbs are widely used as highly ductile seismic devices, with the first building using brbs completed in 1989 in tokyo, and thousands more. The methodology applies to the case of tall buildings, whose dynamic response is significantly influenced by global flexural drift mode and higher modes. Download a pdf of buckling restrained braces applications for. Three configurations of buckling restrained braces are studied together with ordinary braces. To extend the application to bridges, especially longspan bridges located near major seismic faults, research is lacking to support. The core segment of this brace is similar to the conventional brb, but it has a different buckling restraining system. Currently, the new trend towards mass timber vertical structures creates a need for a lightweight compatible lateral force resisting system.
Dual systems can offer an attractive lateral forceresisting solution, combining individual systems in a complementary manner. Pdf buckling restrained braces with different casing systems. Overall stability analysis of improved buckling restrained braces. Design provisions and testing protocols considering farfield earthquakes have been developed by aisc. Field testing of allsteel bucklingrestrained braces applied to a. Article information, pdf download for pseudodynamic test of a deficient rc. Such devices are usually composed of a slender steel core embedded in a. The first practical brb was achieved by fujimoto et al. Analytical study of the seismic performance of allsteel. The buckling restrained brace brb is a axial composite member that buckling restrainer provided around the core member that bears the axial force to prevent overall buckling. Generally, a brb is composed of a core and an external restraining member, between which there is gap or unbonding material to. Tr0601 subassemblage testing of corebrace buckling restrained braces g series by james newell graduate student researcher. Two different brace core segment lengths and two different buckling restraining mechani. Using bucklingrestrained braces on longspan bridges near.
Pseudodynamic test of a deficient rc frame strengthened with. Scribd is the worlds largest social reading and publishing site. Kadam published on 20191203 download full article with reference data and citations. Aim of this study is to compare the conventional steel braces and buckling restrained braces considering a 10 storey rc frame for different configuration of braces. A new type of bucklingrestrained braces with combined. Steel moment resisting frame with open first storeysoft storey is known to perform well compared with the rcframes during strong earthquake shaking.
Conceptual investigation of partially buckling restrained braces abraham, elizabeth jean 2007 conceptual investigation of partially buckling restrained braces. Seismic testing and performance of bucklingrestrained. Mengexperimental investigation of the hysteretic performance of dualtube selfcentering bucklingrestrained braces with. Us6826874b2 buckling restrained braces and damping steel. A displacementbased methodology for the preliminary design of a system of buckling restrained braces is introduced. Development of ductile truss system using double small bucklingrestrained braces. Seismic performance of steel frames equipped with buckling. Displacementbased preliminary design of tall buildings. Development of a displacementbased design method for steel. Conceptual investigation of partially buckling restrained braces.
Investigating modeling approaches of bucklingrestrained. Mar 31, 2018 buckling restrained brace brb is a certain type of brace with great efficiency against lateral loading. Pdf subassemblage testing of corebrace bucklingrestrained. This paper presents the results of a finite element analysis on a brb in which casing has no concrete infill. Development of timber buckling restrained braces for mass. Buckling restrained braced frames brbfs are a new steel seismicloadresisting system that has found use in the western united states because of its efficiency and its promise of seismicperformance. In fact, the retrofitting corrects inappropriate behavior, such as reducing resistance, stiffness and ductility. A numerical model of the structural behavior of buckling. Reducing the length of the yielding segments of buckling restrained braces is being proposed and investigated by many researchers, considering the high strain capacity of steel in the postelastic region. Pdf seismic design of bucklingrestrained braced frames.
Buckling restrained braces are the innovative bracing systems which show same load deformation behaviour under both compression and tension. Buckling restrained braces brbs can be installed in newly designed and erected reinforced concrete buildings and bridge structures to provide superior performance in moderate to severe seismic actions. Probabilistic seismic demand assessment of steel frames. Two groups of brbfs and cbfs including 5, 10 and 15 story frames are modeled and nonlinear pushover analysis is carried out. Seismic design of steel buckling restrained braced.
A combination of three continuous excitations with the same ground motion is used to simulate the affection of a strong earthquake and its aftershocks. Among them, the bucklingrestrained braces are one of the dissipators that have been. Comparative study of buckling restrained braces and conventional braces in a medium rise building. Quantification of energy demand for bucklingrestrained braces. Seismic vulnerability assessment of steel moment resisting. Bracing configurations effect on buckling restrained braced. Apr 26, 2018 the results show that the seismic performance of buckling restrained braces is not the only factor that determines the seismic capacity of brbfs and indicate that the multiindex seismic capacity evaluation method can effectively identify the critical index of a structure and the weakest links that restrict the structural seismic capacity. The basic concepts of buckling restrained braces appeared in the 1970s, when limited experimental successes were reported by several researchers in japan and india. A braced frame that incorporates this type of brace is the buckling restrained brace brb frame brbf brbf is a special class of cbf that precludes brace buckling. Analysis of the seismic demand of highperformance buckling.
Pdf this paper presents experimental investigation of buckling restrained braces brbs with different casing systems. Buckling restrained brace free download as powerpoint presentation. The behavior of conventional bucklingrestrained braces brbs is shown in fig. Institute of steel construction aisc, 2014 manual provides a design for. Buckling restrained braces applications for superstructure and. The design criterion for the casing is to provide adequate lateral restraint i. They employed rectangular steel tubes with infilled mortar for the restrainer, and determined the. In the past decade highly ductile buckling restrained braces brbs have become popular in building seismic design. With the method of equivalent stiffness and displacementbased design method, buckling restrained brace parameters are deduced and are used to model brb in etabs using plastic wen model. Pdf comparative study of buckling restrained braces and. Comparative study of conventional braces and buckling restrained braces in steel frame structure written by mr. Pdf a new bucklingrestrained brace with a variable. Buckling restrained brace frames brbf are a proven and reliable method to provide an efficient lateral.
A numerical model of the structural behavior of bucklingrestrained. Oct, 2017 fatih sutcu et al, seismic retrofit design method for rc buildings using bucklingrestrained braces and steel frames this paper discusses the evaluation of seismic retrofit of building with brb. Development of timber buckling restrained braces for mass timber. This work presents a numerical model of the cyclic structural behavior of dissipative buckling restrained braces, commonly used as an alternative to classical concentric braces for seismic protection of building frames and other structures. Experimental study on the seismic behavior of a steel. Quantification of energy demand for buckling restrained braces by muhib muazzam b.
The casing through its flexural rigidity provides the lateral support against flexural buckling of the core. It is typically made of concretefilled steel tubes. The use of brbs in these applications was found to enhance the seismic performance of bridges. Seismic evaluation of allsteel buckling restrained braces. Buckling restrained braces brbs act as loadcarrying members and energydissipation dampers in the lateral resisting structures. As a result, they can provide lateral constraint for the inner tube. The first buckling restrained braces for practical use was achieved by watanabe et al. Buckling restrained braces the disadvantages of the cbf system can be overcome if the brace can yield during both tension and compression without buckling. Buckling restrained braces brbs are widely used as highly ductile seismic devices, with the first building using brbs completed in 1989 in tokyo, and thousands more. Buckling restrained bracing systems are effectively being used to reduce seismic response during recent years. The current paper compares the seismic performance of buckling restrained braced frames brbfs and ordinary concentrically braced frames cbfs through nonlinear static and time history analysis. Buckling restrained braces are used in a steel framework of a building for absorbing vibration energy generated by an earthquake, to delay the damage of the framework resulting from the shock of the earthquake, and to break prior to breakage of the parts of the framework coupled to the buckling restrained braces. A new type of buckling restrained brace with two combined concretefilled steel tubes as the casing and a core plate as the steel core has been developed by the authors.
But often configurations of these systems are ignored while evaluating their behaviour. Experimental investigation of the hysteretic performance of. However, conventional types of brbs are not suitable to be applied in megaframe and longspan structures. Bucklingrestrained braces are commonly installed in building structures as concentric diagonal or chevron braces to protect the main. This paper describes a subassemblage seismic test program performed on six buckling restrained braces brbs. They employed rectangular steel tubes with infilled mor. A buckling restrained brace brb component is possible to construct and feasible to implement when combining a steel core with a mass timber casing herein named the timber buckling restrained brace tbrb. In this paper, a steelconcrete hybrid structure with buckling restrained braces at a scale of 110 is constructed and tested on a shaking table. Bucklingrestrained braces brbs have become one of the most efficient earthquakeresistant structural systems and have been actively applied to seismic. The buckling restrained brace of the present invention is accomplished by a buckling restrained brace 1 wherein a steelmade center axial member 3 is passed through a buckling constraining concrete member 2 reinforced with a steel member 6, and an adhesionpreventive film 4 is provided to the interface between the steelmade center axial member.
Hysteretic results for refined abaqus model and proof. To further investigate the performance of frames, a selection of near. Buckling restrained braces brbs have recently seen increasing use worldwide as ductile seismic resistant members and this year celebrates the 30th anniversary from the first application in 1987. Pdf bucklingrestrained braces brbs, which were first applied in 1989 in japan, are now widely used worldwide. Buckling restrained braced frames pdf buckling restrained braced frames pdf download. Seismic design of buckling restrained braced frames. Buckling restrained brace buckling structural engineering. The stiffness values of buckling restrained brace frames can highly degrade when the core segments are yielded. Determination the response modification factors of buckling.
Parametric study to compare different configurations of. Seismic study of buckling restrained brace system without. Brbs are also applicable in highrise buildings, used as outrigger braces in order to transfer significant seismic forces to perimeter columns. Behavior of conventional bucklingrestrained braces adopted from. In this paper, a new type of buckling restrained brace characterized by a variable crosssection core brbvcc is proposed and investigated.
Aim of this study is to consider the effect of different bracing configurations on the behaviour of buckling restrained braced framesbrbfs. Subassemblage testing of corebrace buckling restrained braces g series. Buckling restrained braced frames pdf buckling restrained braced frame brbf. Development of ductile truss system using double small.
282 602 706 886 883 907 1273 272 621 279 1330 978 1513 337 470 484 592 1359 1066 143 719 824 296 1043 1091 525 1293 1178 608 1237 153 843 325 228 513 1305 1190 297 327 1339