Seismic performance of concentrically braced frames with and without brace buckling

Şeker, Onur; Akbaş, Bülent; Seker, Pinar Toru; Shen, Jay; Faytarouni, Mahmoud

doi:10.1016/j.engstruct.2017.03.043

Cited by 47 publications

(21 citation statements)

References 30 publications

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“…Concrete Damage Plasticity (CDP) in Abaqus was employed to simulate the concrete material and the nominal compressive strength of the concrete was assumed as ′ = 24 N/mm 2 . More details about CDP and nonlinear modeling in Abaqus are available in literatures [32][33][34][35][36][37][38]. Elastic and plastic properties of concrete and steel in tension and compression were included in the models.…”

Section: Materials Propertiesmentioning

confidence: 99%

A Numerical Investigation on Behavior of Column Base Plates with Different Configurations

Shafieifar

Khonsari

2018

CivileJournal

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Base plates are one of the most important types of connections in structures. Due to complicated steel-concrete interaction, simple assumptions of the stress distributions are usually employed for designing the connection. Simple assumptions of compressive stress distribution in concrete may accelerate the design procedure, but they may lead to overdesign results. In this study, six different types of base plates with different configuration were studied numerically using a commercial Finite Element (FE) software and the numerical model was calibrated with an experimental test. The models were subjected to a constant axial load and then a monotonic moment loading was applied. To investigate the effects of the axial load, several axial load level were considered for each configuration. As a result, moment-rotation curves of these base plates, including their rotational stiffness, in the absence and presence of the axial loads, were compared. Moreover, the stress distribution in the concrete was studied in the FE models. For all cases, the stress distribution in the concrete was semi-triangular with the maximum stress between the column flange and the edge of the plate. Based on numerical results, some concepts of simplified assumptions were proposed to find the stress distribution of the base plates. These assumptions are more realistic than current assumptions in structural specifications.

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Section: Materials Propertiesmentioning

confidence: 99%

A Numerical Investigation on Behavior of Column Base Plates with Different Configurations

Shafieifar

Khonsari

2018

CivileJournal

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“…Initially, normal steel braces were installed in steel frames to enhance seismic capacity. For example, Shen et al [7] compared normal brace and BRBs and indicated that BRB is more efficient than normal braces in earthquake resistance. Hsiao et al [8] proposed a sophisticated model to capture the buckling behavior of normal steel braces.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Analysis of Multi-Story Steel Frames Using BRB and SCB Hybrid Bracing System

2019

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Multi-story steel frames are popular building structures. For those with insufficient seismic resistance, their seismic capacity can be improved by installing buckling-restrained braces (BRBs), which is known for high energy dissipation capacity, and the corresponding frame is denoted as BRB frame (BRBF). However, BRBFs are frequently criticized because of excessive residual deformations after earthquakes, which impede the post-event repairing work and immediate occupancy. Meanwhile, self-centering braces (SCBs), which were invented with a particular purpose of eliminating residual deformation for the protected structures, underwent fast development in recent years. However, the damping capability of SCBs is relatively small because their hysteresis is characterized by a flag shape. Therefore, this paper aims to combine these two different braces to form a hybrid bracing system. A total of four combinations are proposed to seek an optimal solution. The multi-story steel frames installed with BRBs, SCBs, and combined braces are numerically investigated through nonlinear static and dynamic analyses. Interested seismic response parameters refer to the maximum story drift ratios, maximum floor accelerations, and residual story drift ratios. The seismic analysis results indicate that the frames using the combined bracing system are able to take the advantages of BRBs and SCBs.

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“…They observed that the plastic hinges occurred first at the fuse section of braces and later at the compressive members of the eccentric braces. Shen et al [30] conducted an analytical study on seismic performance of CBFs using two-story X-braced frames with strong and weak braced-intersected beams and inverted V braced frames with and without brace buckling. They found out that the braces in CBFs are fractured often before 2% story drift ratio response mainly because of premature yielding of the beams.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Behavior of Steel Moment-Resisting Frames with Different Bracing Systems Based on a Response-Based Damage Index

Karsaz

Tosee

2018

CivileJournal

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Seismic rehabilitation of existing buildings is one of the most effective ways to reduce damages under destructive earthquakes. The use of bracings is one of techniques for seismic rehabilitation of steel structures. In this study we aimed to investigate the seismic performance of three 5, 10 and 15-storey steel structures with moment-resisting frames designed three dimensionally in ETABS 2015 application based on first edition of Iranian Standard 2800. Their damage under five ground motions was evaluated using response-based damage model proposed by Ghobara et al. (1999). Then, the structures were rehabilitated with different bracing systems (X, eccentric and concentric V and inverted-V) and, again, their damage under five earthquakes were evaluated and compared with those of moment resisting frames. The pushover analysis results indicated that X-braced frame was the least ductile system but had highest initial stiffness and yield stress. In low-rise building, X-braced frames showed better performance among studied bracing systems compared to moment resisting frames, while mid and high-rise buildings with eccentrically braced frame (EBF) showed the best behavior against earthquakes with the least damage. Moreover, it was found out that EBFs' performance increases by increasing storey height, but for concentrically braced frames (CBFs) it was decreased. We concluded that the use of response-based damage models can be a suitable procedure for estimating the vulnerability of steel structures rehabilitated with bracing system.

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Seismic performance of concentrically braced frames with and without brace buckling

Cited by 47 publications

References 30 publications

A Numerical Investigation on Behavior of Column Base Plates with Different Configurations

A Numerical Investigation on Behavior of Column Base Plates with Different Configurations

Seismic Response Analysis of Multi-Story Steel Frames Using BRB and SCB Hybrid Bracing System

A Comparative Study on the Behavior of Steel Moment-Resisting Frames with Different Bracing Systems Based on a Response-Based Damage Index

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