A unique analytical model for short, intermediate and long links in eccentrically braced frames

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A. Ashatari; ERFANI S.; NEKOOEI M.

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Journal: Modares Civil Engineering journal Year:2019 | Volume:19 | Issue:2 Page(s): 1-12

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Title

A unique analytical model for short, intermediate and long links in eccentrically braced frames

Author(s)

A. Ashatari | ERFANI S. | NEKOOEI M. | Issue Writer Certificate

Keywords

Eccentrically braced framesQ1

Short linkQ1

Intermediate linkQ1

Long linkQ1

Analytical modelQ1

Abstract

The purpose of this study is to develop the previous proposed Analytical model by the first and second authors for Short links, so it can be used for all kinds of links including short, intermediate, and Long links. Eccentrically braced frames (EBF) offer high lateral stiffness because of their braced configuration while also providing high ductility and energy dissipation. They are widely used as a lateral-force resisting system for multi-story buildings located in seismic areas. The key components of the EBF system include columns, collector beams, braces and active links. The link is defined by a horizontal eccentricity between the intersection points of the two brace centerlines with the beam centerline (or between the intersection points of the brace and column centerlines with the beam centerline for links adjacent to columns). The active links are designed to provide ductility and energy dissipation through yielding under design basis earthquakes, while all other structural members are designed to be stronger than the links and stay in elastic range. The link length is often normalized with respect to the ratio between the plastic moment capacity and the plastic shear capacity of the link section. This normalized link length is called the length ratio. Links with a length ratio less than 1. 6, called short or shear links, yield primarily in shear and can be designed for 0. 08 radian inelastic rotation. Links with length ratio greater than 2. 6, called Long links, form flexural hinges at either end and can be designed for 0. 02 radian inelastic rotation. Links with length ratios between 1. 6 and 2. 6, called Intermediate links, experience a combination of flexural and shear yielding and can be designed for inelastic rotations between 0. 02 and 0. 08 radian depending on the length ratio. Sufficient Analytical model which can accurately predict the inelastic performance of the links is needed to perform reliable nonlinear analyses of EBFs. Analytical models that are used to study the inelastic seismic response of the EBFs usually reflect the anticipated behavior of the different frame elements. Links are modeled as inelastic elements with concentrated end flexural and shear hinges. Beams outside of the link, braces, and columns are typically modeled as elastic beam-column elements, because no inelastic behavior is anticipated in design. It is said in the literature that available Analytical models for Short links generally predict very well the maximum shear forces and deformations from experiments on Short links, but may underestimate the intermediary values. In this study it is shown that available Analytical models do not predict very well the maximum shear forces and deformations too. To the authors’ knowledge, currently there are only suitable Analytical models for Short links. In this study an Analytical model which can accurately predict both maximum and intermediary values of forces and deformations for short, intermediate, and Long links, is proposed. The parameters of model are established based on test results from several experiments on links and EBFs. Comparison of available test results with the hysteresis curves obtained using the proposed Analytical model established the accuracy of the model. The proposed model is recommended to be used to perform inelastic analyses of EBFs.

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APA: Copy

A., Ashatari, ERFANI, S., & NEKOOEI, M.. (2019). A unique analytical model for short, intermediate and long links in eccentrically braced frames. MODARES CIVIL ENGINEERING JOURNAL, 19(2 ), 1-12. SID. https://sid.ir/paper/369950/en

Vancouver: Copy

A. Ashatari, ERFANI S., NEKOOEI M.. A unique analytical model for short, intermediate and long links in eccentrically braced frames. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2019;19(2 ):1-12. Available from: https://sid.ir/paper/369950/en

IEEE: Copy

Ashatari A., S. ERFANI, and M. NEKOOEI, “A unique analytical model for short, intermediate and long links in eccentrically braced frames,” MODARES CIVIL ENGINEERING JOURNAL, vol. 19, no. 2 , pp. 1–12, 2019, [Online]. Available: https://sid.ir/paper/369950/en

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