Performance-Based Plastic Design of Eccentrically Braced Frames Equipped with Mass Dampers and Horizontal Link Beams

Authors

1 Assistant Professor, Department of Civil-Structural Engineering, Hakim Sabzevari University, Sabzevar, Iran

2 Department of Civil Engineering, Hakim Sabzevari University, Sabzevar 9617976487-397, Iran

3 Department of Civil Engineering, Islamic Azad University, Neyshabur, Iran

Abstract

Different building codes employ varying criteria for base shear calculation, a process influenced by parameters such as construction site location and local seismicity. In most existing codes, the base shear force is distributed over the height based on the elastic analysis, while the inelastic structural behavior is incorporated indirectly. The design base shear (V) is reduced by the behavior coefficient (R) to account for the structure's nonlinear behavior, which is primarily a function of its ductility and overstrength. After strength-based design, the design story drift is calculated by multiplying the elastic displacement by a displacement amplification factor (Cd). The vertical distribution of seismic forces is mainly determined based on the first mode of the structure.
Currently, Iran employs Standard No. 2800 for determining the lateral distribution of seismic forces, a code closely aligned with UBC 1994. In contrast, the United States utilizes the IBC 2009 provisions for this purpose. There are two methods for designing structures: the Allowable Stress Design (ASD) and the Load and Resistance Factor Design (LRFD) methods. Ductility in steel structures is achieved by designating specific, strategically detailed elements as "fuses" that yield plastically during an earthquake to dissipate energy. In the seismic design of steel structures, the fuse element is designed to yield under code-specified factors, while all other members are designed for the maximum forces generated by the fuse's full capacity. However, this process does not guarantee the formation of the ideal structural mechanism envisioned by the designer. The ideal plastic mechanism involves shear yielding of the link beams coupled with flexural yielding at the base of the first-story columns during a severe earthquake. To solve this problem, the performance-based plastic design (PBPD) method was introduced in previous studies. In this method, the target displacement and the yield mechanism serve as key performance parameters. The PBPD method is founded on the energy balance approach, a concept that was firstly proposed by Housner in 1956.

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References

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Journal of Civil and Environmental Engineering
Volume 56, Issue 123 - Serial Number 123
Summer 2026
September 2026
Pages 25-35

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