Optimum Plastic Design of Moment Resisting Frames Using Mechanism Control

Sepahvand, Mostafa Fathi; Âkbari, Jafar; Kusunoki, Koichi

doi:10.1016/j.istruc.2018.10.002

Cited by 8 publications

(1 citation statement)

References 31 publications

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“…As a consequence, in the recent years, the TPMC has established its role of code competitor, gaining more popularity, and it has been widely used in the framework of European RFCS projects, [6][7][8][9] thus inspiring several researchers around the World. [10][11][12][13] Moreover, it has been extended to several structural typologies both in steel and reinforced concrete. [14][15][16][17][18][19][20][21] Furthermore, recently a rigorous probabilistic approach has been also proposed.…”

Section: Introductionmentioning

confidence: 99%

Theory of plastic mechanism control: A new approach for the optimization of seismic resistant steel frames

Montuori

Nastri

Piluso

2022

Earthq Engng Struct Dyn

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This paper presents an important improvement in seismic design of structures based on the application of the Theory of Plastic Mechanism Control (TPMC). TPMC was originally proposed in the ‘90s requiring an iterative algorithm and upgraded in 2015 leading to the so‐called closed form solution. In the recent years, TPMC has shown its value as an effective design procedure which can be applied to any structural typology. Moreover, it has been used as a code competitor design tool in important RFCS founded research projects confirming its effectiveness, simplicity, and suitability to any structural typology. The aim of the TPMC is the design of structures able to exhibit at collapse a global type mechanism. The TPMC was originally based on the extension of the kinematic theorem of plastic collapse to the concept of mechanism equilibrium curve, working in the α−δ$\alpha - \delta $ plane (being α the multiplier of the seismic forces and δ the top sway displacement). The novelty of this work is improvement of the design procedure by working in the α−θ$\alpha - \theta $ plane, being θ the plastic rotation. This new TPMC approach, namely TPMC(θ), has demonstrated to be as reliable as the former approach, thus leading to structures able to develop a collapse mechanism of global type but with the optimization of the structure using lighter columns. The effectiveness of the new procedure has been confirmed by both pushover and dynamic non‐linear analyses.

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Section: Introductionmentioning

confidence: 99%

Theory of plastic mechanism control: A new approach for the optimization of seismic resistant steel frames

Montuori

Nastri

Piluso

2022

Earthq Engng Struct Dyn

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Seismic design of steel moment‐resisting knee‐braced frame system by failure mode control

Sepahvand,

Lenwari

2024

Earthq Engng Struct Dyn

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This paper presents the seismic design of a steel moment‐resisting knee‐braced frame (MKF) using the theory of plastic mechanism control (TPMC) within the capacity‐based design framework. The MKF is an alternative system to MRFs, wherein knee elements are utilized to provide rigid connections and enhance lateral stiffness. Capacity‐based design, the predominant approach in current seismic provisions, relies on two key principles: (1) selecting specific structural components as fuses with sufficient ductility to dissipate seismic energy, and (2) ensuring non‐fuse elements can resist the maximum probable reactions from these fuses. The ultimate goal is to achieve a global mechanism where yielding occurs in all structural fuses and at the base of first‐story columns. However, existing seismic design provisions often struggle to fully satisfy the second principle due to the lack of a method for controlling failure modes. TPMC addresses this challenge by ensuring compliance with the second principle, grounding its approach in the kinematic method and the mechanism equilibrium curve within the rigid‐plastic analysis framework. By considering all potential story‐based undesirable mechanisms and calculating the required plastic moment of columns up to a target design displacement, TPMC ensures adherence to the second principle of the capacity‐based design approach, leading to the achievement of a global collapse mechanism. In this paper, an iterative method is proposed for designing beams and knee elements by considering plastic hinges at both ends of the beams, followed by a TPMC‐based methodology for designing columns to ensure a global mechanism. A parametric analysis of a single‐story single‐span MKF explores the effects of knee element geometry ( and ) on component demands. The results indicate that optimal parameter ranges of and can minimize the demands for MKF components. Practical design examples are illustrated using three steel MKFs, each consisting of four, seven, and ten stories with five spans. Pushover analysis and nonlinear dynamic analyses were performed to demonstrate the effectiveness of the proposed design procedure in ensuring the attainment of a global mechanism and excellent seismic performance under real ground motions.

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Optimal Design of Failure Mode Control for Semi-rigid Steel Frame Based on Elitist Retained Genetic Algorithm

Wang

Jian

et al. 2022

KSCE J Civ Eng

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Optimum Plastic Design of Moment Resisting Frames Using Mechanism Control

Cited by 8 publications

References 31 publications

Theory of plastic mechanism control: A new approach for the optimization of seismic resistant steel frames

Theory of plastic mechanism control: A new approach for the optimization of seismic resistant steel frames

Seismic design of steel moment‐resisting knee‐braced frame system by failure mode control

Optimal Design of Failure Mode Control for Semi-rigid Steel Frame Based on Elitist Retained Genetic Algorithm

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