Response modification factors for seismic design of steel Fiber Reinforced Concrete segmental tunnels

Avanaki, Mohammad Jamshidi

doi:10.1016/j.conbuildmat.2019.03.275

Cited by 17 publications

(3 citation statements)

References 14 publications

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“…However, these methods can be computationally expensive and require significant modeling effort, making them less practical for rapid assessment or design iterations. Notably, while detailed analyses have been conducted to investigate the effect of ductility on structural components and to propose related response modifications (Abou-Elfath et al 2018;Jamshidi Avanaki 2019;Güner and Topkaya 2020), similar comprehensive studies focusing on the ductility of NSC attachments are still lacking in the literature.…”

Section: Introductionmentioning

confidence: 99%

Proposed Reliable Peak Component Factors for Ductile Light NSCs Subjected to Horizontal Ground Motions

Mehrjoo,

Assi

2024

Preprint

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This paper aims to propose reliable factors that accurately capture the effect of target ductility of non-structural components (NSCs) on floor acceleration, velocity, and displacement demands at both the ground level and the upper building floors. A linear time history analysis (THA) was performed on four moment-resisting archetype buildings using historical and synthetic ground motions matched to the Montreal Site Class C uniform hazard spectrum (UHS) through frequency domain matching. The NSCs’ seismic demands and ductility-based modification factors were determined using the uncoupled analysis approach, in which the equations of motion were solved using the Iterative Newmark Integration approach implemented in MATLAB. The seismic floor acceleration, displacement, and velocity demand amplitudes were reduced with increased NSC ductility, especially inside the resonance period range. The effect of ductility on the seismic acceleration demands was found to be significant near the resonance condition for the first three primary periods of the supporting structure. Conversely, the displacement and velocity demand were predominantly affected by the first primary mode. Specifically, for NSCs with moderate to high ductility levels, a 40%-60% decrease in demand was observed as compared to NSCs exhibiting elastic behavior in the resonance condition. On the other hand, the effect of ductility was minimal for out-of-resonance conditions. Also, it was found that the ductility had a minor impact on ground-level seismic demands. It is concluded that while ductility minimizes the impact of the resonance condition on NSCs, a trade-off between the benefits of ductility and an acceptable damage level must be considered.

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Section: Introductionmentioning

confidence: 99%

Proposed Reliable Peak Component Factors for Ductile Light NSCs Subjected to Horizontal Ground Motions

Mehrjoo,

Assi

2024

Preprint

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“…One is the design of thermal insulation and shock absorption, which is to reduce the energy when an earthquake occurs through the thermal insulation layer, and prevent the high temperature of surrounding rock from transferring to the secondary lining structure (Kang et al, 2020;Suzuki et al). The second is the reinforcement of structure and surrounding rock, which is to reduce the tunnel damage of thermal seismic coupling by appropriately improving the stiffness, toughness, and crack resistance of lining and surrounding rock (Cui & Ma, 2021b;Jamshidi Avanaki, 2019). At present, there are few researches on the control technology of tunnel failure under thermal seismic interaction and mainly focuses on the structure reinforcement and the design of thermal insulation efficiency under a single factor of temperature or earthquake (Bilotta, 2018;Corigliano et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Application of thermal insulation layer in the tunnel with high temperature subjected to strong seismic motion

Cui

2021

All Earth

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Tunnels with high-temperature rocks are built in seismically active areas, which may suffer heavy damages in earthquakes. This paper aims to explore the thermal insulation effect and seismic isolation effect layer of the thermal insulation layer in high-temperature tunnels. Firstly, taking Jiwoxiga tunnel in Tibet, China as the research background, the finite difference models are established to investigate temperature fields, seismic response, and structural safety of the tunnel. Then, the two most commonly used insulation layers are applied to the support structure to study the thermal insulation effect and seismic isolation effect of the layers. Besides, the effect of factors including the thickness, elastic modulus, surrounding rock, and boundary temperature on the application of the layer are investigated in detail. The result shows that the application of the thermal insulation layer has isolated the geothermal and seismic motion propagating from the rock to linings, thus improving the structural safety of the high-temperature tunnel when encountering strong earthquakes. The thermal insulation effect of the layer in the high-temperature tunnel enhances with the increasing thickness of the layer, and its seismic isolation behaviour enhances with the increasing of the layer thickness and elastic modulus.

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“…In an effort to facilitate the seismic design of SFRC segmental tunnels, Jamshidi Avanaki [24] investigated the seismic ductility properties of such tunnels and derived R-factors for their seismic design.…”

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confidence: 99%

Fiber Reinforced Concrete Segmental Tunnels in Seismic Regions

Avanaki

2019

CERJ

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The ever-growing construction sector is considered as one of the main propellers of economy, especially in developing countries. Tunnels are one of the vastly developed infrastructures in which public and private sectors build and invest for various purposes, e.g. transport, water supply, and so on. In this regard, approaches to increase feasibility and performance of tunnels are developed to meet specific requirements. Introduction and usage of fibrous materials to strengthen mortar matrix, i.e. primarily decrease crack development and propagation, dates back to centuries ago [1]. In modern construction practice, fibers of different materials (steel, carbon, glass, polypropylene, …) are used to increase the post-crack tensile strength and flexural properties of the concrete mortar [1-3], known as Fiber Reinforced Concrete (FRC). The design framework for fiber reinforced concrete structural elements are standardized and introduced in recent design codes and regulations [4][5][6].

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Response modification factors for seismic design of steel Fiber Reinforced Concrete segmental tunnels

Cited by 17 publications

References 14 publications

Proposed Reliable Peak Component Factors for Ductile Light NSCs Subjected to Horizontal Ground Motions

Proposed Reliable Peak Component Factors for Ductile Light NSCs Subjected to Horizontal Ground Motions

Application of thermal insulation layer in the tunnel with high temperature subjected to strong seismic motion

Fiber Reinforced Concrete Segmental Tunnels in Seismic Regions

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