Progressive Collapse Analysis of Cable-Stayed Bridges

Naji, Arash; Ghiasi, Mohammad Reza

doi:10.1007/s11668-019-00649-3

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…In displacement control analysis, after modeling the structure without the intended column, the displacement of the column removed point is increased gradually until the demand displacement is reached. For each displacement, the corresponding load is calculated (Naji and Ghiasi, 2019).…”

Section: Robustness Of Structures Against Progressive Collapsementioning

confidence: 99%

Robustness of steel moment frames against progressive collapse by means of plastic limit analysis

Naji

2019

IJSI

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Purpose Progressive collapse refers to a phenomenon, in which local damage in a primary structural component leads to total or partial structural system failure, without any proportionality between the initial and final damage. Robustness is a measure that demonstrates the strength of a structure to resist progressive collapse. Static pushdown and nonlinear dynamic analysis were two main procedures to calculate the capacity of structures to resist progressive collapse. According to previous works, static analysis would lead to inaccurate results. Meanwhile, capacity analysis by dynamic analysis needs several reruns and encountering numerical instability is inevitable. The purpose of this paper is to present the formulation of a solution procedure to determine robustness of steel moment resisting frames, using plastic limit analysis (PLA). Design/methodology/approach This formulation utilizes simplex optimization to solve the problem. Static pushdown and incremental dynamic methods are used for verification. Findings The results obtained from PLA have good agreement with incremental analysis results. While incremental dynamic analysis is a very demanding method, PLA can be utilized as an alternative method. Originality/value The formulation of progressive collapse resistance of steel moment frames by means of PLA is not proposed in previous research works.

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Section: Robustness Of Structures Against Progressive Collapsementioning

confidence: 99%

Robustness of steel moment frames against progressive collapse by means of plastic limit analysis

Naji

2019

IJSI

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“…Over time, these factors develop cracks and defects in bridge structures. In some cases, the development of cracks can serve as an early indicator of more severe problems that start with localized damage and progress through a chain reaction mechanism that can ultimately lead to structural failure [1][2][3]. Detecting defects during their initial stages is critical for diagnosing damage and facilitating timely repairs and retrofitting operations [4].…”

Section: Introductionmentioning

confidence: 99%

Multi-Span Box Girder Bridge Sensitivity Analysis in Response to Damage Scenarios

Brinissat,

Ray,

Kuti

2024

Buildings

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Due to their distinct features, including structural simplicity and exceptional load-carrying capacity, steel box girder bridges play a critical role in transportation networks. However, they are categorized as fracture-critical structures and face significant challenges. These challenges stem from the overloading and the relentless effects of corrosion and aging on critical structural components. As a result, these bridges require thorough inspections to ensure their safety and integrity. This paper introduces generalized approaches based on vibration-based structural health monitoring in response to this need. This approach assesses the condition of critical members in a steel girder bridge and evaluates their sensitivity to damage. A rigorous analytical evaluation demonstrated the effectiveness of the proposed approach in evaluating the Szapáry multi-span continuous highway bridge under various damage scenarios. This evaluation necessitates extensive vibration measurements, with piezoelectric sensors capturing ambient vibrations and developing detailed finite element models of the bridge to simulate the structural behavior accurately. The results obtained from this study showed that bridge frequencies are sufficiently sensitive for identifying significant fractures in long bridges. However, the mode shape results show a better resolution when compared to the frequency changes. The findings are usually sensitive enough to identify damage at the affected locations. Amplitude changes in the mode shape help determine the location of damage. The modal assurance criterion (MAC) served to identify damage as well. Finally, the results show a distinct pattern of frequency and mode shape variations for every damage scenario, which helps to identify the damage type, severity, and location along the bridge. The analysis results reported in this study serve as a reference benchmark for the Szapáry Bridge health monitoring.

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A Single-Story Analogy to Estimate Progressive Collapse Displacement of Steel Moment Frames

Naji

2019

J Fail. Anal. and Preven.

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Progressive Collapse Analysis of Cable-Stayed Bridges

Cited by 7 publications

References 31 publications

Robustness of steel moment frames against progressive collapse by means of plastic limit analysis

Robustness of steel moment frames against progressive collapse by means of plastic limit analysis

Multi-Span Box Girder Bridge Sensitivity Analysis in Response to Damage Scenarios

A Single-Story Analogy to Estimate Progressive Collapse Displacement of Steel Moment Frames

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