Progressive Collapse Analysis of Reinforced Concrete Structures: A Simplified Procedure

Naji, Arash; Rohani, Mohamadreza

doi:10.24018/ejers.2017.2.10.474

Cited by 8 publications

(1 citation statement)

References 15 publications

(16 reference statements)

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“…The collapse of a 22-story building in Ronan Point, London (UK), as a result of gas explosion in 1968, first attracted the attention of engineers to this phenomenon (McGuire, 1974; Leyendecker and Ellingwood, 1977). The Alfred P. Murrah Federal Building bombing in 1995 in Oklahoma City (USA) and the destruction of the World Trade Center, in New York (USA) in 2001, accelerated research works in this area (Naji and Rohani, 2017; Yi et al , 2008; Alashker and El-Tawil, 2011; Dat and Hai, 2011; Naji and Irani, 2012; Elsanadedy et al , 2014; Naji, 2018a, b, 2019a).…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

Naji

2019

IJSI

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Analysis of RC structures with different design mistakes under explosive based demolition

Özmen¹,

Soyluk

2020

Structural Concrete

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Most of the RC buildings in Turkey have reached the end of their economic lifespan, so urban transformation studies have been accelerated in recent years. Considering the fact that these buildings do not meet the construction regulations and have structural defects in terms of earthquake resistance is concluded the necessity of renewal of this building stock. For this reason, it is needed to study the explosive based demolition technique, which have been widely used in the future in Turkey. The aim of this study is to analyze the structural behavior of buildings planed for demolition by using explosive materials and demonstrating the effect of structural faults on the demolition process. In this context, the effect of structural defects on structural behavior is investigated under explosive based demolition for a typical RC framed building model. Within the scope of the study, it is aimed to investigate the effects of design errors frequently encountered in reinforced concrete structures during the demolition of the building using explosives. The main objective of the study is to determine the effects of design errors, which may be present in the building on important results such as demolition of reinforced concrete structures that are planned to be demolished in two different types using an explosive inside or towards a selected direction, distribution of the parts scattered after demolition and the demolition time. In this way, it is aimed to prevent accidents or unwanted demolition patterns that may occur in demolition works of reinforced concrete structures with design errors. A 12‐storey square building in plan with 6x6 axles (5 m axle opening) is selected as a structural system. The selected structure has been designed with Ide Static Structural Analysis Program. The same structure is also modeled with extreme loading for structures (ELS) program for low concrete strengths, reinforcement defects, and locally located structural defects considering inside and side demolition used explosives. All building models have been subjected to the same blast planning. It is observed that reduced the concrete strength and reinforcement faults shorten the time of destruction of buildings scheduled for demolition by using explosive materials and all the structural defects effect the debris affecting area. It is generally concluded that, all the structural defects are affective on the structural behavior of buildings under explosive based demolition.

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Progressive Collapse Analysis of Cable-Stayed Bridges

Naji

Ghiasi

2019

J Fail. Anal. and Preven.

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Progressive Collapse Analysis of Reinforced Concrete Structures: A Simplified Procedure

Cited by 8 publications

References 15 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

Analysis of RC structures with different design mistakes under explosive based demolition

Progressive Collapse Analysis of Cable-Stayed Bridges

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