Finding Critical Element in the Progressive Collapse of RC Structures Using Sensitivity Analysis

Farahani, Ahmad; Kheyroddin, Ali; Sharbatdar, Mohammad Kazem

doi:10.28991/cej-03091219

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…A similar element removal study in RC frames has been reported by [88] and discussed in Figure 2(h). Farahani et al (2018) [131] used the results of sensitivity analysis to identify the most critical elements within the RC structures whose elimination can trigger the collapse. They also modified the conventional pushdown analysis method by loading the entire structure gradually.…”

Section: Sensitivity Of Progressive Collapse Assessmentmentioning

confidence: 99%

Sensitivity analysis of reinforced concrete structures :

Sattar¹

2023

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Sensitivity analysis is a crucial step in computational mechanics and earthquake engineering. Sensitivity analysis of a model (either numerical or physical) aims at quantifying the relative importance of each input parameter, their potential interaction, and their effects on the model response. Sensitivity analysis has a long-term application in structural engineering more specifically on reinforced concrete RC structures. Many researchers benefited from the results of sensitivity analysis to reduce the uncertainty domain to those variables which are very important. This further helps in uncertainty quantification by accelerating the entire process. This state-of-the-art technical report provides a comprehensive review of classical sensitivity analysis techniques, followed by an in-depth review of all the related documents that implemented a full sensitivity analysis or partially adopted it for uncertainty quantification-related discussions. This review report on sensitivity analysis of reinforced concrete structures is a valuable contribution to the field of computational mechanics and earthquake engineering. This review highlights the importance of selecting an appropriate sensitivity analysis technique to achieve reliable results in structural analysis and design. By providing insights into the advantages and limitations of various sensitivity analysis techniques, this report can guide researchers, practitioners, and decision-makers in selecting the most appropriate technique for their specific applications. It is observed that the outcome of a sensitivity analysis depends heavily on the applied technique to perform the sensitivity assessment which eventually may cause a significant bias during the decision making. This report paves the road for better selection of a sensitivity analysis technique in problems related to structural and earthquake engineering. The findings of this review have significant implications for improving the accuracy and reliability of structural analysis, ultimately leading to safer and more resilient structures.

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Section: Sensitivity Of Progressive Collapse Assessmentmentioning

confidence: 99%

Sensitivity analysis of reinforced concrete structures :

Sattar¹

2023

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“…In this study, the progressive collapse resistance of the frames under threat-independent column loss scenarios was evaluated numerically. For this purpose, the sensitivity index was utilized, which is expressed as follows (Farahani et al, 2018;Jiang et al, 2020): λ 0 is the collapse load factor in the original state, in other words, λ 0 is the capacity ratio of the intact structure, defined as the ratio of the ultimate loading capacity to the applied load.…”

Section: Development Of the Numerical Modelmentioning

confidence: 99%

“…The importance and necessity of investigating progressive collapse were first recognized after the collapse of the Ronan Point Apartment Tower in England in 1968. Additionally, the collapses of the Skyline Towers Building in Virginia (1973), the Murrah Federal Building in 1995, and the World Trade Center collapse in 2001 are the worldwide known examples of progressive collapses (Farahani et al, 2018;Yi et al, 2021). Nowadays, due to the lack of land in large cities and population growth, high-rise buildings have received a lot of attention and their use is inevitable.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Progressive Collapse of the Reinforced Concrete Frames Considering the Soil–Structure Interaction: Parametric Study Based on the Sensitivity Index

Kakhki

Kheyroddin

Mortezaei

2022

Int J Concr Struct Mater

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In this essay, to investigate the progressive collapse of the reinforced concrete (RC) frames, a nonlinear static pushdown analysis was performed with column removal scenarios from the first story. At first, a numerical model was simulated and verified with the experimental model in SeismoStruct software without soil–structure interaction (SSI). Afterward, the foundation, soil, and the RC frame were modeled simultaneously in FLAC software and verified with the numerical model of the SeismoStruct software. Furthermore, the effect of SSI was studied on the progressive collapse of RC frames based on the sensitivity index (SI). The sensitivity index is defined as the ratio of the residual capacity under gravity loading of the structure by removing the column to the value of the undamaged structure. The results showed that by considering SSI, the sensitivity index decreases. Then, a parametric study of the framed structures (thickness of the foundation) and substructures (soil density, soil types, soil layers, and the soil saturation conditions) was performed to evaluate the progressive collapse-resisting capacity based on the sensitivity index. The results showed that by considering SSI, with an increase in the soil density and decrease in the groundwater level, the conditions would be better for preventing progressive collapse. It was also shown that rock and silty sands (SM), compared to other studied soil types, and SM and silty sands—silty clay with low plasticity—silty sands (SM-CL/ML-SM), compared to other studied soil layers, are better for preventing progressive collapse.

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Numerical Investigation of the Progressive Collapse of the Reinforced Concrete Wall-Frame Structures Considering the Soil–Structure Interaction

Kakhki

Kheyroddin

Mortezaei

2023

Int J Concr Struct Mater

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In this essay, the progressive collapse resistance of the reinforced concrete wall-frame structures was evaluated with and without considering the soil–structure interaction. The vulnerability of the frames against progressive collapse was investigated with the middle column removal scenario from the first story, based on the sensitivity index. To evaluate the effects of soil–structure interaction, the wall-frame structures along with the soil (hard soil) and foundation were simultaneously modeled in FLAC software and compared with the frames in Seismostruct software. The results showed that the sensitivity index decreased by considering the soil–structure interaction in the wall-frame structures. Afterward, a parametric study of the structures (foundation thickness) and substructures (soil types, soil densities, soil saturation conditions and soil layers) was performed. The results showed that with an increase in thickness of the foundation, the sensitivity index increased, and therefore, the condition of the structure would be more critical against progressive collapse. It was found that high groundwater levels in the subsoil can reduce its bearing capacity and lead to the damage to the structure. In addition, it was determined that by changing the substructure soil type from type 4 (Clay-MC) to type 1 (Rock), the use of layer 1 (SM) and layer 2 (SM-CL/ML (Very hard clay)-SM), and the soils with high density, the condition of the structures is better to prevent progressive collapse.

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Finding Critical Element in the Progressive Collapse of RC Structures Using Sensitivity Analysis

Cited by 3 publications

References 30 publications

Sensitivity analysis of reinforced concrete structures :

Sensitivity analysis of reinforced concrete structures :

Evaluation of the Progressive Collapse of the Reinforced Concrete Frames Considering the Soil–Structure Interaction: Parametric Study Based on the Sensitivity Index

Numerical Investigation of the Progressive Collapse of the Reinforced Concrete Wall-Frame Structures Considering the Soil–Structure Interaction

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