Fragility and robustness analysis of a multistorey RC building

doi:10.14256/jce.3036.2020

Cited by 3 publications

(5 citation statements)

References 41 publications

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“…This probability was corrected to better account for the curvature of the limit state Figure 2. The probability of failure is estimated by (5) The reliability index was calculated as the shortest distance between the origin and the failure surface, where -space:…”

Section: B) Sorm Methodsmentioning

confidence: 99%

“…The design of reinforced concrete columns is an axis of research that has received much attention in recent years. Several experimental [1][2][3][4] and numerical studies on reinforced concrete portal frame elements [5][6][7][8][9][10][11] have been conducted to explore the behaviour of portal frame elements. Alfarah et al [10] presented a new methodology for calculating the evolution of the damage variables on two portal frames.…”

Section: Introductionmentioning

confidence: 99%

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Effects of column damage on the reliability of reinforced concrete portal frames

Lakušić¹

2023

JCE

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The reliability and behaviour of columns belonging to portal-reinforced concrete frames depend on many factors. This paper presents a parametric study of a reliability column in a non-linear domain, considering mechanical variability and targeting damaged areas of the reinforced concrete columns. In this study, an adaptive method for assessing the reliability of columns with respect to damage states is proposed. The method is an indirect coupling of the response surface and finite element model in the non-linear domain. The main goal of this study was to provide a structural engineer with a modelling approach for optimal and robust column design. The results of the present study show that the reliability of columns belonging to portal frames is closely related to the quality of the constituent materials (steel and concrete) and the type of load applied. The reliability of this type of column also decreases with increasing load and applied displacement and increases with increasing compressive strength and yield strength of the steel. The uncertainties associated with the structural models are considered, with their impact on structure reliability studied using a sensitivity analysis, which allows the proposed approach to make the best possible decision for a better design and, therefore, good behaviour under different parameters.

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Section: B) Sorm Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of column damage on the reliability of reinforced concrete portal frames

Lakušić¹

2023

JCE

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“…In both NSA and NDA procedures, loading of the structure and the column removal scenario in the NDA are done according to the [11,12] provisions. This procedure [11,12] is described in detail in [13].…”

Section: Loads and Actionsmentioning

confidence: 99%

“…To avoid the overlapping of the fragility functions, their correction is performed by adopting the same standard deviation value for all LS, using the MLE method described in [1,22]. Another method to avoid the overlapping of the fragility functions is suggested and discussed in [13]. and for uncorrected and corrected fragility curves are shown in Table 3 and robustness fragility curves are displayed in Fig.…”

Section: Calculation Of Fragility Curvesmentioning

confidence: 99%

Robustness and Fragility of the Rc Building Designed According to Yu-81 and European Standards

Čokić¹,

Folić²,

Folić³

2021

1st Croatian Conference on Earthquake Engineering

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In the countries of the former Yugoslavia, the first regulations for the design of seismically resistant structures date back to 1964, and the reason for their adoption was the Skopje earthquake in 1963. The next, much more advanced structural code dates from 1981 with a few additions. Many RC multistorey buildings were designed and built according to the mentioned code for high-rise buildings from 1981, especially in larger cities. Some of the reasons were that they are mainly calculated according to their bearing capacity and global displacements values, and not according to the interstory lateral deformations. However, there was no possibility to correlate their reliability to resist earthquake actions with modern International documents (starting from ATC 40 (1996) -until the latest one from 2017, EC 8-part 3, FEMA 273, etc.), nor was it checked later. Recent earthquakes, including the Montenegrin (1979) earthquake, shortly before the 1981 Regulations, showed the vulnerability and even progressive collapse of reinforced concrete (RC) structures. In many countries, for more significant structures, an assessment of their condition from the aspect of vulnerability and/or robustness is performed. It is significant that many seismically resistant structures have shown less sensitivity to progressive collapse because their integrity is, to some extent, a barrier against the occurrence of progressive collapse. Such analyses precede the reinforcement detailing of existing structures to the calculated seismic action characterized, above all, by the intensity and return period. In this paper, a brief application of nonlinear modern methods of analysis and reliability assessment of these structures, with risk analysis according to the performance limit states of the building is performed. The robustness and seismic fragility of two models of an RC building with the same geometric characteristics were analysed, with one building designed according to European building design standards and the other according to Yugoslav regulations from 1981. The goal was to establish the difference in the performance of the two structures, because there is a large number of a reinforced concrete buildings designed by applying old codes in this region. The methodology of calculation and design of RC buildings, necessary for the mentioned analyses, is described in the paper. Numerical analyses were conducted on RC building designed according to Yugoslav standards from 1981 and according to the mentioned modern norms (Eurocode) with a comparison of the important indicators in the obtained results.

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“…When wind direction is oblique to the leading edge, conical vortices form [5] and give rise to increased wind loads. These two coherence structures on the roof, resulting in peak suction (extreme negative pressure), can cause severe damage to structures and can even result in overturning of the entire roof when the roofing system lacks sufficient strength [6,7]. Moreover, the complex vortex structures acting on the low-rise building always cause non-uniform distribution of the wind pressure on the roof.…”

Section: Introductionmentioning

confidence: 99%

Effect of roof heights on dynamic characteristics of wind pressure on square low-rise buildings

2022

JCE

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The high suction induced by strong wind on a flat roof can result in severe local damage or even in the overturning of the entire roof. The roof height has a significant effect on characteristics of the high wind suction force. The wind pressure on flat roofs of various heights is investigated in this paper. The extreme wind pressure and its position are firstly studied at different wind incidence angles. Proper orthogonal decomposition (POD) and coherence function analyses are then conducted to analyse dynamic characteristics. The results show that the local extreme pressure increases with an increase in roof height. The fluctuation of the separation bubble also increases, and there exists a mode competition of the first two POD modes. On the contrary, the roof height has fewer effects on conical vortices. In addition, two coherent regions (conical vortices) are observed on the roof. Although these two regions have small correlation coefficients, they have a considerably high coherence function at low frequency. These results are expected to contribute to better understanding of high suction characteristics on flat roofs, and can potentially provide guidance for avoiding roof damage induced by strong wind suction.

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Fragility and robustness analysis of a multistorey RC building

Cited by 3 publications

References 41 publications

Effects of column damage on the reliability of reinforced concrete portal frames

Effects of column damage on the reliability of reinforced concrete portal frames

Robustness and Fragility of the Rc Building Designed According to Yu-81 and European Standards

Effect of roof heights on dynamic characteristics of wind pressure on square low-rise buildings

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