Acceleration demands in single-storey RC buildings with flexible diaphragms

Ruggieri, Sergio; Vukobratović, Vladimir

doi:10.1016/j.engstruct.2022.115276

Cited by 35 publications

(8 citation statements)

References 37 publications

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“…However, there is still uncertainty whether spectral shape-based IMs will be better estimators of the structural response when used as the first component in vector-valued IMs. This is precisely the aim of our future research with the implementation of new IMs and EDP as the reported for [40,41]. Finally, the fragility surfaces can be used for the seismic risk evaluation of buildings as we have seen in [42].…”

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confidence: 84%

Vector-Valued Intensity Measures Based on Spectral Shape to Predict Seismic Fragility Surfaces in Reinforced Concrete Buildings

et al. 2023

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Although some studies have been conducted to compute fragility surfaces of buildings using vector-valued seismic intensity measures (IMs), in all the cases, the first component of the vector usually is the spectral acceleration at first mode of vibration of the structure Sa(T1). In this study, fragility surfaces of three reinforced concrete buildings (RCB) subjected to narrow-band ground motions obtained from soft soil of Mexico City are computed considering vector-valued IMs based not only on Sa(T1), but also the velocity V(T1), pseudo-velocity Sv(T1), and normalized input energy by the mass EI/m(T1) as the first component. As second component of the vector-valued IMs, the Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV), effective duration (tD), earthquake damage potential (ID) and four Np spectral shape-based parameters obtained through spectral acceleration (NpSa), velocity (NpV), pseudo-velocity (NpSv), and input energy (NpEI) have been analyzed. In order to obtain fragility surfaces, Multinomial Logistic Regression (MLR) was applied. It is observed that those vector-valued IMs based on the spectral shape proxies were more efficient to predict the probability of failure of RCB. For this reason, it is important to consider spectral shape vector-valued IMs in order to reduce uncertainty in the structural response of buildings under earthquakes. Thus, the use of two parameters instead of a single intensity measure improves the efficiency. Moreover, the fragility surfaces can be used for the seismic risk evaluation of buildings.

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confidence: 84%

Vector-Valued Intensity Measures Based on Spectral Shape to Predict Seismic Fragility Surfaces in Reinforced Concrete Buildings

et al. 2023

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“…Another effect to consider when conducting the seismic analysis of these buildings relates to the eccentricity resulting from inadequate stiffness distribution, due to not paying attention to the location of the shear walls, potentially creating serious torsional issues [13][14][15]. Lastly, but no less important, is the deformability of the slabs, especially when there is no presence of beams coupling the shear walls [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Evaluating Seismic Performance in Reinforced Concrete Buildings with Complex Shear Walls: A Focus on a Residential Case in Chile

Aguayo,

Carvallo,

Vielma

2024

Buildings

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This study employs a non-linear static analysis, known as pushover analysis, to explore the flexural-compressive behavior of complex shear walls within a reinforced concrete (R.C.) structure, adhering to contemporary design standards in Chile. The primary objective is to assess the initiation of damage as the building approaches the limit states outlined in Achisina’s seminal “Performance Based Seismic Design” framework. To achieve this, a sophisticated fiber model, accounting for the confined behavior of concrete derived from the structural elements’ detailing, has been uniformly integrated across the building’s entire height. Furthermore, the analysis incorporates a rigid diaphragm to simulate the R.C. slab’s response accurately. The study implements the N2 method, adjusting for seismic demands in an acceleration-displacement format, which leverages the displacement spectrum defined by Supreme Decree 61, a legislative response to the 8.8 Mw Maule earthquake in 2010. The findings reveal that the analyzed structure meets the immediate occupancy performance level with drifts nearing 5‰ in the symmetrical Y direction. This outcome aligns with prior assessments of Chilean R.C. wall buildings. However, in the asymmetric X direction, the structure exhibits a higher degree of structural damage, aligning with a life safety performance level. This differentiation underscores the critical need for nuanced understanding and modeling of structural behavior under seismic loads, contributing to the ongoing refinement of seismic design practices and standards.

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“…The floor slabs, which are rigid and flexible, play a significant role in the seismic behavior of concrete structures. It is well-known that the main role of a floor system is to distribute loads acting on a horizontal system to the underlying elements in accordance with the stiffness of vertical elements (e.g., columns, walls) [8]. The hypothesis is valid only if a floor is infinitely rigid in its own plane, but it may not always be on the safe side [8].…”

Section: Introductionmentioning

confidence: 99%

“…It is well-known that the main role of a floor system is to distribute loads acting on a horizontal system to the underlying elements in accordance with the stiffness of vertical elements (e.g., columns, walls) [8]. The hypothesis is valid only if a floor is infinitely rigid in its own plane, but it may not always be on the safe side [8]. Figure 2 shows a case of a building on an additional floor of a building in Albania and what happened during an earthquake in 2019.…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of Reinforced Concrete Frames with Added Floors: Emphasizing the Influence of Structural Joints in the Context of Sustainable Vertical Extensions

Shala,

Bleiziffer

2024

Buildings

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The size of the population and the need for residential spaces are increasing. One possible solution is to add new floors to existing buildings. This research examines the seismic behavior of reinforced concrete frame structures that have undergone vertical extensions by adding extra floors. The primary focus is on the joints that connect these extensions to the existing structure and the appropriate modeling of these joints. However, adding floors to existing structures might be structurally challenging, especially in terms of the behavior under seismic actions. This paper presents a numerical study of a reinforced concrete frame in an old building to which new floors are subsequently added. The analysis shows that the frame does not behave as a whole with the old part of the structure, nor does it behave the same as if it were made with rigid joints compared to additional ones connected using hinge joints. It is noted that in structural analyses, the connection between an existing structure and a vertical extension is often considered rigid, yet in practice, these joints may behave differently. The change from the corner (knee) joint to the external joint has its own effect on the distribution of internal forces in the structure as a whole and in the joint in particular. Compared to demolishing and rebuilding, vertical extension is considered environmentally friendly, reducing the financial costs, environmental pollution, and waste generation.

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Acceleration demands in single-storey RC buildings with flexible diaphragms

Cited by 35 publications

References 37 publications

Vector-Valued Intensity Measures Based on Spectral Shape to Predict Seismic Fragility Surfaces in Reinforced Concrete Buildings

Vector-Valued Intensity Measures Based on Spectral Shape to Predict Seismic Fragility Surfaces in Reinforced Concrete Buildings

Evaluating Seismic Performance in Reinforced Concrete Buildings with Complex Shear Walls: A Focus on a Residential Case in Chile

Seismic Performance of Reinforced Concrete Frames with Added Floors: Emphasizing the Influence of Structural Joints in the Context of Sustainable Vertical Extensions

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