The influence of coupled horizontal–vertical ground excitations on the collapse margins of modern RC-MRFs

Farsangi, Ehsan Noroozinejad; Tasnimi, Abbas Ali

doi:10.1007/s40091-016-0122-0

Cited by 28 publications

(6 citation statements)

References 36 publications

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“…Similarly, the seismic fragility of high-rise RC frame-core wall buildings has been scrutinized through the IDA procedure, yet the risk of collapse has been neglected (Taslimi et al, 2021). Calculating the collapse margins and mean annual frequency of collapse of RC-MRFs under multi-component near-field records revealed the fact that ignoring the vertical component in analysis leads to the under-estimation of collapse risk because of its influence on the local and global performance of the buildings (Farsangi and Tasnimi, 2016). Despite this attempt to highlight the effects of vertical earthquake waves on the collapse risk, this study is limited only to RC frames, so the performance of shear or core walls remained obscure.…”

Section: Introductionmentioning

confidence: 99%

The effect of vertical near-field ground motions on the collapse risk of high-rise reinforced concrete frame-core wall structures

Taslimi

Tehranizadeh

2021

Advances in Structural Engineering

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According to the observations of past earthquakes, the vertical ground motions have had a striking influence on the engineering structures, especially reinforced concrete ones. Nevertheless, the number of studies on their aftermath is insufficient, and despite some endeavors done by researchers, there is still a shortage of knowledge about the inclusion of vertical excitation on the seismic performance and the collapse probability of RC buildings. Hence, the variation in the collapse risk of three high-rise RC frame-core wall structures when they undergo bi-directional ground motions is discussed. In this paper, incremental dynamic analyses are carried out under two circumstances, including the horizontal (H) and the combined horizontal and vertical (H+V) earthquakes, and the seismic fragility curves are derived. The inter-story drift ratio corresponding to the onset of collapse has also been defined. The buildings collapse risk under the two circumstances is obtained from the risk integral. Results indicate that in the H+V state, structures meet the collapse criteria for lower intensity measures. Thus, the collapse risk increases as the structures are subjected to bi-directional seismic loads, and the consideration of this effect leads to a more accurate evaluation of buildings seismic performance.

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Section: Introductionmentioning

confidence: 99%

The effect of vertical near-field ground motions on the collapse risk of high-rise reinforced concrete frame-core wall structures

Taslimi

Tehranizadeh

2021

Advances in Structural Engineering

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“…Recently, with the increasing interest in the effect of vertical ground excitations, researchers have begun to pay more attention to civil structures subjected to such effects. Farsangi and Tasnimi evaluated the coupled effect of horizontal–vertical ground motions on the collapse margins of modern reinforced concrete‐moment resisting frames. The result indicated that vertical ground motion has a significant impact on both local and global structural response and cannot be neglected.…”

Section: Introductionmentioning

confidence: 99%

Influence of shear‐axial force interaction on the seismic performance of a piloti building subjected to the 2017 earthquake in Pohang Korea

Dang-Vu

Lee

Shin

et al. 2019

Structural Concrete

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This study aims to investigate the influence of shear‐axial force interaction on the seismic performance of a piloti‐type building subjected to the Pohang earthquake. For this purpose, a four‐story piloti‐type building in Pohang, Korea whose columns were brutally damaged by the 2017 Pohang earthquake, one of this country's strongest earthquakes in modern history, was chosen as the object of the study. Columns of this piloti‐type building were designed with insufficient transverse reinforcement, resulting in an increased potential for shear‐axial failure. The piloti‐type building was simulated using Zeus‐NL, an efficient analysis and simulation platform developed for earthquake engineering applications to perform nonlinear time history analysis. A hysteretic shear model in Zeus‐NL capable of accounting for the variation in column axial force was adopted to capture the effect of the shear‐axial force interaction, caused by a combination of horizontal and vertical ground motions. The shear model was validated by comparing the simulated and experimental results. The seismic performance of the piloti‐type building under the effect of the shear‐axial force interaction was compared with that under the shear effect only. Results have indicated that shear effect and shear‐axial force interaction effect significantly reduce column maximum shear force and increase column drift demand. The influence is more intense considering shear‐axial interaction. The seismic response in terms of hysteretic behavior, energy dissipation, and stiffness degradation is presented and discussed.

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“…Further, seismic vulnerability assessment of the structural models is modelled with and without infill and analyzed using CSM, and IDA approaches [13,14]. Seismic vulnerability of a structure is defined as proneness to damage under seismic excitation for a given intensity measure [1,[15][16][17][18][19][20]. It is expressed as a relationship between intensity measure and damage measure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Real Ground Motion Records in Performance Assessment of RC Buildings

Oggu

Pithadiya

Gopikrishna

2019

IJE

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Reinforced concrete frame buildings with Open Ground Story (OGS) are one of the most common building configurations in urban habitat. These configurations are known to be vulnerable to seismic excitations, primarily due to the sudden loss in strength in the ground story and differential stiffness distribution throughout the structure. The differential stiffness distribution is attributed primarily to the interaction of non-structural infill wall with the moment-resisting frame. Hence, the interaction of infill wall needs to be accounted in estimating the seismic vulnerability. Therefore, the present investigation is focused on understanding the impact of utilizing real ground motion records on the performance assessment of RC buildings with and without consideration of infill walls. Fragility curves were developed for low and mid-rise structural models using Capacity Spectrum Method (CSM) specified by ATC-40 and with Incremental Dynamic Analysis (IDA). CSM uses the response spectrum specified by the respective code, unlike IDA where an ensemble of spectrum compatible real ground motion accelerograms satisfying the necessary site conditions is used in assessing the performance. Further, significant variations observed in the developed fragility curves by CSM and IDA emphasizes the sensitivity of real ground motion data in performance assessment.

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The influence of coupled horizontal–vertical ground excitations on the collapse margins of modern RC-MRFs

Cited by 28 publications

References 36 publications

The effect of vertical near-field ground motions on the collapse risk of high-rise reinforced concrete frame-core wall structures

The effect of vertical near-field ground motions on the collapse risk of high-rise reinforced concrete frame-core wall structures

Influence of shear‐axial force interaction on the seismic performance of a piloti building subjected to the 2017 earthquake in Pohang Korea

Influence of Real Ground Motion Records in Performance Assessment of RC Buildings

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