The seismic performance of tunnel-form buildings with a non-uniform in-plan mass distribution

Mohsenian, Vahid; Nikkhoo, Ali; Rostamkalaee, S; Moghadam, Abdolreza S.; Hejazi, Farzad

doi:10.1016/j.istruc.2020.11.063

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…The plan illustrated in Figure 5, which is regular and symmetric in both main directions (x and y), was employed in this study to perform the numerical analyses (Mohsenian, 2013). The dashed lines in the plan denote the coupling beams (spandrels) with the length and height equal to 1.0 m and 0.7 m, respectively (L n and h in Figure 6).…”

Section: Specifications Of the Studied Modelsmentioning

confidence: 99%

“…Several studies have been also performed on the effects of accidental torsions due to eccentricities of centers of mass, strength, or stiffness, on the seismic performance of tunnel-form building structures (Mohsenian and Mortezaei, 2018; Mohsenian et al, 2018, 2021a; Mortezaei and Mohsenian, 2022). In general, the outcomes of these studies indicate that the accidental torsions have no significant influence on the performance level of these systems.…”

Section: Introductionmentioning

confidence: 99%

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A low computational cost seismic analyses framework for 3D tunnel-form building structures

Mohsenian

Nikkhoo

Hajirasouliha

et al. 2022

Advances in Structural Engineering

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Numerical modeling of tunnel-form buildings entails the utilization of 3D finite element models consisting of large numbers of shell and fiber elements. Accordingly, the non-linear analysis of such models under seismic excitations is both time-consuming and computationally expensive, especially in the case of large scale structures. To address this challenge, this study investigates the efficiency of the Endurance Time Method (ETM) to evaluate the structural responses, location of damage initiation, and the overall performance of tunnel-form structures under the Design Basis Earthquake (DBE) hazard level. Comparison with results derived from pushover and time-history analyses indicated the acceptable accuracy of ETM with significantly less computational efforts. The computation time required for the ETM was less than 25% of pushover (until total failure of the system) and time history analyses on the five- and ten-story tunnel-form buildings. The maximum differences between the results of ETM and time history analysis used to estimate the story drifts and shear forces were 4–6% and 1–4.5%, respectively. Considering the reliability of ETM and its appropriate accuracy, this method can be considered as a suitable alternative to the conventional methods to provide a low computational cost seismic analyses framework for non-linear tunnel-form buildings and similar structural systems.

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Section: Specifications Of the Studied Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A low computational cost seismic analyses framework for 3D tunnel-form building structures

Mohsenian

Nikkhoo

Hajirasouliha

et al. 2022

Advances in Structural Engineering

Self Cite

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“…This torsion is transferred to the vertical load-carrying members as an additional shear force. In order to determine the torsional effect realistically, the positions of the mass and rigidity center must be determined accurately [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Rigidity Center

2023

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It is known that when a reinforced concrete building exposed to a horizontal load is subjected to torsional moments around its center of rigidity, additional shear stresses occur in the vertical load-carrying elements, such as the columns and shear walls. Therefore, in order to estimate the additional stresses caused by the torsion, the rigidity center should be calculated precisely. It is known that there are several analytical approaches to calculating the rigidity center location. These approaches do not calculate the rigidity centers close to each other in asymmetric buildings. As significant differences were observed in the calculation of the rigidity center using analytical methods, it was decided to seek verification by conducting an experimental study. In order to calculate and verify the location of the rigidity center, an extensive experimental study was planned. A total of 20 scaled and revised buildings were built, and they were tested in the specially designed test setup. The tested buildings had square, rectangular and irregular floor plans. In addition, vertical load-carrying members were either symmetrically placed on the floor plan or kept asymmetrical to see the effect of their location on the rigidity center. All the buildings were tested under their self-weight, and the corresponding displacements were recorded. Additionally, all the buildings were modeled using ETABS to verify the theoretical background of the rigidity center. From the test results, it was found that the resultant shear force can be calculated by multiplying the displacements of each member of a given story found from the tests on its bending stiffness, and this will give the location of the rigidity center. The rigidity center was found to be identical to the results obtained from the 3D model analysis using ETABS, although it uses a different procedure. As the results from the experiment and 3D model are close to each other, it can be said that the rigidity center of reinforced concrete buildings can be found from simple tests using any material that has almost uniform mechanical properties.

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Development of analytical seismic fragility functions for the common buildings in Iran

Zadeh

Ghafory‐Ashtiany

Kalantari

et al. 2022

Bull Earthquake Eng

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The seismic performance of tunnel-form buildings with a non-uniform in-plan mass distribution

Cited by 7 publications

References 23 publications

A low computational cost seismic analyses framework for 3D tunnel-form building structures

A low computational cost seismic analyses framework for 3D tunnel-form building structures

Experimental Evaluation of Rigidity Center

Development of analytical seismic fragility functions for the common buildings in Iran

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