Mass eccentricity effects on the torsional response of inelastic buildings

Georgoussis, George K.; Mamou, Anna

doi:10.21595/vp.2019.20553

Cited by 4 publications

(4 citation statements)

References 20 publications

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“…There are many variables to be taken into account, and all of them have some degree of uncertainty. The irregularities in the spatial distribution of mass, stiffness, and lateral resistance of buildings lead to torsional effects, even in symmetric buildings, and thus make them more susceptible and vulnerable to damage in severe earthquakes [1][2][3]. Design standards recognize the importance of torsional contributions to the horizontal displacement response and simplified procedures have been proposed to estimate these contributions [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Determination of Mass Properties in Floor Slabs from the Dynamic Response Using Artificial Neural Networks

González-Pérez

De-la-Colina²

2022

Civ Eng J

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Most of the research on accidental eccentricity is directed at both the evaluation of accidental eccentricity design code recommendations and the study of building torsional response. In contrast, this paper addresses how the mass properties of each of the levels of a building could be determined from the dynamic response of a building. Using the dynamic response of buildings, this paper presents the application of multilayer feed forward artificial neural networks (ANNs) to determine the magnitude, the radial distance, and the polar moment of inertia of the mass for each level of reinforced concrete (RC) buildings. Analytical models were developed for three regular buildings. Live-load magnitude and mass position are considered as random variables. Seven load cases were generated for the 1, 2 and 4-story models using two excitations. As for the input parameters of the ANNs, three different choices of input data to the network were used. The developed ANN models are able to predict with adequate accuracy the radial position, magnitude, and polar moment of inertia of masses of each level. The implementation of this method based on ANNs would allow the monitoring, either permanently or temporarily, of changes in mass properties at each building floor slab. Doi: 10.28991/CEJ-2022-08-08-01 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Determination of Mass Properties in Floor Slabs from the Dynamic Response Using Artificial Neural Networks

González-Pérez

De-la-Colina²

2022

Civ Eng J

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“…Georgoussis and Mamou (2018), presented a design procedure for asymmetric buildings with mass eccentricity which minimizes the torsional response of an asymmetric building. They studied multistory asymmetric buildings in those which the center of mass was on the same side of the plan and showed that their proposed design procedure can minimize the torsional response of a structure “Georgoussis and Mamou (2018).”…”

Section: Introductionmentioning

confidence: 99%

“…They studied multistory asymmetric buildings in those which the center of mass was on the same side of the plan and showed that their proposed design procedure can minimize the torsional response of a structure " Georgoussis and Mamou (2018)." Georgoussis and Mamou (2019), investigated the influence of mass eccentricity on nonlinear torsional response of an asymmetric building subjected to one-directional earthquake. They showed that the impact of accidental eccentricity on nonlinear torsional response is not notable if, firstly, configuration of the structure is designed in accordance with elastic displacement response and, secondly the strength assigned to each lateral load resisting element has been derived from a planar static analysis under a lateral loading simulating a translational mode of vibration " Georgoussis and Mamou (2019).…”

Section: Introductionmentioning

confidence: 99%

Improving the torsional response of asymmetric buildings with self-centering controlled rocking steel braced frame system

Hafezi

Aziminejad

Mansoori

et al. 2022

Advances in Structural Engineering

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Self-centering controlled rocking steel braced-frame (SC-CR-SBF) is proposed as an earthquake-resistant system with low damage. Pre-stressed vertical strands provide a self-centering mechanism in the system and energy absorbing fuses restrict maximum displacement. Presence of asymmetry in structures can highlight the advantages of employing this structural system. Moreover, these days designing and constructing asymmetric and irregular structures is inevitable and as a result of architectural attractiveness and requirements of different functions of buildings, they are of great importance. Consequently, in these types of structures in order to minimize seismic responses, particular measures should be taken into consideration. Proper distribution of strength and stiffness throughout the plan of structures with self-centering systems can play a considerable role in resolving problems associated with asymmetry in these structures. In this study, the asymmetric buildings with 10% and 20% mass eccentricities and having different arrangements of centers were simulated. The models were analyzed under a set of 22 bidirectional far-field ground-motion records and corresponding responses of maximum roof drift, acceleration and rotation of the roof diaphragms of the structures with different arrangements of the center of mass, stiffness and strength were computed and studied. Results show that proper distribution of stiffness and strength throughout the plan of the structures with SC-CR-SBF system reduces the maximum roof drift as well as the rotation of the roof diaphragm. With appropriate arrangement of the centers, maximum drift response of the asymmetric structure decreases as much as roughly 20% and the ratio of the maximum drift response of the asymmetric structure to the response of the similar symmetric structure with the same overall stiffness and strength was 1.1. In other words, maximum drift response of the asymmetric structure with SC-CR-SBF system is acceptably close to the one for the symmetric building.

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“…Such mass eccentricity may occur due to the non‐uniform distribution of mass (e.g., irregular distribution of masonry infills) over the floor slab or may be due to the overhanging slab such as a balcony, as mentioned in some of the previous literature. [ 26–28 ] Mass eccentricity may be very high if furniture or other heavy‐weight appliances are placed at one side of the plan area. In addition to this, sometimes water tank placed at one side of the roof may give rise to such mass eccentricity, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Inelastic seismic behavior of asymmetric structures with mass and stiffness eccentricity under bidirectional ground motions

Hussain

Dutta

2022

Structural Design Tall Build

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Structures with an asymmetric plan have proved to be severely vulnerable during the past earthquakes. The vulnerability may arise due to the uneven distribution of stiffness or mass. Most of the research focused on studying the eccentricity arising due to the irregular stiffness distribution. On the other hand, the systems with mass eccentricity arising due to the uneven distribution of mass at floor level are given relatively little attention. Hence, the present paper comprehensively studied the stiffness and mass eccentric systems together. In each case, the structure is subjected to bidirectional components of ground motion, which reflects the real situation more closely. So, for the lateral load-resisting elements (columns), effect of biaxial interaction due to simultaneous bidirectional movement is included in the hysteresis behavior as explained in the paper to make a reasonably accurate prediction. Primarily idealized single-story systems were used to study how asymmetric structures are vulnerable if they have stiffness or mass eccentricity. Further, the three-story asymmetric systems were also included in the scope of the study to observe the effect of higher modes. To simulate a more practical situation, the present paper considers higher eccentricity in the first story of the three-story system due to functional reasons, while the upper stories have lesser eccentricities compared to the first story.The present study shows that mass eccentric systems are equally vulnerable to earthquakes as stiffness eccentric systems. Further, three-story systems show a manifold increase in response compared to its single-story counterparts. Such a study may help to develop more insight into the generic behavior of plan asymmetric systems, leading to the improvement of design guidelines.

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Mass eccentricity effects on the torsional response of inelastic buildings

Cited by 4 publications

References 20 publications

Determination of Mass Properties in Floor Slabs from the Dynamic Response Using Artificial Neural Networks

Determination of Mass Properties in Floor Slabs from the Dynamic Response Using Artificial Neural Networks

Improving the torsional response of asymmetric buildings with self-centering controlled rocking steel braced frame system

Inelastic seismic behavior of asymmetric structures with mass and stiffness eccentricity under bidirectional ground motions

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