Nonlinear Static Seismic Analysis and Its Application to Shallow Founded Buildings with Soil-Structure Interaction

Brandis, Adriana; Kraus, Ivan; Petrovčič, Simon

doi:10.3390/buildings12112014

Cited by 4 publications

(4 citation statements)

References 61 publications

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“…Work [19] considers an integrated approach to seismic effects on steel moment frames, taking into account soil-structure interaction. It is emphasized that soil-base subsidence and structural failure are the most important factors in the analysis of dynamic effects on buildings and structures.…”

Section: Taking Account Of Soil-structure Interactionmentioning

confidence: 99%

Ensuring the Safety of Steel Moment Frames Subjected to Uncertain Impacts

Alekseytsev

2023

Buildings

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The article addresses the problem of safety evaluation of steel moment frames of civil buildings, e.g., warehouses, shops, garages, and multistory industrial buildings on deformable soil in the relevant case of an emergency impact. The case of accidental emergency impacts is considered when such parameters as the point, direction, and intensity of an impact cannot be predetermined. Such impacts are not expected to trigger the progressive collapse of currently implemented design solutions and the whole structure must maintain the property of survivability. To evaluate this property, several calculations are to be made in the quasi-static statement to identify the stress–strain state under the most dangerous accidental impacts. Further, final calculations are to be made in the dynamic statement. In this case, the problem of search is solved using the criterion of minimizing the integral safety margin of structural elements in a steel moment frame design. Calculations prevent the frame stability loss. The calculation is performed in the quasi-static statement using models made in compliance with the deformation theory of plasticity, while the calculation in the dynamic statement takes into account the associated plastic flow rule. The proposed procedures allow for designing steel moment frames that are resistant to accidental emergency impacts. Impact loading is analysed as pulse loading, which is statically equivalent to the dynamic effect of an inelastic impact of a stiff body on a structural system. The design and the efficiency evaluation of a steel moment frame of a two-story building are considered.

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Section: Taking Account Of Soil-structure Interactionmentioning

confidence: 99%

Ensuring the Safety of Steel Moment Frames Subjected to Uncertain Impacts

Alekseytsev

2023

Buildings

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“…In order to understand the seismic behavior of structures and thus prevent or at least mitigate fatal consequences, many studies and seismic analyses of the built environment have been carried out [1][2][3][4][5][6][7][8]. In recent decades, extensive research and significant advances have been made in modeling, analysis, design, and behavior assessment at the individual structure level as well as on the macro-urban [3,6,8], regional [5,9], and even world scales [2].…”

Section: Introductionmentioning

confidence: 99%

Framework for a City’s Performance Assessment in the Case of an Earthquake

Koren

Rus

2023

Buildings

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A comprehensive assessment of a city’s vulnerability and resilience is a prerequisite for an effective response to a natural disaster, such as an earthquake. However, an appropriate method for assessing the seismic performance of a complex urban system is still being researched. To address this gap, the purpose of this paper is to introduce a method for seismic performance assessment of a city as a socio-physical system. Therefore, various studies of individual urban components and their interactions were combined into a holistic framework and presented in a case study of a small mid-European town. The seismic vulnerability of the building inventory was assumed or assessed based on the fragility curves adopted from the literature on similar European building stock. Seismic scenarios of different earthquake intensity (PGA of 0.15 g and 0.30 g) combined with conservative and risky approaches were applied. Considering the human perspective, urban performance was evaluated on the basis of accessibility to urban services that satisfy basic human needs (for survival and protection) via graph theory measures of global efficiency and the shortest path. The temporal aspect (before the earthquake, immediately after it, after evacuation, and after recovery) was also included to obtain a comprehensive resilience assessment. It turned out that a stronger earthquake (PGA of 0.30 g) would have far-reaching consequences for the urban performance of the investigated town, and the old city center would be particularly affected. Following the event, the system’s performance is less than half as effective compared to the initial level, indicating a sharp deterioration in the quality of life as reflected in the possibility of meeting basic human needs.

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“…These methods allow for the incorporation of soil-structure interaction in the design, estimation of the inelastic response, and seismic performance assessment. Much of the current literature on soil-structure interaction pays particular attention to the effects of the soil-structure interaction when shallow foundations or piles are employed for the foundations [17] and its negative effect on the structural building response [18]. Other approaches have been focused on the soil, assessing the influence of the sandy soils in the soil-structure interaction [19] to explain that sandy soils amplify seismic waves on the soil-structure interface because of the soil-structure interaction effect.…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of RC Moment Frame Buildings Considering SSI Effects: A Case Study of the New Venezuelan Seismic Code

et al. 2023

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The Soil–Structure Interaction (SSI) effect has been widely evidenced during several earthquakes around the world. In the Venezuelan context, the seismic event in Caracas in 1967 showed the significant consequences of designing buildings without considering the SSI effect. Nevertheless, limited research on the seismic performance of concrete moment frames (commonly used as structural systems in office and residential buildings in Venezuela and Latin America) considering the SSI effects has been developed, although there have been continuous updates to the Venezuelan Seismic Code. In this research, the influence of the SSI on the seismic performance of RC moment frame buildings designed according to the New Venezuelan Seismic Code was studied. An extensive numerical study of 3D buildings using concrete moment frames supported by mat foundations on sandy and clayey soils was performed. The response spectrum method, non-linear static analysis, and non-linear dynamic analysis were used to assess the seismic response of the archetypes studied. The results show that SSI effects can have a significant impact on the seismic response of RC moment frame buildings, increasing the interstory drift ratio and decreasing the shear forces. As is shown in fragility curves, the probability of collapse increases for cases with flexible bases in comparison to the cases of models with fixed bases. Additionally, in the 24-story archetype, the fixed-base model reached a maximum probability of collapse. Finally, a new proposal for the reduction of the strength-reduction factor (R) must be incorporated into the Venezuelan Seismic Code to improve the safety of the structures. Limitations in the use of RC moment frames must be incorporated for high-rise buildings since, as the present work demonstrates, for high-period structures, the normative provisions are not reached.

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Nonlinear Static Seismic Analysis and Its Application to Shallow Founded Buildings with Soil-Structure Interaction

Cited by 4 publications

References 61 publications

Ensuring the Safety of Steel Moment Frames Subjected to Uncertain Impacts

Ensuring the Safety of Steel Moment Frames Subjected to Uncertain Impacts

Framework for a City’s Performance Assessment in the Case of an Earthquake

Seismic Performance of RC Moment Frame Buildings Considering SSI Effects: A Case Study of the New Venezuelan Seismic Code

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