Improved pushover method for seismic analysis of shallow buried underground rectangular frame structure

Jiang, Jiawei; Xu, Chengshun; Naggar, Hesham El; Du, Xiuli; Xu, Zigang; Assaf, Jamal

doi:10.1016/j.soildyn.2020.106363

Cited by 26 publications

(12 citation statements)

References 33 publications

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“…Since the joints undergo coordinated deformation, the internal force of the prefabricated component without joints is greater than or equal to that with joints, which is consistent with the conclusion obtained from the comparative analysis of the internal force of cast-in-place and fabricated station structures in relevant studies [31,49]. According to relevant literature, the change in seismic conditions [50][51][52] and peak acceleration [53][54][55] of a seismic wave will increase the seismic response of underground structures and, more importantly, will obviously change the seismic response characteristics. In order to further analyze the influence of the joint distribution on the seismic response of the fabricated station structure, the seismic conditions and peak acceleration were analyzed and the results are given in Sections 4.2 and 4.3 according to the research ideas of Section 4.1.…”

Section: Internal Forcesupporting

confidence: 87%

Effect Mechanism of Connection Joints in Fabricated Station Structures

He¹,

Li²

2021

Applied Sciences

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The seismic response of a fabricated subway station is a complex structural connection problem that depends on the mechanical properties of the joints. In order to obtain the optimal joint distribution of a fabricated station structure under earthquake action, three finite element models of a single ring structure of fabricated subway stations assembled with seven, five, and four prefabricated components were proposed. Seismic wave characteristics, peak acceleration, and coupled horizontal and vertical seismic components were considered to study the seismic response of the fabricated subway station structure with different forms of the joint distribution. The dynamic time history method was used to analyze the seismic response in three aspects: structure plastic strain, interlayer relative deformation, and internal force. The damage indexes and residual strength indexes of the joints were offered based on the concrete damage index to evaluate the joints’ damage degree. The results showed that the joints of the vault or bottom plate had little influence on the seismic response of the fabricated station structure. The sidewall joints had the obvious seismic response and the most severe damage under horizontal ground motion or coupled ground motion, which were the weak joints of the fabricated station structure. The existence of vertical ground motion aggravated the damage degree of sidewall joints, making the damage occurrence time of sidewall joints earlier and the damage end time extended. On the premise of meeting the mechanical load and site requirements, an assembly scheme with fewer prefabricated components can be selected.

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Section: Internal Forcesupporting

confidence: 87%

Effect Mechanism of Connection Joints in Fabricated Station Structures

He¹,

Li²

2021

Applied Sciences

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“…Jiang et al [84] proposed a similar conceptual approach to the one presented by He and Chen [82], for performing pushover analysis of underground structures to obtain the PSDM, accounting for both horizontal and vertical earthquake excitation effects. The researchers analyzed the seismic vulnerability of various types of subway stations (i.e., two-story, two span and two-story, three span, subway stations; Daikai subway station, in Kobe Japan, which collapsed during the 1996 Great Hanshin earthquake).…”

Section: Mountain Tunnels and Tunnels In Rockmentioning

confidence: 99%

“…Some studies used 2D numerical models of the examined ground structure configurations to perform pushover analyses, to estimate the structural capacity of, and set the thresholds for, the damage states to develop fragility functions. In most cases the general-purposed FE code ABAQUS was employed to perform the analyses (i.e., more than half of the studies) [56,[63][64][65][66]82,84,85,[89][90][91][92][93][94]. Other FE codes, such as PLAXIS 2D [61], MIDAS [51,60], and SAP2000 [79,80] were also used.…”

Section: Numerical Codes and Constitutive Models Used In Analytical S...mentioning

confidence: 99%

“…Several studies proposed the use of maximum drift ratio θ (i.e., maximum relative interstory displacement over the height of structure, θ = max(δ(t)/h)) as an adequate EDP for the assessment of rectangular tunnels and subway stations [76,78,82,[84][85][86]89,93,94]. This displacement-based EDP, as well as the one proposed by Andreotti and Lai [44], are more compatible with the physics of the problem in hand.…”

Section: Edps and Damage State Definitions For Vulnerability Assessme...mentioning

confidence: 99%

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Developments in Seismic Vulnerability Assessment of Tunnels and Underground Structures

et al. 2022

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Underground structures are being constructed at an increasing rate in seismic prone areas, to facilitate the expanding needs of societies. Considering the vital role of this infrastructure in densely populated urban areas and interurban transportation networks, as well as the significant losses associated with potential seismically induced damage, its assessment against seismic hazard is of great importance for stakeholders, operators, and governmental bodies. This paper presents a state-of-the-art review of current developments in the assessment of seismic vulnerability of tunnels and underground structures. Methods for the development of fragility functions for the assessment of bored tunnels in rock or alluvial, and cut and cover tunnels and subways in alluvial, against ground seismic shaking and earthquake-induced ground failures are presented. Emphasis is placed on the estimation of the capacity of the examined structures, the selection of appropriate intensity measures to express seismic intensity, the development of rational probabilistic seismic demand models and the estimation of epistemic and aleatoric uncertainties, related to the seismic fragility of underground structures. Through the discussion, acknowledged gaps in the relevant literature are highlighted.

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“…Zou et al [6] proposed an improved finite element method, NewPSA, to predict the nonlinear behavior of underground frame structures under horizontal seismic action and a new one-dimensional seismic analysis method to calculate the distribution of displacement and shear stress along the depth in the free field with the increase of the movement of bedrock. Jiang et al [7] proposed an improved pushover analysis method (I-PAM) and proved that I-PAM could accurately predict the maximum axial force, bending moment, and displacement of the structure. Shi et al [8] and Yu and Yuan [9], respectively, adopted the response displacement method to discuss the applicability of the seismic analysis of underground integrated pipe corridor and complex underground large space structure, as well as the selection of foundation spring stiffness and the simulation method.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the Influence of Increasing Seismic Fortification Intensity on Seismic Performance of Underground Station

Zeng

Shuanhai

Yin

2021

Advances in Civil Engineering

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China Earthquake Parameter Zoning (2016) has increased the seismic fortification intensity in Chengdu from VII to VIII. It is necessary to conduct in-depth discussion on the impact of the seismic performance of the built underground station structure. In this paper, a stratum-structure finite element model is established with a Chengdu subway station as an example. The model boundary adopts viscoelastic boundary, and the ground motion is input in the form of equivalent nodal force. The equivalent linearization method is used to consider the nonlinearity of soil materials. The time-history analysis of seismic fortification intensity of VII and VIII degrees is carried out, respectively. By comparing the calculation results of the two seismic fortification intensity ground motion conditions, it is concluded that the connection between the side wall and the floor is the weakest position of the station structure under the action of the earthquake; the seismic fortification intensity is increased from VII to VIII to the internal force of the structure. It has a relatively large impact, especially the most obvious impact on the bending moment. The results of the verification of the seismic time-history analysis show that the increase of fortification intensity will have a more obvious impact on the structural deformation, and the structural design of the station can meet the safety performance requirements of VII and VIII degrees of seismic fortification. The research has certain reference significance for the seismic safety evaluation of the built underground station structure in Chengdu area.

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Improved pushover method for seismic analysis of shallow buried underground rectangular frame structure

Cited by 26 publications

References 33 publications

Effect Mechanism of Connection Joints in Fabricated Station Structures

Effect Mechanism of Connection Joints in Fabricated Station Structures

Developments in Seismic Vulnerability Assessment of Tunnels and Underground Structures

Analysis on the Influence of Increasing Seismic Fortification Intensity on Seismic Performance of Underground Station

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