Effects of central column aspect ratio on seismic performances of subway station structures

Chen, Zhiyi; Liu, Zhi‐Qian

doi:10.1177/1369433217706777

Cited by 14 publications

(11 citation statements)

References 16 publications

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“…To be specific, the cross-sectional dimension of the central column was 400 mm × 400 mm, whilst the cross-sectional dimension of the floor was 3500 mm × 850 mm. According to the conclusion in [6], the station floor could be considered as a rigid body on the condition that the linear stiffness ratio of the station floor to the central column was more than 10. Thus, it was a reasonable assumption that the column bottom could be regarded as a fixed end.…”

Section: Specimen Detailsmentioning

confidence: 99%

“…After the hybrid simulation process, a quasi-static test is conducted to illustrate the mechanical properties of the central column after the earthquake excitation. main way to study the seismic performance of subway stations, especially for failure progress [3][4][5][6][7]. Such investigations give clues to the design of typical underground structures.Yasuo et al [3] used the equivalent linearized constitutive model for soil modeling.…”

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confidence: 99%

“…Based on the proposed framework, the failure process of the Daikai station can be traced by the dynamic time-history analysis. In order to decrease the seismic responses of the Daikai station, Chen et al [6,7] proposed a self-centering energy dissipation column for the Daikai station. 3D time-history analysis results showed that the self-centering energy dissipation column would effectively decrease the internal forces of the central column and the peak and residual drift.…”

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Hybrid Simulation of Seismic Responses of a Typical Station with a Reinforced Concrete Column

2020

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During the 1995 Kobe earthquake, damages were observed in the Daikai subway station and adjacent tunnels. It was the first large-scale underground structure that failed under the earthquake excitation. Numerical and experimental analyses have been conducted to study the failure process of the Daikai station. However, the issue of the scale ratio still exists in the shaking table tests of underground structures. In order to tackle this issue, a hybrid simulation technique is developed here to study the seismic performance of a typical subway station. Based on the previous research, it is found that the central column is the critical component of the structure. Therefore, a reinforced concrete central column is physically tested in the hybrid simulation process. On the other hand, the remaining parts of the structure and soil domain are numerically modeled at the same time. Four hybrid simulation cases are conducted with peak ground accelerations of 0.01 g, 0.1 g, 0.22 g, and 0.58 g. The test results of displacement and shear force are compared with the analytical results. Moreover, the good agreement between the test results and numerical results validate the accuracy of the proposed hybrid test method. After the hybrid simulation process, a quasi-static test is conducted to illustrate the mechanical properties of the central column after the earthquake excitation. main way to study the seismic performance of subway stations, especially for failure progress [3][4][5][6][7]. Such investigations give clues to the design of typical underground structures.Yasuo et al. [3] used the equivalent linearized constitutive model for soil modeling. The viscous boundary was selected at the bottom of the finite element (FE) model. The transmission boundary was selected laterally. The rigid beam element and elastic beam element were selected for the structure modelling. The results showed that the shear force of the center column reached the bearing capacity during the earthquake and brittle failure happened. Due to the damage of the concrete, the vertical bearing capacity of the central column decreased, and the thrust exceeded the bearing capacity, which caused the center column to fail. The upper end of the side walls and the upper roof reached the ultimate bending capacity after the center column crushed. Huo et al. [4] applied an equivalent linearized constitutive material for soil modelling. The rigid boundary was applied on the bottom side, and the free boundary was selected on the lateral sides. The results showed that the soil-structure stiffness ratio was significant in the seismic analysis. The station with a lower stiffness ratio suffered more severe damage. As the Daikai station was designed subject to static loading only, the stirrup reinforcement ratio was relatively low, and brittle failure occurred due to the insufficient shear capacity. After the shear failure, the compressive bearing capacity of the central column decreased. In fact, the Daikai station had a large span. After the center column failed, the enti...

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Hybrid Simulation of Seismic Responses of a Typical Station with a Reinforced Concrete Column

2020

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“…However, the damage status of the structure in these two cases is completely different. The horizontal deformation capacity of the structure has been demonstrated to be related to the axial compression ratio, 37 Chen 37,38 indicated that the high axial compression ratio of the center column has a significant adverse impact on the seismic performance of the underground structure, which means that only using the IDR to define the seismic performance for an underground structure is not entirely correct. Du 39 proposed a method based on developing load‐carrying capacity envelops that account for both the axial compression ratio and the horizontal deformation, which was successfully applied to assess the damage mechanism of the Daikai subway station.…”

Section: Introductionmentioning

confidence: 99%

Interstory drift ratio associated with performance objectives for shallow‐buried multistory and span subway stations in inhomogeneous soil profiles

Jiang

Naggar

et al. 2020

Earthq Engng Struct Dyn

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The interstory drift ratios (IDRs) associated with the performance objectives for the underground structure are not well defined. In this paper, four levels of performance objectives are defined for shallow-buried subway station structure: operational, immediate occupancy, life safety, and collapse prevention. In order to develop IDRs corresponding to these performance objectives, 18 subway station structures were selected for this study. Pushover analyses were conducted using three-dimensional finite-element models considering two conditions of seismic loading: vertical and horizontal ground motions; and horizontal ground motion only. Shear-displacement capacity curves of the 18 subway station structures were obtained, and IDR limits were defined for each structure based on the relationship between the capacity curves and performance objective. Statistical analysis of the results demonstrated that the IDR limits considering the vertical ground motion (characterized by the same frequency with horizontal component) are smaller than that without consideration of the vertical ground motion. Based on these results, the IDR limit of 0.05%, 0.21%, 0.46%, and 0.72% is assigned for the four performance levels, respectively, for rectangular frame underground structures. The performance evaluation applied to Daikai station based on the proposed limits is found to be consistent with the actual postearthquake damage observations. The proposed limits of IDR could provide some guidance to the seismic design of underground structures, and could form the basis for developing appropriate performance limits for seismic provisions in design codes relevant to underground structures. K E Y W O R D S interstory drift ratio, performance objective, rectangular frame, underground structure, vertical ground motion 1 INTRODUCTION The performance-based seismic design (PBSD) approach intends to achieve defined performance objectives for the seismic design of the structure in a future earthquake. Federal Emergency Management Agency (FEMA) report FEMA-273, 1 FEMA-274 2 introduced the first PBSD procedure, which was aimed at seismic reinforcement of existing buildings, and

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“…Structural dynamic analysis is important to predict mechanical performance of structures in order to guarantee safety of the constructions when exposed to earthquakes (Chen and Liu, 2018; Chouw et al, 2006). To tackle the dynamic analysis, many implicit time integration methods were proposed and generally they show better accuracy and stability than some explicit algorithms.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamic analysis of the bridge bearing and genetic algorithm–based optimization for seismic mitigation

Liang

Cheng

Liu

et al. 2020

Advances in Structural Engineering

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Seismic mitigation for bridges by the specific bearing with highly elastoplastic dissipaters is very important to ensure safety of superstructures exposed to earthquakes. To study the lateral vibration of the bridge bearing, a nonlinear dynamic model is developed while thoroughly considering highly nonlinear mechanical properties of the bearing in this article. The generalized- α method is specifically adapted to solve the nonlinear equations. Moreover, nonlinear behavior of the bearing is fully incorporated through direct path-following of the practical experimental hysteresis curve. The proposed method is validated through careful comparison between the dynamic simulation and the quasi-static experimental results. Mechanical responses of the bridge-pier system under earthquake excitations can be calculated in a more reliable manner. On this basis, a parametric optimization model involving several key parameters of the bearing-pier system is developed. The optimization problem is solved by the genetic algorithm as the searching tool. Numerical examples show that mechanical responses of the bridge-pier system subjected to the earthquake excitations can be effectively mitigated after parametric optimization. The extensive applicability of the proposed method is validated through finding the optimized parameters for the bearing when multiple different earthquakes are considered. Moreover, the accumulative energy absorption of the bearing is also considered to enhance the seismic performance of the bearing. This work provides a reliable way of dynamic performance prediction and seismic mitigation study of nonlinear bridge bearing under earthquake excitations given any complex experimental hysteresis curve.

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Effects of central column aspect ratio on seismic performances of subway station structures

Cited by 14 publications

References 16 publications

Hybrid Simulation of Seismic Responses of a Typical Station with a Reinforced Concrete Column

Hybrid Simulation of Seismic Responses of a Typical Station with a Reinforced Concrete Column

Interstory drift ratio associated with performance objectives for shallow‐buried multistory and span subway stations in inhomogeneous soil profiles

Nonlinear dynamic analysis of the bridge bearing and genetic algorithm–based optimization for seismic mitigation

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