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学者姓名：赵密
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摘要 ：
The precast composite reinforced concrete wall with the advantages of fewer joints, superior impermeability and rapid construction provides an efficient and environmental friendly alternative in the construction of underground utility tunnels in the last few years. To investigate the seismic performance of precast concrete composite walls of utility tunnels with grouting-sleeve connection under out-ofplane loads, a series of quasi-static cyclic tests were performed on the full-scale sidewall specimens with different axial compression ratios in this study. The experimental results including the failure modes, crack distributions, and the influence of different connections on the out-of-plane seismic performance of precast concrete composite wall were carefully examined and compared with those from the cyclic tests of the cast-in-place sidewalls of the utility tunnel. The test results show that the seismic performance of the precast concrete composite sidewall specimen, such as the hysteresis curves, the ultimate bearing capacity, stiffness degradation pattern and the ductility ratio, is basically the same as that of the cast-in-place specimen, indicating that the seismic performance of the prefabricated structure is equivalent to that of the cast-in-place structure. Moreover, the grouting-sleeves of the joints can effectively transfer the reinforcement stress until the failure of the precast concrete composite sidewall specimens, which exhibits excellent out-of-plane ductility and serviceability.
关键词 ：
Seismic performance Seismic performance Precast concrete composite walls Precast concrete composite walls Grouting sleeve Grouting sleeve Cyclic response Cyclic response Failure mechanism Failure mechanism
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| GB/T 7714 | Zhong, Zilan , Li, Guangfan , Li, Jinqiang et al. Experimental study on out-of-plane seismic performance of precast composite sidewalls of utility tunnel with grouting-sleeve joints [J]. | UNDERGROUND SPACE , 2024 , 16 : 1-17 . |
| MLA | Zhong, Zilan et al. "Experimental study on out-of-plane seismic performance of precast composite sidewalls of utility tunnel with grouting-sleeve joints" . | UNDERGROUND SPACE 16 (2024) : 1-17 . |
| APA | Zhong, Zilan , Li, Guangfan , Li, Jinqiang , Shen, Jiaxu , Zhao, Mi , Du, Xiuli . Experimental study on out-of-plane seismic performance of precast composite sidewalls of utility tunnel with grouting-sleeve joints . | UNDERGROUND SPACE , 2024 , 16 , 1-17 . |
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摘要 ：
Wind-wave-current interaction is a phenomenon which is present in many practical engineering situations and vertical earthquakes may have significant influence on the hydrodynamic pressure of seawater in regions of active seismicity. This study is devoted to probe the wave height and hydrodynamic pressure of seawater caused by the joint wind, wave, current and earthquake action based on computational fluid dynamics (CFD) method, where a homogeneous multiphase model based on the noncompressible Reynolds Averaged Navier-Stokes (RANS) equation and the k-epsilon turbulence model implemented in ANSYS-Fluent code was used. First, a two-dimensional (2D) numerical flume excited by wind, wave, current and earthquake loadings was established through the secondary development of a user-defined function (UDF). Subsequent, effects of wind-wave interaction and wind-wave-current interaction on the wave height and hydrodynamic pressure of seawater were investigated. Finally, effects of wave-earthquake interaction and wave-current-earthquake interaction on the wave height and hydrodynamic pressure of seawater were investigated. The nonlinearity of seawater under joint wind, wave, current and earthquake action was also studied.
关键词 ：
Hydrodynamic pressure Hydrodynamic pressure Wind-wave-current-earthquake interaction Wind-wave-current-earthquake interaction K -epsilon turbulence model K -epsilon turbulence model CFD CFD RANS equation RANS equation
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| GB/T 7714 | Wang, Piguang , Yu, Wanli , Zhao, Mi et al. Effects of wind-wave-current-earthquake interaction on the wave height and hydrodynamic pressure based on CFD method [J]. | OCEAN ENGINEERING , 2024 , 305 . |
| MLA | Wang, Piguang et al. "Effects of wind-wave-current-earthquake interaction on the wave height and hydrodynamic pressure based on CFD method" . | OCEAN ENGINEERING 305 (2024) . |
| APA | Wang, Piguang , Yu, Wanli , Zhao, Mi , Du, Xiuli . Effects of wind-wave-current-earthquake interaction on the wave height and hydrodynamic pressure based on CFD method . | OCEAN ENGINEERING , 2024 , 305 . |
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摘要 ：
In this paper, a seismic and vibration reduction measure of subway station is developed by setting a segmented isolation layer between the sidewall of structure and the diaphragm wall. The segmented isolation layer consists of a rigid layer and a flexible layer. The rigid layer is installed at the joint section between the structural sidewall and slab, and the flexible layer is installed at the remaining sections. A diaphragm wall-segmented isolation layer-subway station structure system is constructed. Seismic and vibration control performance of the diaphragm wall-segmented isolation layer-subway station structure system is evaluated by the detailed numerical analysis. Firstly, a three-dimensional nonlinear time-history analysis is carried out to study the seismic response of the station structure by considering the effect of different earthquake motions and stiffness of segmented isolation layer. Subsequently, the vibration response of site under training loading is also studied by considering the influence of different train velocities and stiffness of the segmented isolation layer. Numerical results demonstrate that the diaphragm wall-segmented isolation layer-subway station structure system can not only effectively reduce the lateral deformation of station structure, but also reduce the tensile damage of the roof slab. On the other hand, the developed reduction measure can also significantly reduce the vertical peak displacements of site under training loading.
关键词 ：
Subway station Subway station Diaphragm wall Diaphragm wall Segmented isolation layer Segmented isolation layer Seismic response Seismic response Train vibration Train vibration
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| GB/T 7714 | Gao, Zhidong , Li, Mingbo , Zhao, Mi et al. Seismic and vibration control of segmented isolation layer in underground structure-diaphragm wall system [J]. | UNDERGROUND SPACE , 2024 , 19 : 72-86 . |
| MLA | Gao, Zhidong et al. "Seismic and vibration control of segmented isolation layer in underground structure-diaphragm wall system" . | UNDERGROUND SPACE 19 (2024) : 72-86 . |
| APA | Gao, Zhidong , Li, Mingbo , Zhao, Mi , Du, Xiuli . Seismic and vibration control of segmented isolation layer in underground structure-diaphragm wall system . | UNDERGROUND SPACE , 2024 , 19 , 72-86 . |
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摘要 ：
The seismic performance of underground structures is strongly influenced by the characteristics of both the surrounding soil and the earthquake. In contrast to traditional deterministic analysis methods, this study uses a stochastic analysis approach to investigate the effect of uncertainties in nonlinear soil characteristics, shear wave velocity, density, and earthquake randomness on the response of underground stations. The equivalent linearization method is employed to approximate the nonlinear behavior of the soil. The soil was modeled using a linear elastic constitutive model combined with Rayleigh damping in the finite element model. Inter-story displacements are used to determine structural damage. Probabilistic analysis methods are used to obtain their statistical characteristics, and the probability of failure is calculated. The results show that, according to single parameter analysis, random ground motion results in the greatest probability of exceeding the threshold (PET), while ground shear wave velocity significantly affects the coefficient of variation (COV), and the effect of density is the smallest. The study also found that when soil nonlinearity, shear wave velocity, and random ground motion are considered simultaneously, the range, mean, standard deviation, and COV of interstory displacement all increase significantly, but the PET slightly decreases. In summary, the analysis results indicate that random ground motion has the greatest impact on interstory displacement, followed by shear wave velocity, with nonlinear soil characteristics having a smaller effect, and density the least. Therefore, the impact of various uncertainties should be fully considered in the analysis of underground structures, especially random ground motion and shear wave velocity.
关键词 ：
Probabilistic analysis Probabilistic analysis Random ground motion Random ground motion Shear wave velocity Shear wave velocity Nonlinear soil characteristics Nonlinear soil characteristics Underground structures Underground structures Density Density
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| GB/T 7714 | Zhang, Wenhao , Sun, Rui , Ni, Pinghe et al. Quantitative analysis of subway station seismic deformation under random earthquakes and uncertain soil properties using the equivalent linearization method [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 188 . |
| MLA | Zhang, Wenhao et al. "Quantitative analysis of subway station seismic deformation under random earthquakes and uncertain soil properties using the equivalent linearization method" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 188 (2024) . |
| APA | Zhang, Wenhao , Sun, Rui , Ni, Pinghe , Zhao, Mi , Naggar, M. Hesham El , Du, Xiuli . Quantitative analysis of subway station seismic deformation under random earthquakes and uncertain soil properties using the equivalent linearization method . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 188 . |
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摘要 ：
In this paper, an enhanced prismatic -element scaled boundary perfectly matched layer (SBPML) is developed, which is a novel time -domain artificial boundary method for 3D infinite wave problems. The SBPML permits the utilization of an artificial boundary with general geometry and can consider planar physical surfaces and interfaces extending to infinity. Moreover, this enhancement enables the seamless integration with surface meshes of arbitrary polygonal faces (such as triangles, quadrangles, pentagons, heptagons, octagons, etc.) at the truncation boundaries. The interior domain can be modelled by polyhedrons formulated by the scaled boundary finite element method (SBFEM). The geometric shape of the SBPML elements in the proposed method, within the local coordinate system, takes the form of a regular prism with regular polygonal top and bottom faces. Consequently, it is referred to as the Prismatic -element SBPML. Local scaled boundary coordinates based on the polygonal shape function are firstly introduced into the truncated infinite domain to describe its general geometry properties and provide the coupled capabilities with arbitrary polygonal face meshes at the truncation boundaries of numerical models. Then, a complex stretching function from PML is applied to radial direction of the local scaled boundary coordinates to map the physical space onto the complex space, resulting in a SBPML domain. Upon spatial discretization, the proposed method is formulated using a 2nd -order mixed displacement -stress unsplit-field formulation, allowing seamless coupling with FEM and SBFEM originally designed for the interior computational domain. Finally, three benchmark examples of wave propagation problems in unbounded domains and two soil -structure interaction problems of engineering problems are presented to demonstrate the accuracy and robustness of the Prismatic -element SBPML.
关键词 ：
Artificial boundary method Artificial boundary method Scaled boundary perfectly matched layer Scaled boundary perfectly matched layer Dynamic soil-structure interaction Dynamic soil-structure interaction Unbounded domain Unbounded domain Transient wave propagation Transient wave propagation Polygonal shape function Polygonal shape function
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| GB/T 7714 | Zhang, Guoliang , Zhao, Mi , Zhang, Junqi et al. Prismatic-element SBPML coupled with SBFEM for 3D infinite transient wave problems [J]. | COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING , 2024 , 427 . |
| MLA | Zhang, Guoliang et al. "Prismatic-element SBPML coupled with SBFEM for 3D infinite transient wave problems" . | COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 427 (2024) . |
| APA | Zhang, Guoliang , Zhao, Mi , Zhang, Junqi , Du, Xiuli . Prismatic-element SBPML coupled with SBFEM for 3D infinite transient wave problems . | COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING , 2024 , 427 . |
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摘要 ：
本发明公开了一种宽流速多流向双向涡激振动俘能装置和方法，其中装置包括，竖直定轴、可绕定轴旋转的水平的悬臂和竖直俘能柱体。悬臂和定轴之间通过扭转弹簧连接。悬臂沿长度方向设有导轨滑块组件，上面垂直于悬臂悬挂俘能柱体，俘能柱体可以沿悬臂长度方向振动。整个装置包含悬臂绕定轴的转动自由度和俘能柱体沿悬臂长度方向的平移自由度。定轴底部装有驱动电机可以带动定轴旋转改变悬臂方向。此方案可以激发横流和顺流双向涡激振动，其俘能效率更高。同时，流速和流向发生变化时，该方案可以通过旋转定轴调整悬臂和来流之间的夹角，调整俘能柱体在横流方向上的自振频率使其和涡泄频率保持一致，从而有更宽的流速流向俘能范围。
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| GB/T 7714 | 曲杨 , 王丕光 , 徐浩然 et al. 一种宽流速多流向双向涡激振动俘能装置和方法 : CN202310600286.6[P]. | 2023-05-25 . |
| MLA | 曲杨 et al. "一种宽流速多流向双向涡激振动俘能装置和方法" : CN202310600286.6. | 2023-05-25 . |
| APA | 曲杨 , 王丕光 , 徐浩然 , 赵密 . 一种宽流速多流向双向涡激振动俘能装置和方法 : CN202310600286.6. | 2023-05-25 . |
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摘要 ：
When the numerical analysis of a long lined tunnel is carried out, the calculation amount of the finite element model becomes restricted large-scale parameter analysis. In this paper, an efficient and high-precision 2.5-dimensional (2.5D) frequency-domain finite element method is used to simulate the three-dimensional response of tunnels under the action of oblique incident plane seismic waves. This method can save calculations and avoid the boundary effect caused by the longitudinal truncation of the tunnel. The 2.5D zigzag-paraxial boundary is developed. The artificial boundary is attached to the structure's surface. The substructure method for oblique plane seismic waves is established. Comparing the substructure method with the analytical solution, the correctness of the site response is verified first. The accuracy of the 2.5D finite element substructure method is further verified. The parameter analysis of different incident angles and conversion angles shows that the underground tunnel does not reach the maximum of structural seismic response when the seismic wave is vertically incident. The location of the soil-rock interface on the tunnel is further discussed. The results show that when the underground tunnel crosses the location of the soil-rock interface, the seismic response of the tunnel will be amplified.
关键词 ：
5D finite element 5D finite element soil-structure interaction soil-structure interaction seismic response seismic response 2 2 substructure method substructure method long lined tunnel long lined tunnel
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| GB/T 7714 | Zhang, Qi , Zhao, Mi , Huang, Jingqi et al. Parameter Analysis on Seismic Response of Long Lined Tunnel by 2.5D Substructure Method [J]. | APPLIED SCIENCES-BASEL , 2023 , 13 (7) . |
| MLA | Zhang, Qi et al. "Parameter Analysis on Seismic Response of Long Lined Tunnel by 2.5D Substructure Method" . | APPLIED SCIENCES-BASEL 13 . 7 (2023) . |
| APA | Zhang, Qi , Zhao, Mi , Huang, Jingqi , Du, Xiuli . Parameter Analysis on Seismic Response of Long Lined Tunnel by 2.5D Substructure Method . | APPLIED SCIENCES-BASEL , 2023 , 13 (7) . |
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摘要 ：
In recent years, the surrogate modeling technique has been increasingly employed for the failure probability estimation of civil structures. The surrogate modeling technique acts as a black box that predicts the performance of expensive-to-evaluate problems. However, the uncertainty of failure probability estimation due to the discrepancy between the surrogate model and physical model has not been well studied. This study introduces a new surrogate modeling technique for failure probability estimation of civil structures that utilizes a Bayesian neural network. Specifically, a fully connected neural network is constructed to approximate the limit state function. The hyperparameters in the neural network are obtained within the Bayesian paradigm, and the probability distributions are estimated through Laplace approximation. When the Bayesian neural network method is used for reliability analysis, the failure curve and the corresponding uncertainty can be estimated. Numerical studies on 2d truss, a simple support beam under moving load, and dynamic analysis of subway station considering the soil-structure interaction are conducted to validate the efficiency of the approach. Results with Monte Carlo simulation and subset simulation are also presented. The results demonstrate the proposed method's potential for improving prediction accuracy by factoring in the uncertainty embedded in the surrogate model. Additionally, it exhibits higher levels of efficiency than traditional methods.
关键词 ：
Structural reliability analysis Structural reliability analysis Bayesian neural network Bayesian neural network Surrogate modeling technique Surrogate modeling technique Machine learning Machine learning
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| GB/T 7714 | Zhang, Wenhao , Zhao, Mi , Du, Xiuli et al. Probabilistic machine learning approach for structural reliability analysis [J]. | PROBABILISTIC ENGINEERING MECHANICS , 2023 , 74 . |
| MLA | Zhang, Wenhao et al. "Probabilistic machine learning approach for structural reliability analysis" . | PROBABILISTIC ENGINEERING MECHANICS 74 (2023) . |
| APA | Zhang, Wenhao , Zhao, Mi , Du, Xiuli , Gao, Zhidong , Ni, Pinghe . Probabilistic machine learning approach for structural reliability analysis . | PROBABILISTIC ENGINEERING MECHANICS , 2023 , 74 . |
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摘要 ：
This research aims to explore the influence of near-fault velocity pulse on the seismic response of subway station under the condition of acceleration response spectra being consistent. Two suites of seismic motions are utilized, one suite is twelve as-recorded seismic motions with velocity pulses, and the other one suite is the corresponding artificial seismic motions synthesized with the response spectra of seismic motions in the first suite as target spectra. For each seismic motion with velocity pulse, the corresponding synthetic seismic motion without velocity pulse is generated by using the method of superimposing narrow-band time histories. Numerical model of soil-subway station interaction is developed by using the commercial software ABAQUS with a practical 3-span, 3-story subway station as the prototype. Numerical results indicate that with the engineering sites change from hard to soft and the burial depths change from shallow to deep, the adverse effect of velocity pulse is more significant, and the maximum inter-story drift ratio of subway station with a burial depth of 20 m embedded in site classes I, II and III has increased by 16.5%, 20.1% and 21.7%, respectively. However, the influence of velocity pulse on the concrete compression damage of subway station is not obvious.
关键词 ：
Synthetic seismic motion Synthetic seismic motion Soil -structure interaction Soil -structure interaction Subway station structure Subway station structure Near -fault velocity pulse Near -fault velocity pulse Response spectrum Response spectrum
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| GB/T 7714 | Zhang, Chengming , Lv, Hui , Li, Shenruoran et al. Influence of near-fault velocity pulse on the seismic response of subway station structure [J]. | STRUCTURES , 2023 , 58 . |
| MLA | Zhang, Chengming et al. "Influence of near-fault velocity pulse on the seismic response of subway station structure" . | STRUCTURES 58 (2023) . |
| APA | Zhang, Chengming , Lv, Hui , Li, Shenruoran , Zhao, Mi , Gao, Zhidong , Wan, Ling . Influence of near-fault velocity pulse on the seismic response of subway station structure . | STRUCTURES , 2023 , 58 . |
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摘要 ：
Tuned mass damper (TMD) is a practical tool for reducing structural vibration. The current TMD design often use the dynamic characteristics of structures with fixed base. However, in terms of resisting earthquakes especially when the soil-structure interaction (SSI) effect is prominent, the TMD designed for the fixed base situation behaves unfavorably and even amplifies the structural response. In this paper, a parameter design and performance evaluation of TMD for seismic control of structure considering SSI is studied. The contents include the SSI modeling, structural dynamic characteristic identification, and TMD parameter designing. A seismic SSI model that the soil is simulated by an accurate lumped parameter models (LPMs) is built firstly. A simple and practical method is then used to identify the structural dynamic characteristic of SSI model. The identified structural frequency is used to compute the parameters of TMD. Finally, two types of structures, three kinds of soils, and 100 ground motions are applied to comprehensively evaluate the TMD performance through the comparison with the fixed-ground-based design and optimization-algorithm-based design. The research shows the TMD designed by the proposed method can show a good performance and robustness.
关键词 ：
TMD design TMD design Dynamic characteristics Dynamic characteristics Soil-structure interaction Soil-structure interaction Accurate lumped parameter models Accurate lumped parameter models Performance evaluation Performance evaluation
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| GB/T 7714 | Gao, Zhidong , Zhao, Mi , Wu, Yangzhou et al. Parameter design and performance evaluation of tuned mass damper (TMD) for seismic control of structure considering soil-structure interaction (SSI) [J]. | STRUCTURES , 2023 , 52 : 1116-1129 . |
| MLA | Gao, Zhidong et al. "Parameter design and performance evaluation of tuned mass damper (TMD) for seismic control of structure considering soil-structure interaction (SSI)" . | STRUCTURES 52 (2023) : 1116-1129 . |
| APA | Gao, Zhidong , Zhao, Mi , Wu, Yangzhou , Wang, Meng , Du, Xiuli . Parameter design and performance evaluation of tuned mass damper (TMD) for seismic control of structure considering soil-structure interaction (SSI) . | STRUCTURES , 2023 , 52 , 1116-1129 . |
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