Article
Construction & Building Technology
Qiuhe Liang, Weili Luo, Yun Zhou, Xiaobo Ke, Junrui Li
Summary: This study proposes a novel three-dimensional isolation bearing composed of a horizontal laminated lead rubber bearing (LRB) and a vertical ring spring bearing (RSB) arranged vertically in series. The bearing achieves horizontal and vertical decoupling, and has promising isolation performance.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Geological
Panagiotis Martakis, Giulia Aguzzi, Vasilis K. Dertimanis, Eleni N. Chatzi, Andrea Colombi
Summary: This article presents a comprehensive numerical study on the performance of a novel nonlinear foundation design, which combines the load bearing capacity of commercial bearings with Bragg scattering in periodic structures to reduce structural demand under ground motion and maintain performance. By simulating the hysteresis behavior of bearings, it is demonstrated that the response of this foundation complies with current design standards, highlighting the limitations of linear analysis and showcasing the superior performance of the novel foundation in reducing base displacements.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Civil
Nagesh Ramaswamy, Bhagirath Joshi, Jiaji Wang, Xiaoliang Li, F. Y. Menq, Xiaonan Shan, Kalyana Babu Nakshatrala, K. H. Stokoe, Y. L. Mo
Summary: Seismic isolation systems aim to protect structures and uncouple their motion from incoming waves by reducing the kinetic energy transferred. This research focuses on a non-invasive vibration isolation system using periodic barriers and conducts field tests to evaluate their performance. The tests compare the effectiveness of different barrier lengths and the number of unit cells, and analyze the responses of soil to various excitation inputs.
ENGINEERING STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Gyeong-Hoi Koo, Jin-Young Jung, Jong-Keun Hwang, Tae-Myung Shin, Min-Seok Lee
Summary: This study developed a vertical seismic isolation device essential for the three-dimensional seismic isolation design of nuclear power plant equipment. Through actual tests, the performance of the vertical spring and seismic energy dissipation device was verified, and the optimal design vertical isolation frequencies were determined.
APPLIED SCIENCES-BASEL
(2022)
Article
Instruments & Instrumentation
Feifei Sun, Xiaoxin Dai, Yue Liu, Lei Xiao
Summary: The novel periodic foundation technology utilizes the filtering characteristics of periodic structures for seismic isolation, showing better attenuation effects. The IAPF-based periodic foundation has advantages in seismic mitigation performance, requiring less resonator mass for reducing structural response.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Acoustics
Rajan Prasad, Abhijit Sarkar
Summary: In this study, a periodic ladder frame structure with attenuation characteristics over the maximal range of frequencies for all wave propagation modes is synthesized. By developing a unit cell and eigenvalue map, optimal unit cells are synthesized and design guidelines for selection of parameters are presented. The approach shows significantly better isolation characteristics compared to homogeneous or arbitrarily chosen periodic structures.
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2021)
Article
Construction & Building Technology
A. H. M. Muntasir Billah, Asif Iqbal
Summary: This study investigates the impact of flood-induced scour on the seismic behavior of base-isolated bridges and evaluates the failure probability of isolated bridges under different combinations of seismic and flood hazards.
JOURNAL OF STRUCTURAL ENGINEERING
(2022)
Article
Engineering, Civil
Walaa Eltahawy, Keri L. Ryan, Sevki Cesmeci, Faramarz Gordaninejad
Summary: The study found that the acceptable range of 3D isolation periods for the vertical direction is 0.5-1.0 seconds, with the horizontal isolation period being around 3-4 times the vertical period, both directions having 20% damping.
JOURNAL OF EARTHQUAKE ENGINEERING
(2021)
Article
Nuclear Science & Technology
Xiuyun Zhu, Gao Lin, Rong Pan, Jianbo Li
Summary: This paper investigates the application of a 3D base-seismic isolation system in nuclear power plants. It presents the constitution and design theory of a 3D combined isolation bearing (3D-CIB) and validates its effectiveness through numerical analysis. The results show that the 3D-CIB can significantly reduce the horizontal acceleration response but may increase the displacement and rocking effect of the superstructure. The study highlights the importance of balancing isolation effectiveness and displacement control when designing the system.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Y. Huang, W. Li, C. Reichhardt, C. J. O. Reichhardt, Yan Feng
Summary: The phonon spectra of a 2D solid dusty plasma modulated by square and triangular periodic substrates show that wave propagation is suppressed due to confinement of particles. Different commensurability ratios lead to different vibrational characteristics, with a commensurability ratio of 1 resulting in particles oscillating at a specific frequency and a ratio of 2 allowing for more complex vibrational modes. The differences in spectra between square and triangular substrates are attributed to substrate anisotropy and alignment directions of the particles within potential wells.
Article
Green & Sustainable Science & Technology
Puyang Zhang, Jingyi Li, Conghuan Le, Hongyan Ding
Summary: This study conducted shaking table tests to investigate the behavior of bucket foundations for offshore wind turbines under seismic load. The results showed that the composite bucket foundation had a weaker seismic response and better anti-liquefaction performance.
Article
Chemistry, Multidisciplinary
Wanli Yang, Tiantian Huang, Junbo He, Shuaijun Zhang, Yan Yang, Weiming Liu, Xun Ge, Rui Zhang, Mengxia Qiu, Yuxiang Sang, Xingjun Wang, Xiaohao Zhou, Tianxin Li, Congfeng Liu, Ning Dai, Xin Chen, Zhiyong Fan, Guozhen Shen
Summary: This study demonstrates the formation of a lateral homosuperlattice (MLHS) with alternating 1T and 2H domains in a 2D WS2 monolayer plane. The 2H domains, laterally localized and isolated by potential wells, exhibit junction interfaces and irradiated photoluminescence (PL) with a lateral periodic distribution in the two-dimensional plane. The research on MLHSs provides insight into lateral homojunctions and homosuperlattices in a monolayer plane, offering an alternative approach to modulate optical and electronic behaviors in TMD monolayers.
Article
Physics, Fluids & Plasmas
Wenqi Zhu, C. Reichhardt, C. J. O. Reichhardt, Yan Feng
Summary: This study investigates the directional depinning dynamics of a two-dimensional dusty plasma solid modulated by a two-dimensional square periodic substrate. The results show the presence of prominent directional locking effects when the direction of the external driving force is close to the symmetry direction of the substrate. Different dynamical flow patterns and structures are observed during the locking steps. Additionally, moving ordered states are observed between adjacent locking steps.
Article
Green & Sustainable Science & Technology
Tianbo Peng, Jianyu Guan, Yicheng Wu
Summary: A Two-Stage seismic isolation method is proposed to enhance the post-earthquake resilience of bridge structures, which involves reducing the restoring force and horizontal stiffness in the first stage and increasing them in the second stage. A new type of seismic isolation device named Two-Stage Friction Pendulum Bearing (TSFPB) is developed based on the traditional friction pendulum bearing (FPB). The paper introduces the geometry configuration, sliding states, and hysteresis characteristics of the TSFPB theoretically, verifies its hysteresis curve experimentally, and proposes a simulation method in an FEM software. Numerical analysis shows that the Two-Stage seismic isolation method has better seismic performance and post-earthquake resilience compared to the conventional method, with adaptive restoring force, horizontal stiffness, and energy dissipation mechanism.
Article
Mechanics
Di Liu
Summary: In this study, the two-dimensional Navier-Stokes flows with time-periodic external forces are investigated. Invariant solutions are extracted using recurrent flow analysis, and the cost of searching for nearly-recurrent flows is reduced using low-dimensional projections based on the dynamic mode decomposition algorithm. The flows undergo a transition from a stable time-periodic state to oscillating and even turbulent flows as the period of forces increases. The existence of periodic orbits and their influence on the flow dynamics in different regimes are discussed.
Article
Mechanics
Zhibao Cheng, Min Li, Gaofeng Jia, Zhifei Shi
Summary: This paper proposes an adaptive Gaussian process (AGP) model to efficiently predict the complex dispersion relations for periodic structures. It first predicts the coefficients of the dispersion equation at selected frequencies, and then analytically solves the dispersion equation to establish the complex dispersion relation. PCA is used to reduce the dimension of these coefficients, and an adaptive procedure is integrated to improve the accuracy of the GP model.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Engineering, Mechanical
Zhibao Cheng, Qun Zhang, Zhifei Shi
Summary: This paper proposes an inerter enhanced dynamic vibration absorber (IDVA) to improve the low-frequency vibration mitigation performance of the floating slab track (FST). The analytical derivations and numerical simulations show that the IDVA is more effective in reducing vibrations and significantly decreasing the relative displacement response of the absorber compared to a regular dynamic vibration absorber.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Engineering, Civil
Haomin Ma, Zhibao Cheng, Gaofeng Jia, Zhifei Shi
Summary: The authors recently proposed an inerter-enhanced floating floor structure (In-FFS), and investigated its advantages compared to the traditional FFS through energy analysis. The In-FFS can suppress the input energy of the system and reduce the dynamic responses of the primary structure and floating floor slab.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2022)
Article
Materials Science, Multidisciplinary
Yiran Zhang, Hongjun Xiang, Housong Deng, Xuebin Zhang, Jiawang Zhan, Zhifei Shi
Summary: This work focuses on vibration-based piezoelectric energy harvesting and considers two typical types of vibration sources. A stable system-level modeling method is presented, allowing the harvester to be modeled using conventional finite element software and co-simulated with nonlinear circuits. The proposed method is validated and employed to investigate the performances of harvesters under typical real vibrations. Design suggestions for PEHs under different types of vibration sources are also provided.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2023)
Article
Construction & Building Technology
Zhibao Cheng, Haomin Ma, Zhifei Shi, Gaofeng Jia
Summary: This paper proposes an inerter enhanced floating floor structure (In-FFS) for seismic hazard mitigation. The In-FFS, equipped with a one-dimensional inerter-based composite system on traditional floating floor structure (FFS), can significantly improve seismic performance. Modal participation property analysis and time history analyses demonstrate that the In-FFS reduces relative displacement and decreases floor acceleration and inter-story drift of the primary structure.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Civil
Anchen Ni, Zhifei Shi
Summary: In this study, the concept of topological insulator is introduced into plates in civil engineering, and successfully obtains topologically protected interface states of flexural waves. Through topological wave transport between two domains with distinct topological phases, this novel topological metamaterial plate realizes wave guiding and wave attenuation simultaneously. The influence of geometric and material parameters on the interface states and band gap is discussed in detail. The dynamic characteristics of this novel type of plate are studied through full-field simulation in the frequency domain and experimentally validated. The study demonstrates high transmission efficiency and strong robustness against defects. The performance of the topological metamaterial plate in ambient vibration control is assessed based on measured acceleration records, facilitating the application of topological insulators in vibration mitigation, energy harvesting, and signal detection.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Zhifei Shi, Zhibao Cheng, Junjun Wu
Summary: This paper investigates the vibration mitigation of plane waves by periodic pile barriers in saturated soil. The dispersion curves and frequency responses are calculated to comprehensively investigate the impact of key factors on the attenuation zone, and the vibration reduction effectiveness is verified through the study of transient responses.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2022)
Article
Construction & Building Technology
Lingkai Meng, Zhifei Shi, Shengwang Hao, Zhibao Cheng
Summary: The filtering properties of a 2D periodic in-filled trench barrier system subjected to anti-plane and in-plane moving loads are investigated using the spatial Fourier transform and periodic structure theory. The dispersion equations for anti-plane and in-plane wave are obtained using the closed-form solution and the State-Space-Transfer-Matrix-Method (SSTMM), respectively. The vibration isolation regions of the barrier can be determined by comparing the attenuation zones (AZs) with the load-speed-line cluster.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Haomin Ma, Zhibao Cheng, Zhifei Shi, Alessandro Marzani
Summary: This paper proposes a novel passive vibration control system called the Inertial Amplification Mechanism-based Absorber (IAM-A) to mitigate undesired structural vibrations. The design parameters of the IAM-A are obtained using H2 and H & INFIN; optimization methods, and parametric studies and numerical simulations are conducted to evaluate its performance. Results confirm that the IAM-A outperforms the traditional Tuned Mass Damper (TMD) method in suppressing dynamic responses of the primary structure and reducing relative displacement response of the absorber.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Anchen Ni, Zhifei Shi, Qingjuan Meng, C. W. Lim
Summary: This study proposes a novel shallow buried periodic in-filled pipe barrier for mitigating surface waves. Through complex dispersion analysis, numerical simulations, and lab-scale experiments, the effectiveness and robustness of the barrier in attenuating surface waves are verified. The energy dissipation induced by material damping and local resonance of in-filled pipes contribute to wave attenuation. The feasibility of these novel wave barriers for mitigating train-induced vibrations is also preliminarily verified.
ENGINEERING STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Liangliang Wu, Zhifei Shi
Summary: This paper investigates the feasibility of using periodic pile barriers to mitigate vibrations in unsaturated soil. The study finds that periodic wave barriers in unsaturated soil can be designed to have a wide attenuation zone and effectively shield both P1 and S waves. This research removes obstacles for vibration mitigation in unsaturated soil by periodic pile barriers.
COMPUTERS AND GEOTECHNICS
(2023)
