Article
Mechanics
Yingli Li, Gengwang Yan
Summary: An innovative two-dimensional hybrid auxetic elastic metamaterial was proposed for vibration attenuation, with multiple bandgaps at ultra-low frequency. The bandgap and longitudinal elastic wave attenuation were characterized using theoretical and finite element methods. The mechanisms of bandgap formation and frequency-dependent energy flow were investigated through mode shape analysis and iso-frequency contours.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Chemistry, Physical
Kodai Matsuoka, Kazuhiro Kajihara, Hirofumi Tanaka
Summary: This study developed a novel and field-applicable method for identifying rail vibration modes and wave propagation characteristics using multipoint hammering and the reciprocity theorem. It clarified the wavelength-frequency relationships of wave propagation, rail frequencies, and mode shapes, demonstrating that rail corrugation is produced by wave interference on the two axles in the bogie.
Article
Materials Science, Multidisciplinary
Xiao-feng Li, Shu-liang Cheng, Ran Wang, Qun Yan, Bin Wang, Yong-tao Sun, Hao Yan, Qing-xin Zhao, Ya-jun Xin
Summary: In this paper, novel two-dimensional single-phase three-ligament, four-ligament and six-ligament chiral structure models are proposed, which are easy to manufacture with few components and have good sound insulation and vibration damping performance. The dispersion information of the structure is calculated using Bloch's theorem and the finite element method. The optimized structure exhibits significantly lower bandgap and wider bandgap width, allowing for multi-frequency and broadband vibration attenuation.
RESULTS IN PHYSICS
(2023)
Article
Acoustics
Yingli Li, Gengwang Yan, Xiaohong Dong, Yong Peng, Xudong Jiang
Summary: Inspired by the advantages of grille structures, this study presents an innovative two-dimensional windmill-like elastic metamaterials (EMs) with multiple resonators for ultrawide bandgap formation at a low frequency. The dispersion relations and mechanism of bandgap formation are investigated using an analytical model. The research provides important clues for the design of vibration isolators, beams, plates, and other devices.
Article
Mechanics
L. H. M. S. Ribeiro, V. F. Dal Poggetto, J. R. F. Arruda
Summary: Vibration must be considered in structural design, and periodic structures can attenuate waves through wave propagation phenomena. The geometric and material properties of the unit cell in periodic structures are crucial for design. Robust optimal design can mitigate the impact of parameter variations on the objective function.
Article
Construction & Building Technology
Xin Gao, Qiang Yi, Jiaxin Lei, Ping Wang, Caiyou Zhao
Summary: This paper measures and analyzes the vibration in the urban metro turnout area using on-site experimental methods, and compares the effects of vibration isolation fasteners and steel-spring floating slabs. By employing an energy evaluation method, it also analyzes the vibration propagation characteristics on the nonisolated turnout frog section, providing important data for vibration control.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Physics, Multidisciplinary
Hao-Xuan Ding, Gui-Lin She, Yi-Wen Zhang
Summary: This paper investigates the nonlinear bifurcation buckling and primary resonance of functionally graded material fluid-conveying pipes under different boundary conditions. The effects of temperature changes, elastic foundations, fluid velocity, functionally graded index, and initial geometric imperfections on the bifurcation buckling and resonance behaviors are analyzed. The study provides meaningful conclusions for the design and analysis of such pipes.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Physics, Applied
Mattia Cenedese, Edoardo Belloni, Francesco Braghin
Summary: This paper investigates the interactions of two mechanisms of bandgap formation in mono-coupled periodic structures - Bragg scattering and local resonators. Analytical study on longitudinal elastic waves describes in detail the formation of bandgaps. Local resonators are implemented via a non-traditional model for higher frequencies, with design maps and tuning formulas developed for both infinite and finite structures.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Acoustics
Vinod Ramakrishnan, Michael J. J. Frazier
Summary: We report on a class of architected material lattices that can independently adjust the local effective mass, damping, and stiffness properties to realize congruent alterations to the acoustic dispersion response post-fabrication. The relation between the tuning element geometry and the achieved variability in effective properties is explored. Bloch's theorem facilitates the dynamic analysis of representative 1D/2D systems, revealing bandgap formation, migration, and closure, and positive/negative metadamping according to the tuning element configuration.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Xiao Ge, Zhengcheng Qin, Xukai Ding, Pu Li, Hongsheng Li
Summary: Studying thermo-mechanical coupling behavior and establishing the thermoelastic damping (TED) model are crucial for improving the quality factor of microelectromechanical resonators. In this work, an analytical TED model for planar frame resonators is developed using the wave propagation approach. The model is validated through comparison with finite element simulations and offers insights into the complex TED behavior of frame structures. Practical design conclusions for high Q-factor resonators are drawn based on the TED behavior of frame structures as summarized from the numerical study.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Civil
Zsuzsa B. Pap, Laszlo P. Kollar
Summary: This article analyzes a simplified model consisting of an infinitely long, axially constrained bar connected to a mass-spring system, and derives an analytical solution as well as impedance functions. The model, which depends on only three parameters, is shown to be an excellent tool for determining the response of structures excited by horizontal harmonic or earthquake loads, especially when considering soil-structure interaction.
Article
Mechanics
Rajan Prasad, Ajinkya Baxy, Arnab Banerjee
Summary: This study proposes a unique configuration of a two-dimensional metamaterial lattice grid and analyzes the propagation of elastic waves in the structure. The results show that a complete band gap can be tailored in a homogeneous structure with a suitable combination of curvature and taper, and the double taper cross section has wider attenuation characteristics than the single taper cross section. Additional characteristics of the proposed metamaterial in the time and frequency domain of the finite structure are also studied.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2022)
Article
Construction & Building Technology
Rongning Cao, Meng Ma, Xiaojing Sun, Jialiang Chen
Summary: This study aimed to investigate the transmission characteristics of vibrations in buildings by using wave propagation analysis. The building was modeled as a periodic structure and a response transfer function (RTF) database of 140 simplified typical residential buildings was established. The results indicated that the vibration transmission laws were influenced by the mode shapes of structures, the participation of modes, and the spectral characteristics of the input excitation.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Wei Liu, Nan Wang, Yongnan Chen, Zhimin Hou, Qinyang Zhao, Wenbo Ouyang, Yan Kang, Gang Wu, Lixia Zhu, Yongqing Zhao
Summary: This paper investigates the damping performance of typical titanium alloys at cryogenic temperatures using micro harmonic vibration. The effects of vibration modulus at different frequencies are analyzed, and the crack propagation mechanism is discussed. The increase of internal dislocations improves damping performance and leads to interface cracking, which is correlated with frequency. The aggregation of dislocations at the interface causes interface cracks and transgranular fractures in the b phase, while dislocations in the a phase activate and glide toward the boundary, resulting in intergranular fractures. The crack propagation of the a phase exhibits hysteresis behavior compared to the b phase during harmonic vibration. At -60°C with 200 Hz, the deflected second crack tip of the beta phase consumes higher harmonic vibration energy, slowing down the crack growth rate and reaching peak damping performance. The study provides experimental data and theoretical support for the vibration damping behavior of typical titanium alloys at cryogenic temperature.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Multidisciplinary Sciences
Hangyuan Lv, Shangjie Li, Xianzhen Huang, Zhongliang Yu
Summary: This paper employs and develops an exact wave-based vibration analysis approach to investigate the propagation properties of a designed finite lightweight locally resonant (LR) beam. By deriving the propagation, reflection, and transmission matrices of the structural discontinuities, the approach accurately describes the vibration of the LR beam and efficiently solves a set of matrix equations. The accuracy of the developed approach is validated using finite element method and the influence of main parameters on the LR beam is studied.
Article
Engineering, Civil
Renbing An, Jiacong Yuan, Yi Pan, Duhang Yi
Summary: Traditional timber structures built on sloped land are more susceptible to seismic damage compared to structures built on flat land. The upper portion of the structure is found to be the weak point on sloped land, with potential issues such as tenon failure and column foot sliding.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Elyas Bayat, Federica Tubino
Summary: The current design guidelines for assessing floor vibration performance do not consider the influence of variability in the walking path on the dynamic response of floors. This study investigates the dynamic response of floors under a single pedestrian walking load, taking into account the randomness of the walking path and load. The effectiveness of the current guidelines in predicting floor response is critically assessed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Gao Ma, Chunxu Hou, Hyeon-Jong Hwang, Linghui Chen, Zhenhao Zhang
Summary: Minimizing earthquake damage and improving repair efficiency are the main principles of resilient structures. This study proposed a repairable column with UHPC segments and replaceable energy dissipaters. The test results showed that the columns with UHPC segments and replaceable dissipaters exhibited high strength, deformation capacity, and energy dissipation.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Kartheek S. M. Sonti, Pavan Kumar Penumakala, Suresh Kumar Reddy Narala, S. Vincent
Summary: In this study, the compressive behavior of alumina hollow particles reinforced aluminum matrix syntactic foams (AMSF) was investigated using analytical, numerical, and experimental methods. The results showed that the FE solver ABAQUS could accurately predict the elastic and elastio-plastic behavior of AMSFs. The study also suggested that FE models have great potential in developing new materials and composites under compression loading.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Zheqi Peng, Xin Wang, Zhishen Wu
Summary: In this study, the statistical modeling of fiber-reinforced polymer (FRP) cables using the classic fiber bundle model is explored. The study considers important features of large-scale multi-tendon FRP cables, such as initial random slack and uneven tensile deformation among tendons. A parametric study and reliability analysis are conducted to predict the load-displacement relation and design thousand-meter-scale FRP cables. The study emphasizes the relation between the reliability index beta of the cable and the safety factor gamma of the FRP material.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Yanchao Shi, Shaozeng Liu, Ye Hu, Zhong-Xian Li, Yang Ding
Summary: This paper introduces a damage assessment method for reinforced concrete (RC) columns under blast loading, using modal parameter measurement as the evaluation index. The validity of the proposed method is validated through numerical and experimental analysis. The results show that this modal-based damage assessment method is applicable for non-destructive evaluation of blast-induced damage of RC columns.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Xiaolin Zou, Maosheng Gong, Zhanxuan Zuo, Qifang Liu
Summary: This paper proposes an efficient framework for assessing the collapse capacity of structures in earthquake engineering. The framework is based on an accurate equivalent single-degree-of-freedom (ESDOF) system, calibrated by a meta-heuristic optimization method. The proposed framework has been validated through case studies, confirming its accuracy and efficiency.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jie Hu, Weiping Wen, Chenyu Zhang, Changhai Zhai, Shunshun Pei, Zhenghui Wang
Summary: A deep learning-based rapid peak seismic response prediction model is proposed for the most common two-story and three-span subway stations. The model predicts the peak seismic responses of subway stations using a data-driven approach and limited information, achieving good predictive performance and generalization ability, and demonstrating significantly higher computational efficiency compared to numerical simulation methods.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jin Ho Lee, Jeong-Rae Cho
Summary: A simplified model is proposed to estimate the earthquake responses of a rectangular liquid storage tank considering the fluid-structure interactions. The complex three-dimensional structural behavior of the tank is represented by a combination of fundamental modes of a rectangular-ring-shaped frame structure and a cantilever beam. The system's governing equation is derived, and earthquake responses such as deflection, hydrodynamic pressure, base shear, and overturning moment are obtained from the solution.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
W. J. Lewis, J. M. Russell, T. Q. Li
Summary: The work discusses the key features and advantages of optimal 2-pin arches shaped by statistically prevalent load and constant axial stress. It extends the design space of symmetric arches to cover asymmetric forms and provides minimum values of constant stress for form-finding of such arches made of different materials. The analysis shows that constant stress arches exhibit minimal stress response and have potential implications for sustainability and durability of future infrastructure.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Wen-ming Zhang, Han-xu Zou, Jia-qi Chang, Tian-cheng Liu
Summary: Saddle position is crucial in the construction and control of suspension bridges. This study proposes an analytical approach to estimate the saddle positions in the completed bridge state and discusses the calculation under different definitions. The relationship between the saddle position and the tower's centerline is analyzed, along with the eccentric compression of the tower. The feasibility of the proposed method is verified through a real-life suspension bridge.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Shaise K. John, Alessio Cascardi, Yashida Nadir
Summary: This study experimentally investigated the use of TRM material for reinforcing concrete columns. The results showed that increasing the number of textile layers effectively increased the axial strength. Additionally, the choice of fiber type and hybrid textile configuration also had a significant impact on strength improvement. A new design model that considers the effects of both the confining matrix and textile was proposed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chandrashekhar Lakavath, S. Suriya Prakash
Summary: This study experimentally investigated the shear behavior of post-tensioned UHPFRC girders, considering factors such as prestress level, fiber volume fraction, and types of steel fibers. The results showed that increasing prestress and fiber dosage could enhance the ultimate load-carrying capacity of the girders, reduce crack angle, and increase shear cracking load.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Vahid Goodarzimehr, Siamak Talatahari, Saeed Shojaee, Amir H. Gandomi
Summary: In this paper, an Improved Marine Predators Algorithm (IMPA) is proposed for size and shape optimization of truss structures subject to natural frequency constraints. The results indicate that IMPA performs better in solving these nonlinear structural optimization problems compared to other state-of-the-art algorithms.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chun-Xu Qu, Jin-Zhao Jiang, Ting-Hua Yi, Hong-Nan Li
Summary: In this paper, a computer vision-based method is proposed to monitor the deformation and displacement of building structures by obtaining 3D coordinates of surface feature points. The method can acquire a large number of 3D coordinates in a noncontact form, improve the flexibility and density of measurement point layout, and is simple and cost-effective to operate.
ENGINEERING STRUCTURES
(2024)