Lightweight steel floor systems are increasingly being adopted in modern buildings, where vibration serviceability under human-induced loading often governs structural design. This study presents an experimental–numerical investigation to clarify the dynamic mechanisms and serviceability performance of a nontraditional all-steel modular floor system. Two floor modules with identical geometry but different beam and plate sizes were tested to quantify the influence of mass and stiffness on dynamic response. Each module was evaluated in both bare-steel and raised access floor (RAF) configurations, resulting in four experimental cases. Experimental modal analysis was performed using an electrodynamic shaker and a high-resolution measurement grid to identify natural frequencies, damping ratios, and governing mode shapes. Results demonstrate that the low-frequency response of the all-steel modules is dominated by plate-controlled and coupled plate–beam vibration modes and that the primary beam-bending mode does not necessarily occur as the fundamental frequency, in contrast to common assumptions for conventional composite floor systems. Measured damping ratios were low for bare modules, indicating heightened sensitivity to vibration serviceability, while installation of the RAF consistently increased damping and produced mode-dependent shifts in natural frequencies. Calibrated finite-element models were developed to reproduce the experimental modal characteristics and provide a validated framework for evaluating walking-induced vibration response. In addition, the modeling approach explicitly captures plate–beam interaction mechanisms that govern the response of lightweight all-steel floor systems. The primary contribution of this work is the combined experimental characterization and validated modeling of an all-steel modular floor concept, together with the identification of the governing vibration mechanisms and the influence of architectural floor layers on damping behavior. These findings provide new insights into the dynamic behavior and serviceability performance of all-steel floor systems and offer a foundation for evaluating and designing nontraditional modular floor systems where traditional composite floor assumptions may not be applicable.
The steel-reinforced concrete stiffened transfer system in the Beijing-Hangzhou Grand Canal Museum features a complex annular vierendeel truss and cantilever wall-columns supporting a 9–15 story mountain-shaped frame. To validate its structural performance, static monotonic loading tests were conducted on 1:8 and 1:7 scale models. Results demonstrate that the annular truss exhibits exceptional load redistribution capacity, with internal force ratios varying from 0.4 to 2.4 under uniform loading. The cantilever transfer wall-columns sustained vertical loads up to 2.0 times the design load (2F) without shear failure, displaying a ductile flexural failure mode. Crucially, the maximum mid-span deflection at the factored load (1.35F) was 8.55mm, accounting for only 71.25% of the 12mm serviceability limit. A high-fidelity finite element (FE) model was developed and validated against experimental data, with discrepancies predominantly below 10%. The findings confirm that the proposed system provides high static robustness, effective deformation control, and superior crack resistance, offering a reliable solution for complex high-rise transfers with stringent architectural and functional demands.
Zhicheng Bai, Xiaoxia Zhao, Xuelin Yang et al.· Journal of engineering and a...· 0 citations
In response to common issues with traditional automotive switches, such as poor contact of terminals, low durability, and weak vibration resistance, this paper proposes and designs a novel high-performance automotive toggle switch. Through structural design and parameter optimization, a new solution is provided to enhance the structural strength and service life of automotive electronic components. After completing three-dimensional modeling based on SolidWorks 2025, a full set of simulation analyses was carried out using ANSYS Workbench 2024 R2. After structural optimization, the maximum stress of the core valve stem decreased from 17.19 MPa to 14.877 MPa, a reduction of 13.5%; meanwhile, the fatigue life increased to 2.51 times that before optimization, indicating that for polycarbonate materials, a slight reduction in stress can significantly slow the rate of component damage accumulation. The switch’s first-order natural frequency is 1171.7 Hz, and a random vibration analysis of the switch was conducted according to the industry standard ISO 16750-3:2023. Under excitations covering the entire 2000 Hz frequency range, the switch structure did not show deformation or fatigue risks caused by resonance, indirectly confirming that vibration energy density is often more concentrated at low frequencies. This study not only completes the innovative design and performance verification of the novel toggle switch but also demonstrates that the comprehensive research methods employed provide a systematic analytical approach for developing high-performance, highly reliable automotive electronic components under stringent industry standards.
Ziyi Liu, Zhongpeng Zheng, Rongfan Dai et al.· Applied Sciences· 0 citations
Structural failures caused by fatigue represent one of the main challenges in heavy industrial equipment operating under severe loading conditions. This study evaluates the structural performance of a Vibrocat head carriage subjected to a critical load of 200 kN through Computer-Aided Design (CAD) and Finite Element Analysis (FEA). The original geometry was reconstructed and numerically analyzed using SolidWorks Simulation, considering ASTM A36 structural steel and linear elastic material behavior. The initial results revealed a maximum Von Mises stress of 617.86 MPa and a safety factor of 0.40, confirming the occurrence of localized yielding and explaining the recurrent fatigue failures observed during operation. Based on these findings, the head mounting plate was redesigned and validated under identical boundary conditions. The optimized configuration reduced the maximum stress to 126.63 MPa and increased the safety factor to 1.97, maintaining the component entirely within the elastic regime. The proposed reinforcement proved technically feasible, economically viable, and capable of significantly improving structural reliability and operational safety.
Denilson de Campos Branco da Silva, Edgard Gonçalves Cardoso, Leandro Cardoso Da Silva et al.· Revista edUCA - Revista Mult...· 0 citations
To investigate the dynamic mechanical responses of rail connection components for high-speed railways, a combined numerical simulation and experimental method was adopted in this study. The deformation and stress distribution characteristics of components under typical loading conditions including longitudinal force and rolling force were analyzed. Modal analysis and fatigue life tests were performed on serpentine springs, and four structural schemes with different cross-sectional sizes (DR_1-DR_4) were designed. The effects of cross-sectional parameters on impact response, natural frequency and stiffness evolution were comprehensively studied. Through comparative analysis of multiple schemes, the regulation mechanism of wall thickness and cross-sectional dimension on the dynamic performance of serpentine springs was revealed, and the design defect of blindly increasing cross-sectional sizes was avoided. The results demonstrated that the overall deformation of rail connection components was dominated by serpentine springs, and high-stress concentration zones were distributed at the curved segments of springs. The first six-order natural frequencies of serpentine springs were confined to the range of 500-750 Hz, and the resonance risk was extremely low under normal service conditions. The inner sides of curved sections were confirmed as the weak areas prone to fatigue failure. The optimal matching state between stiffness and mass was realized by the DR_1 scheme, which exhibited the most stable impact response and the mildest stiffness variation, as well as the best comprehensive performance. The obtained findings were provided as sufficient theoretical foundations and experimental supports for the structural optimization, fatigue life assessment and engineering application of rail connection components.
Yuqin Tian· Journal of Vibroengineering· 0 citations
The effect of reinforcement material type and bar diameter on the dynamic response of one-way slab panels is studied in this research work. The experimental program included testing twelve one-way, simply supported slab panels under a low-velocity impact through a 10 kg mass freely falling from a height of 1 m. Three systems of reinforcement were considered: deformed steel bars, GFRP bars, and steel wire ropes. Four specimens were cast for each type of reinforcement, each specimen was reinforced with one of four diameters (6, 8, 12, and 16 mm). Under dynamic excitation, the three-reinforcement series exhibited distinctly different vibration characteristics, with damping ratios, natural frequencies, and peak amplitudes varying in a manner directly related to the stiffness of each reinforcement type. The lowest midspan amplitude values and the highest natural frequency (18.5–16.67 Hz) were achieved by steel-reinforced panels; therefore, it is recommended to use deformed steel bars in reinforcing members when lower vibration amplitude is required. Panels reinforced by 12 mm diameter GFRP bars (G-12) recorded the highest damping ratio (12.5%), meaning that the vibration diminished faster than any other among the twelve specimens. This behavior affirms that reinforcement selection governs not only static load-carrying behavior but also the dynamic resilience of the structural element.
A. M. Ahmed, A. I. Abdulla· Research on Engineering Stru...· 0 citations
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