Query：
学者姓名：吴金志
Refining：
Year
Type
Indexed by
Source
Complex
Co-Author
Language
Clean All
Abstract ：
This study introduces a multi-point optical flow cable force measurement method based on Euler motion amplification to address challenges in accurately measuring cable displacement under small displacement conditions and mitigating background interference in complex environments. The proposed method combines phase-based magnification with an optical flow method to enhance small displacement features and improve SNR (signal-to-noise ratio) in cable displacement tracking. By leveraging magnified motion data and integrating auxiliary feature points, the approach compensates for equipment-induced vibrations and background noise, allowing for precise cable displacement measurement and the identification of vibration modes. The methodology was validated using a scaled model of a cable net structure. The results demonstrate the method's effectiveness, achieving a significantly higher SNR (e.g., from 7.5 dB to 22.24 dB) compared to traditional optical flow techniques. Vibration frequency errors were reduced from 6.2% to 1.5%, and cable force errors decreased from 11.38% to 3.13%. The multi-point optical flow cable force measurement method based on Euler motion magnification provides a practical and reliable solution for non-contact cable force measurement, offering potential applications in structural health monitoring and the maintenance of bridges and high-altitude structures.
Keyword ：
displacement tracking displacement tracking non-contact measurement non-contact measurement Euler motion magnification Euler motion magnification multi-point optical flow method multi-point optical flow method vibration frequency analysis vibration frequency analysis cable force measurement cable force measurement
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Wu, Jinzhi , Yan, Bingyi , Xue, Yu et al. Multi-Point Optical Flow Cable Force Measurement Method Based on Euler Motion Magnification [J]. | BUILDINGS , 2025 , 15 (3) . |
| MLA | Wu, Jinzhi et al. "Multi-Point Optical Flow Cable Force Measurement Method Based on Euler Motion Magnification" . | BUILDINGS 15 . 3 (2025) . |
| APA | Wu, Jinzhi , Yan, Bingyi , Xue, Yu , Qin, Jie , You, Deqing , Sun, Guojun . Multi-Point Optical Flow Cable Force Measurement Method Based on Euler Motion Magnification . | BUILDINGS , 2025 , 15 (3) . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
The incorporation of sliding cables and rigid bodies into tensegrity systems introduces new design opportunities but also poses challenges in form-finding. This paper presents a unified, energy-based framework for formfinding of general tensegrity structures under various initial conditions. The treatment of different element types is unified by using a common set of independent unknown parameters that describe the positions of all different elements. A series of potential energy functions for different element types, each with varying initial conditions, are formulated in terms of these shared parameters. The equilibrium equations for general tensegrity structures, regardless of their initial conditions or element types, are derived based on the principle of stationary potential energy. These equations are solved using the Levenberg-Marquardt (LM) algorithm, which exhibits global convergence and high robustness. The structural stability is assessed by analyzing the Hessian matrix of the total potential energy. Several representative numerical examples are presented to validate the effectiveness of the proposed framework. The results indicate that the proposed method is capable of general tensegrity structures with complex element types (i.e., sliding cables, rigid bodies), while also accommodating different initial conditions (i.e., element forces, final lengths, force densities, and rest lengths with stiffness).
Keyword ：
Potential energy Potential energy General tensegrity General tensegrity Form-finding Form-finding Sliding cable Sliding cable Rigid body Rigid body
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Xue, Yu , Wang, Yafeng , Wang, Wei et al. A unified energy-based framework for form-finding of general tensegrity structures with sliding cables and rigid bodies [J]. | ENGINEERING STRUCTURES , 2025 , 334 . |
| MLA | Xue, Yu et al. "A unified energy-based framework for form-finding of general tensegrity structures with sliding cables and rigid bodies" . | ENGINEERING STRUCTURES 334 (2025) . |
| APA | Xue, Yu , Wang, Yafeng , Wang, Wei , Sun, Guojun , Wu, Jinzhi , Luo, Yaozhi . A unified energy-based framework for form-finding of general tensegrity structures with sliding cables and rigid bodies . | ENGINEERING STRUCTURES , 2025 , 334 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
Commonly used methods for identifying modal parameters under environmental excitations assume that the unknown environmental input is a stationary white noise sequence. For large-scale civil structures, actual environmental excitations, such as wind gusts and impact loads, cannot usually meet this condition, and exhibit obvious non-stationary and non-white-noise characteristics. The theoretical basis of the stochastic subspace method is the state-space equation in the time domain, while the state-space equation of the system is only applicable to linear systems. Therefore, under non-smooth excitation, this paper proposes a stochastic subspace method based on RDT. Firstly, this paper uses the random decrement technique of non-stationary excitation to obtain the free attenuation response of the response signal, and then uses the stochastic subspace identification (SSI) method to identify the modal parameters. This not only improves the signal-to-noise ratio of the signal, but also improves the computational efficiency significantly. A non-stationary excitation is applied to the spatial grid structure model, and the RDT-SSI method is used to identify the modal parameters. The identification results show that the proposed method can solve the problem of identifying structural modal parameters under non-stationary excitation. This method is applied to the actual health monitoring of stadium grids, and can also obtain better identification results in frequency, damping ratio, and vibration mode, while also significantly improving computational efficiency.
Keyword ：
RDT-SSI RDT-SSI random decrement technique random decrement technique non-stationary excitation non-stationary excitation stochastic subspace identification method stochastic subspace identification method modal parameter identification modal parameter identification
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Wu, Jinzhi , Hu, Jie , Ma, Ming et al. Modal Parameter Identification of the Improved Random Decrement Technique-Stochastic Subspace Identification Method Under Non-Stationary Excitation [J]. | APPLIED SCIENCES-BASEL , 2025 , 15 (3) . |
| MLA | Wu, Jinzhi et al. "Modal Parameter Identification of the Improved Random Decrement Technique-Stochastic Subspace Identification Method Under Non-Stationary Excitation" . | APPLIED SCIENCES-BASEL 15 . 3 (2025) . |
| APA | Wu, Jinzhi , Hu, Jie , Ma, Ming , Zhang, Chengfei , Ma, Zenan , Zhou, Chunjuan et al. Modal Parameter Identification of the Improved Random Decrement Technique-Stochastic Subspace Identification Method Under Non-Stationary Excitation . | APPLIED SCIENCES-BASEL , 2025 , 15 (3) . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
Cable structures are widely used in large-span constructions due to their flexible shapes, high strength, and lightweight. However, the high-temperature performance of cable-clamped joints affects the overall fire resistance of cable structures. Moreover, the galvanized layer of cable may melt at high temperatures, which decreases the anti-slip capacity. But, the influence of the galvanized layer on the high-temperature anti-slip capacity has not been studied. In this study, the high-temperature anti-slip capacity of a commonly used type of galvanized cable-clamped joints is investigated by various high-temperature experiments. It is found that the anti-slip bearing capacity of the new cable-clamped joint at 300 degrees C is 60.30%, which is lower than that at the normal temperature. Compared with existing studies, the results at normal temperature are in good agreement with the theoretical values obtained from literature, which validates the correctness of the experimental system. The difference between the high-temperature test results and the theoretical formula calculations is significant, with the minimum difference reaching 28.5%. Furthermore, the anti-slip bearing capacity of the cable-clamp joint decreases as the thickness of the zinc coating at high temperatures. Therefore, galvanized layer thickness and high temperature should be considered in the assessment of the high-temperature performance of cable structures. Compared with the research conclusions of domestic scholars, it can be seen that the test results in this paper are more reliable, which can provide a useful reference for the design of cable structures.
Keyword ：
Semi-circular plate-type cable-clamp joint Semi-circular plate-type cable-clamp joint Anti-slip experiment Anti-slip experiment Zinc coating Zinc coating High-temperature effect High-temperature effect Ultimate bearing capacity Ultimate bearing capacity
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Sun, Guojun , Lin, Yujia , Wu, Jinzhi et al. Experimental study on anti-slip performance of galvanized cable-clamped joint at elevated temperature [J]. | SCIENTIFIC REPORTS , 2025 , 15 (1) . |
| MLA | Sun, Guojun et al. "Experimental study on anti-slip performance of galvanized cable-clamped joint at elevated temperature" . | SCIENTIFIC REPORTS 15 . 1 (2025) . |
| APA | Sun, Guojun , Lin, Yujia , Wu, Jinzhi , Xiao, Shuo , Xue, Yu . Experimental study on anti-slip performance of galvanized cable-clamped joint at elevated temperature . | SCIENTIFIC REPORTS , 2025 , 15 (1) . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
In structural health monitoring, because the number of sensors used is far lower than the number of degrees of freedom of the structure being monitored, the optimization problem of the location and number of sensors in the structures is becoming more and more prominent. However, spatial grid structures are complex and diverse, and their dynamic characteristics are complex. It is difficult to accurately measure their vibration information. Therefore, an appropriate optimization method must be used to determine the optimal positioning of sensor placement. Aiming at the problem that spatial grid structures have many degrees of freedom and the fact that it is difficult to obtain complete vibration information, this paper analyzed the typical EI method, MKE method, and EI-MKE method in the arrangement of the measuring points, and it was verified that the EI method was more suitable for the vibration detection of spatial grid structures through the example of a plane truss and spatial grid structures. Measuring points under the assumption of structural damage were explored, and it was proposed that there might have been a stable number of measuring points that could cover the possible vibration mode changes in the structures. At the same time, combined with the three-level improved Guyan recursive technique, in order to obtain better complete modal parameters, the influence of the number of measuring points on the complete vibration mode information was studied. It was concluded that MACd was better than MACn as the quantitative target.
Keyword ：
spatial grid structures spatial grid structures vibration mode expansion vibration mode expansion modal identification modal identification layout of measuring points layout of measuring points
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Zhou, Chunjuan , Wu, Jinzhi , Sun, Guojun et al. Research on Arrangement of Measuring Points for Modal Identification of Spatial Grid Structures [J]. | BUILDINGS , 2024 , 14 (8) . |
| MLA | Zhou, Chunjuan et al. "Research on Arrangement of Measuring Points for Modal Identification of Spatial Grid Structures" . | BUILDINGS 14 . 8 (2024) . |
| APA | Zhou, Chunjuan , Wu, Jinzhi , Sun, Guojun , Hu, Jie , Xu, Qize , Li, Yang et al. Research on Arrangement of Measuring Points for Modal Identification of Spatial Grid Structures . | BUILDINGS , 2024 , 14 (8) . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
This study aims to analysis the dynamic characteristics and seismic collapse behavior of aluminum alloy reticulated shell structures especially pay attention to the failure mechanism in the failure stages. The collapse process of shell under strong seismic was studied by shaking table experiment, and the seismic response and collapse of structures were obtained. By establishing the finite element model of the shell, the internal force changes, collapse mechanism of the rod under seismic are analyzed. The seismic response differences of reticulated shells under different rise-span ratios and initial defects were analyzed. Then, the performance differences between aluminum alloy reticulated shells and steel reticulated shells in natural frequency and seismic response are compared. The results show that the vertical deformation of the reticulated shell is small before the collapse, which is mainly the rotation of the joint and the in-plane bending deformation of the rods. The frequency is not significantly reduced before and after the collapse, and the stiffness is still large after the failure. With the increase of the rise-span ratio, the collapse load decreases first and then increases. Considering the initial defects, the collapse load of the reticulated shell structure is significantly reduced. The natural vibration period of the aluminum alloy reticulated shell is larger than that of the steel reticulated shell.
Keyword ：
Seismic performance Seismic performance Collapse mechanism Collapse mechanism Dynamic behavior Dynamic behavior Aluminum alloy reticulated shell Aluminum alloy reticulated shell Shaking table experiment Shaking table experiment
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Sun, Guojun , Xiao, Shuo , Wu, Jinzhi et al. Experimental and numerical simulation on seismic failure of aluminum alloy reticulated shell [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 221 . |
| MLA | Sun, Guojun et al. "Experimental and numerical simulation on seismic failure of aluminum alloy reticulated shell" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 221 (2024) . |
| APA | Sun, Guojun , Xiao, Shuo , Wu, Jinzhi , Zheng, Jianhua , Qin, Jie . Experimental and numerical simulation on seismic failure of aluminum alloy reticulated shell . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 221 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
In the identification process of SSI-DATA method, the stabilization diagram is generally used to determine the order of the system. However, in the modal parameter identification of spatial grid structure, there are few stable points that meet the requirements, and the stability axis is not obvious. So, the location of the modal stability point cannot be determined. Furthermore, the QR decomposition of the Hankel matrix is computationally inefficient and difficult to use for online identification when analyzing the spatial structure. In order to solve the above problems, this paper proposes a time-saving random subspace method of spatial grid structure based on an improved stabilization diagram. On the basis of the traditional random subspace method, the projection of the Hankel matrix is transformed into the projection transformation of its R matrix, and then the subsequent calculation is carried out. Then, the frequency search domain is set and the auxiliary stability axis is made. According to the spectrum peak, stabilization diagram and the auxiliary stability axis, the position of the stability axis is comprehensively judged. The modal parameters of the structure can be identified more accurately, which improves the calculation efficiency and avoids modal omissions or misjudgments to a certain extent. Using a spatial structure model (upper chord 18 x 12m, lower chord 16 x 10m, grid 2 x 1.5m), the advantages of this method were compared and verified. The results indicate that the calculation time of the traditional SSI-DATA method is 29.077s, while the improved calculation time is 3.752s, resulting in an 87.1% improvement in calculation efficiency, while also preventing mode omission and misjudgment. By further applying this method to vibration monitoring of spatial grid structure hangars, its applicability, higher computational efficiency, and precision have been proven.
Keyword ：
stabilization diagram stabilization diagram stochastic subspace identification stochastic subspace identification Modal parameter identification Modal parameter identification spatial grid structure spatial grid structure
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Wu, Jinzhi , Ma, Zenan , Sun, Guojun et al. A Time-Saving Stochastic Subspace Identification Method for Spatial Grid Structure [J]. | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS , 2024 . |
| MLA | Wu, Jinzhi et al. "A Time-Saving Stochastic Subspace Identification Method for Spatial Grid Structure" . | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS (2024) . |
| APA | Wu, Jinzhi , Ma, Zenan , Sun, Guojun , Ma, Ming , Hu, Jie , Liu, Mingliang et al. A Time-Saving Stochastic Subspace Identification Method for Spatial Grid Structure . | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS , 2024 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
This study investigated the high-temperature mechanical properties and collaborative working mechanism of zinc-5% aluminum-mixed mischmetal alloy-coated steel strand cables (M-C cables) and internal steel wires by numerical analysis, based on the experimental data for the high-temperature mechanical properties of steel wire. The high-temperature mechanical properties of zinc-5% aluminum-mixed mischmetal alloy-coated steel (M-C steel) with round and Z-shape cross-section shapes were studied in the temperature range of 30-800 degrees C using the constant temperature loading test method. The two-stage Ramberg-Osgood model for M-C steel wires at elevated temperatures is proposed for modeling of the M-C steel wires. Furthermore, the equations for the reduction in the nominal yield strength, elastic modulus and ultimate strength for M-C steel wires at elevated temperatures are proposed. Numerical analysis and investigation of the high-temperature mechanical properties of normal M-C cables and locked M-C cables under eight temperature conditions are carried out. Based on the high-temperature constitutive relationship of the round and Z-shaped M-C steel wires obtained experimentally, the thermostatic drawing process is simulated at different temperatures for two types of M-C cables. The high-temperature stress-strain relationship between the two and the relevant high-temperature mechanical performance index were obtained. According to the numerical simulation results, the energy, contact stress distribution and radial displacement deformation of M-C cables under the different temperature condition were evaluated and analyzed. The collaborative working mechanism of M-C cabled affected by temperature was revealed.
Keyword ：
High temperature mechanical properties High temperature mechanical properties Zinc-5% aluminum-mixed mischmetal alloy-coated Zinc-5% aluminum-mixed mischmetal alloy-coated Collaborative working mechanism Collaborative working mechanism Steel strand cables Steel strand cables
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Sun, Guojun , Li, Zhihao , Wu, Jinzhi et al. Investigation of steel wire mechanical behavior and collaborative mechanism under high temperature [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2021 , 188 . |
| MLA | Sun, Guojun et al. "Investigation of steel wire mechanical behavior and collaborative mechanism under high temperature" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 188 (2021) . |
| APA | Sun, Guojun , Li, Zhihao , Wu, Jinzhi , Ren, Jingying . Investigation of steel wire mechanical behavior and collaborative mechanism under high temperature . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2021 , 188 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
Galfan-coated steel cables are widely used in prestressed structures due to their excellent mechanical properties and corrosion resistance. Their postfire mechanical properties are important to evaluate the residual load-bearing capability of the structures after fire. However, the research on the postfire mechanical properties of Galfan-coated steel cables is stillscarce, especially the cable in stress state. Hence, a research based on experimental study was carried out to investigate the deterioration of mechanical properties of Galfan-coated steel cables in stress state after experiencing elevated temperatures in this paper. Eighteen tensile tests were conducted on specimens exposed to elevated temperatures varying from 100 degrees C to 500 degrees C and then cooled down to ambient temperature in air. Both twisting characteristic and constant stress level of Galfan-coated steel cables were considered in this study. The residual nominal yield strength, ultimate strength, elastic modulus, fracture strain, and stress-strain curves of Galfan-coated steel cables after experiencing elevated temperatures were obtained and compared with the existing researches. The results show that the postfire mechanical properties are obviously decreased when the fire temperature exceeds 300 degrees C. Equations for the residual nominal yield strength, elastic modulus, ultimate strength, and fracture strain of the Galfan-coated steel cables were proposed. Furthermore, a modified two-stage Ramberg-Osgood model for Galfan-coated steel cables after experiencing elevated temperatures was established, which can provide reference for the safety assessment and repairment of prestressed structures after fire.
Keyword ：
mechanical properties mechanical properties experimental researchGalfan-coated steel cables experimental researchGalfan-coated steel cables postfirestress-strain curve postfirestress-strain curve
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Sun, Guojun , Li, Xiaohui , Wu, Jinzhi . Postfire mechanical properties of Galfan-coated steel cables [J]. | FIRE AND MATERIALS , 2020 , 44 (7) : 909-922 . |
| MLA | Sun, Guojun et al. "Postfire mechanical properties of Galfan-coated steel cables" . | FIRE AND MATERIALS 44 . 7 (2020) : 909-922 . |
| APA | Sun, Guojun , Li, Xiaohui , Wu, Jinzhi . Postfire mechanical properties of Galfan-coated steel cables . | FIRE AND MATERIALS , 2020 , 44 (7) , 909-922 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
Investigation of the mechanical properties of steel rods at elevated temperatures is important for the fire-resistant design and fire simulation analysis of steel rod structures. In China, GLG650 denotes a steel rod whose yield strength is not less than 650 MPa. A 35CrMo-GLG650 steel rod is manufactured with 35CrMo alloy structural steel using quenching and tempering methods. To investigate the mechanical properties of 35CrMo-GLG650 steel rods at elevated temperatures, tensile tests of four specimens are performed at 100 degrees C, 200 degrees C, 300 degrees C, 400 degrees C, 500 degrees C, 600 degrees C, and 30 degrees C. The test results show that the 35CrMo-GLG650 steel rods at 30 degrees C and elevated temperatures exhibit typical nonlinear characteristics with no obvious yield plateau. The mechanical properties of the 35CrMo-GLG650 steel rods at elevated temperature are obtained, and they are compared with those of other high-strength steels. When the temperature is below 300 degrees C, the reductions in the mechanical properties of the specimens are approximately 0.9. However, the mechanical properties of the specimens change significantly when the temperature exceeds 300 degrees C. At 600 degrees C, the reduction factors of the yield strength, ultimate strength, and elastic modulus are 0.56, 0.46, and 0.45, respectively. In this paper, equations for the nominal yield strength, elastic modulus, and ultimate strength of 35CrMo-GLG650 steel rods at elevated temperatures are proposed. Furthermore, a modified two-stage Ramberg-Osgood model for 35CrMo-GLG650 steel rods at ambient and elevated temperatures is proposed that can act as a reference for the steel rod structure at elevated temperatures.
Keyword ：
Stress-strain curve Stress-strain curve Mechanical property Mechanical property Elevated temperature Elevated temperature 35CrMo-GLG650 35CrMo-GLG650 Steel rods Steel rods Elastic modulus Elastic modulus
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Sun, Guojun , Wu, Mingze , Wu, Jinzhi et al. Experimental Study on Mechanical Properties of 35CrMo-GLG650 Steel Rods at Elevated Temperatures [J]. | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2020 , 32 (7) . |
| MLA | Sun, Guojun et al. "Experimental Study on Mechanical Properties of 35CrMo-GLG650 Steel Rods at Elevated Temperatures" . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING 32 . 7 (2020) . |
| APA | Sun, Guojun , Wu, Mingze , Wu, Jinzhi , Chen, Ronghua . Experimental Study on Mechanical Properties of 35CrMo-GLG650 Steel Rods at Elevated Temperatures . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2020 , 32 (7) . |
| Export to | NoteExpress RIS BibTex |
Export
| Results： |
Selected to |
| Format： |
