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SSRN 2022年

作者： Sun, Hao-Kai Gao, Yang Chen, Yong Geotechnical and Structural Engineering Research Center Shandong University Jinan250061 China Key Laboratory for Structure Health Monitoring and Control in Hebei Province Shijiazhuang Tiedao University Shijiazhuang050043 China

The complex geological conditions of tunnels with tunnel boring machine make geological exploration very difficult. To explore the method of predicting the rock mass integrity based on the cutterhead vibration signal, the mapping relationship between the rock mass integrity, cutter forces, and cutterhead vibration was studied by the full-scale rotary cutting machine. Our finding is that the mean amplitude, the single peak value of the normal force, and the RMS values of the cutterhead vibration all increase with ascending rock mass integrity. The average amplitude and single peak value decrease, and the RMS value increase with the increase of the rotation speed. The average amplitude increases, the single peak value decreases, and the RMS value increases as the advance speed increase. We demonstrated that there is an obvious corresponding relationship between the normal force and the vibration, and rock mass and operating parameters have significant effects on the vibration characteristics. © 2022, The Authors. All rights reserved.

关键词： Boring machines (machine tools)

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A long-term vertical displacement prediction method of concrete bridges based on meteorological shared data and optimized GRU model

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Measurement: Journal of the International Measurement Confederation 2025年 253卷

作者： Wang, Xu Xie, Guilin Liu, Wentao Kong, Hu Gao, Yang State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong University Chongqing400074 China School of Civil Engineering Chongqing Jiaotong University Chongqing400074 China China Merchants Chongqing Road Engineering Inspection Center Co. Ltd Chongqing400067 China Department of Civil and Transportation Engineering Hohai University Nanjing210098 China Key Laboratory for Structure Health Monitoring and Control in Hebei Province Shijiazhuang Tiedao University Shijiazhuang050043 China

Based on data from the meteorological shared data platform, this study proposes a method for predicting the long-term vertical displacement (VD) of concrete bridges by integrating the Northern Goshawk Optimization (NGO) algorithm with the Gated Recurrent Unit (GRU) network. This method can be employed to safely assess concrete bridges and recover missing VD data. Specifically, it uses historical meteorological information and time information provided by the meteorological shared data platform (European Centre for Medium-Range Weather Forecasts) to generate the input parameters of the GRU model. It then employs the long-term VD data from the concrete bridge structural health monitoring system to produce the output parameters of the GRU model. Moreover, the hyperparameters for the GRU model training are optimized using the NGO algorithm. Four NGO-GRU models with different input conditions are proposed, taking the long-term VD prediction of a prestressed concrete bridge as a case study and considering the correlation between different meteorological factors and VD and the long-term time-dependent effects on concrete structures. Through a comparative analysis of the model's prediction performance of multiple sensors under different conditions, it is found that the NGO-GRU model achieved the best prediction performance when using a combination of air temperature, time information, air pressure, solar radiation intensity, and wind speed as inputs, with a prediction error of less than 6.00%. Furthermore, compared with the benchmark models, the NGO-GRU model demonstrated the highest accuracy in VD prediction. Under the optimal input conditions, the prediction performance of the NGO-GRU model improved by 16.46% to 46.17% compared with the other models, validating the robustness and effectiveness of the proposed method. © 2025 Elsevier Ltd

关键词： Concrete bridges Long-term monitoring Meteorological shared data Northern goshawk optimization-based GRU Structural health monitoring Vertical displacement

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Macro-microscopic deformation evolution of thawing frozen fine-grained soil used in heavy-haul railway subgrades in cold regions

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Research in Cold and Arid Regions 2025年第02期 97-109页

作者： JianBing Chen ShaoJie Liang YuZhi Zhang XiaoDong Zhu Meng Wang MingTao Jia State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions CCCC First Highway Consultants Co.Ltd. School of Civil Engineering Shijiazhuang Tiedao University Structure Health Monitoring and Control Key Laboratory of Hebei Province Shijiazhuang Tiedao University Collaborative Innovation Center for Performance and Safety of Large-Scale Infrastructure Shijiazhuang Tiedao University School of Safety and Emergency Management Shijiazhuang Tiedao University

During the thawing process of a railway subgrade, bidirectional thawing complicates water-heat transfer, leading to serious thaw settlement issues under train loads. Focusing on the severely frozen section of the ShuozhouHuanghua port heavy-haul railway, this study conducted indoor soil-column laterally-limited compression tests on thawing fine-grained soil specimens to analyze the cumulative deformation during thawing. The deformation evolution was examined from both macroscopic and microscopic perspectives. The test results revealed a significant increase in the water content at the frozen interlayer during thawing, with minimal thaw settlement under no-load conditions. However, under dynamic loads, the thawing soil exhibited rapid settlement during the initial stages of the process. Increasing the dynamic load amplitude did not result in significant additional thaw settlement compression. Particle image velocimetry revealed substantial thaw settlement and compression at the top of thawing soil. Microscopically, the porosity at the top of the specimens significantly decreased, whereas the porosity in the frozen interlayer remained largely unchanged. Under dynamic loading, the specimens exhibited a concentrated distribution of large pores with scattered smaller pores. The phase change from ice to water,combined with dynamic loading, induced particle movement and expanded the inter-particle pore space, leading to macroscopic thaw settlement and soil compression. The findings can provide a theoretical foundation for maintaining and ensuring the safety of railway subgrades in cold regions.

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Experiments on the effect of helical line on the stay-cable vibration at high Reynolds number

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Zhendong yu Chongji/Journal of Vibration and Shock 2018年第14期37卷 175-179页

作者： Liu, Qingkuan Lu, Zhaoliang Tian, Kaiqiang Hu, Bo Ma, Wenyong Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang050043 China Hebei Province Key Lab of Structural Health Monitoring and Control Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China Department of Engineering Mechanics Shijiazhuang Tiedao University Shijiazhuang050043 China

Cable is one of the basic construction members of a cable-stayed bridge. The wind loads on cables constitute a high proportion of total wind loads on the bridge, and the wind-induced vibration is an important problem of great concern in bridge design. Through a self-designed vibration test system for stay-cables, the vibration model tests for a rigid stay-cables model with diameter of 120 mm as well as for 25 kinds models of stay-cables wound with helical lines were conducted in a wind *** changing rule of the vibration amplitude along with the Reynolds number was analyzed. The results show that winding a helical line on the cable can reduce the Reynolds number effects on it. When the helical line winding spacing is constant, the amplitude trends to decrease along with the increase of helical line diameter. When the helical line diameter is constant, the amplitude trends to decrease along with the decrease of helical line winding spacing. The vibration stability is improved with the increase of helical line diameter and the decrease of helical line winding spacing. © 2018, Editorial Office of Journal of Vibration and Shock. All right reserved.

关键词： Reynolds number

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Effects of the reattachment on dry galloping in the critical Reynolds number range 9

Effects of the reattachment on dry galloping in the critical...

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9th Asia Pacific Conference on Wind Engineering, APCWE 2017

作者： Ma, Wenyong Liu, Qingkuan Liu, Xiaobing Key Laboratory for Health Monitoring and Control of Large Structure Shijiazhuang Tiedao University Hebei province China Department of Wind Science and Engineering Shijiazhuang Tiedao University Shijiazhuang City Hebei Province China

Large amplitude vibrations of circular cylinders in the critical Reynolds number range are reproduced in wind tunnels. Displacements and wind pressure for the cylinders are measured synchronously to reveal the characteristics of aerodynamic force for the vibrating cylinders in a Reynolds number range where flow re-attaches on the rear of the cylinder. Effects of these reattachments on the aerodynamic forces and the vibrations are discussed. The results show that the reattachment can produce unsteady aerodynamic force and excite large amplitude vibration when it forms unstable separation bubble at the early critical Reynolds number range. Once it develops stable separation bubble, the reattachment mitigates the vibrations by creating strong negative aerodynamic damping. © 9th Asia Pacific Conference on Wind Engineering, APCWE 2017. All Rights Reserved.

关键词： Circular cylinders

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Research on Remote Automatic monitoring System of High and Steep Slope Based on FBG Tilt Sensor

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IOP Conference Series: Earth and Environmental Science 2019年第4期267卷

作者： Hongbin Xu Feng Li Weigang Zhao Meng Li Yang Gao Bo Zhang School of Civil Engineering Beijing Jiaotong University Beijing 100044 China School of Civil Engineering Wuhan University Wuhan Hubei 430074 China Structure Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang 050043 Hebei China Key Laboratory of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Tiedao University Shijiazhuang Hebei 050043 China

A remote automatic monitoring system for high and steep slope based on FBG tilt sensor was established along Shuohuang railway, and an FBG tilt sensor with a high sensitivity was developed in this monitoring system. The monitoring system is running smoothly, and the monitoring results show that the maximum deformation of the slop is less than 2 mm in the rainy season, slope slip occurs at the location of 9.5 meters above, the overall deformation of slope is small, and the slope is steady.

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Reynolds number effects on mean aerodynamic forces acting on parallel cables of cable-supported bridges

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Gongcheng Lixue/Engineering Mechanics 2017年第3期34卷 189-196页

作者： Du, Xiao-Qing Zhang, Li-Ping Liu, Qing-Kuan Ma, Wen-Yong Liu, Xiao-Bing Department of Civil Engineering Shanghai University Shanghai200072 China Wind Engineering Research Center Shijiazhuang Tiedao University Shijiazhuang050043 China Hebei Province Key Lab of Structural Health Monitoring and Control Shijiazhuang050043 China

Parallel hanger cables and stay cables are used extensively in cable-supported bridges. However, the cross-wind mean lift of downstream cables induced by wake interference received little attention when calculating the wind loads on parallel cables. At Reynolds numbers between 0.9×105~4.6×105 (subcritical Reynolds regime and critical Reynolds regime), the aerodynamic characteristics of twin circular cylinders were investigated along with their relationships with the Reynolds numbers through a series of wind tunnel tests. Results show the mean aerodynamic forces of two circular cylinders in the critical regime were very different from those in the subcritical regime, showing strong Reynolds number effects. Furthermore, at the critical regime, the mean lift coefficients of the downstream circular cylinder discontinuously suffered abrupt change with the increase in the Reynolds number for some arrangements of the cylinders, which might be related to the shift of the flow state between different flow patterns. Under the wake interference of the upstream circular cylinder, the magnitude of the mean lift coefficient on the downstream cylinder was up to 1.25. Therefore, it is necessary to include the effect of mean lift when calculating static wind loads on parallel cables. © 2017, Engineering Mechanics Press. All right reserved.

关键词： Reynolds number

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Experimental research on wind load distribution of four-center-circle coal shed

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Gongcheng Lixue/Engineering Mechanics 2017年 34卷 59-62页

作者： Wang, Xiao-Jiang Zheng, Yun-Fei Liu, Qing-Kuan Liu, Xiao-Bing Ma, Wen-Yong School Of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang050043 China HeBei Province Key Lab of Structure Health Monitoring and Control Shijiazhuang050043 China

According to the requirements of engineering design and experimental research, the wind tunnel tests on a large-span coal shed structure for a thermal power plant were carried out. The influence of wind direction angle on wind-load-shape coefficient was studied. After analyzing the shape coefficient of each measuring point under different working conditions, the wind-load-shape coefficients on the structure surface were obtained. The results showed that: the measuring point had the largest volume coefficient when the angle between the measuring point and the incoming wind was among 30 ~ 40 degree;at different wind direction angles, the coefficients at the top and the edge areas of the model were relatively large, therefore, these areas should be strengthened when building a coal shed. © 2017, Engineering Mechanics Press. All right reserved.

关键词： Coal

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Experimental study on wind pressure distribution and wind-induced interference effects on long-span spherical structure

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Jianzhu Jiegou Xuebao/Journal of Building structures 2016年第10期37卷 140-146页

作者： Liu, Qingkuan Lu, Zhaoliang Zheng, Yunfei Ma, Wenyong Liu, Xiaobing Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang050043 China Key Laboratory for Structure Health Monitoring and Control in Hebei Province Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China

Spherical shell structure is very sensitive to wind loads. The wind load is one of the most important loads in structural design. By wind tunnel tests, simultaneous multi-pressure measurement on surface of spherical shell structure was carried out under different conditions to study the characteristics of wind load distribution and wind-induced interference effects. Results show that opened and closed sunroofs have significant effect on wind pressure distribution on the outer surface of the structure in partial region, especially, leeward side. For the inner surface of the structure, wind pressure become small when sunroof is closed, which is safe for the outer structure. Coal dump has no effect on wind pressure distribution along wind direction, while in cross wind direction it has effect. Different relative positions of adjacent structures have certain influence on wind-induced interference effects and different regions have different effects. © 2016, Editorial Office of Journal of Building structures. All right reserved.

关键词： Wind stress

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The influence of surface roughness on the dry galloping of inclined cables

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Gongcheng Lixue/Engineering Mechanics 2017年 34卷 174-178页

作者： Lu, Zhao-Liang Liu, Xiao-Ling Zheng, Yun-Fei Liu, Qing-Kuan Ma, Wen-Yong Liu, Xiao-Bing School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang050043 China Hebei Province Key Lab of Structural Health Monitoring and Control Shijiazhuang050043 China

Although new cables are covered by smooth polyethylene material, weathering and dust adhesion increase the surface roughness of the cables with the growth of service time. In this paper, the influence of roughness of stay cables on aerodynamic stability was studied. The surface roughness of cables was changed through covering the cable with different sandpapers, and the surface roughness was measured with the SJ-410 high-precision by free vibration wind tunnel test. The influence of surface roughness on the vibration of stay cables at high Reynolds number was studied by vibration experiments. It was shown that the vibration of stay cables was inhibited with the increase of the surface roughness;the Reynolds number effect became weaker with the increase of surface roughness of the stay cable models. © 2017, Engineering Mechanics Press. All right reserved.

关键词： Surface roughness

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