Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes

Shantou, China

Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes

Shantou, China
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Hong C.-Y.,Shanghai University | Hong C.-Y.,Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes | Zhang Y.-F.,Donghua University | Zhang Y.-F.,Key Laboratory of Functional Textiles | And 3 more authors.
Sensors and Actuators, A: Physical | Year: 2017

Distributed optical fiber sensors (DOFS) have been attracted significant attention from geotechnical engineering communities for a few decades. Innovative development of structural design, encapsulation and implementation methods of optical fiber sensors leads to many new applications in geotechnical monitoring field. This paper presents a comprehensive review of Brillouin based DOFS for health monitoring of various geotechnical structures include geotextiles, soil nails, anchors, pipelines, piles, retaining walls, tunnels, and landslides. Recent application status of using two successful commercialized technologies including Brillouin Optical Time Domain Reflectometry (BOTDR) and Brillouin Optical Time Domain Analysis (BOTDA) for geotechnical health monitoring was reviewed and discussed in details. Particular emphasis was given to sensor design, encapsulation, and installation methods of DOFS in various successful geotechnical applications. Comparison analysis regarding typical advantages and limitations of different technologies (DOFS, fiber Bragg grating sensors, and conventional sensors) for geotechnical health monitoring was also presented and discussed in this paper. © 2017 Elsevier B.V.


Hong C.,Shanghai University | Hong C.,China Earthquake Administration | Hong C.,Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes | Yin J.,Hong Kong Polytechnic University | And 4 more authors.
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2016

To investigate the correlation between peak pullout resistance of soil nails and some key parameters, and quantify the influences of grouting pressure, overburden stress and dilation angle of soils on the peak pullout resistance of soil nails, the correlation between cavity expansion theory and surrounding pressure on failure surface of soil nails was firstly proposed. Then, the relationship of the normal stress on the failure surface and peak pullout resistance of soil nails was derived according to Mohr-Column failure theory. In addition, the calculation method for peak pullout resistance was validated by laboratory test data and model data. Finally, a parametric study was carried out according to the proposed simple model to investigate the influence of different parameters on the peak pullout resistance of soil nails. This model was simple to be used in the design. Parametric study indicates that the grouting pressure, overburden stress and failure surface distance have interactive influence on the peak pullout resistance of soil nails, and their increasing rates under grouting pressure are much larger than that without grouting pressure. © 2016, Editorial Department of Journal of Southeast University. All right reserved.


Zhang Y.-F.,Donghua University | Zhang Y.-F.,Zhongyuan University of Technology | Zhang Y.-F.,Shanghai University | Hong C.-Y.,Donghua University | And 4 more authors.
Measurement: Journal of the International Measurement Confederation | Year: 2017

Fused deposition modeling (FDM) is an important technology for 3D printing and can be used for rapidly production of functional parts. This paper presents a fiber Bragg grating (FBG) based sensing platform fabricated using FDM method. This sensing platform include a number of pressure sensing components fabricated by layering of extruded Polylactic Acid (PLA) materials. FBG sensors were fixed at center of each sensing component for pressure measurement. Performance of the sensing system was calibrated by applying step by step load on FBG pressure sensors. After calibration, this sensing platform was used to monitor plantar pressure distribution arise from weight gaining and losing processes of a female subject. It is found that plantar pressure of heel is almost twice the pressure magnitudes of both the first and second metatarsus (fore-foot), while there is limited pressure at the mid-foot position during weight gaining process. Pressures of the two metatarsus areas are around 50% (pressure ratio) of heel position and decrease continuously as the increase of subject weight, but weight losing process has very limited influence on this pressure ratio. Center of gravity of this female subject was also found to shift backward substantially during weighting gaining process. Therefore, protection of the heel position is highly important during both weight gaining and losing processes due to the presence of significant pressure concentration. © 2017 Elsevier Ltd


Li G.,Shantou University | Li G.,Hong Kong University of Science and Technology | Wang Z.,Shantou University | Wang Z.,Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes | And 7 more authors.
Journal of Cleaner Production | Year: 2015

Using waste rubbers as aggregates in concrete is a feasible approach to recycle the material. However, due to the poor adhesion of rubber to cement paste, the replacement of normal aggregate with rubber will lead to a reduction in the mechanical strength of concrete. This paper presents a new approach to overcome this deficiency by treating waste rubbers with silane coupling agent (SCA) and carboxylated styrene-butadiene rubber (CSBR) latex to develop chemical bonds between rubbers and cement paste. This study investigates the influence of this surface treatment on the mechanical strength and chloride penetration resistance of rubberized concrete. Experiments were conducted with six different volume fractions of rubbers (between 0% and 30%) to replace fine aggregate in the concrete. The experimental results showed that the compressive strength and flexural strength of concretes incorporating proper amount of treated rubbers could be improved by 4% and 13% respectively as compared to the control concrete with no rubbers. Moreover, the chloride penetration resistance was also improved by 35%. The good adhesion of waste rubbers to cement paste, the formation of rubber networks and the embedding effect of rubbers as shown in SEM images are explanations for the enhancement in the mechanical strength and durability for the treated rubber concrete. © 2015 Elsevier Ltd.


Li G.,Shantou University | Li G.,Hong Kong University of Science and Technology | Li G.,Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes | Wang L.,Shantou University | And 10 more authors.
RSC Advances | Year: 2015

The piezoresistivity of carbon black/cement mortar (CB/PC) makes it a potential candidate for the development of smart structures with sensing capability. To ensure reliable sensing results in different environments, a hydrophobic styrene-butadiene rubber (SBR) was incorporated to reduce the effect of moisture on the piezoresistivity. The influence of SBR content (0, 5, 10 and 15 wt%) on the electric conductivity and piezoresistivity of SBR/CB/PC mortar with different moisture content was experimentally studied. Results indicate that the electric conductivity and piezoresistivity effect of SBR/CB/PC mortars increase with increasing SBR content. Also, compared to pure CB/PC mortars, the electrical properties of SBR/CB/PC mortars were significantly less sensitive to the variation of moisture. Under cyclic loading, both positive (PP) and negative piezoresistivity (NP) are found to occur in SBR/CB/PC mortars. This behavior can be explained in terms of a mechanism with both the tunneling effect and capacitance effect between CB particles during compression. © The Royal Society of Chemistry 2015.


Wang X.,Chongqing Jiaotong University | Wang X.,Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes | Wu L.,East China Jiaotong University | Zhou Y.,Chongqing Jiaotong University | Wang Y.,Wenzhou University
Shock and Vibration | Year: 2015

The Beijing-Shanghai high-speed railway is one of the milestones of China's high-speed railway development and its security plays a significant role in China's economic and social development. However, the evaluation methods used for large-scale security operations and important infrastructure systems, such as the high-speed railways, are discrete and nonlinear; thus they cannot issue emergency warnings in a timely manner. The emergence of optical fiber sensing technology can solve this problem. This technology has progressed rapidly in its application to the monitoring of railway security and it has attracted much attention within the industry. This study considers the newly built passenger railway line between Shijiazhuang and Jinan as an example. The web-based, all-in-one fiber Bragg grating static level is described as well as a set of online monitoring systems, which is automated, real-time, remote, visual, and adaptable to the standards of the Beijing-Shanghai high-speed railway. According to our theoretical analysis, the planned automated monitoring of settlement deformation for the Beijing-Shanghai high-speed railway and the real-time analysis and calculation of monitoring data can ensure the operational security of this section of China's high-speed railway system. Copyright © 2015 Xu Wang et al.


Yu X.-F.,South China University of Technology | Yu X.-F.,Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes | Gu M.,Tongji University | Xie Z.-N.,South China University of Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

Internal and external pressures on a flat roof structure were tested in a uniform wind field by applying the synchronous pressure measurement technique. To obtain the accurate Helmholtz resonance frequency, the scaling requirement of internal pressure was strictly ensured. The flat roof structure was designed as a typical plate type truss structure, and the effects of opening area, background porosity, wind direction and damping ratio on the vertical displacement of roof were analyzed. The results show that the root-mean-square value of vertical displacement increases with the increase of opening area and with the decrease of background porosity. The damping ratio has nothing to do with the roof displacement response. The vertical displacement in the case of windward opening is significantly larger than in the case of other wind direction opening. The contribution of fluctuating internal pressure on roof displacement response is mainly attributed to its background component. ©, 2015, Chinese Vibration Engineering Society. All right reserved.

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