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Distributed real-time in-situ monitoring method for deformation measurement of landslide 8

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Distributed real-time in-situ monitoring method for deformat...

8th Symposium on Novel Photoelectronic Detection Technology and Applications

作者： Liu, Weikang Zhou, Wensong Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Landslide disasters often cause huge property losses and casualties. Therefore, distributed real-time landslide deformation monitoring is of great significance to ensure the safety of people's lives and property, and the stability evaluation of landslide. Ultra-weak fiber Bragg grating (UWFBG) sensing technology can realize the measurement distance of 20 km for single optical fiber, and the single measurement time is less than 1 s. Therefore, it has the potential of distributed real-time monitoring. In this work, a novel distributed real-time landslide deformation monitoring method based on UWFBG was proposed. And this method was applied to a real landslide in Yibin City, Sichuan Province, China, to monitor its deformation in situ. The feasibility of the monitoring method was verified and the landslide deformation was analyzed. The in-situ monitoring results show that on the time scale, the local deformation of the landslide is gradually increasing;on the spatial scale, there are some points with large local deformation, but the overall deformation in the monitoring area is small. The monitored results also suggest that the landslide is in a stable state during the monitoring period. © 2022 SPIE

关键词： Landslides

Mechanical and Thermal Properties of Environmentally Friendly Straw Boards

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SSRN 2023年

作者： Zheng, Chaorong Sun, Kuo Chen, Yixiao Zhang, Wenyuan Wu, Yue School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

Straw is an environmentally friendly, cost-effective, and abundant raw material for building boards. To assess the feasibility of using straw boards as alternative sheathing panels in light-steel-members such as walls and floors, the mechanical and thermal properties of straw boards with high densities were investigated. The straw boards involved in this study include five wheat straw strand boards (WSSB12, WSSB15, WSSB18, WSSB25, and WSSB30) and a paper straw board (PSB58). Mechanical properties, including compression, tension, and bending properties, were investigated by tests and a proposed prediction method of tensile strength. In the experimental studies of compression properties, the failure modes and characteristics of load-deformation curves of compressive specimens, and the parameters of compression properties, including the strength, elastic modulus, and Poisson ratio, were analyzed and summarized, and the differences in material directivity were discussed as well. The WSSBs were found to be transverse isotropic material with brittle characteristics in the plane, while the PSB showed similar brittle characteristics in the failure stage. Furthermore, the experimental studies of bending properties and similar analyses and summaries for test results were carried out. Results show that the bending strength is less than the compressive strength for WSSBs, while the case is just the opposite for PSB, and the elastic moduli of bending and compression are close for both WSSBs and PSB. Then, finite element models (FEMs) of the bending test specimens using the user material subroutine UMAT were developed to predict the tensile strength ft, and the prediction results were qualitatively assessed based on the correlation between ft and fb, fc. As verified, the prediction results of ft are believable, and the prediction method proposed in this study is feasible. Such a prediction method could efficiently determine the tensile strength of similar brittle materials withou

关键词： Tensile strength

Research on Local Heating Technology in Extremely Low Temperature Environment Based on Thermal Comfort and CFD 18

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Research on Local Heating Technology in Extremely Low Temper...

18th IBPSA Conference on Building Simulation, BS 2023

作者： Wang, Zhen Zhang, Yuanyuan Gao, Hu Xia, Yun Wu, Yue Liu, Jing School of Architecture Harbin Institute of Technology Heilongjiang Harbin150006 China Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information Technology China Heilongjiang Province Academy of Cold Area Building Research Heilongjiang Harbin150080 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

This paper investigated the effect of personal heating technology on human thermal comfort and skin temperature in extremely low temperature environment. Four subjects carried out personal heating experiments in a low temperature laboratory at around -21°C. Personal heating equipment includes heating glove, heating cushion, heating mat and airwarmer. In order to maximize the thermal comfort of personnel, this paper designed an efficient local heating system based on airwarmer and heating mat. At the same time, in order to better evaluate the thermal comfort of personnel in an extremely low temperature environment, an improved one-dimensional stolwijk human thermoregulation model(HTM) was established. By combining it with CFD, the influence of the airwarmer on the thermal comfort of personnel and skin temperature was simulated. This method can be used to assess the overall thermal sensation and thermal comfort of personnel in extremely low temperature environment. © 2023 *** rights reserved.

关键词： Thermal comfort

Thermal performance of a novel Trombe wall enhanced by a solar energy focusing approach

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Low-carbon Materials and Green Construction 2024年第1期2卷 379-394页

作者： Xianzhang Dong Huigang Xiao Minglei Ma School of Civil Engineering Harbin Institute of TechnologyHarbin 150090PR China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education (Harbin Institute of Technology)Harbin 150090PR China China Construction Eighth Engineering Bureau Co. LtdShanghaiPR China

The Trombe wall is a passive solar building exterior wall system proposed by Professor Felix Trombe in France,which can collect solar energy to heat buildings without additional energy consumption,making it a focal point of research in building energy ***,its effectiveness is constrained by the low density of solar radiation in winter and the potential for overheating in *** study introduces a novel Trombe wall designed to address these issues through a focused strategy,enabling automatic transition between heating during winter and shading during *** thermal performance parameters of the novel Trombe walls in both winter and summer seasons are examined,and their energy consumption is assessed using experimental research *** indicate that the novel Trombe wall facilitates greater energy savings in both winter and *** compared with traditional Trombe walls,the novel Trombe wall achieves a significant reduction in energy consumption,with up to 55 W/m^(2)in heating load during winter and 47 W/m^(2)in cooling load during *** introduction of this new system holds substantial potential for the realization of zero-energy buildings.

关键词： Trombe wall Thermal performance Focusing approach Overheating

Identification of Chloride Diffusion Coefficient in Concrete Using Physics-Informed Neural Networks

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SSRN 2023年

作者： Wan, Yutong Zheng, Wenzhong Wang, Ying Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

The corrosion of steel caused by chloride is one of the important causes of the deterioration of reinforced concrete structures. In order to describe the transport behavior of chlorides in concrete and to make quantitative durability designs based on it, it is necessary to determine the chloride diffusion coefficient correctly. However, the commonly used analytical method is not suitable for the free chloride diffusion coefficient considering the nonlinear chloride binding capacity of concrete. In this study, by comparing the results of solving forward problems involving chloride transport equations using finite element method (FEM) and solving corresponding inverse problems using physics-informed neural networks (PINNs), it is verified that PINNs can be applied to identify the chloride diffusion coefficient in non-steady-state immersion tests and accelerated chloride migration tests considering no chloride binding, Langmuir binding, or Freundlich binding. The robustness of PINNs is verified by training with 5% noise data as observed data. The results of interpolation and extrapolation using PINNs trained successfully show its excellent generalization performance. © 2023, The Authors. All rights reserved.

关键词： Diffusion

Evaluation on the Failure Modes and Progressive Collapse Resistance of Self-Centering Infilled Precast Concrete Frame

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SSRN 2023年

作者： Wang, Haoran Li, Shuang Zhai, Changhai Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

In this study, the refined finite element (FE) models for the collapse resistance of self-centering precast concrete (PC) frames with and without infill walls were established. Based on the validated FE models, the effects of different design parameters on the failure modes at the beam ends as well as the collapse resistance of the structures were carried out. Correspondingly, the reasonable optimization measures were suggested to reduce the concrete damage at the beam ends. The results indicated that the insufficient stirrup spacing may cause the concrete failed prematurely along the edge of the steel jackets due to stress concentration. Decreasing the thickness of steel angles could reduce the failure area of concrete at the beam ends, but also caused a significant reduction in the initial stiffness and vertical resistance of the structures. The thickness of steel jackets mainly influenced the size of failure area at the beam ends. The position of horizontal bolts and longitudinal bolts had effects on the failure modes of concrete at the beam ends as well as the collapse resistance of the structures, while the latter was particularly evident. Compared to the cast-in-place RC frames with the same size and reinforcement ratio, the damage extent at crucial locations of the optimized self-centering PC frame structures was lower, while exhibiting more excellent collapse resistance. A calculation model considering the resistance contribution of structural and non-structural infill wall members was proposed to predict the vertical resistance of self-centering PC frame structures in the compressive arch action (CAA) stage. © 2023, The Authors. All rights reserved.

关键词： Precast concrete

Experimental and Numerical Study on dynamic Responses of a Tlp-Type Modular Floating Structure System

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SSRN 2024年

作者： Li, Yanwei Ren, Nianxin Cai, Wenyu Liu, Yaqiong Ou, Jinping School of Marine Science and Engineering Hainan University Haikou570228 China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou570228 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education China

This paper explores a proposed TLP-type modular floating structure system, incorporating both central TLP modules and peripheral floating artificial reef modules. The outermost floating artificial reef module can function as a floating breakwater, and also serving as a habitat for surrounding marine organisms. Both scale model tests (1:80) and time-domain numerical simulations were performed. The simulations accounted for hydrodynamic interactions among the bodies and the mechanical coupling effects. During the scale model test, a survival strategy has been proposed to prevent collision risks between reef modules and adjacent TLP modules. A preliminary stiffness recommendation was suggested by a trade-off between the pitch of the reef module and the spring force. Numerical and experimental results have been widely compared and discussed. A good agreement has been achieved, although responses are slightly overestimated by numerical simulation due to the neglect of the viscous damping effect. In addition, the responses of the proposed system, connected with and without the outermost floating artificial reef module, have been compared and analyzed. The results suggest that the connection of the reef module can significantly reduce the system's surge response and enhance its survivability under severe sea conditions. © 2024, The Authors. All rights reserved.

关键词： dynamic response

Mussel-Inspired Modified Tannic Acid Additive To Strengthen Interfacial Bonds Of Epoxy Resin With Steel Substrates

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Mussel-Inspired Modified Tannic Acid Additive To Strengthen ...

第八届中国国际粘接技术大会

作者： Noel Babu Guijun Xian Key Lab of Structures Dynamic Behavior and Control Ministry of EducationHarbin Institute of Technology Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology School of Civil Engineering Harbin Institute of Technology

Epoxies are widely used as coatings and adhesives in many structural ***,the loss of interfacial adhesion between the resin and substrate is a concern,especially in moist *** recent years,much attention has been directed toward mimicking the adhesion mechanism utilised by mussels to holdfast themselves onto underwater *** an inexpensive solution that can be quickly adopted for large-scale industrial applications is yet to be *** acid(TA) is a readily available polyphenol from plants with abundant phenolic hydroxyl *** was found that chemical modification of TA was necessary to use its phenolic –OH groups to mimic mussel *** was grafted with hydrophobic chains of allyl glycidyl ether(AGE) in the presence of a base *** 1wt.% additive in the resin(TA-AGE1),a 37% increase in shear strength was obtained with steel *** Boeing wedge test was performed in a harsh environment(water bath at 60 ℃) to confirm the interfacial bond *** is proposed that with the incorporation of the additive,more hydrogen and coordination bonds can be formed at the resin-adherend interface contributing to the strengthening of interfacial bonds.

关键词： Epoxy resin Mussel adhesion Tannic acid Interfacial bond durability

Stability Analysis and Design Methods of Steel Pipe Piles in Extreme Marine Corrosive Environments

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SSRN 2023年

作者： Han, Xinhao Liu, Changyong Hu, Qing Su, Andi Zhang, Sumei Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

Steel pipe piles (SPPs) are commonly applied for marine platform foundations due to high bearing capacity. However, for SPPs in corrosive marine environments, the corrosion on the steel tube is severe and shows a non-uniform distribution along the height direction, resulting in the significant decrease of the stability bearing capacity. To investigate the stability performance of SPPs in marine corrosive environments, the corroded SPPs are simplified into five-segment stepped columns, and the equilibrium differential equations are established to obtain the rotational stiffness relationship. The accurate solutions of the critical buckling loads of five-segment stepped columns under arbitrary boundary conditions are obtained by iterative methods. Besides, considering the material and geometrical nonlinearity, the finite element (FE) model of corroded SPPs is established and then verified based on existing test results. The effects of the number of segments and stiffness ratios among different segments on the bearing capacity are analysed. Furthermore, considering the interactions among different segments, the calculation methods for the stability bearing capacity of stepped columns under axial compression and combined compression-bending are proposed respectively. The comparison between calculated and FE results indicates that the proposed calculation methods have good prediction accuracy and can be available for practical engineering reference. © 2023, The Authors. All rights reserved.

关键词： Bearing capacity