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Vibration characteristics of frozen soil under moving track loads

Research in Cold and Arid Regions 2015年第4期7卷 414-420页

作者： AiPing Tang AnPing Zhao AiHua Wen Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education School of Civil Engineering Heilongjiang University China Academy of Architecture and Building School of Science Harbin Institute of Technology

Vibration due to moving traffic loads is an important factor which induces frozen soil damage; this paper analyzed these vibration characteristics of frozen soil foundation under track loads. Firstly, seismic observation array （SOA） technology was applied to monitor the three dimensional dynamic characteristics of frozen soil under movable track load in a per- mafrost region and seasonal frozen soil area. Secondly, a numerical simulation for the response of frozen soil under movable track load was performed based on finite element analysis （FEA）, The results show that dynamic characteristics of frozen soil in perpendicular and parallel direction of the track are obviously different. In the direction perpendicular to the track, the vertical acceleration amplitude had an abrupt increase in the 9-10 m from the track line. In the direction parallel to the track, the acceleration in vertical and horizontal direction had a quick attenuation compared to the other direction. Lastly, various parameters were analyzed for the purpose of controlling the dynamic response of frozen soil and the vibration attenuation in frozen soil layer.

关键词： moving track load dynamic response seismic observation array （SOA） permafrost seasonal frozen soil

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Static and fatigue performances of clip anchorage system for FRP rod used in cable

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Engineering structures 2025年 339卷

作者： Guijun Xian Yanzhao Niu Jingwei Tian Chenggao Li Qingrui Yue Rui Guo Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education Harbin Heilongjiang 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin Heilongjiang 150090 China Research Institute of Urbanization and Urban Safety School of Civil and Resource Engineering University of Science and Technology Beijing Beijing China

To obtain the static and fatigue performances and provide the design parameters of FRP rod for the application in cable structures, the design and preparation method of steel clip anchor, steel clip anchor with aluminum sleeve and adhesive layer are presented in the present paper. The effect of taper difference, preload and anchor type on static and fatigue performances is studied by tensile and fatigue test, and the optimal design and application parameters of anchor are obtained. The results show that the peak shear stress of the rod at the front end of anchor can be reduced effectively by setting 0.1 ° taper difference, and the bearing capacity is increased by 40.7 %, 12.1 % and 5.3 % compared with 0 ° and 0.2 ° taper difference for steel clip anchor, steel clip anchor with aluminum sleeve and adhesive layer. The slippage of anchor can be reduced effectively with the increase of preload, which improves the critical slippage load of anchor. In addition, the stress concentration of rod inside the anchor can be reduced with the addition of low modulus adhesive layer between steel clip and rod, which reduces the sensitivity of tensile performances to taper difference and delays the fatigue damage accumulation process of rod inside the anchor, the anchoring efficiency and fatigue resistance increases by 10.9 % and 61.4 % compared with steel clip anchor, respectively.

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Prediction of uneven distribution of snow load based on generalized regression neural network 10

Prediction of uneven distribution of snow load based on gene...

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10th International Structural Engineering and Construction Conference, ISEC 2019

作者： Ren, Zhicheng Zhang, Qingwen Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China

ISBN: (纸本)9780996043762

At present, there are mainly three research ways on the distribution of snow load: field measurement, experimental simulation, and numerical simulation. They all need expensive equipment, specimen model used only once, and slight defective simulation software. Artificial Neural Networks (ANNs) rely on a large number of input functions to estimate unknown or known occurrences. This paper applies ANNs to predict the uneven distribution of snow loads. First, the snow load database is collected and set up, including all the data from field measurement and experimental simulation. Second, part of the data from the 1m3 model is used as a training set to train Backpropagation Neural Networks (BPNN) and Generalized Regression Neural Networks (GRNN). The parameters of the two neural networks are determined (such as the smoothing factor in the GRNN), and the rest of the data is used to examine the model;the prediction and measurement results of the two models are compared. Finally, based on different wind direction angles and wind speed, a GRNN model is established to predict the uneven snow load distribution. Through comparative analysis, GRNN is more suitable for predicting the uneven distribution of snow loads, especially in predicting snow thickness. In particular, the prediction effect of the model on the snow load distribution trend is good, and the prediction ability of the neural network model is displayed. Copyright © 2019 ISEC Press.

关键词： Neural network models

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Crack pattern prediction of laterally loaded panels with openings based on ANN method 10

Crack pattern prediction of laterally loaded panels with ope...

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10th International Structural Engineering and Construction Conference, ISEC 2019

作者： Wang, Yongfei Zhang, Yu Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China

ISBN: (纸本)9780996043762

In this paper, a Back Propagation Neural Network (BPNN) is used to predict crack pattern for masonry panels with opening subjected to lateral loading. The cellular automata method is used to digitalize the panels, including two steps - dividing a panel into a certain number of cells and calculating cell state values by use of a Von Neumann neighborhood model. These digitalized values are used as input data of NN model, respectively. All the experimental data is collected, including panel configuration, material property, opening ratio and location, state values, and crack pattern. The NN model is trained repeatedly, taking part of the data as a training set, to determine parameters, and the rest of the data is taken to check the model. Well-trained NN models can predict the crack pattern of any other panel. The results show that NN method is suitable for prediction of crack pattern. Comparing the two ways of prediction, the Fragility Coefficient Method gets a more precise pattern. The predicted cracks are distributed successively in some specific areas, especially in high similarity, compared with experimental crack pattern. Copyright © 2019 ISEC Press.

关键词： Forecasting

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Fire resistance design of circular steel tube confined reinforced concrete columns 9

Fire resistance design of circular steel tube confined reinf...

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9th International Conference on Advances in Steel structures, ICASS 2018

作者： Yang, Hua Liu, Faqi Wang, Yuyin Zhang, Sumei Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China

ISBN: (纸本)9889914093

No study has been reported on fire performance of steel tube confined reinforced concrete (STCRC) columns. Hence fire behaviour of circular STCRC columns is investigated in this paper. Fire tests and numerical studies of circular STCRC columns are briefly introduced. Five full-scale specimens, including four circular STCRC columns and one CFST column, were tested to failure under combined thermal and mechanical loading. Temperatures across the section, displacement versus time curves and fire resistance of these columns were monitored and recorded. A finite element (FE) model was developed using the program ABAQUS, and validated against the test results. Based on test and FE results, a simplified design method was proposed for predicting fire resistance of circular STCRC columns exposed to ISO 834 standard fire condition. It was found that load ratio has significant influence on the fire resistance of circular STCRC columns. Compared with CFST columns and reinforced concrete columns, circular STCRC columns have higher fire resistance than the former and lower fire resistance than the latter. Copyright © 2018 by The Hong Kong Institute of Steel Construction.

关键词： Fire resistance

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Flexural behaviour of precast, prestressed ribbed RPC bottom panels

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Open Civil Engineering Journal 2015年第1期9卷 535-543页

作者： Wenzhong, Zheng Xueyuan, Lu Ying, Wang Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology Harbin150090 China

This study introduces a new type of precast, prestressed reactive powder concrete (RPC) bottom panel for a large-span composite slab. The bottom panels, which have one or two inverted ribs with openings, act as formwork during the construction stage. The paper experimentally investigated the crack characteristics, deflection, and normal section bearing capacity of four precast, prestressed ribbed RPC bottom panels under flexural load. The results indicated that the RPC ultimate strain under non-uniform compression is 5500×10-6and the plastic influence coefficient of the section modulus is linear with the longitudinal reinforcement ratio. The tensile stress of RPC at the cracked section should be considered while calculating the flexural stiffness;the equation used to determine the nominal tensile stress of RPC as a major variable for calculating the crack width at the bottom of panels was proposed. The bottom panels generally exhibit an over-reinforced failure mode behaviour without the composite layer;the calculation method of the normal section bearing capacity of this mode was established. © Wenzhong et al.

关键词： Bearing capacity

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Lattice Modelling of Chloride Diffusivity of Hardened Cement Paste

Lattice Modelling of Chloride Diffusivity of Hardened Cement...

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The 14th International Congress on the Chemistry of Cement（ICCC 2015）

作者： Hongzhi Zhang Xinchun Guan Jinping Ou Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology

Based on numerical micro-structure model of cement paste,a lattice diffusion model is generated to study the influence of randomness on the chloride diffusion coefficient of capillary pore *** results indicate that,compared with regular model,random model has longer diffusion distance,consequently,in order to get same simulation diffusion results,the former's diffusion coefficient should be adjusted a lttlte *** Lattice models have been used in fracture mechanics of cement-based materials for a long ***,the use of lattice models has been extended on simulating chloride transport processes in this *** of the transport models focus on simulation method and process,but the difference of simulated results caused by randomness is generally *** this paper,a lattice diffusion model is generated to study the influence of randomness on the chloride diffusion coefficient of capillary pore element,the reason that different simulation method has different results is also found.

关键词： durability micro-scale lattice model chloride diffusion

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Numerical Analysis on the Effect of Vital Design Parameters on the Seismic Performance of Shear Walls with Horizontal Ring Connection 7

Numerical Analysis on the Effect of Vital Design Parameters ...

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7th International Conference on Environmental Science and Civil Engineering, ESCE 2021

作者： Zhou, Jian Zhang, Tao Li, Liming Guo, Zhipeng Shi, Qiancheng China Construction Science and Technology Group Co. Ltd. Beijing100195 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

Prefabricated shear walls are currently widely applied in mid-to-high-rise structures. As a new type of structural form of assembled shear walls, the ring connection assembled concrete shear wall has clear mechanical mechanism, easy construction and better performance and other significant advantages, which are gradually being applied in actual engineering. However, few systematic studies are carried on this new type of shear wall structure, and a complete theoretical system for guiding the design could not be given, especially in terms of mechanical mechanism and seismic performance, more detailed research work is needed. This paper uses numerical simulation as the main method to study the influence of different design variables such as shear span ratio, buckle size, axial compression ratio on the mechanical properties of the connection area in shear wall and the overall seismic performance of the structure. In this way, the theoretical basis for further optimizing the structural performance of the shear wall connection with ring connection. © Published under licence by IOP Publishing Ltd.

关键词： Shear walls

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Analyzing Risks in Public-Private-Partnership Projects: An Integrated Model of Sensitive Analysis and Monte Carlo Simulation

Analyzing Risks in Public-Private-Partnership Projects: An I...

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2018 International Conference on Construction and Real Estate Management: Construction Enterprises and Project Management, ICCREM 2018

作者： Feng, Chong Wang, Yaowu Dept. of Construction Management Harbin Institute of Technology Harbin150001 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology China

ISBN: (数字)9780784481752

ISBN: (纸本)9780784481752

Compared with traditional financing mode of construction, public-private-partnership (PPP) mode has the great opportunity that private enterprises develop rapidly and solved the shortcomings that the amount of infrastructure investment is large and governments lack funds. Thus PPP mode is being adapted extensively. The keys to successfully implement PPP mode are effectively identifying and analyzing risks in PPP projects, in order to achieve the risk management of PPP projects. The research is aimed to establish a risk analysis model of PPP projects combining the sensitive analysis and Monte Carlo simulation. Then it uses a real case "Shijiazhuang International Exhibition Center" to verify this model and proposes strategies to deal with the main risks. The result of this case study proved effectiveness of the proposed model, which can be used in further risk analysis of PPP projects. © 2018 American Society of Civil Engineers.

关键词： Risk analysis

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Axial compression performances of concrete filled flax-basalt hybrid fibers reinforced FRP tubes 12

Axial compression performances of concrete filled flax-basal...

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Joint Conference of the 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete structures, FRPRCS 2015 and the 5th Asia-Pacific Conference on Fiber Reinforced Polymers in structures, APFIS 2015

作者： Xia, Yuanyuan Xian, Guijun Li, Hui Key Lab. of Structural Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

Flax fiber reinforced polymer (FFRP) composites could be used in civil engineering as structural materials. To improve the mechanical properties and durability of FFRP, flax-basalt hybrid fiber reinforced polymer (HFRP) composite was developed. In the present study, unidirectional HFRP tubes were prepared with a winding process, and the compression performances of the concrete filled HFRP tubes were investigated. HFRP coupon was prepared and tested in tensile properties. The tensile results of the HFRP plate coupons shows linear in stress-strain, and hybrid with basalt fiber enhances the elongation at break remarkably. The tensile strength and modulus of the HFRP follow the rule of mixture. The concrete filled HFRP tubes exhibited much improved ultimate strength and ductility compared to those with the flax fiber tubes. The axial compression stress-strain curves were analyzed with the existing models. The coefficients of confinement of HFRP were higher than those of glass or carbon fiber based FRPs. © APFIS 2015. All rights reserved.

关键词： Fiber reinforced plastics

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