Modeling of Steel Bolted T-Stub Connection under Large Deformation Condition

2014 ◽  
Vol 1049-1050 ◽  
pp. 479-482
Author(s):  
Jin Fan Zhang ◽  
Zhen Yu Wang ◽  
Jian Qun Jiang
Keyword(s):  
Large Deformation ◽  
Deformation Behaviour ◽  
Model Fit ◽  
Component Model ◽  
Deformation Condition ◽  
Finite Element Models ◽  
Design Codes ◽  
Spring Model ◽  
Proposed Model ◽  
Set Up

Based on the component method of EuroCode3, a new component model to evaluate properties of T-stub connections under large deformation condition has been proposed in this paper. Firstly, the T-stub connection was breakdown into several components. And then those components was equivalent to bilinear springs. Finally the multi-spring model of T-stub connection was set up to describe its load deformation behaviour. With the purpose of verifying and calibrating the proposed model, a series of case studies were carried out and corresponding finite element models has also been set up. Results of FEM and multi-spring model fit well each other. And the applicability of the proposed model can be testified by the parametric study. The method of this paper can describe the behaviour of T-stub connections under large deformation condition, which can be a useful improvement to conventional design codes.

Component Modeling of Steel Bolted End-Plate Joints under Bending and Shearing Loads

2012 ◽  
Vol 226-228 ◽  
pp. 1194-1198 ◽  
Author(s):  
Jin Fan Zhang ◽  
Zhen Yu Wang ◽  
Jian Qun Jiang
Keyword(s):  
Element Model ◽  
Model Fit ◽  
Component Model ◽  
End Plate ◽  
Proposed Model ◽  
Column Joint ◽  
Bending Loads ◽  
Extended End Plate ◽  
Set Up ◽  
Rotational Property

Based on the component method of EuroCode3, a new component model to evaluate rotational properties of extended end-plate beam-to-column joints under shearing and bending loads has been proposed in this paper. Firstly, the T-stub model was set up. And then the end-plate beam-to-column joint was simplified with a set of T-stubs. Finally the end-plate beam-to-column joint was simulated by the proposed component model consists of a series of levers and equivalent springs. With the purpose of verifying and calibrating the proposed model, an experiment of extended end-plate joint is recommended and a corresponding finite element model has also been set up. Results of experiment, FEM and component model fit well each other. The method of this paper can describe the rotational property of end-plate joint under beading moment and shear with enough precision, which can be a useful improvement to conventional design codes.

scholarly journals Prediction of Pest Insect Appearance Using Sensors and Machine Learning

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4846
Author(s):  
Dušan Marković ◽  
Dejan Vujičić ◽  
Snežana Tanasković ◽  
Borislav Đorđević ◽  
Siniša Ranđić ◽  
...  
Keyword(s):  
Machine Learning ◽  
Relative Humidity ◽  
Weather Conditions ◽  
Daily Basis ◽  
Machine Learning Algorithms ◽  
Lower Percentage ◽  
Timely Manner ◽  
Proposed Model ◽  
Set Up ◽  
Accuracy Of Prediction

The appearance of pest insects can lead to a loss in yield if farmers do not respond in a timely manner to suppress their spread. Occurrences and numbers of insects can be monitored through insect traps, which include their permanent touring and checking of their condition. Another more efficient way is to set up sensor devices with a camera at the traps that will photograph the traps and forward the images to the Internet, where the pest insect’s appearance will be predicted by image analysis. Weather conditions, temperature and relative humidity are the parameters that affect the appearance of some pests, such as Helicoverpa armigera. This paper presents a model of machine learning that can predict the appearance of insects during a season on a daily basis, taking into account the air temperature and relative humidity. Several machine learning algorithms for classification were applied and their accuracy for the prediction of insect occurrence was presented (up to 76.5%). Since the data used for testing were given in chronological order according to the days when the measurement was performed, the existing model was expanded to take into account the periods of three and five days. The extended method showed better accuracy of prediction and a lower percentage of false detections. In the case of a period of five days, the accuracy of the affected detections was 86.3%, while the percentage of false detections was 11%. The proposed model of machine learning can help farmers to detect the occurrence of pests and save the time and resources needed to check the fields.

A Study on the Lower Flanges Fracture of Endplate Bolted Connection

2006 ◽  
Vol 326-328 ◽  
pp. 983-986
Author(s):  
Hong Wei Ma ◽  
Chong Du Cho ◽  
Qiang Pan ◽  
Hyeon Gyu Beom
Keyword(s):  
Crack Length ◽  
High Stress ◽  
Transverse Load ◽  
Stress Fields ◽  
Finite Element Models ◽  
J Integral ◽  
Bolted Connection ◽  
Static Tests ◽  
Opening Mode ◽  
Set Up

The quasi-static tests on the endplate bolted connections of the new structure system consisting of SCC beam and CCSHRC column are briefly introduced in this paper. Meanwhile, the 3-D solid finite element models of the connections with pre-existing cracks in the lower flange’s high stress fields are set up by ANSYS. The material nonlinearities of concrete, steel and bars, together with the contact between the endplate and column surface are all considered in the model. With the transverse load applied on top of columns, the fracture parameters are calculated by APDL. The results indicate that the opening mode crack will happen mainly. When the pre-existing crack length is 2.50mm and the inter-storey drift is less than 6mm, the stress intensity factor values agree well with the converting values derived from J-integral and the crack tip fields are in elastic state. The J values are highly influenced by the pre-existing crack length, while seldom influenced by the concrete compression strength. Moreover, the J-integral have the trend to sharply increase when the pre-existing crack length is larger than 0.61mm, and the pre-existing crack will grow during loading when its length is larger than 1.35mm.

Feeder Bus Timetable Design and Vehicle Size Setting in Peak Hour Demand Conditions

2019 ◽  
Vol 2673 (10) ◽  
pp. 321-332 ◽  
Author(s):  
Xueping Dou ◽  
Qiang Meng
Keyword(s):  
Mixed Integer ◽  
Arrival Times ◽  
Non Linear Programming ◽  
Bee Colony ◽  
Proposed Model ◽  
Feeder Bus ◽  
Minlp Model ◽  
Failure Cost ◽  
Set Up ◽  
The Given

This study proposes a solution to the feeder bus timetabling problem, in which the terminal departure times and vehicle sizes are simultaneously determined based on the given transfer passengers and their arrival times at a bus terminal. The problem is formulated as a mixed integer non-linear programming (MINLP) model with the objective of minimizing the transfer waiting time of served passengers, the transfer failure cost of non-served passengers, and the operating costs of bus companies. In addition to train passengers who plan to transfer to buses, local passengers who intend to board buses are considered and treated as passengers from virtual trains in the proposed model. Passenger attitudes and behaviors toward the waiting queue caused by bus capacity constraints in peak hour demand conditions are explicitly embedded in the MINLP model. A hybrid artificial bee colony (ABC) algorithm is developed to solve the MINLP model. Various experiments are set up to account for the performance of the proposed model and solution algorithm.

Transient Calculation of Electric Power Circuits with Special Reference to Magnetizing Nonlinearity

2016 ◽  
Vol 25 (06) ◽  
pp. 1650054
Author(s):  
Xiaoqin Zhang
Keyword(s):  
Electric Power ◽  
Nonlinear Differential Equations ◽  
Linear Part ◽  
Realistic Model ◽  
Power Circuit ◽  
Runge Kutta Method ◽  
Proposed Model ◽  
Power Circuits ◽  
Set Up ◽  
Reduced Scale

This paper proposes a realistic model of magnetizing branches for transient calculation of electric power circuits. The model represents the nonlinear relationship between flux linkage and exciting current of magnetizing branches with a major loop and a family of minor loop trajectories, which has the capability of simulating the multi-valued hysteresis behavior. By applying the proposed model to transient calculation, an efficient algorithm is developed for obtaining the transient responses in electric power circuits. In the algorithm, the electric power circuit is divided into the magnetizing branches and the remaining linear part. The nonlinear differential equations are set up for the magnetizing branches and solved by the semi-explicit Runge–Kutta method. The transient calculation for the remaining linear part is performed on the basis of the solution to the magnetizing branches. Then, a laboratory measurement is made with a reduced-scale experimental arrangement. The measured results are compared with the calculated ones and a reasonable agreement is shown between them.

The Influence of Travel Experience on Mature Travelers’ Quality of Life

2011 ◽  
Vol 3 (1) ◽  
pp. 52-64 ◽  
Author(s):  
Yawei Wang ◽  
Francis A. McGuire ◽  
Bin Zhou
Keyword(s):  
Quality Of Life ◽  
Life Satisfaction ◽  
Theoretical Model ◽  
Path Analysis ◽  
Model Fit ◽  
Southern State ◽  
Global Life Satisfaction ◽  
Travel Experience ◽  
Proposed Model

The purpose of this study was to examine the influence of past travel experience (i.e., number of trips and number of days away from home in last year), and on mature travelers’ quality of life (i.e., self-perceived health and global life satisfaction). A total number of 217 respondents (50+) in a southern state were used in this study. Path analysis (PROC CALIS in SAS) was performed to test the proposed model. An estimation of the proposed theoretical model revealed that the model fit the data. However, the model should be further examined and applied with caution.

Modelling and Simulation of the Coupling of Normal Pressure and Shear Force in Plain Woven Fabrics

2014 ◽  
Vol 611-612 ◽  
pp. 363-367 ◽  
Author(s):  
Oliver Döbrich ◽  
Thomas Gereke ◽  
Chokri Cherif
Keyword(s):  
Process Design ◽  
Deformation Behaviour ◽  
Computation Time ◽  
Normal Pressure ◽  
Woven Fabrics ◽  
Deformation Analysis ◽  
Finite Element Models ◽  
Large Deformation Analysis ◽  
Mechanical Models ◽  
Textile Forming

In textile engineering, simulative methods are used more frequently due to their advantages in material and process design. Finite element models were developed for simulating the mechanical and the draping behaviour of fabrics. For large deformation analysis of textile forming, macro mechanical models are employed that use continuum mechanical approaches for matters of reduced computation time. The material data that is required as model input, such as tension and shear properties, can either be obtained by experimental or virtual tests. In such virtual tests the deformation behaviour of fabrics can be determined by deforming the structure on the meso level.

Modeling of the Axial and Tilt Stiffness Between a Magnet Track and a Ferromagnetic Backing

2007 ◽  
Author(s):  
Jay Krishnasamy ◽  
Jairo Moura
Keyword(s):  
Finite Element ◽  
Stress Tensor ◽  
Magnetic Bearings ◽  
Magnetic Interactions ◽  
Finite Element Models ◽  
Maxwell Stress ◽  
Modeling And Analysis ◽  
Maxwell Stress Tensor ◽  
Proposed Model ◽  
Radial Forces

This paper consists of modeling and analysis of the axial and radial forces as well as axial and tilt stiffness between a magnetic track and a ferromagnetic backing. The proposed model utilizes the concept of Maxwell stress tensor and simplified reluctance models in order to predict the magnetic interactions between the rotor and the stator. In other to verify the model developed, finite element models and experiments are performed for the case of a linear magnetic track. The results can be applied to the case of rotary tracks without loss of generality. Applications of this work can be used in the design of magnetic bearings or servo motors with ferromagnetic stators.

Nonlinear Large Deformation of Graphene Sheets Using a Nonlocal-Based ANCF Method

2019 ◽  
Vol 11 (04) ◽  
pp. 1950037 ◽  
Author(s):  
Qingtao Wang ◽  
Zhen Zhao ◽  
Yang Zhang ◽  
Zhaojun Pang ◽  
Fuzhou Niu
Keyword(s):  
Large Deformation ◽  
Nonlocal Elasticity Theory ◽  
Nonlocal Theory ◽  
Elastic Force ◽  
Graphene Sheets ◽  
Deformation Problem ◽  
Proposed Model ◽  
Large Deformation Problem ◽  
Loading Modes ◽  
Definition Of

A novel nonlinear model of single-layered graphene sheets (SLGSs) subject to large deformation is proposed using the absolute nodal coordinate formulation (ANCF) and the nonlocal elasticity theory. The geometrical definition of SLGSs is described by ANCF thin plate element while the strain energy is expressed by nonlocal theory. Then, the formulation of elastic force and the Jacobian of the elastic force is derived. We verify the proposed model by comparing the results with other published results and conduct corresponding numerical case study to clarify the influence of boundary conditions (BCs), nonlocal parameters, side length and aspect ratio. Large deformation problem of SLGSs with several BCs and different loading modes are simulated to study the mechanical nonlinearity of the SLGSs.

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