Stress Analysis of Cement Concrete Pavement under Overweight Loads

2012 ◽  
Vol 446-449 ◽  
pp. 949-953
Author(s):  
Ya Ni Lu ◽  
Tao Li Xiao
Keyword(s):  
Finite Element ◽  
Regression Analysis ◽  
Finite Element Model ◽  
Element Model ◽  
Concrete Pavement ◽  
The Other ◽  
Tension Stress ◽  
Statistical Regression ◽  
Cement Concrete ◽  
Cement Concrete Pavement

Special load has produced serious damage to the concrete pavement because of the great gross weight and heavy axle load, but the present specification has not mentioned this kind of load. On this occasion, Several conditions of critical load are identified through ANSYS finite element model analysis and the formula through statistical regression analysis to the bottom maximum tension stress is drawn up. Which can not only guide the concrete pavement design under the special load but also the result may be referred by the other kinds of engineering.

Asphalt Overlaying Cement Pavement Structure with APP Modified Asphalt Felt Controlling Reflective Crack

2010 ◽  
Vol 168-170 ◽  
pp. 1218-1221
Author(s):  
Xiao Feng Wang ◽  
Yu Qing Yuan
Keyword(s):  
Tensile Modulus ◽  
Element Model ◽  
Core Sample ◽  
Concrete Pavement ◽  
The Other ◽  
Cement Concrete ◽  
Atactic Polypropylene ◽  
Modified Asphalt ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement

In order to explore the mechanism and effect of atactic polypropylene (APP) modified asphalt felt preventing crack, which is used as interlayer between old cement concrete pavement and asphalt overlay, by dint of establishing finite element model, considering tensile modulus of the material, the authors calculated and analyzed the load, temperature and coupling stresses on the key dangerous points. Then, laboratory test of direct-shearing and pullout were carried out. It is indicated that the interlayer stress conditions change with tensile modulus of felt, with a perfect synthetically stress-reduced effect when the modulus reaching 1000MPa; the shearing- destruction displacement of core sample with felt interlayer comes to 7.5mm, 3.0mm more than that without the specific interlayer; the pullout-destruction force of core sample with felt interlayer arrives at 10000N, 6000N more than the other. The results show that APP modified asphalt felt is a kind of better preventing-crack materials between old cement concrete pavement and asphalt overlay, which can efficiently cut down the interlayer stresses and improve its working state.

Influence of the Dispensation of Transfer Bar to the Load Coefficient at Concrete Pavement Seam

2013 ◽  
Vol 392 ◽  
pp. 895-899
Author(s):  
Fang Ran Zhao ◽  
Ye Ming Li
Keyword(s):  
Finite Element ◽  
Load Transfer ◽  
Three Dimensional ◽  
Element Model ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
Cement Concrete Pavement ◽  
Dimensional Finite Element ◽  
Joint Width ◽  
Three Dimensional Finite Element

The airport cement concrete pavement seam is very important to the bearing capacity and Flatness. Considering the importance of seams, a detailed three-dimensional finite element model was used to investigate the state of seams. According the calculation method of load transfer coefficient, the coefficient was obtained. Comparing the different coefficient, the best position of dowel steels, the best diameter of dowel steels, the best buried depth of dowel steels and the best joint width of dowel steels all can be gained best joint width of dowel steels all can be gained.

Study on Load Stress of Lean Concrete Base in Asphalt Pavement

2012 ◽  
Vol 178-181 ◽  
pp. 1495-1498
Author(s):  
Li Jun Suo
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Asphalt Pavement ◽  
Element Model ◽  
Pavement Design ◽  
The Other ◽  
Three Dimension ◽  
Traffic Loading ◽  
Concrete Base

Load stress, which is caused by traffic loading, is important parameter used in the analysis of the new pavement design. In order to study the load stress of lean concrete base in the asphalt pavement, first of all, three–dimension finite element model of the asphalt pavement is established. The main objectives of the paper are investigated. One is calculation for load stress of lean concrete base, and the other is analysis for relationship between load stress of lean concrete base and parameters, such as thickness, modulus. The results show that load stress of lean concrete base decreases, decreases and increases with increase of base’s thickness, surface’s thickness and ratio of base’s modulus to foundation’s modulus respectively. So far as the traffic axle loading is concerned, it has a significant impact on load stress of lean concrete base, and it can be seen from results that when load is taken from 100kN to 220kN, load stress increases quickly with the increase of the traffic axle loading.

scholarly journals Investigation of Beam Column Joint with Beam Weak in Shear under Monotonic Loading

2018 ◽  
Vol 7 (2.20) ◽  
pp. 182
Author(s):  
B Mounika ◽  
P Poluraju
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Main Parameter ◽  
Analytical Study ◽  
Experimental Studies ◽  
Element Model ◽  
The Other ◽  
Shear Reinforcement ◽  
Weak Beam ◽  
Column Joint

Earthquake affected structures, mostly failure occur at beam column joints (BCJ). BCJs are categorized according to their geometrical grouping as Interior, Exterior, and Corner joints. Exterior beam column joint (i.e., terminating the beam on one of the column faces) was the most vulnerable one with respect to the plane of loading. The present study aims at ductility behaviour of exterior BCJ with conventional reinforcement using the code IS 456-2000 and with special confining reinforcement using the Code IS 13920-2016. Four number of beam-column joint specimens are considered in which the first one is detailed as per IS 456-2000, the second one as per IS 13920-2016 and the other two with 50% and 30% reduction of shear reinforcement was provided while compared with the first specimen. It is mainly to satisfy the strong column-weak beam concept as the main parameter. The test was carried out on the loading frame with hinged conditions to the column both ends, and the load is applied at the tip of the beam. The experimental studies are proven with an analytical study carried out by finite element model by using ANSYS and disparate parameters are assessed both experimentally and analytically.  

scholarly journals Seismic Failure Pattern Prediction in a Historical Masonry Minaret under Different Earthquakes

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Halil Nohutcu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Nonlinear Analysis ◽  
Dynamic Characteristics ◽  
Time History ◽  
Element Model ◽  
Ambient Vibration ◽  
Tension Stress ◽  
Historical Structures ◽  
Ambient Vibration Tests

Historical structures are the values that are of great importance to that country, showing the roots of a country, and must be passed on from generation to generation. This study attempts to make a contribution to this goal. Seismic damage pattern estimation in a historical brick masonry minaret under different ground motion levels is investigated by using updated finite element models based on ambient vibration data in this study. Imaret Mosque which was built in 1481 AD is selected for an application. Surveying measurement and material tests were conducted to obtain a 3D solid model and mechanical properties of the components of the minaret. Firstly, the initial 3D finite element model of the minaret was analyzed and numerical dynamic characteristics of the minaret were obtained. Then, ambient vibration tests as well as operational modal analysis were implemented in order to obtain the experimental dynamic characteristics of the minaret. The initial finite element model of the minaret was updated by using the experimental dynamic results. Lastly, linear and nonlinear time-history analyses of the updated finite element model of the minaret were carried out using the acceleration records of two different level earthquakes that occurred in Turkey, in Afyon-Dinar (1995) and Çay-Sultandağı (2002). A concrete damage plasticity model is considered in the nonlinear analyses. The conducted analyses indicate that the compressive and tension stress results of the linear analyses are not as realistic as the nonlinear analysis results. According to the nonlinear analysis, the Çay-Sultandağı earthquake would inflict limited damage on the minaret, whereas the Dinar earthquake would damage some parts of the elements in the transition segment of the minaret.

Resonant Pavement Breaker Vibration System Design and Simulation

2013 ◽  
Vol 850-851 ◽  
pp. 266-269
Author(s):  
Song He Zhu ◽  
Bo Yang ◽  
Xian Xiao Hou ◽  
Guo Sheng Lv ◽  
Ming He
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
System Design ◽  
Virtual Prototype ◽  
Concrete Pavement ◽  
Vibration Characteristics ◽  
System Model ◽  
Vibration System ◽  
Cement Concrete ◽  
Cement Concrete Pavement

This paper is about the vibration system of cement concrete pavement resonant breaker design and simulation. Finished the design and simulation of vibration system model and got the vibration characteristics and its parameters in detail by using virtual prototype technology and finite element method.

Study on Shearing Stress of Asphalt Surface on Lean Concrete Base

2012 ◽  
Vol 178-181 ◽  
pp. 1402-1405
Author(s):  
Li Jun Suo
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Asphalt Pavement ◽  
Element Model ◽  
The Other ◽  
Three Dimension ◽  
Shearing Stress ◽  
Concrete Base ◽  
Contraction Joint ◽  
Decrease Decrease

In order to study the shearing stress of asphalt surface on lean concrete base, first of all, three–dimension finite element model of the asphalt pavement is established. The main objectives of the paper are investigated. One is calculation for shearing stress of asphalt surface in transverse contraction joint of lean concrete base, and the other is analysis for relationship between load stress of asphalt surface and parameters, such as thickness, modulus. The results show that maximum shearing stress, which is caused by load, is evident in asphalt surface which is located in transverse contraction joint of lean concrete base of asphalt pavement. Maximum shearing stress decrease, decrease, decrease and increase respectively with increase of the surface’s modulus, the surface’s thickness, base’s thickness and ratio of base’s modulus to foundation’s modulus.

A Stochastic-Based Method for Finite Element Model Validation

2011 ◽  
Vol 141 ◽  
pp. 162-167 ◽  
Author(s):  
Si Feng Bi ◽  
Zhong Min Deng
Keyword(s):  
Monte Carlo Simulation ◽  
Finite Element ◽  
Regression Analysis ◽  
Finite Element Model ◽  
Multivariate Regression ◽  
Iterative Procedure ◽  
Element Model ◽  
Multivariate Regression Analysis ◽  
Modeling Uncertainties ◽  
Simulation Results

A stochastic method integrating Monte Carlo simulation (MCS) and multivariate regression analysis is presented. The main purpose of this method is to validate a finite element model taking account of variability in test systems and modeling uncertainties. An improved MCS and an iterative procedure during correlation analysis are explained. Simulation results show that the proposed method provides a satisfactory validation outcome with acceptable calculation cost, and different correlation indices generate diverse variation curves of variables. MSC.Nastran is employed with a purpose to show the methodology’s commonality.

Effect of Interface Bond Condition on Airport Double-Layer Pavement Overlay’s Load Stress and Deflection

2013 ◽  
Vol 639-640 ◽  
pp. 429-433 ◽  
Author(s):  
Xing Zhong Weng ◽  
Xiang Cheng Yan ◽  
Wen Lu Liu ◽  
Lei Liang ◽  
Xin Qiang Li
Keyword(s):  
Double Layer ◽  
Coupling Coefficient ◽  
Three Dimensional ◽  
Element Model ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
Cement Concrete Pavement ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Interface Bond

In order to study the influence of interface bond condition between new and old cement concrete pavement on overlay performance, the three-dimensional finite element model of the airport double-layer pavement was established. The pavement overlay's load stress and deflection were analyzed, the coupling coefficient between new and old cement concrete pavement was calculated based on the bottom of overlay deflection basin shape factor. The results show that the coupling coefficient reflects the degrees of interface bond condition well. Poor interface bond condition increases the overlay's load stress and deflection. The points that more closely distance from the wheels load center, the bigger the pavement overlay's load stress and deflection is. Therefore, more attention should be paid to the interface bond condition during the airport pavement overlay's designs and constructions.

Modeling and Analyzing of Vibration in Working Crankshaft with Cracks

2005 ◽  
Vol 293-294 ◽  
pp. 401-408
Author(s):  
Xuan Yang Lei ◽  
Gui Cai Zhang ◽  
Xi Geng Song ◽  
Jin Chen ◽  
Guang Ming Dong
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
The Other ◽  
Lumped Mass ◽  
Beam Elements ◽  
System A ◽  
Nonlinear Motion ◽  
Simplified Finite Element Model ◽  
Bearing System

In this paper, a simplified finite element model of the cracked crankshaft is proposed, and a new method for simulating the nonlinear vibration of operating crankshaft with several cracks is presented. For crankshaft, cracks occur frequently in the parts of crankpin-web fillet region and the edge of oil aperture because of fatigue or damage. According to the characteristic of those cracks, the cracked parts are modeled by the corresponding cracked spatial finite elements respectively, and two cracked elements are discussed in this study. The other, un-cracked, crankshaft parts are modeled by spatial Timoshenko beam elements. Flywheel and front pulley are simplified as lumped mass elements, and main bearings are simulated by equivalent linear springs and dashpots. In order to find the dynamic response of crankshaft-bearing system, a right-handed rotating coordinate system attached to crankshaft is applied. Based on the proposed finite element model, the breathing behavior of cracks in operating crankshaft is studied, and the nonlinear motion equation with variational stiffness is formed. Finally, a four-in-line crankshaft is taken as an example, and its vibration response corresponding to different kinds of crack are calculated and analyzed. Some conclusions are drawn, and a foundation is laid for diagnosing crack fault of crankshaft.

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