Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
International Journal of Highway Engineering
Journal Basic Information
Journal DOI :
Korean Society of Road Engineers
Editor in Chief :
Volume & Issues
Volume 10, Issue 4 - Dec 2008
Volume 10, Issue 3 - Sep 2008
Volume 10, Issue 2 - Jun 2008
Volume 10, Issue 1 - Mar 2008
Selecting the target year
Development of 3-Dimensional Sight Distance Model for Highway Alignments
Park, Je-Jin ; Choi, Joo-Yong ; Ha, Tae-Jun ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 1~9
Five bases for of highways are sight distance, vehicle stability, driver comfort, drainage and aesthetics. Among these bases, the sight distance is the most critical one in the highway alignment design. It is certain that highways and drivers' observation actions are 3-dimensional in nature. But, the highway alignment design and the sight distance analysis have been performed on 2-dimensional planes because of various constraints and complexity of calculating 3-dimensional sight distance. The purpose of this study is to derive a model for determining exact available sight distance in 3-D combined horizontal and vertical alignments. Application of the model is illustrated using numerical examples. The proposed model should be useful in quantifying the criteria for 3-D highway alignments.
Stress Analysis in Waterproof Layer on Steel Bridge Deck Pavement Using Finite Element Analysis
Woo, Young-Jin ; Lee, Hyun-Jong ; Park, Hee-Mun ; Choi, Ji-Young ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 11~18
The behavior of pavement and waterproofing layer on the steel bridge deck system under traffic loading was analyzed using a finite element method in this paper. In the finite element analysis, the othotropic steel bridge deck is represented by equivalent plate using solid element instead of shell element and the interface is assumed perfect bonding state. The effects of several parameters such as thickness of deck, Young's modulus of deck, thickness of pavement, different braking loading, and temperature on the stresses and strain in the interface are investigated for bridge deck pavement. The shear stress of waterproof layer increases with decrease of bridge deck thickness and stiffness. The change of shear stress is negligible when the bridge deck thictaess is greater than 150mm and stiffness is greater than
. As the pavement thickness and temperature decrease, the shear stress in the waterproof layer tends to be increased. The tensile strain at the bottom asphalt layer decreases as the temperature and thickness increase.
What goes problematic in the Existing Accident Prediction Models and How to Make it Better
Han, Sang-Jin ; Kim, Kewn-Jung ; Oh, Sun-Mi ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 19~29
The main purpose of this study is to introduce Hauer's(2004) approach that overcomes current accident prediction models' limitation and to apply this approach to Korean situation using fatal accident data on motorways. After developing accident prediction models according to this approach, it is found that AADT and vertical grade could improve fitness of the model, whereas a radius of roads is not related to the number of accidents. The advantage of Hauer's approach is to reduce possibility to eliminate critical variables and to keep uncritical variables when we consider many variables to develop accident prediction models.
Developing the Traffic Accident Prediction Model using Classification And Regression Tree Analysis
Lee, Jae-Myung ; Kim, Tae-Ho ; Lee, Yong-Taeck ; Won, Jai-Mu ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 31~39
Preventing the traffic accident by accurately predicting it in advance can greatly improve road traffic safety. The accurate traffic accident prediction model requires not only understanding of the factors that cause the accident but also having the transferability of the model. So, this paper suggest the traffic accident diagram using CART(Classification And Regression Tree) analysis, developed Model is compared with the existing accident prediction models in order to test the goodness of fit. The results of this study are summarized below. First, traffic accident prediction model using CART analysis is developed. Second, distance(D), pedestrian shoulder(m) and traffic volume among the geometrical factors are the most influential to the traffic accident. Third. CART analysis model show high predictability in comparative analysis between models. This study suggest the basic ideas to evaluate the investment priority for the road design and improvement projects of the traffic accident blackspots.
An Experimental Study on the Characteristics of Earth Pressure to a Debris-fall Prevention Wall
Yoon, Nam-Sik ; Park, Yong-Won ; Park, Myoung-Soo ; Choi, Yi-Jin ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 41~48
This paper deals with the characteristics of earth pressure to the debris-fall prevention walls which usually are installed in front of steep slope. Such walls have narrow backfill width where the active soil wedge can not be developed fully. The earth pressure to such walls ue affected by the movement of wall and arching effects due to the friction developing on the surface of adjacent ground slope and wall and therefore cannot be analyzed and calculated reliably. The study is carried out through laboratory model tests using centrifuge test. Test results reveal that the earth pressure to the debris-fall prevention wall depends largely on the inclination angle of the ground slope and the wall movement. The earth pressure reduction due to wall movement was observed at the upper half of wall, while the arching effect was significant at the lower half especially in the case of steep ground slope. It can be said that from the result of this study in the design of a debris-fall prevention wall the earth pressure should be determined considering the inclination of ground slope and the condition of wall movement during and after construction.
Repeated Load Triaxial Tests on Unbound Geomaterials in Pavement Foundations
Park, Seong-Wan ; Hwang, Kyu-Young ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 49~62
This paper presents the results of a study that was performed to evaluate the characteristics of deformation under repeated loadings in unbound geomaterials of pavements. Two important parameters, resilient and permanent deformation were estimated using the repeated load triaxial test. In addition, the effects of different stress state and environmental conditions with various materials were evaluated. Due to the locking mechanism and resiliency of unbound geomaterials, a consistent increase in permanent deformation on unbound geomaterials was observed and the asymptotic condition is slightly reached. In conclusion, the results show that selected models and parameters are satisfactory to predict permanent deformations after a certain number of loadings.
Prediction of Resilient Deformation and Stress-Dependent Behaviors on Geomaterials in Pavement Foundation
Park, Seong-Wan ; Hwang, Kyu-Young ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 63~74
Resilient deformation characteristics on unbound pavement materials have been adopted for design and nonlinear analysis of pavement structure under traffic loadings. However, relatively few studies have been done on the nonlinear resilient behavior of unbound pavement materials in Korea. In addition, only the limited information is available for estimating the resilient modulus values on unbound materials. In this study, a laboratory resilient-deformation test under repeated loadings is performed in order to fud a proper constitutive model that correlates the resilient modulus with stress state from field condition. Finally, a finite element analysis is conducted for evaluating the nonlinear characteristics of unbound materials. and the pavement performance respectively.
Effect of Repeated Immersion on Material Properties of Asphalt Mixtures
Hwang, Sung-Do ; Rhee, Suk-Keun ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 75~85
Moisture damage of asphalt mixtures can occur because of a loss of bond between the asphalt binder and the fine and coarse aggregates. Therefore, moisture damage on asphalt pavements is the main cause of potholes, which is one of the main distress type of asphalt pavement. The purpose of this study is to evaluation effect moisture damage on material properties of asphalt mixtures through the laboratory performance test. The existing Modified Lottman test procedure was improved and the number of times that thermal cyclic conditioning can be added until the asphalt mixtures is damaged, was tested in order to exhibit the changes of the material properties because of moisture damage by immersion. Through the above experiments, it was found that the material properties of asphalt mixtures on room-temperature were rapidly decreased with loss of about 50% at initial stage of moisture damage caused by the amount of repeated immersion. Also, it was found that the property damage ratio using material properties of failure energy and
by test temperature
were showed a high relationship to moisture damage of the asphalt mixtures caused by the amount of repeated immersion.
Material Tests for Module Type Crash Cushion
Ko, Man-Gi ; Kim, Kee-Dong ; Sung, Jung-Gon ; Kim, Jin-Man ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 87~95
One way to shield an atypical structure to secure the occupant safety of an impact vehicle is to stack energy absorbing material modules around the structure. To be applicable to a cushion module, material must have enough energy absorbing capabilities while satisfying the safety requirements of the vehicle occupant. Static compression test of the potential materials gives a good indication which material is good for a slacking module. This paper presents the mechanical properties that a cushion material must have to satisfy the safety requirements. Static tests are performed for Quard-Guard system module, sand bag, recycled tires, Geo-Container, Geo-Cell and Expanded Polystyren (EPS) Blocks. Static test results are discussed and EPS block of
density showed good potential for a cushion module. To check the dynamic effect of EPS block, drop tests have been made up to 35.6km/h impact speed. Drop test results are compared with static test results and no appreciable difference was found. To improve the EPS module property, making holes to the block is suggested and drop test are performed for the modified blocks. From the drop test results, design values are suggested.
Analysis Method of Module Type Crash Cushion
Ko, Man-Gi ; Kim, Kee-Dong ; Sung, Jung-Gon ; Yun, Duk-Geun ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 97~104
Many atypical structures on the roadside are exposed to traffics unshielded posing great danger. One way to shield an atypical structure to secure the occupant safety is to stack energy absorbing material modules in front of the structure. This paper presents the analysis method of module type crash cushion made of EPS blocks using simple energy balance of the car and crash cushion and numerical examples for 0.9ton-500km/h, 0.9ton-60km/h and 0.9ton-70km/h impact are presented. This method gives simple estimation of maximum acceleration, time of crash, whether or not the vehicle stops completely before whole cushion is being crushed. However, since the acceleration and velocity data from the analysis is so crudely spaced that calculation of safety indices such is RA and OIV is not possible. Problem is overcome by using data interpolation. The spline and linear interpolation is introduce and safety analysis is made and the results are compared.
Effect of temperature and moisture on curling of early age concrete slabs
Sun, Ren-Juan ; Nam, Young-Kug ; Hong, Seung-Ho ; Jeong, Jin-Hoon ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 105~115
It is known that the long-term behavior and performance of jointed concrete pavement due to slab curling are affected by the environmental factors such as temperature, moisture, and so on. However, any relationships between the curling and its factors have not been defined clearly yet because of insufficient detailed investigation. The temperature, relative humidity, strain, vertical displacement of a concrete slab, and horizontal movement of its transverse joints were investigated by various sensors and devices instrumented in the slab of a concrete pavement section constructed for this study. The constraint of the curling by joint stiffness was investigated in addition to effect of the temperature and moisture on the early aged concrete slab by analyzing the field data measured for approximately 4days from concrete placement. The curling of the concrete slab showed 24hour cycles mainly because of the temperature effect, and the upward curling gradually increased because of the long-term effect of drying shrinkage of the concrete. The magnitude and variation of the curling were significantly affected by the joint stiffness which is comprised of aggregate interlocking and other factors. The effect of the variation of the seasonal joint stiffness varying with the temperature and long-term drying shrinkage on the slab curling will be investigated as a further study.
Measurement of the Early-Age Coefficient of Thermal Expansion and Drying Shrinkage of Concrete Pavement
Yoon, Young-Mi ; Suh, Young-Chan ; Kim, Hyung-Bae ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 117~122
Quality control of the concrete pavement in the early stage of curing is very important because it has a conclusive effect on its life span. Therefore, examining and analyzing the initial behavior of concrete pavement must precede an alternative to control its initial behavior. There are largely two influential factors for the initial behavior of concrete pavement. One is the drying shrinkage, and the other is the heat generated by hydration and thermal change inside the pavement depending on the change in the atmospheric temperature. Thus, the coefficient of thermal expansion and drying shrinkage can be regarded as very important influential factors for the initial behavior of the concrete. It has been a general practice up until now to measure the coefficient of thermal expansion from completely cured concrete. This practice has an inherent limitation in that it does not give us the coefficient of thermal expansion at the initial stage of curing. Additionally, it has been difficult to obtain the measurement of drying shrinkage due to the time constraint. This research examined and analyzed the early drying shrinkage of the concrete and measurements of the thermal expansion coefficients to formulate a plan to control its initial behavior. Additionally, data values for the variables of influence were collected to develop a prediction model for the initial behavior of the concrete pavement and the verification of the proposed model. In this research, thermal expansion coefficients of the concrete in the initial stage of curing ranged between
Furthermore, the effects of the size and depth of the concrete on the drying shrinkage were analyzed and confirmed.
A Study on Development & Establishment of Performance Evaluation Criteria for Guardrail End Treatments
Joo, Jae-Woong ; Kum, Ki-Jung ; Park, Je-Jin ; Jang, Dae-Young ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 123~134
Since the end treatments of guardrails installed on domestic roads have the shapes which can easily penetrate and turnover a vehicle, the occupant can be subjected to severe injury when a vehicle impacts the end treatments. In this study, the criteria of performance evaluation for end treatments are suggested which are suitable to domestic road circumstances. Based on the investigation for the installation and studies instances of end treatments, the mechanism of end treatments is examined and the new end treatment suitable to domestic road circumstances is suggested. The suggested end treatment was verified by computer simulation using d LS-DYNA programs and satisfied the suggested performance evaluation criteria for end treatments. And the developed end treatment was verified by full-scale vehicle crash test and satisfied the following three primary appraisal factors of the suggested performance evaluation criteria for end treatments; occupant risk criteria, structural adequacy, and after-collision vehicle trajectory. This study is the first to develop end treatments considering the occupant safety in Korea. Therefore, If the developed end treatments is installed on roads and highways, it can be expected that it will reduce the grave situation of end treatment accidents and increase the safety of roads.
Variation of Moving Dynamic Vehicle Loads According to Surface Smoothness of Pavement Systems
Kim, Seong-Min ; Rhee, Suk-Keun ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 135~144
The dynamic loads imposed by moving vehicles have variations in the magnitude due to the surface roughness of the pavement systems and the larger dynamic loads than the design loads may affect the pavement performance. This paper presents variations of the moving dynamic vehicle loads due to the pavement surface roughness. This study was performed as a basic study to apply the pay factor to the surface roughness for the improvement of pavement quality and performance. The profile data was obtained from the old and new pavements and the analysis was performed to investigate the dynamic loads when vehicles move on the pavements having those profiles. The artificial profiles were also developed to find the effects of the vehicle speed, wavelength and amplitude of the surface roughness on the dynamic vehicle loads. The increase in the load magnitude due to the surface roughness affects the stresses and strains of pavements and finally reduces the pavement life. The methodology to obtain the relationship between the surface roughness and the pavement performance was proposed in this study.
Quality of Departure Time Based On-line Link Travel Time Estimates
Park, Dong-Joo ; Kim, Jae-Jin ; Rho, Jung-Hyun ; Kim, Sang-Beom ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 145~154
The purpose of this study is to evaluate the quality of on-line departure time-based link travel time estimates. For this, accuracy (i.e. estimation error) and timeliness (i.e. degree of time lag) are proposed as MOE of the quality of on-line link travel time estimates. Then the relationship between quality of link travel time estimates and link length and level of congestion is analyzed. It was found that there is trade-off between the accuracy and timeliness of link travel time estimates. The estimation error was modeled to consist of two components: one is systematic error and the other is mean square error which reflects level of congestion. further, time lag was again segmented into three parts for the analysis purpose. There are minimum one, congestion-related one, and update interval-related one. From the real-world data using AVI system, it was revealed that regardless of the link length and level of congestion, 10 minutes of time lag occurs in general.
Real-time Travel Time Estimation Model Using Point-based and Link-based Data
Yu, Jeong-Whon ;
International Journal of Highway Engineering, volume 10, issue 1, 2008, Pages 155~164
It is critical to develop a core ITS technology such as real-time travel time estimation in order that the efficient use of the ITS implementation can be achieved as the ITS infrastructure and relevant facilities are broadly installed in recent years. The provision of travel time information in real-time allows travellers to make informed decisions and hence not only the traveller's travel utilities but also the road utilization can be maximized. In this paper, a hybrid model is proposed to combine VDS and AVI which have different characteristics in terms of space and time dimensions. The proposed model can incorporate the immediacy of VDS data and the reality of AVI data into one single framework simultaneously. In addition, the solution algorithm is made to have no significant computational burden so that the model can be deployable in real world. A set of real field data is used to analyze the reliability and applicability of the proposed model. The analysis results suggest that the proposed model is very efficient computationally and improves the accuracy of the information provided, which demonstrates the real-time applicability of the proposed model. In particular, the data fusion methodology developed in this paper is expected to be used more widely when a new type of traffic data becomes available.