Hagiwara M.,East Nippon Expressway Co. |
Mizuno A.,Kogakuin University |
Tsutaki T.,Kogakuin University |
Takahashi K.,FITUT Laboratory Co.
BHR Group - 14th International Symposium on Aerodynamics and Ventilation of Tunnels | Year: 2011
In the semi-underground portions there is an exchange of air through the gaps of the structure over them caused by the traffic and natural wind. This breathing phenomenon has been studied and estimated so far, but they don't refer to the influence of the structure over expressways on the breathing. We adapt the 3D numerical simulations with the traffic included in it to a certain semi-underground road with a complex overhead structure such as beams and roofs in order to estimate their influence on the breathing. In this paper we present some of the results and then discuss them. © BHR Group 2011.
Akiyama M.,Waseda University |
Abe S.,Obayashi Corporation |
Aoki N.,East Nippon Expressway Company Ltd |
Suzuki M.,Tohoku University
Engineering Structures | Year: 2012
In this study, a prestressed reinforced concrete pile that uses high-strength material to increase the pile's flexural capacity was developed. The main structural characteristics of the developed pile include (1) the neutral axis is constantly near the centroidal axis of the pile, even if the longitudinal reinforcement yields due to a flexural moment, because the pile has a high axial compressive force that is induced by prestressed steel bars, and hence, the concrete in the compression region can contribute to increasing the flexural strength of the pile; and (2) the flexural strength of the pile increases because the high-strength concrete is confined by high-strength spirals and carbon-fiber sheets in combination with concrete infilling, and, together, these modifications provide a sufficiently high lateral-confinement pressure. The results of bending tests demonstrate that the proposed prestressed reinforced concrete pile with carbon-fiber sheets and concrete infilling had a much higher flexural capacity than a conventional precast concrete pile. In addition, an analytical approach is presented that can be used to obtain the relationship between the bending moment and the curvature of the proposed pile. Even if concrete bridge systems are constructed on strata that can experience soil liquefaction, such as very soft soil, bridge foundations that use the proposed piles could remain undamaged under the design seismic action. © 2011 Elsevier Ltd.
Moriyoshi A.,Hokkaido University |
Takahashi N.,East Nippon Expressway Ltd. |
Ikeda O.,East Nippon Expressway Ltd. |
Kawashima M.,East Nippon Expressway Ltd. |
Akabane T.,Marubeni Information Systems Ltd.
Construction and Building Materials | Year: 2013
In general rutting in asphalt pavements occurs at high temperatures and cracks occur at cold temperatures. It has been believed that longitudinal cracks mainly arise due to the shear of moving wheels at high temperatures. This research performed wheel tracking tests at 45 °C on asphalt samples in holders which at one end consists of transparent glass. The distribution of the tensile and shear strains using the ARAMIS System for gathering data of the exposed end (30 × 5 cm) of the specimens visible through the transparent glass was measured. Thereafter, specimens (5 × 8 × 2.5 cm) cut from large specimen (5 × 30 × 30 cm) for CT scanner. The width of crack was also analyzed by CT scanner in three dimensional. It was found that the rutting depth in all specimens after 1 h (2400 wheel passes) at 45 °C was smaller than 1 mm, but that the tensile strains in all specimens at 1 hour were 25,000 × 10-6 (2.5%) or larger and a strain of 3.69% which corresponds to a longitudinal crack width of 0.555 mm by CT analysis and ARAMIS system. It was also found that the cracks at the high temperature under the moving wheels were mainly caused by the tensile strain rather than shear strain and the load spreadability in mixtures depends upon the type of mixture and properties of asphalt. It is concluded that both methods are useful to evaluate the damage of mixture. © 2012 Elsevier B.V. All rights reserved.
Fukada S.,Kanazawa University |
Usui K.,Fuji Engineering Co. |
Yoshimura T.,Kobe Steel |
Okada T.,Kobe Steel |
And 2 more authors.
Journal of Civil Structural Health Monitoring | Year: 2012
An environmental vibration problem occurred at a house near a highway bridge on soft ground. Vibration experiments with a test truck were performed to investigate the cause of the problem and the vibration characteristics of the bridge and house. Experimental results showed that the house was resonating with the bridge. As a measure to reduce vibration, viscoelastic dampers were installed at the ends of the bridge girders. The effectiveness of this measure was evaluated by comparing the data gathered before and after the installation of the dampers using ordinary trucks running over the bridge. Moreover, a dynamic response analysis was carried out to investigate the vibration reduction as a function of the number of installed dampers as well as the various analytical conditions employed. Simulation results showed that the vibration reduction depends on the boundary condition, running position, and torsion modes that have a coupling vibration between the superstructure and the piers. © 2012 Springer-Verlag.
Fukuda T.,Geoscience Research Laboratory Co. |
Takahashi T.,East Nippon Expressway Company |
Yamada H.,Konoike Construction Co. |
Jiang Y.,Nagasaki University
Harmonising Rock Engineering and the Environment - Proceedings of the 12th ISRM International Congress on Rock Mechanics | Year: 2012
In the design phase of the tunnel, various mechanical constants and their distribution are estimated after comparing research and exploration results with rock mass classification. Based on the estimation, the support pattern is selected and appropriate materials are suggested by numerical analysis, if necessary. In this study, from the perspective of advanced observational construction, we describe the identification of rock physical properties by back analysis and the predictive analysis of long-term deformation of tunnel lining targeting on the tunnel with large deformation. As a result, the most appropriate support pattern was determined by identifying rock physical properties, and an example of long-term predictions of tunnel lining deformation could be presented. © 2012 Taylor & Francis Group, London.
Kasai M.,Tokyo University of Science |
Uesugi R.,East Nippon Expressway Company |
Takasawa S.,Tokyo University of Science |
Terabe S.,Tokyo University of Science
IEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC | Year: 2011
This study examines the learning process of users in mode choice behavior through an experiment on iterative trips simulating Dynamic Park and Ride (DP&R) as a new Travel Demand Management (TDM) scheme. The learning process is reviewed by three different analyses: 1) a cross-sectional analysis, 2) a longitudinal analysis using pooled data on experiences in the most recent trial, and 3) a longitudinal analysis that takes into account the cumulative effects of all preceding trials. Findings are summarized as follows: travel times expected by participants have an effect on mode choice, and past experiences as well as the most recent experience also have an effect. The paper concludes with a discussion of the importance of considering learning effects for widespread adoption of a new conceptual TDM scheme. © 2011 IEEE.
Xing J.,Nippon Expressway Research Institute Co. |
Muramatsu E.,East Nippon Expressway Company Ltd |
Harayama T.,East Nippon Expressway Company Ltd
19th Intelligent Transport Systems World Congress, ITS 2012 | Year: 2012
This paper is focused on an application and evaluation of a lane use balancing measure with the variable message signs (VMS) installed on both sides of a carriageway in a bottleneck of a 3-lane section. This is achieved by providing messages such as "Please stay in left hand lane" displayed on the roadside VMS or "Please use left hand lane(s)" on the VMS in the median strip or "Please keep left after merge" on the entrance ramp to persuade drivers to use the left hand lanes as much as possible. It was found that use of the outer lane increased and consequently use of the median lane decreased by 3%, which resulted in slightly more balanced lane use across the carriageway. The measure can also possibly reduce platoon size or to prevent platoons from growing. As a result, traffic congestion that previously occurred at a relatively low breakdown flow less than 4,800 vph is not likely to happen with the VMS. It also reduces the probability of occurrence of traffic congestion at high flows. Compared to 4,789 vph without the VMS, the average breakdown flow increased to 5,079 vph with an increase of 290 vph (+6%), the effect being three times that with the roadside VMS only.
Takahashi S.,East Nippon Expressway Co.
Road Materials and Pavement Design | Year: 2013
Porous asphalt has spread widely across Japanese expressways as the standard surface course material since 1998, greatly contributing to the decrease in the number of traffic accidents on wet surface conditions. On the other hand, due to rainwater penetration through the porous surface, water sensitivity of the binder course layer becomes a key issue to secure its durability. This paper summarises the successful performance of porous asphalt surface courses based on a long-term survey over nearly 15 years in fields, also describing the negative impacts of porous asphalt. The experience shows that the durability of the binder course should be taken into consideration when a porous asphalt surface course is applied over old existing roads. This is vitally important if porous asphalt is to perform its excellent functions over a full service life by avoiding unexpected damage of the pavement. © 2013 Copyright Taylor and Francis Group, LLC.
Tanikawa T.,East Nippon Expressway Co.
Proceedings of the Institution of Civil Engineers: Forensic Engineering | Year: 2016
In the event of disasters, one of the most important priorities for rescue agencies at an early stage is to secure traffic on routes connecting with the affected areas. In the Great East Japan Earthquake, 2310 km of the expressway network operated by East Nippon Expressway Co., Ltd. (Nexco East) was closed. However, within 20 h approximately 770 km was reopened for ordinary traffic and approximately 1040 km for emergency vehicle use. Thirteen days afterwards, temporary repair works had been completed; all expressways were opened to all traffic, which contributed to emergency restoration activities. Based on the experience of this earthquake, Nexco East has been improving its disaster response capability and developing measures such as the utilisation of rest areas as disaster response bases, introducing inspection procedures in the early stages after disaster occurrence and strengthening cooperation with related organisations. © 2016, Thomas Telford Services Ltd. All rights reserved.
Marumo H.,East Nippon Expressway Co. |
Yokota M.,East Nippon Expressway Co.
20th ITS World Congress Tokyo 2013 | Year: 2013
Since Smart Phone(iPhone, Android etc.) use has been becoming widespread recently in Japan, and as these devices are recognized as being high-function information processors, they are also available as information provision devices. The authors developed a safe-driving support system (application), named "Highway Safety", targeting the use of smart phones as devices for collecting and providing information, in order to enhance the safety of road users driving in winter on expressway. Specifically, utilizing image recognition technology to provide advance aural alerts of hazardous places, the authors have developed a system having the following four functions. First, in a function for traffic control alerts, an alarm (message) is transmitted when a vehicle approaches a traffic lane regulation zone, warning the driver that the vehicle is approaching the traffic lane regulation zone or the tail of a traffic congestion. (Warning signs, arrow boards, or rubber cones are automatically detected in real time using image processing.) Second, in a function for requesting safe driving and providing drifting alerts, a caution is issued urging "safe driving" in compliance with expressway regulations, and an alert is issued to prevent accidents in cases where drifting or lane departure is detected automatically. (The white line on the road is detected automatically using image processing.) Third, an alert transmitting function is provided to prevent crashes by measuring the distance from the car ahead. Finally, a warning function is provided regarding accident black spots, developed utilizing the GPS information in a smart phone. A function for providing aural warnings has also been developed utilizing a preset database of accident black spots (near-miss incident points) in winter, obtained from accident statistics and so on. The results of item-by-item field evaluations of the above-mentioned functions and the effectiveness and limitations of this system on expressways are described.