scholarly journals Discussion on runoff purification technology of highway bridge deck based on water quality safety

2018 ◽  
Vol 38 ◽  
pp. 03043 ◽  
Author(s):  
Sheng-guang Tan ◽  
Xue-xin Liu ◽  
Guo-ping Zou ◽  
Xin-zhu Xiong ◽  
Shuang-cheng Tao
Keyword(s):  
Traffic Accidents ◽  
Reference Value ◽  
Emergency Operation ◽  
Automatic Identification ◽  
Highway Bridge ◽  
Construction Technology ◽  
Water Safety ◽  
Structure Sensitive ◽  
Purification Unit ◽  
Ecological Planting

Aiming at the actual problems existing, including a poor purification effect of highway bridge runoff collection and treatment system across sensitive water and necessary manual emergency operation, three kinds of technology, three pools system of bridge runoff purification, the integral pool of bridge runoff purification and ecological planting tank, are put forward by optimizing the structure of purification unit and system setting. At the same time, we come up with an emergency strategy for hazardous material leakage basing on automatic identification and remote control of traffic accidents. On the basis of combining these with the optimized pool structure, sensitive water safety can be guaranteed and water pollution, from directly discharging of bridge runoff, can be decreased. For making up for the shortages of green highway construction technology, the technique has important reference value.

High Pressure Rotary Jet Grouting Pile with Undrained Caisson Combined Construction Technology on Nearby Yangtze River Levee Protection

2013 ◽  
Vol 718-720 ◽  
pp. 1938-1944
Author(s):  
You Sheng Zhao ◽  
Bin Zhou
Keyword(s):  
High Pressure ◽  
Yangtze River ◽  
Engineering Application ◽  
Reference Value ◽  
Construction Technology ◽  
The Yangtze River ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Jet Grouting

t is easy to cause the Yangtze River embankment soil of slip even collapse to have a deep foundation pit construction adjacent to the Yangtze River outsideembankment,there are a lot of risk. In this paper, a new combining technique of construction for large caisson is presented. Based on the construction environment, theconstructiontechnology,the smaller earthwork excavation of deep high pressure rotary jet grouting pile with undrained caisson combined construction technology combined with monitoring data for the open caisson excavation control is adopted. It has achieved relatively good results and summarized the advantages of deep high pressure rotary jet grouting pile with undrained caisson combined construction technology in engineering application owing the reference value for engineering applications.

scholarly journals Hazard Assessment in Fars Province Hospitals in Iran in 2017

2020 ◽  
pp. 144-151
Keyword(s):  
Traffic Accidents ◽  
Negative Impact ◽  
Health Sector ◽  
Emergency Operation ◽  
Cross Sectional Study ◽  
Risk Scores ◽  
Fars Province ◽  
Cross Sectional ◽  
Chemical Threats ◽  
Operation Center

INTRODUCTION: Fars is a disaster-prone province which is affected by a myriad of disasters, such as floods, earthquakes, fires, and traffic accidents. Therefore, the present study aimed to evaluate the disaster risk of hospitals in Fars province in 2017. METHODS: This descriptive cross-sectional study was performed in 2017. Out of 90 hospitals in Fars province, 51 centers cooperated in the presented study. Six prevalent disasters and crises in Fars province were identified using the recorded incidents in the last 20 years in the Emergency Operation Center (EOC) of Shiraz University of Medical Sciences. A book entitled "National tools for the assessment of risks and indicators of specialized competencies of the health sector in response to hazards and disasters (risk map), which was written for the Ministry of Health of Iran in 2014, was used to assess and obtain the risk score. The maximum and minimum risk scores were obtained at 95 and 19, respectively, and the data were analyzed in Excel 2016. FINDINGS: The mean and standard deviation of the obtained scores for different hazards were reported as 56.039±175.785 (earthquake), 45.962 ± 322.17 (seasonal flood), 575.786.195±19.57 (drought), 909.18±686.36 (chemical threats), 47.764±18.066 (human-caused fires), and 50.235±15.709 (power outage). In most hospitals, the risk of earthquakes and the negative impact of drought were higher than other hazards, while the chemical threats obtained the lowest score. CONCLUSION: Since Fars province is a disaster-prone area, the risk assessment should be periodically performed at short intervals to identify hazards with higher risk scores and implement corrective measures in this regard.

scholarly journals Research on damage mechanism and protection of the collision penetration of the thin-walled long rod structure

2019 ◽  
Vol 103 (1) ◽  
pp. 003685041987421
Author(s):  
Zhi Zhi ◽  
ShiYong Guo ◽  
LuWei Chen ◽  
Yan Zhu
Keyword(s):  
Traffic Accidents ◽  
Reference Value ◽  
Element Model ◽  
Damage Mechanism ◽  
Penetrating Injury ◽  
Medical Software ◽  
Secondary Damage ◽  
Long Rod ◽  
Thin Walled ◽  
Peak Value

Traffic accidents have been closely concerned by the society, and the serious traffic accidents caused by vehicle and guardrail collisions are one of the main manifestations. However, the research in the field of vehicle and guardrail collisions is mainly limited to the waveform guardrail on the expressway, and there is little research on the urban road guardrail, especially in the secondary damage caused by guardrails field. Moreover, the collision between vehicle and the rectangular guardrail of city road is easy to form thin-walled long rod, and it penetrates the driver’s chest. To evaluate and analyze the injury results and mechanism of this phenomenon, a penetrating finite element model of chest bone characterized by Chinese human is established using the medical software (MIMICS) and engineering software (HYPERMESH). The model validation is mainly dependent on the corpse impact test. In addition, the software (LS-DYNA) is deployed to simulate the thin-walled long rod penetration. According to the analysis of the “PENETRATION,” it is found that the cavity effect produced by the thin-walled long rod through the chest, and the degree of chest damage is related to the speed, angle, weight, and stability of the thin-walled long rod. The difference between the peak value of collision corpse experiment and simulation peak value is less than 5%, which implies that the model is reasonable. Besides, the simulation results also confirm the accident and medical diagnosis cases. As a common form of secondary injury in traffic accidents and a typical case of medical penetrating injury, the thin-walled long rod penetrating injury has important reference value for studies in both directions.

Method of Determining the Length of Approach Slab for Highway Bridge

2014 ◽  
Vol 953-954 ◽  
pp. 1657-1662
Author(s):  
Zhi Yuan Wang ◽  
Hong Zhang ◽  
Ya Jun Wang
Keyword(s):  
Design Theory ◽  
Reference Value ◽  
Highway Bridge ◽  
High Grade ◽  
Size Parameter ◽  
Special Design ◽  
General Application ◽  
Approach Slab ◽  
Moving Vehicles ◽  
Setting Approach

Approach slab is mainly used to slowdown or reduce uneven settlement of bridge heads as far as possible. Setting approach slab at back of bridges and culverts is an effective and necessary way to avoid faulting slab ends between abutment and road in high-grade highway. It has come into general application and achieved good results. But nowadays, approach slab is designed based on previous experience or being set a size parameter directly instead of being made a special design. Theory and experience that the design based on is unreasonable. Author confirm the need for setting approach slab and give the reference value about length of approach slab for different grade highway according to analysis and study on the forced state of the moving vehicles at highway-bridge junction with or without approach slab.

scholarly journals Unraveling Urban Form and Collision Risk: The Spatial Distribution of Traffic Accidents in Zanjan, Iran

2021 ◽  
Vol 18 (9) ◽  
pp. 4498
Author(s):  
Mohsen Kalantari ◽  
Saeed Zanganeh Shahraki ◽  
Bamshad Yaghmaei ◽  
Somaye Ghezelbash ◽  
Gianluca Ladaga ◽  
...  
Keyword(s):  
Urban Form ◽  
Urban Areas ◽  
Traffic Accidents ◽  
Integrated Analysis ◽  
Automatic Identification ◽  
Metropolitan Regions ◽  
Car Accidents ◽  
Knox Test ◽  
Growing Economy

Official statistics demonstrate the role of traffic accidents in the increasing number of fatalities, especially in emerging countries. In recent decades, the rate of deaths and injuries caused by traffic accidents in Iran, a rapidly growing economy in the Middle East, has risen significantly with respect to that of neighboring countries. The present study illustrates an exploratory spatial analysis’ framework aimed at identifying and ranking hazardous locations for traffic accidents in Zanjan, one of the most populous and dense cities in Iran. This framework quantifies the spatiotemporal association among collisions, by comparing the results of different approaches (including Kernel Density Estimation (KDE), Natural Breaks Classification (NBC), and Knox test). Based on descriptive statistics, five distance classes (2–26, 27–57, 58–105, 106–192, and 193–364 meters) were tested when predicting location of the nearest collision within the same temporal unit. The empirical results of our work demonstrate that the largest roads and intersections in Zanjan had a significantly higher frequency of traffic accidents than the other locations. A comparative analysis of distance bandwidths indicates that the first (2–26 m) class concentrated the most intense level of spatiotemporal association among traffic accidents. Prevention (or reduction) of traffic accidents may benefit from automatic identification and classification of the most risky locations in urban areas. Thanks to the larger availability of open-access datasets reporting the location and characteristics of car accidents in both advanced countries and emerging economies, our study demonstrates the potential of an integrated analysis of the level of spatiotemporal association in traffic collisions over metropolitan regions.

scholarly journals Fractional Calculus Control of Road Vehicle Lateral Stability after a Tire Blowout

Mechanika ◽  
2021 ◽  
Vol 27 (6) ◽  
pp. 475-482
Author(s):  
Bing lin LI ◽  
Li ZENG
Keyword(s):  
Fractional Calculus ◽  
Traffic Accidents ◽  
Control Method ◽  
Reference Value ◽  
Stability Control ◽  
Degree Of Freedom ◽  
Lateral Stability ◽  
Vehicle Performance ◽  
Nonlinear Control Method ◽  
Yaw Moment

The lateral stability control of the vehicle can avoid serious traffic accidents when it had a tire blowout during the operation. This article proposes a robust nonlinear control method for controlling vehicle lateral stability after a tire blowout. To be exact, a seven degree of freedom dynamic model of vehicle with modified Dugoff tire model is established. The yaw moment of vehicle is performed by differential braking once the tire blowout occurring. As for control strategy, taking the linear two degree of freedom vehicle model as the reference, using the deviation of yaw rate and the vehicle side angle between the actual value and the reference value as the controller input parameters, the fractional calculus theory is utilized for yaw moment controller which was investigated by regulating the brake moment of blowout vehicle for improving its stability. The results of computer simulation show that the design controller of fractional PID can more effectively enhance the blowout vehicle performance stability compared with the vehicle with the non control, PID control, no matter in straight road or curve road.

scholarly journals Quality Control Measures in Highway Bridge Construction

2017 ◽  
Vol 6 (2) ◽  
Author(s):  
Bing Fu
Keyword(s):  
Quality Control ◽  
Control Strategies ◽  
Modern Society ◽  
Control Measures ◽  
Bridge Engineering ◽  
Highway Bridge ◽  
Construction Technology ◽  
Bridge Construction ◽  
China Development

Highway bridge engineering is an important part of modern transportation system. It has a great effect on the devel-opment of modern society. Therefore, it is very important to ensure the construction quality of highway bridge engi-neering. At present, there are more and more construction technology quality control issues in the construction of high-way bridges should be given enough attention. The problems should be actively found out and effectively solved to improve the quality of life, while promoting China development of infrastructure construction. This paper analyzes the quality control strategies in the highway bridge construction.

scholarly journals Influence of Radar and Gauge Rainfall Data Sources on the Analysis of Spatial Distribution of Traffic Accidents and Rainfall Events

2020 ◽  
Vol 10 (20) ◽  
pp. 7327
Author(s):  
Seong-Sim Yoon ◽  
Un Ji ◽  
Inhyeok Bae
Keyword(s):  
Spatial Distribution ◽  
Traffic Accidents ◽  
Reference Value ◽  
Radar Data ◽  
Rainfall Data ◽  
Assessment Tools ◽  
Severe Injury ◽  
Rainfall Distribution ◽  
Rainfall Events ◽  
Study Results

The records of 24,797 traffic accidents (9039 involving fatalities or severe injury) during rainy conditions from 2007 to 2017 in Seoul, South Korea, were used to analyze the spatial distribution of the traffic accidents and rainfall events based on radar and gauge rainfall data. According to the spatial correspondence analysis between rainfall distribution and accident locations for localized and stratiform rain events, radar data in a two-dimensional grid (250 by 250 m) of 10 min temporal resolution benefited the localized rainfall distribution concerning the accident location. The relative accident rate (RAR) from radar data, which was used as a quantitative reference value for the effect of rainfall on traffic accidents, was about 18% higher than that from gauge rainfall. The radar data more clearly classified the number of traffic accidents during rainy conditions because its spatial distribution was more precise for all accidents. In addition, the RAR estimation of accidents involving fatalities and severe injury during rainfall could provide information on the district in which traffic accidents increase due to rainfall. The study results support the adoption of radar-derived rainfall data to analyze the influence of rainfall on accidents and the development of more accurate risk-assessment tools for drivers and planners.

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