Integral safe expansion joint: a new long-service-life joint for bridges

2019 ◽  
Author(s):  
Jorge Aparicio García
Keyword(s):  
Service Life ◽  
Life Cycle Cost ◽  
Structural Engineering ◽  
Road User ◽  
Expansion Joint ◽  
The Road ◽  
Thermal Range ◽  
Toll Road ◽  
Conservation Costs ◽  
Bridge Joints

<p>The integral expansion joint is a novel bridge expansion joint for bridges and viaducts with three breakthrough characteristics: (1) allows continuous driving, therefore (i) reducing the risk of accidents and increases safety for the road user and their vehicles; (ii) mitigating noise (the bump effect from conventional joints); (2) avoids the filtering of water, detritus and de-icing salts reducing conservation costs (opex and capex) of bridge substructures; (3) has a long-service life vis-à-vis conventional joints, therefore: (i) reducing the maintenance expenditure in bridge joints (life-cycle cost analysis); (ii) reducing traffic cuts and diversions, relevant for toll road operators where there is payment for - or penalties due to lack of – availability and (iii) reducing potential management liability due to improper maintenance. At an affordable supply and installation cost - aligned to conventional joints -, the integral expansion joint aims to solve a well-documented and historical problem in Structural Engineering, strengthening the most vulnerable part of any bridge and road surface. It can be prefabricated or manufactured in situ, implemented in all kind of bridges (new or rehabilitation), in any geography (thermal range), regardless of length of the deck or skewness, and in any material (concrete or metal).</p>

scholarly journals Persepsi Perubahan Aspek Sosial, Ekonomi, dan Lingkungan Terhadap Keberadaan Jalan Tol Layang AP Pettarani

2021 ◽  
Vol 6 (2) ◽  
pp. 68
Author(s):  
Lambang Basri Said ◽  
Ilham Syafei ◽  
Watono Watono ◽  
Fadel Muhammad Anis ◽  
Muhammad Yusuf Al Makassari
Keyword(s):  
Environmental Changes ◽  
Social Economic ◽  
Road User ◽  
The Road ◽  
Goods And Services ◽  
Toll Road ◽  
National Economic ◽  
Written Form ◽  
Ujung Pandang ◽  
Relationship Of

Keberadaan Jalan Tol Layang AP Pettarani sebagai bagian dari Jalan Tol Ujung Pandang, sangat diharapkan menjadi salah satu solusi transportasi darat sebagai angkutan logistik penunjang pertumbuhan ekonomi secara nasional, khususnya dalam rangka mengatasi kemacetan serta mendukung mobilitas barang dan jasa di Kota Makassar. Perubahan sosial, ekonomi, dan lingkungan tersebut merupakan pengaruh yang ditimbulkan atau kemungkinan besar akan terjadi, yang menyangkut keadaan sosial, ekonomi, dan lingkungan masyarakat pengguna jalan.Penelitian ini bertujuan untuk menganalisis seberapa besar persepsi perubahan aspek sosial, ekonomi, dan lingkunganmasyarakat pengguna jalanterhadap keberadaan jalan tol layang AP Pettarani. Jenis data yang digunakan dalam penelitian ini adalah data subyek. Data kuesioner yang digunakan adalah dari hasil jawaban responden atas pertanyaan yang diajukan penulis kepada responden dalam bentuk tulisan. Adapun untuk mengetahui hubungan variabel-variabel yang mempunyai hubungan, maka dilakukan pengujian hipotesis dengan perhitungan statistik. Untuk penganalisisan data digunakan SPSS versi 21.00 dalam model dan pengkajian hipotesis. Berdasarkan dari hasil kuesioner maka didapatkan variabel-variabel mana saja yang mempunyai pengaruh signifikan terhadap keberadaan jalan tol layang AP Pettarani.The existence of the AP Pettarani Flyover Toll Road as part of the Ujung Pandang Toll Road, is expected to be one of the land transportation solutions as a logistical transportation to support national economic growth, especially in the context of overcoming congestion and supporting the mobility of goods and services in Makassar City. These social, economic, and environmental changes are the effects that are caused or will most likely occur, which involve the social, economic, and environmental conditions of road user communities. This study aims to analyze how much the perception of changes in social, economic, and environmental aspects of the road user community to the existence of the AP Pettarani flyover. The type of data used in this study is subject data. Questionnaire data used are the results of respondents' answers to questions raised by the author to respondents in written form. As for knowing the relationship of the variables that have a relationship, then testing the hypothesis with statistical calculations. For analyzing data SPSS version 21.00 is used in the model and hypothesis assessment. Based on the results of the questionnaire, it is obtained which variables have a significant influence on the existence of the AP Pettarani flyover.

Experimental Study on Mix Ratio Design and Road Performance of Medium and Small Deformation Seamless Expansion Joints of Bridges

2021 ◽  
pp. 036119812098474
Author(s):  
Pengzhen Lu ◽  
Chenhao Zhou ◽  
Simin Huang ◽  
Yang Shen ◽  
Yilong Pan
Keyword(s):  
Traffic Safety ◽  
Performance Test ◽  
Asphalt Mixture ◽  
Small Deformation ◽  
Expansion Joint ◽  
Expansion Joints ◽  
Mixture Ratio ◽  
The Road ◽  
Marshall Test ◽  
Road Performance

Expansion joints are a weak and fragile part of bridge superstructure. The damage or failure of the expansion joint will lead to the decline of bridge durability and endanger the bridge structure and traffic safety. To improve the service life and performance of bridge expansion joints, the ideal method is to use seamless expansion joints. In this study, starting from the commonly used asphalt mixture gradation of seamless expansion joint, and taking into account the actual situation of bridge expansion joint structure and environment in China, the gradation and asphalt-aggregate ratio are preliminarily designed. Through a Marshall test, the corresponding asphalt mixture is evaluated and analyzed according to the stability, flow value, and void ratio, and the optimal gradation and asphalt-aggregate ratio are determined. Finally, the asphalt mixture is prepared with the mixture ratio design, and the test results of an immersion Marshall test, fatigue performance test, and full-scale test verify that the asphalt mixture meets the road performance requirements of seamless expansion joints. On the basis of the experimental data, the performance of large sample asphalt mixture is continuously tested, compared, and optimized. The results show that the asphalt mixture ratio designed is true and reliable, which can provide reference for the optimal design of seamless expansion joint filler.

Determining Minimum Contract Time for Highway Projects

2000 ◽  
Vol 1712 (1) ◽  
pp. 196-201 ◽  
Author(s):  
Jin-Fang Shr ◽  
Benjamin P. Thompson ◽  
Jeffrey S. Russell ◽  
Bin Ran ◽  
H. Ping Tserng
Keyword(s):  
Low Cost ◽  
Road User ◽  
User Cost ◽  
Time Curve ◽  
Highway Projects ◽  
The Road ◽  
State Highway ◽  
Florida Department ◽  
The Cost ◽  
State Highway Agencies

An increasing number of state highway agencies (SHAs) are using A (cost) + B (time cost) bidding ( A + B bidding) for highway construction. The A + B bidding concept is designed to shorten the total contract time by allowing each contractor to bid the number of days in which the work can be accomplished, in addition to the traditional cost bid. The SHA is then presented with the problem of determining a reasonable range of contract time submitted by the bidders. Most SHAs do not currently restrict the range of B. However, several problems may arise from an unrestricted range of B. First, if no minimum is set for B, a bidder may inflate the cost bid and submit an unreasonably low B, using the excess cost bid to cover the disincentives charged for exceeding the time bid. Second, if no maximum is set for B, then a bidder with a high B and a low-cost bid may be awarded the job and make an unreasonable amount of money from incentive payments. This study develops a quantified model of the price-time bidding contract. A construction cost-versus-time curve is developed from Florida Department of Transportation (DOT) data. The contractor’s price-versus-time curve is then combined with the road-user cost to determine the optimum lower limit to be set on B. Finally, several projects completed by the Florida DOT will be used to illustrate this model.

Report on design of modules for the stochastic traffic simulation

2021 ◽  
Author(s):  
Christian Siebke ◽  
◽  
Maximilian Bäumler ◽  
Madlen Ringhand ◽  
Marcus Mai ◽  
...  
Keyword(s):  
Traffic Flow ◽  
Main Part ◽  
Traffic Simulation ◽  
Cognitive Structure ◽  
Flow Simulation ◽  
Road User ◽  
The Road ◽  
Traffic Flow Simulation ◽  
Cognitive Behaviour ◽  
Traffic Simulations

As part of the AutoDrive project, OpenPASS is used to develop a cognitive-stochastic traffic flow simulation for urban intersection scenarios described in deliverable D1.14. The deliverable D4.20 is about the design of the modules for the stochastic traffic simulation. This initially includes an examination of the existing traffic simulations described in chapter 2. Subsequently, the underlying tasks of the driver when crossing an intersection are explained. The main part contains the design of the cognitive structure of the road user (chapter 4.2) and the development of the cognitive behaviour modules (chapter 4.3).

Durability design of composite bridges with given life in seasonal freezing region

2021 ◽  
Author(s):  
Xuefei Shi ◽  
Qi Xu
Keyword(s):  
Service Life ◽  
Life Cycle Cost ◽  
Mechanical Performance ◽  
Design Method ◽  
Protective Layer ◽  
Highway Bridges ◽  
Seasonal Freezing ◽  
Durability Design ◽  
Composite Bridges ◽  
Design Requirements

<p>Steel-concrete composite bridges are currently widely used in highway bridges in China. To reduce durability problems in seasonal freezing region, a design method with given service life is used. The service life is given on the basis of the environment condition and design requirements; then the structural design and safety analysis are carried out, and the durability design and analysis of the structural components are conducted. With the consideration of the mechanical performance, construction convenience and life-cycle cost, the structural scheme for bridges using twin-I girders, cross beams and precast full-width deck is recommended. Weather resistant steel is recommended to be used in nonmarine seasonal freezing regions with stabilization treatment, waterproof and drainage design, local anti-corrosion coating. Finally, a design process considering material, protective layer thickness and construction control is proposed to improve concrete deck durability.</p>

scholarly journals State Aid Rules and Public Financing of Infrastructure. The Case of Autostrada Wielkopolska S.A.

2020 ◽  
Vol 10 (1) ◽  
pp. 77-96
Author(s):  
Paulina Kubera
Keyword(s):  
Public Expenditure ◽  
State Aid ◽  
Public Financing ◽  
The Road ◽  
Playing Field ◽  
Toll Road ◽  
Legal Provisions ◽  
Concession Contract ◽  
The Eu ◽  
Made In

Abstract The operation of a toll road typically involves an economic activity for which State aid rules apply. However, if the construction and operation of the road infrastructure is bundled and they are tendered out together, they usually fall outside the State aid regime. The reason for it lies in the fact that the use of competitive procurement procedures aim to increase the efficiency of public expenditure and to ensure a level playing field for private operators to compete for public contracts. Nevertheless, based on the European Commission’s decisional practice, it transpires that an economic advantage for a concession holder cannot be ruled out automatically, in particular when there are amendments made to the original agreement. On the example of the Autostrada Wielkopolska S.A. case, critical State aid issues are discussed, among others, the application of State aid rules to public financing of infrastructure, the amendments made to a concession contract in the light of the risk assignment problem, as well as the existence of State aid in the form of overcompensation for a concession holder. The considerations are carried out on the canvas of a concrete case; however, they are enriched by the analysis of relevant legal provisions as well as conclusions from the EU courts and the European Commission decisions made in similar cases.

scholarly journals ROAD SAFETY CAMPAIGNS TO REDUCE TRAFFIC ACCIDENTS FOR YOUNG ROAD USERS

ICCD ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 601-606
Author(s):  
Widodo Budi Dermawan ◽  
Dewi Nusraningrum
Keyword(s):  
School Environment ◽  
Road Safety ◽  
Traffic Accident ◽  
Traffic Accidents ◽  
Road Traffic ◽  
School Administrators ◽  
Road User ◽  
The Road ◽  
Road Users ◽  
Accident Data

Every year we lose many young road users in road traffic accidents. Based on traffic accident data issued by the Indonesian National Police in 2017, the number of casualties was highest in the age group 15-19, with 3,496 minor injuries, 400 seriously injured and 535 deaths. This condition is very alarming considering that student as the nation's next generation lose their future due to the accidents. This figure does not include other traffic violations, not having a driver license, not wearing a helmet, driving opposite the direction, those given ticket and verbal reprimand. To reduce traffic accident for young road user, road safety campaigns were organized in many schools in Jakarta. This activity aims to socialize the road safety program to increase road safety awareness among young road users/students including the dissemination of Law No. 22 of 2009 concerning Road Traffic and Transportation. Another purpose of this program is to accompany school administrators to set up a School Safe Zone (ZoSS), a location on particular roads in the school environment that are time-based speed zone to set the speed of the vehicle. The purpose of this paper is to promote the road safety campaigns strategies by considering various campaign tools.

scholarly journals KAJIAN KINERJA PERSIMPANGAN TIDAK BERSINYAL (STUDI KASUS : PERSIMPANGAN TIGA GADUT, JALAN RAYA INDARUNG – BANDAR BUAT, KOTA PADANG)

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Eko Prayitno ◽  
Veronika Veronika
Keyword(s):  
Traffic Flow ◽  
Environmental Data ◽  
Degree Of Saturation ◽  
Road User ◽  
Total Delay ◽  
The Road ◽  
Traffic Conditions ◽  
Road Capacity ◽  
Side Friction Factor ◽  
Side Friction

The highway is one of the infrastructure for the smooth traffic. One part of the road that are considered necessary to be analyzed and evaluated is an intersection. Three Gadut intersection is non signalized intersection. The traffic flow is quite dense, and lack of discipline of road user factors competing space to pass the crossing, resulting in congestion is very influential on traffic conditions at peak hours in the morning, afternoon and evening. Prior to conducting the survey, the first to do is survey the condition of the intersection that includes geometric characteristics and traffic volume. From the analysis of environmental data, side friction factor to the junction of three Gadut is the criteria being. Rated capacity (C) the smallest is 3706.3 smp/hour, the degree of saturation of 1.1 smp/hour. This value is over the limit permitted values manually indonesian road capacity of 0.8 to 0.9 (1.1> 0.9), it is concluded that the traffic flow is the crossroads of three Gadut saturated traffic flow. The queue probability value between 128.8% - 157.4% with a total delay largest average 11.57 seconds/smp. It is concluded that the chances of a queue at the intersection of three Gadut very large, so it could cause congestion.

scholarly journals Exploring the Informal Communication of Driver-to-Driver on Roads: A Case Study of Durban City, South Africa.

2021 ◽  
Vol 67 (4) ◽  
pp. 1-8
Author(s):  
Jacob Adedayo Adedeji ◽  
Xoliswa Feikie
Keyword(s):  
South African ◽  
Traffic Safety ◽  
Road Traffic ◽  
Structured Interview ◽  
Road User ◽  
Novice Drivers ◽  
The Road ◽  
Road Users ◽  
Hand Signal ◽  
On The Road

Road traffic fatality is rated as one of the ten causes of death in the world and with various preventive measures on a global level, this prediction is only placed on flat terrain and didn’t reduce. Nevertheless, road users’ communication is an essential key to traffic safety. This communication, be it formal or informal between the road users is an important factor for smooth traffic flow and safety. Communication language on roads can be categorized into; formal device-based signal (formal signal), formal hand signal (formal signal), informal device-based signal (informal signal), and informal gesture-based signal (everyday signal). However, if the intent of the message conveys is not properly understood by the other road user, mistakes and errors may set in. Overall, the formal signal is based on explicit learning which occurs during the driving training and the license testing process and the informal, implicit learning occur during the actual driving process on the road unintentionally. Furthermore, since the informal signal is not a prerequisite to driving or taught in driving schools, novice drivers are clueless and thus, might have contributed to errors and mistakes which leads to traffic fatalities. Therefore, this study seeks to document the informal means of communication between drivers on South African roads. Consequently, a qualitative semi-structured interview questionnaire would be used in the collection of informal signals, which were predominantly used on South African roads from driving instructors and thereafter, a focus group of passengers’ car, commercial and truck drivers will be used to validate the availability and their understanding of these informal signals using a Likert-type scale for the confidence level. In conclusion, the information gathered from this study will help improve road safety and understanding of road users especially drivers on the necessity of communication and possible adaptation for other developing countries.

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