Civil and Environmental Engineering Commons^™

Research On School Zone Safety, Aemal Khattak, Yashu Kang

Nebraska Department of Transportation: Research Reports

This research investigated different aspects of school zone safety including the effects of speed differentials on drivers’ speeds in active school zones, the effects of school and surrounding characteristics on drivers’ speeds in active school zones, and the safety benefits and costs associated with active school zones. The research team identified 18 schools in Nebraska for data collection that consisted of drivers’ speed data, school and surrounding characteristics, and 2014-2018 reported crash data. The 18 schools were categorized by the school zone speed limit differentials: 35 to 25 mph, 40 to 25 mph, 30 to 25 mph, and 35 to …

Southern California Regional Transit Training Consortium: Skills Gap & Needs Assessment, Tyler Reeb, Benjamin Olson

Mineta Transportation Institute

The transit sector grows and evolves quickly with the needs of growing, busy cities. With this growth comes a need for more transit workers and more training to ensure workers can best serve their diverse communities. This report contains a transit training needs assessment and gap analysis to identify the most pressing challenges of the evolving transit workforce served by the Southern California Regional Transit Training Consortium (SCRTTC). Most importantly, this report documents and determines SCRTTC priorities to ensure the incumbent and future transit workforce is equipped with the professional and technological skills required to address the transformational trends affecting …

Effective Communication Message Strategy For Enhancing Traffic Safety In Fresno County: The Role Of Time Horizon, Regulatory Focus, And Perceived Personal Control, Samer Sarofim

Mineta Transportation Institute

This research empirically investigated the differential effect of message framing on message recipients’ attitudes and intended behaviors related to pedestrian, cyclist, and motorist traffic safety practices. The framework empirically investigated time horizon (expansive vs. limited) and regulatory focus (prevention vs. promotion) message framing.

The time horizon in the message can make someone either think of the future (expansive) or the present (limited). For example, an expansive time horizon message communicates that life is long and directs the focus on the future. On the contrary, a limited time horizon message communicates that life is short and directs the focus on the …

A Multi-Objective Optimization Model To Minimize The Gap In Accessibility To Multi-Use Paths While Maximizing The Economic Efficiency Of Active Transportation Investments For Fresno, California, Chih-Hao Wang

Mineta Transportation Institute

This research examines the accessibility to multi-use paths in a variety of neighborhoods in Fresno, California. This study aims to develop a multi-objective optimization modeling framework to be used by decision makers in transportation and policy to maximize the total accessibility to multi-use paths across the city while minimizing the gap between low- and high- accessibility neighborhoods by an optimal allocation of active transportation. Researchers calculate accessibility to multi-use paths by measuring the total length of multi-use paths (walkway and bikeway) a resident could reach from their own Census block group with a 30-minute cycling ride. The study employs a …

The Fresno State Transportation Challenge, Christian Wandeler, Steven Hart

Mineta Transportation Institute

The goal of the “Fresno State Transportation Challenge” was outreach to schools and community engagement, to provide K-8 students opportunities to learn about transportation and transportation-related careers, and to practice 21st century skills by solving a transportation-related issue in their community. Through the pedagogical frameworks of action civics and eduScrum (a method to facilitate self-managed teamwork with a visual board), teachers and students worked on solving issues in their community. They learned design thinking to identify issues and develop solutions while using eduScrum to manage their work. University students from transportation engineering visited the schools regularly to support the K-8 …

Assessing Complete Street Strategies Using Microscopic Traffic Simulation Models, Bernice Liu, Alireza Shams, Jonathan Howard, Serena Alexander, Alex Hughes, Anurag Pande

Mineta Transportation Institute

Authors of this research developed a traffic simulation model for the downtown San Jose network and evaluated five different street redesign and travel demand combinations. This model aids understanding of network-wide effects of changes in street design for local and regional agencies who are interested in implementing complete streets and/or one-way to two-way conversion. The base network may be altered to model and evaluate other complete streets (e.g., road diet) and tactical urbanism (e.g., farmer’s market on city streets on certain days of the week) scenarios. The 3-dimensional animated videos for each scenario are also created to be used for …

Suitability Of Fusing Vehicle Probe Data And Vessel Data To Contextualize The Multimodal Interaction Impacts On Corridor Mobility – A New Orleans Case Study, Kirk Zeringue

LSU New Orleans Theses and Dissertations

Using New Orleans as a case study, this thesis explores the conflation of vehicle probe data with various vessel datasets to characterize the interactions between container vessels and motor vehicles as it relates to interstate congestion in a port city. The case study investigates the impact of container vessel presence/size, fluctuations in container volumes, and container on barge services on roadway congestion. The exploration relies on comparing different conditions using cumulative distribution functions and the Innovative Trend Analysis. The results showed that fusing vehicle and vessel data is achievable and appropriate, but temporal and data completeness issues can effect results. …

About Computer Simulation Of The Structure Of Cellular Concrete With A Tasked Heat Conductivity, Anvar Ishanovich Adilkhodjayev, S.S. Shaumarov, E.V. Shchipacheva

Journal of Tashkent Institute of Railway Engineers

This article presents the developed mathematical model of the structure of cellular concrete and its computer implementation in the form of a computational software package that allows you to determine pore sizes and characteristics of inter-pore walls, corresponding to the required thermal conductivity of the material. The stages of computer simulation of the macrostructure of cellular concrete are also given.

Calculation Of Hanging Shells Complex Geometry, Sayidmahsud Razzakov, Gennady Fridman, Rasul Khuzhakulov

Journal of Tashkent Institute of Railway Engineers

A method for calculating large-span, spatial hanging shells is presented. A resolving system of equations is obtained for determining the stress-strain state of the hanging shells, the support contour, bearing and stabilizing cables

Plastometry Application For Control Of Portland Cement Consumer Properties, Aleksandr Petrovich Nikolaev, Elena Vladimirovna Kondrashchenko, Valery Іvanovich Kondrashchenko

Journal of Tashkent Institute of Railway Engineers

It was shown that cements of the same strength grade substantially differ at initial dynamics of their interaction with water and structure-forming capacity din the course of stiffening. The necessity was substantiated for current control of Portland cement consumer properties in operation with cement from the same vendor. It was proved that the amount of added plasticizer for obtaining plastisized concrete on the basis of cements of the same strength grade from different vendors may differ several times. The efficiency was demonstrated of input control of Portland cement structure- forming capacity at plants manufacturing concrete and ferroconcrete products, using modified …

Effectiveness Of Seismic Base Isolation In Reinforced Concrete Multi-Storey Buildings, Ravshanbek Abdujabborovich Mavlonov, Sohiba Ergashboevna Numanova

Journal of Tashkent Institute of Railway Engineers

The dynamic reaction of a building to earthquake ground motion is the most critical reason for earthquake actuated damage to structures. The basic concept in seismic isolation is to protect the structure from the damaging effects of an earthquake by introducing a flexible support isolating the building from the shaking ground. Seismic isolation consists of essentially the installation of mechanisms such as isolators which decouple the structure from base. In the present study, the seismic response of the reinforced concrete building, base isolated by lead rubber bearings (LRBs) is compared with the seismic response of the same structure which does …

Method Of Calendar Planning Of Construction Of The Complex At The Early Stage Of Design, M Mirakhmedov, M. Rasulmukhamedov, L.S. Yusupova

Journal of Tashkent Institute of Railway Engineers

The construction schedule developed in the construction organization project does not meet the requirements of the reserve for construction, is not based on the choice of construction and technological schemes and the method of construction organization, therefore, it is not sufficiently reliable, the evidence base stored in the project archive is not confirmed by calculations and Therefore, it cannot be subjected to reliable examination. To eliminate this drawback, a technique is proposed that takes into account the lack of information. The methodology is based on the graphanalytic model of the flow organization of the construction of the complex, which allows …

Adhesion Strength Of Modified Plaster Solutions For Restoration Of Rchitectural Monuments Of Bukhara, M.M. Vaxitov, A.A. Tulaganov, I.I. Tojiev

Journal of Tashkent Institute of Railway Engineers

In this work, the strength of historical mortars of brickwork of the Ismail Somoni mausoleum, the monument of architecture of the Kalyan minaret, the building of the Abdulazizkhan madrasah and the mausoleum of Abdukholik Gizhduvani were determined, and the compressive, tensile, bending and adhesion strengths of the developed modified gypsum mortars for restoration of the above architectural monuments were studied. It is shown that the adhesion strengths of modified gypsum mortars also meet the requirements of KMK 2-01-03-96.

Formation Of A Calculation Model, Study Of Stress-Strain State And Vibrations Of Composite Shell Constructions From Composite Materials, A Abdusattarov, Z.Z. Ergashev, F.E. Abdukadirov

Journal of Tashkent Institute of Railway Engineers

The article gives geometric and physical relationships for shell and ring elements. At the same time, it is assumed that the physical properties of the material of the shell element are described by equations of a viscoelastic medium, taking into account the influence of damage accumulation. Using an approximate method, namely, the “freeze” procedure, a canonical system of equations is obtained - in the form of first-order differential equations with complex coefficients. To solve boundary value problems, the Godunov matrix sweep method is used.

Research Deplanacion Cross-Section, Related To Them Size Under Torsion Fluctuation, Muradov Rustam Muradov, Abduvakhidov Mutakhkhirkhon Abduvakhidov

Journal of Tashkent Institute of Railway Engineers

In this work, the problem of torsional vibrations of rotating working bodies in the form of shafts is studied in case of violation of the assumption of flat sections under torsional strains associated with the peculiarities of torsion deformation of relatively short bodies. During torsional deformation caused by torsional vibrations, the initially rectilinear generators of the cylindrical surfaces of the shaft turn into screw curves of equal length. This causes the longitudinal displacements of their points and, as a result, the appearance of two types of deplanation of its cross sections. The first type of deplanation is associated with the …

Technology For Preparing A Fiber Filler From Rice Straw And Analysis Of Its Interaction With A Modified Gypsum Matrix, Anvar Ishanovich Adilkhodjayev, B.G. Igamberdiev

Journal of Tashkent Institute of Railway Engineers

The article presents research data on a composite material based on rice straw and construction gypsum. An overview of a method for preparing rice straw to increase the dispersion-reinforcing effect of the fiber filler is given. The results of the study of the synergistic effect of the “FremNanogis” modifying additive on the formation of the structure are presented.

Calculation Of Operational Suitability And Reliability Of Structures, Nodira Ziyayevna Saatova, Abdurakhman Asimovich Ishankhodjaev

Journal of Tashkent Institute of Railway Engineers

With the acquisition of independence of our Republic in the system of transport communications, great importance was attached to the qualitative improvement of the design, construction, and operation of aboveground structures. Many tasks have been performed to increase the reliability and strength analysis of these bridges. Along with these, improving methods for calculating the resource of artificial structures in the system of transport communications are required. The Strategy for the Further Development of the Republic of Uzbekistan, including the following tasks: "... implementation of targeted programs for the development and modernization of road transport, engineering, communication, and social infrastructures, ...". …

Estimation Of The Influence Of Cold Bridges On The Heat-Shielding Properties Of The External Walls Of Residential Buildings, Elena Vladimirovna Shchipacheva, Rakhmatullo Pirmatov, Makhina Turdalieva

Journal of Tashkent Institute of Railway Engineers

Most of the existing multi-apartment residential buildings in Uzbekistan have external enclose structures with thermal performance that do not meet modern requirements. This is due to the design features of encloses in seismic areas of construction, necessarily including monolithic elements - anti-seismic belts, cores, frame elements and stiffeners. These elements, providing strength, rigidity and stability of structures, are at the same time powerful heat-conducting inclusions in warmer wall masonry materials. The article presents the results of theoretical and experimental studies on the estimation of the influence of cold bridges on the heat-shielding properties of external heat-technical inhomogeneous walls of civil …

About The Influence Of Some Recipe-Technological Factors On The Properties Of Non-Autoclave Gas Concrete, Anvar Ishanovich Adilkhodjayev, S.S. Shaumarov

Journal of Tashkent Institute of Railway Engineers

This article presents the results of experimental studies on the production of cellular concrete with increased strength properties and improved indicators of the coefficient of structural quality. The use of the proposed composition will allow you to dispose of waste concrete and reduce production costs.

Research Of The Possibility Of Using Waste Of Paint And Varnish Materials For Anti-Corrosion Protection Of Metal Parts Of Transport Equipment, Aida Barxanadjyan, Ravshan Hakimov, Botir Ibragimov

Journal of Tashkent Institute of Railway Engineers

This work is devoted to the corrosion protection of metal parts of transport equipment. The purpose of this study is the use of waste paint and varnish materials (PVM) to obtain anti-corrosion coatings of metal parts. PVMwaste is the loss of paints obtained when painting automobiles. The epoxy polyurethane oligomer synthesized by us was used as a binder resin. During the research, the physicochemical properties of the waste were studied the components were selected to obtain anticorrosive mastic. The resulting mastic was tested in laboratory conditions in accordance with the standards for adhesion, chemical resistance, film strength in bending and …

Production Of Building Materials Based On Waste Industry, Uchqun Abdullayevich Gaziyev

Journal of Tashkent Institute of Railway Engineers

The article describes the production technology of building materials based on industrial waste. Innovative technologies in the production of building materials, using industrial waste, are fully consistent with the research carried out at the Department of Technology of Building Materials, Products and Structures of the Tashkent Architectural and Construction Institute under the scientific supervision of the author of this article. Scientific developments in innovative technologies were carried out in several areas in the field of building materials and products. Based on the waste from the Angren coal deposit and local rocks, quartzite and dacitic porphyry, a gravel-like porous aggregate has …

Technology Of Application Of Mechanical Joints Of Reinforcement In The Construction Of Towers Made Of Monolithic Reinforced Concrete, Kadir Karimovich Akhmedov

Journal of Tashkent Institute of Railway Engineers

Today, more than 3,000 skyscrapers have been built in the world, a third of which were built in China (including Hong Kong and Macao). The rest are located in the United States, Japan, the UAE and other countries, and every year more and more countries join the “sky club”. Uzbekistan also seeks to join this club and construction of the first NEST ONE skyscraper in Tashkent has begun. High-grade steel, concrete and a safe elevator are the true creators of the high-rise boom. In particular, reinforced concrete and the development of technologies for working with it contributed to the increase …

Metal Wooden Spatial Rod Construction From Composition Wooden Elements, Narimonjon Sultanbaevich Tursunov, Sobirjon Juraevich Razzakov

Journal of Tashkent Institute of Railway Engineers

Metal wooden spatial core structure, including upper and lower grids, braces, combining the nodes of the upper and lower grids, and vertical strands, characterized in that, in order to ensure redistribution of forces and uniform load of structural elements and giving additional stiffness compressive composite small-sized boards of the upper belt and the lower metal belt with a special tensile nut to give the building a structural lift, are displaced in plan relative to each other by 45 °, while the braces in the nodes of the grids are located mutually perpendicular and in one direction they are made descending, …

Structure Formation Of A Cement Stone With A Zeolite Containing Filler (Natrolite) And A Superplastificator, Anvar Ishanovich Adilkhodjayev, Ilkhom Abdullaevich Kadyrov, Kadyr Saparbaevich Umarov

Journal of Tashkent Institute of Railway Engineers

The article presents the results of studies of the hydration process of the compositions "cement + zeolite-containing rock + superplasticizer" using the methods of IR spectrometry, differential thermal analysis. The scientific and practical significance of the work results for building materials science and the construction industry is to establish the effectiveness of the use of complex additives in the preparation of cement concrete.

State And Prospects Of Production And Operation Of Synthetic Woven Belts (Table) For Load-Handling Devices (Hd) In The Republic Of Uzbekistan, Ibrohim Numanovich Abdullaev, Zhamoldin Dzhalalovich Akhmedov, Bakhodir Kushakovich Rakhmanov, Ruzikhon Toyirzhanovna Zhurabaeva

Journal of Tashkent Institute of Railway Engineers

In the world, the use of synthetic woven tapes (SWT) is increasing in various areas of life, including in construction. In particular, thanks to the development of production of high-strength synthetic fibers in such developed countries as Russia, USA, Germany, progress has been made in the creation and manufacture of heavy-duty lifting slings from STL, and on this basis to improve ergonomics and safety of installers, the safety of transported goods, the reduction of labor input and material on the load capacity.

Investigation Of The Longitudinal Hijacking Force From Friction Braking, Makhamadjan Mirakhmedovich Mirakhmedov, Gali-Askar Rustamovich Khalfin

Journal of Tashkent Institute of Railway Engineers

On the elements of the longitudinal profile, when the train is decelerated from friction, an additional force of theft occurs. By modeling the braking process, the dependence of the driving forces on the braking friction is close to linear. The result of theft also depends on the power of the anti-theft system, namely, the force of pressing the fastening terminal to the rail, the weakness of which can subsequently affect the safety of trains and cause the track to be thrown out.

Method For Evaluating The Residual Resource Of Long Designs, Sergey Vladimirovich Chizhov, Ulugbek Zabixullayevich Shermuxamedov, Sharofat Shavkatovna Kadirova

Journal of Tashkent Institute of Railway Engineers

The article describes a method for calculating the safety of extended structures, in particular tunnels. The probabilistic approach to solving the problem is analyzed using the reliability of the structure with the probability of failure-free operation and assessment of the residual life of the structure. These characteristics make it possible to predict the residual life of the structure within a time value until the design has exhausted its ultimate state. An assessment of the operational reliability of the structure is carried out by measuring and establishing existing structural defects. Based on the data obtained, an analysis was carried out and …

About The Technology Of Making Reinforced Concrete Sleep By Heating Concrete At Low Temperature, Turgunbaev Urinbek Jamolovich, Movluda Umirova

Journal of Tashkent Institute of Railway Engineers

The article discusses the properties of cement stone with the use of complex chemical additives to improve the technology for the production of sleepers from prestressed concrete. With the use of superplasticizer, the volume of intergranular space and, consequently, capillary porosity, which is a determining factor for both strength and frost resistance and corrosion resistance of concrete, are significantly reduced. Also, during thermo-wet processing, at a temperature of 40 ° C, there was no decrease in the strength of cement stone and sufficient strength at the initial stage of the curing period, 36 MPa with the addition of Glenium 27 …

About Properties Of Modified Gypsum Compositions With Slag Filler And Chemical Additive, Jumagul Raximberdievna Turgunbaeva

Journal of Tashkent Institute of Railway Engineers

The article presents the results of experiments to assess the effect of slag filler and chemical additives on the physical properties of the modified gypsum composition. In particular, it was shown that the water demand of building gypsum increases with an increase in the content of metallurgical slag in the composition. With its constant amount, an increase in the proportion of GLENIUM 27S superplasticizer additive does not affect the normal density value of the gypsum dough. This suggests that the presence of a plasticizing effect from the introduction of superplasticizer GLENIUM 27S. In addition, filling gypsum with metallurgical slag with …

Experimental Research Methodology For The Crack Resistance Of Large-Panel Buildings In Seismic Areas, Nigmat Baxramovich Shaumarov, Ulugbek Xakimovich Abdullayev

Journal of Tashkent Institute of Railway Engineers

The experience of the Tashkent, Spitak, Kyrgyz and Kamchatka earthquakes of recent years has led to the conclusion that there is a sufficient good seismic resistance of large-panel buildings with a narrow step of transverse load-bearing walls. One of the distinguishing structural features of buildings is considered to be the overlapping of individual multi-hollow panels with their support on special cantilevered outlets along the lateral surfaces of the transverse walls. Elements of the outer walls were made of expanded clay concrete with a compressive strength of about 200 kg / cm2. All structures were reinforced with flat welded frames made …