Vertical Load Path Under Static and Dynamic Loads in Concrete Crosstie and Fastening Systems

2014 ◽  
Author(s):  
Kartik R. Manda ◽  
Marcus Dersch ◽  
Ryan Kernes ◽  
Riley J. Edwards ◽  
David A. Lange
Keyword(s):  
Vertical Direction ◽  
Dynamic Loads ◽  
Vertical Load ◽  
Load Path ◽  
Test Program ◽  
Static Loads ◽  
Extensive Field ◽  
Interface Characteristics ◽  
Static And Dynamic Loads ◽  
Insight Into

An improved understanding of the vertical load path is necessary for improving the design methodology for concrete crossties and fastening systems. This study focuses on how the stiffness, geometry, and interface characteristics of system components affect the flow of forces in the vertical direction. An extensive field test program was undertaken to measure various forces, strains, displacements and rail seat pressures. A Track Loading Vehicle (TLV) was used to apply well-calibrated static loads. The TLV at slow speeds and moving freight and passenger consists at higher speeds were used to apply dynamic loads. Part of the analysis includes comparison of the static loads and the observed dynamic loads as a result of the trains passing over the test section at different speeds. This comparison helps define a dynamic loading factor that is needed for guiding design of the system. This study also focuses on understanding how the stiffness of the components in the system affects the flow of forces in the vertical direction. The study identifies that the stiffness of the support (ballast) underneath the crossties is crucial in determining the flow of forces. The advances made by this study provide insight into the loading demands on each component in the system, and will lead to improvements in design.

The Mechanical Properties Comparative Analysis for Socked and Non-Socketed Composite Pile

2014 ◽  
Vol 1061-1062 ◽  
pp. 748-750
Author(s):  
Heng Chen ◽  
Ke Sheng Ma
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
Seismic Performance ◽  
Dynamic Loads ◽  
Vertical Load ◽  
Interlayer Thickness ◽  
Static Loads ◽  
Soil Stress ◽  
Composite Pile ◽  
Static And Dynamic Loads

For socked and non-socketed piles in the different mechanical behavior under static and dynamic loads, the paper use ABAQUS to model, simulate the pile , the soil interlayer thickness between the bottom of the pile and bedrock are 2m, 4m under vertical load and Earthquake, cushion cap, pile and pile soil stress situation found non-socketed piles when the soil interlayer thickness within a certain range, the composite pile small subside under dynamic, static loads, the non-socketed piles can better take advantage of the pile soil has a good seismic performance in the earthquake.

A Developed Toolkit for Analysis of Large Deflections of Beams

2009 ◽  
Author(s):  
Shahnam Navaee
Keyword(s):  
Virtual Instrument ◽  
Numerical Scheme ◽  
Front Panel ◽  
Dynamic Loads ◽  
Large Deflections ◽  
Flexible Beams ◽  
Allowable Stresses ◽  
Executable File ◽  
Static And Dynamic Loads ◽  
Insight Into

In the presented paper, an interesting and unconventional approach for analysis of non-linear bending of a flexible cantilever beam subjected to an inclined end-load is explored utilizing LabVIEW. The numerical scheme employed in the LabVIEW Virtual Instrument (VI) developed in this study utilizes elliptic integrals to generate the theoretical solution. The procedure employed in the study is capable of determining not only the primary deflected shape, but also other possible stable configurations of the beam subjected to an end-load. In earlier research done by the author, it was proven that depending upon the specific beam and loading parameters, multiple deflected configurations are possible for flexible beams subjected to loads. Utilizing the front panel of the developed VI, the user can conveniently control the beam and load parameters and interactively generate the internal shear and moment reactions along the length of the beam and the deflected configurations. Provisions are included in the VI to ensure that the maximum normal and shearing stresses exerted on the beam do not exceed the beam’s allowable stresses. A visual indicator placed on the front panel of the created VI alerts the user if this occurs. Virtual Instrument developed in this study will be prepared in a form to allow the users to be able to run the toolkit remotely over the web for any desired input. A special executable version of this VI will also be created to further enhance the accessibility of the toolkit. This executable file can run on any computer with or without LabVIEW installed. The developed toolkit will allow the students, educators, and researchers to create a variety of “what if” scenarios and gain a better insight into predicting the behavior of beams undergoing large deflections. The sample solutions included in this paper will clearly demonstrate the utility and efficiency of the developed toolkit. The procedure developed in this study can further be extended to obtain the solutions for other cases, such as deflections of beams with initial curvature, and beam subjected to other static and dynamic loads.

scholarly journals An Assessment of the Performance of the Amasya Bayezid II Mosque Under Static and Dynamic Loads

2021 ◽  
Vol 11 (1) ◽  
pp. 53-60
Author(s):  
B. Ş. Şeker ◽  
Gizem Büyükgüner
Keyword(s):  
Ottoman Empire ◽  
Dynamic Loads ◽  
Cultural Center ◽  
Static Loads ◽  
North Central ◽  
The North ◽  
Bearing Unit ◽  
Dynamic Analyses ◽  
Static And Dynamic Loads ◽  
The City

Abstract Located in the north-central part of Anatolia, Amasya has hosted many civilizations throughout history. The city existed as a major commercial and cultural center during the Byzantine, Seljuk, and Ottoman eras. Many monumental works were gifted by these civilizations to the city, including the Bayezid II Mosque, which was constructed during the Ottoman Empire. In this study, the Bayezid II Mosque was assessed under static and dynamic loads. Results from the static analyses revealed the sections where stress and deformations occurred under static loads. Iron braces were used in these parts to reduce these impacts. Results from the dynamic analyses indicated that the sections of the structure where stresses and deformations have large values are the domes, the minarets, narthex, and the bottom and top points of the columns in the main load-bearing unit. The data derived from this study can serve to guide future restoration efforts.

Gauging of Concrete Crossties to Investigate Load Path in Laboratory and Field Testing

2014 ◽  
Author(s):  
Sihang Wei ◽  
Daniel A. Kuchma ◽  
J. Riley Edwards ◽  
Marcus S. Dersch ◽  
Ryan G. Kernes
Keyword(s):  
High Speed ◽  
Field Experiments ◽  
Vertical Direction ◽  
Field Testing ◽  
Longitudinal Axis ◽  
Load Cell ◽  
Strain Gauges ◽  
Vertical Load ◽  
Load Path ◽  
Transportation Research

To meet the demands of increasing freight axle loads and cumulative gross tonnages, as well as high-speed passenger rail development in North America, the performance and service life of concrete railway crossties must be improved. As a part of a study funded by the Federal Railroad Administration (FRA) aimed at improving concrete crossties and fastening systems, laboratory experimentation was performed at the Advanced Transportation Research Engineering Laboratory by researchers from the University of Illinois at Urbana-Champaign. This paper focuses on the behavior of concrete cross-ties as well as characterizing and quantifying the loads transmitted from the wheel/rail interface through the fastening system to the tie in the vertical direction. Concrete embedment strain gauges were cast below rail seat to create a “load cell” to measure the rail seat vertical load. Laboratory instrumentation efforts have been done to calibrate this vertical “load cell”. To understand the rail seat load and load path in the field, experimentation was performed at the Transportation Technology Center (TTC) in Pueblo, both static loading which were applied by TTC’s Track Loading Vehicle and dynamic loading due to real wheel-rail interaction were discussed. Concrete cross-tie bending behavior was also investigated through the use of strain gauges applied in the longitudinal axis of the crossties in both laboratory and field experiments. Results from these findings will be utilized to aid in the recommendations for the mechanistic design of various components within the fastening system.

New Research on the Use of Hardening Plastics for Aircraft Construction

1940 ◽  
Vol 44 (349) ◽  
pp. 44-73
Author(s):  
Wilhelm Kuech
Keyword(s):  
Strength Properties ◽  
Dynamic Loads ◽  
Absorbed Energy ◽  
Good Strength ◽  
Different Temperatures ◽  
Bonding Properties ◽  
Static And Dynamic Loads ◽  
Impact Bending ◽  
New Research ◽  
Laminated Materials

Laminated materials incorporating plastics seem to be especially well suited lor highly stressed aircraft components, by reason of their good strength properties. Paper, fabric and wood veneers treated with plastics on a phenolic basis were tested with regard to their strength, especially in bending, shear, absorbed energy in impact bending, notching strength and in their resistance against moisture. Further, the behaviour of compressed plastics was studied at different temperatures under static and dynamic loads. A part of the research was extended to pure phenol resin and to thermoplastics based on methacrylate and polyvinylchloride. The bonding properties of laminated compressed plastics were established. Concluding, some experiments relating to the practical manufacture of aeroplane components are communicated.

scholarly journals Preliminary investigation of use of flexible folding wing tips for static and dynamic load alleviation

2016 ◽  
Vol 121 (1235) ◽  
pp. 73-94 ◽  
Author(s):  
A. Castrichini ◽  
V. Hodigere Siddaramaiah ◽  
D.E. Calderon ◽  
J.E. Cooper ◽  
T. Wilson ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Preliminary Investigation ◽  
Aircraft Design ◽  
Dynamic Loads ◽  
Induced Drag ◽  
Aeroelastic Model ◽  
Static And Dynamic Loads ◽  
Folding Wing ◽  
Wing Tips ◽  
Wing Tip

ABSTRACTA recent consideration in aircraft design is the use of folding wing-tips with the aim of enabling higher aspect ratio aircraft with less induced drag while also meeting airport gate limitations. This study investigates the effect of exploiting folding wing-tips in flight as a device to reduce both static and dynamic loads. A representative civil jet aircraft aeroelastic model was used to explore the effect of introducing a wing-tip device, connected to the wings with an elastic hinge, on the load behaviour. For the dynamic cases, vertical discrete gusts and continuous turbulence were considered. The effects of hinge orientation, stiffness, damping and wing-tip weight on the static and dynamic response were investigated. It was found that significant reductions in both the static and dynamic loads were possible. For the case considered, a 25% increase in span using folding wing-tips resulted in almost no increase in loads.

The Specific Characteristics of Shock and Blast Impacts on Construction Sites

2021 ◽  
pp. 81-88
Author(s):  
A.A. Komarov ◽  
Keyword(s):  
Dynamic Load ◽  
Static Load ◽  
Dynamic Loads ◽  
Potential Hazard ◽  
Construction Sites ◽  
Static Loads ◽  
Equivalent Static Loads ◽  
Plane Crash ◽  
Nuclear Plants ◽  
The Impact

The practices of hazardous and unique facilities’ construction imply that specific attention is paid to the issues of safety. Threats associated with crash impacts caused by moving cars or planes are considered. To ensure safety of these construction sites it is required to know the potential dynamic loads and their destructive capacity. This article considers the methodology of reducing dynamic loads associated with impacts caused by moving collapsing solids and blast loads to equivalent static loads. It is demonstrated that practically used methods of reduction of dynamic loads to static loads are based in schematization only of the positive phase of a dynamic load in a triangle forms are not always correct and true. The historical roots of this approach which is not correct nowadays are shown; such approach considered a detonation explosion as a source of dynamic load, including TNT and even a nuclear weapon. Application of the existing practices of reduction of dynamic load to static load for accidental explosions in the atmosphere that occur in deflagration mode with a significant vacuumization phase may cause crucial distortion of predicted loads for the construction sites. This circumstance may become a matter of specific importance at calculations of potential hazard of impacts and explosions in unique units — for instance, in the nuclear plants. The article considers a situation with a plane crash, the building structure load parameters generated at the impact caused by a plane impact and the following deflagration explosion of fuel vapors are determined.

Manufacturing of Bellows Compensator by Pulsed-Magnetic Field Pressure

2022 ◽  
Vol 1049 ◽  
pp. 108-113
Author(s):  
Nikolay Kurlaev ◽  
Ahmed Soliman Mohamed Sherif ◽  
Nikolay Ryngach
Keyword(s):  
Relative Elongation ◽  
Operating Time ◽  
Dynamic Loads ◽  
Pulse Field ◽  
Magnetic Pulse ◽  
System Operation ◽  
Effective Protection ◽  
Expansion Joints ◽  
Static And Dynamic Loads ◽  
Tubular Billet

Bellows are a cylindrical shell with a corrugated part, widely used in aviation engineering as a movable sealing element to balance pressure and temperature differences, which ensure continuous and accurate system operation. The use of bellows expansion joints provides reliable and effective protection of pipelines from static and dynamic loads arising from deformations and vibration. Welded-edge bellows are a popular choice for regulating and controlling fuel supply in aircraft devices. The ability of the compensator to perceive deformations is determined by its assigned operating time, which describes how many cycles, and with what amplitude, the bellows compensator perceives without damage. A method for stamping bellows from tubular billets by using magnetic-pulse field in rigid dies, including sequential shaping of corrugations by distributing the internal magnetic pressure with axial movement of the free end of a tubular billet, characterized in that the material of the tubular billet for shaping corrugations is selected in accordance with its relative elongation.

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