Buckling of Double Bellows Expansion Joints under Internal Pressure

1964 ◽  
Vol 6 (3) ◽  
pp. 270-277 ◽  
Author(s):  
D. E. Newland
Keyword(s):  
Internal Pressure ◽  
Axial Load ◽  
Expansion Joint ◽  
Expansion Joints ◽  
Supporting Structure ◽  
Universal Expansion ◽  
Critical Buckling Pressure

Corrugated bellows expansion joints may buckle under internal pressure in the same way as an elastic strut may buckle under an axial load. This paper is concerned with the analysis of this phenomenon for the ‘universal expansion joint’ which incorporates two bellows joined by a length of rigid pipe. The principal conclusion is that, by providing a correctly designed supporting structure, the critical buckling pressure can be increased to up to four times its value for the same system with no supports.

Toroidal-Shell Expansion Joints

1953 ◽  
Vol 20 (4) ◽  
pp. 497-503
Author(s):  
N. C. Dahl
Keyword(s):  
Axial Load ◽  
Toroidal Shell ◽  
Center Line ◽  
Axial Deformation ◽  
Expansion Joint ◽  
Cylindrical Pipe ◽  
Expansion Joints

Abstract The problem considered in this paper is shown in Fig. 1; a thin toroidal shell of center-line radius a and torus mid-surface radius b is slit at its inner edge and welded to relatively stiff cylindrical pipe sections to form an expansion joint. Stresses and axial deformation under the axial load P are desired.

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.

Behaviour of H-piles supporting an integral abutment bridge

2014 ◽  
Vol 51 (7) ◽  
pp. 713-734 ◽  
Author(s):  
Shelley A. Huntley ◽  
Arun J. Valsangkar
Keyword(s):  
Axial Load ◽  
Integral Abutment ◽  
Integral Abutment Bridges ◽  
Expansion Joints ◽  
Thermal Bridge ◽  
Double Curvature ◽  
Abutment Bridges ◽  
Integral Abutments ◽  
Integral Abutment Bridge ◽  
Lateral Displacements

Integral abutment bridges accommodate thermal superstructure movements through flexible foundations rather than expansion joints. While these structures are a common alternative to conventional design, the literature on measured field stresses in piles supporting integral abutments appears to be quite limited. Therefore, field data from strain gauges installed on the abutment foundation piles of a 76 m long; two-span integral abutment bridge are the focus of this paper. Axial load, weak- and strong-axis bending moments of the foundation piles, as well as abutment movement and backfill response, are presented and discussed. Results indicate that the abutment foundation piles are bending in double curvature about the weak axis, as a result of thermal bridge movements, and bending also about the strong axis due to tilting of the abutments. A simple subgrade modulus approach is used to show its applicability in predicting behaviour under lateral loading. In the past, much emphasis has been placed on the lateral displacements of piles and less on variations of axial load. In this paper, a new hypothesis, which offers insight into the mechanisms behind the observed thermal variations in axial load, is proposed and assessed. The data from the field monitoring are also compared with the limited data reported in the literature.

scholarly journals Influence of the Acoustic Cover of the Modular Expansion Joint on the Acoustic Climate in the Bridge Structure Surroundings

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2842
Author(s):  
Janusz Bohatkiewicz ◽  
Michał Jukowski ◽  
Maciej Hałucha ◽  
Marcin Dębiński
Keyword(s):  
Sound Level ◽  
Structural Elements ◽  
Expansion Joint ◽  
Expansion Joints ◽  
The Road ◽  
Sound Levels ◽  
Road Surfaces ◽  
Before And After ◽  
Bridge Structures

The noise generated at the interface between the wheels of vehicles and the road surface is well recognized in the literature worldwide. Many publications describe the phenomenon of reducing this kind of impact by silent road surfaces. A specific type of this noise is the sound generated by vehicles passing over the expansion joints of bridge structures. Due to the impulsive nature of this sound, it is very onerous for people living in the close vicinity of bridge structures. The passage of vehicles over expansion joints causes the formation of vibrations that are transmitted to the structural elements of bridge structures, which may cause the formation of the material sounds (especially arduous in the case of bridges with steel elements). An attempt to reduce this impact was made by making a prototype acoustic cover of the expansion joint on the selected bridge. The paper presents the results of research on the “in situ” acoustic effectiveness of this cover. Additionally, the noise was modelled in the object surroundings before and after the cover’s application. The acoustic efficiency of the cover in the whole measured frequency range was 5.3 dBA. In the narrower frequency bands (1/3 octave bands), larger sound level reductions were observed. The maximum sound levels measured under the tested dilatation were less than 10.0 dBA lower than the maximum sound levels measured under the reference dilatation.

Automatic Assembly and Key Technologies of Expansion Joints

2011 ◽  
Vol 109 ◽  
pp. 420-423
Author(s):  
Yan Kai Fang
Keyword(s):  
Parametric Modeling ◽  
Modeling Method ◽  
Cycle Life ◽  
Secondary Development ◽  
Automatic Assembly ◽  
Expansion Joint ◽  
Expansion Joints ◽  
Key Technologies ◽  
Graphics Software

Expansion joints are non-standard devices whose shape and parameters could vary with temperature, pressure, displacement and cycle life, so it's drawing work is very burdensome. Expansion joint industry is badly in need a set of accurate, reliable and stong practical professional graphics software. Therefore this paper carried out targeted secondary development of the software on the basis of digestion and absorption of SolidWorks2010 so as to meet the urgent needs of expansion joints industry. The structure of most parts of bellows expansion joints is not complex, and their geometry are relatively simple and fixed, so it is very suitable for parametric modeling method.

Satisfying Piping Stress and Flexibility Requirements With the Implementation of Expansion Joints: Techno-Economical Optimization

2012 ◽  
Author(s):  
Misa Jocic
Keyword(s):  
Traditional Method ◽  
Technical Specification ◽  
Manufacturing Companies ◽  
Expansion Joint ◽  
Expansion Joints ◽  
The Past ◽  
Pipe Routing ◽  
Piping Systems ◽  
Economical Optimization ◽  
Design And Construction

There have been various attempts to deal with the optimization of solutions which involve expansion joints in piping systems where sufficient flexibility can’t be found using suitable pipe routing. The difficulty of piping designs which involve expansion joints is that they rely upon two engineering expertises: Pipe Flexibility and Stress Analysis on one side and Expansion Joint Design and Construction on the other. Arguably distinctively different, they have been looked upon as totally detached engineering disciplines and it is rarely that companies have two of these experts residing under the same roof. Pipe Stress Engineers basically relied on support form Expansion Joint Experts on “as required basis” and called upon their knowledge only when needed. Thus, we have the situation where knowledge related to the design and construction of expansion joints sits with expansion joints manufacturing companies, which are totally separate and often remote entities in the piping design process. Even so, the ever present demand for techno-economical optimizations, points us to the following observations. The “Traditional method”, where Pipe Stress Engineer defines on his own the requirements for expansion joints and describes them in the technical specification for purchasing is, or should be, a theme of the past. This approach may be used only as a first attempt in search for the solution, but given that it never heads in the direction of achieving optimal techno-economical results, needs to be upgraded with additional steps.

Analysis of CCR Expansion Joints

2019 ◽  
Author(s):  
Sanjay Kaul ◽  
Rajpalsinh Gohil ◽  
Parul Bisharia ◽  
Apoorva Roy
Keyword(s):  
Hydrogen Atmosphere ◽  
Heat Of Reaction ◽  
Expansion Joint ◽  
Catalytic Reforming ◽  
Element Analysis ◽  
Expansion Joints ◽  
Thermal Movement ◽  
Temperature And Pressure ◽  
Design Calculations ◽  
Movement Test

Abstract The CCR (Continuous Catalytic Reforming) Platforming™ process is Honeywell UOP’s technology to convert low octane naphtha to high octane fuel or petrochemical feedstock such as aromatics. It is accomplished in a hydrogen atmosphere at elevated temperature and pressure across a platinum containing catalyst. The process flow is routed through heaters, blowers and coolers between reactors to maintain the heat of reaction. This article captures the procedure of selecting a suitable expansion joint for absorbing thermal movement between two important pieces of CCR equipment — the regeneration cooler and regeneration blower. It shows the design calculations of a universal hinged expansion joint operating at 0.14 MPa and 593°C in a pipe of 762mm diameter. The joint contains 5 single-ply INCOLOY 800H bellows with unreinforced convolutions. Design calculations of the expansion joint have been carried out using formulae prescribed in the Expansion Joints Manufacturers Association (EJMA) standard. Since it is difficult to quantify stresses using a movement test, the EJMA calculations have been verified against finite element analysis results of the bellows.

The Critical Buckling Pressure of Arteries

2007 ◽  
Author(s):  
Cesar A. Fierro ◽  
Kurtis Johnson ◽  
Hai-Chao Han
Keyword(s):  
Internal Pressure ◽  
Critical Pressure ◽  
Axial Strain ◽  
Critical Buckling Pressure

Artery stability is essential to normal arterial functions. This study examined the critical internal pressure at which arteries buckle. The critical pressure was found to be strongly related to the axial strain in the arteries.

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