The Assembled Structure Analysis of Energy Conservation and Material Saving Unit Sheet Aluminum Curtain Wall

2011 ◽  
Vol 243-249 ◽  
pp. 6165-6168
Author(s):  
Ze Guang Han ◽  
Xin Fang Song ◽  
Rui Qin Hao
Keyword(s):  
Performance Index ◽  
Technical Specification ◽  
Work Conditions ◽  
Main Body ◽  
Structure Model ◽  
Expansion Joint ◽  
Curtain Wall ◽  
Expansion Joints ◽  
Sheet Aluminum ◽  
Material Saving

The joint between all plains in unit sheet aluminum curtain wall which is hanged on main body architecture is plugboard combination. The change of ambient temperature and wind load generates the change of expansion joints, which are the performance index of curtain wall required gas and water tightness, among curtain walls and suspension members. Thus obtained value of expansion joint among curtain walls is very important to guide the curtain wall’s installation. Here, an assemble structure model of curtain wall has firstly been established, the changing law of expansion joints among curtain walls has also been obtained under all kinds of work conditions based on previous model and the ANSYS software’s application. Some better suggestions have been also provided associating the construction technical specification. It can provide future protection for revised this technical specification, and accelerate the scientific normalization of the design in construction curtain wall.

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.

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.

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.

scholarly journals Structural model and dynamic analysis of six-axis Cartesian coordinate robot for sheet metal bending

2019 ◽  
Vol 16 (4) ◽  
pp. 172988141986156
Author(s):  
Fengyu Xu ◽  
Quansheng Jiang ◽  
Lina Rong ◽  
Pengfei Zhou ◽  
Jinlong Hu
Keyword(s):  
Dynamic Analysis ◽  
Sheet Metal ◽  
Laboratory Testing ◽  
Structural Model ◽  
Dynamic Performance ◽  
Work Conditions ◽  
Structure Model ◽  
Sheet Metal Bending ◽  
Cartesian Coordinate ◽  
The Stability

Bending is an important procedure for processing sheet metals, while it is a key link in the realization of automatic processing of sheet metal. To improve the efficiency and accuracy of bending processing, this article proposed a structure model and a prototype of a six-axis Cartesian coordinate robot for sheet metal bending to replace workers completing automatic bending processes. Based on the analysis of overall structure schemes of the robot, kinematic simulation is conducted by using the automatic dynamic analysis of mechanical system (ADAMS). Furthermore, the dynamic performance of the structural model of the robot for sheet metal bending is analysed and design optimization is performed. A prototype of the robot based on the optimal structural model of six-axis Cartesian coordinate robot for sheet metal bending is made. Finally, under the work conditions, the efficiencies and accuracies of sheet metal bending by a worker and the robot are compared and tested. The structural model of six-axis Cartesian coordinate robot for sheet metal bending presented in this article is found to be applicable to sheet metal bending robot and improves the stability of sheet metal bending machine. The laboratory testing and experimental results verified the feasibility of the proposed robot.

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.

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 Problem of Consideration Torsion Emergence in Beams

2018 ◽  
Vol 7 (3.2) ◽  
pp. 141 ◽  
Author(s):  
Sergiy Hudz ◽  
Grygorii Gasii ◽  
Volodymyr Pents
Keyword(s):  
Theoretical Model ◽  
Bearing Capacity ◽  
Work Conditions ◽  
Steel Beams ◽  
New Approach ◽  
Initial Imperfections ◽  
Advantages And Disadvantages ◽  
Internal Forces ◽  
Partially Restrained ◽  
Material Saving

The calculation of the steel unrestrained and partially restrained roof beams with initial imperfections main stages is discussed. Restraining can be done by structures attached to the steel beams, namely, profiled flooring and discrete joints. On the basis of the new approach to the internal forces analysis and the geometric properties specification, the purpose was to find and describe the differences in the beam work as the part of roofing, which distinguishes it from the work conditions of the free supported beam. The features of the beam operation with the joint flexural and torsion are singled out. The need to improve the existing theoretical model for present deficiencies elimination is indicated. The bearing capacity determining methods for the flexible elements stability exposed to bending and bending with torsion are compared. Their advantages and disadvantages are revealed. It is proposed to increase the material saving by applying calculations. At the end of the article, conclusions regarding the consideration of investigated factors are given.  

Expansion Joint Design, Manufacture and Testing for Large Capacity Steam Turbines

2014 ◽  
Vol 592-594 ◽  
pp. 1539-1543
Author(s):  
C.S. Pargaonkar ◽  
Maneesh Batrani
Keyword(s):  
Steam Turbine ◽  
Computational Methods ◽  
Steam Turbines ◽  
Expansion Joint ◽  
Large Capacity ◽  
Expansion Joints ◽  
Joint Design ◽  
Large Size ◽  
Limiting Values ◽  
Insight Into

The rapidly growing trend for higher capacity steam turbines with large steam flows demand the use of long lengths and large size pipes. Thermal expansions of up-to 50mm and pipe diameters up-to 2600mm are required to be dealt with calling for the use of Expansion Joints to control the stresses in both the pipes as well as the end equipment. The bellows in the Expansion Joints used for the steam turbine application are stretched to their limiting values of the stresses in order to make them as flexible as possible with the aim of limiting the pipe and end equipment operational stresses. Three fundamental types of loading are presented to provide insight into the way bellows convolutions are stressed during operation. The optimization of the bellows profile geometry is discussed briefly. A comparison of the resulsts obtainied by proven computational methods as well as by using international EJMA standard is made to highlight the safety built in the well established methods used.

Determination of Gimbal and Hinged Expansion Joints Reaction Moments

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
José Carlos Veiga ◽  
Nelson Kavanagh ◽  
Ana Maria F. Sousa ◽  
Jorivaldo Medeiros ◽  
Jordana Luiza Veiga
Keyword(s):  
Calculation Method ◽  
Joint Movement ◽  
Expansion Joint ◽  
Expansion Joints ◽  
Spring Rate ◽  
Large Size ◽  
Metal Bellows ◽  
Media Pressure

This paper proposes a method to estimate the actual reaction loads in gimbal and hinged metal bellows expansion joints. Friction and some media pressure forces, which are not considered in current Expansion Joint Manufactures Association (EJMA) standard calculations, are added to bellows spring rate to estimate the expansion joint movement reaction moment. The proposed calculation method is based upon pressure and movement tests of large size expansion joints.

Expansion Joint Replacement with Minimal Impacts on the Bridge Structure and on Traffic

2018 ◽  
Author(s):  
Niculin Meng ◽  
Simon Hoffmann
Keyword(s):  
Dynamic Loading ◽  
Joint Replacement ◽  
Transportation Infrastructure ◽  
Bridge Structure ◽  
Structural Components ◽  
Expansion Joint ◽  
Expansion Joints ◽  
Main Structure ◽  
Wide Range ◽  
Replacement Process

Bridge expansion joints are key structural components that are subjected to very demanding dynamic loading. Even though modern expansion joints are being continuously developed and improved, they are generally still much less robust and less durable than the main structure. Therefore, replacement of expansion joints is commonly required in the maintenance of our transportation infrastructure. In carrying out such replacement work, the impacts on traffic and on the bridge’s superstructure should be minimised, for economic and sustainability reasons. This paper presents various expansion joint replacement methods which minimise such impacts, for a wide range of scenarios and movement requirements. The methods described cover single gap joints, sliding finger joints and modular joints – which, where appropriate, retain and use elements of suitably designed existing joints, thus optimising the replacement process in various respects.

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