scholarly journals Development of Electromagnetic Testing Instrument for Plate Corrosion of Large Steel Structure Based on Variable Frequency Technique

2021 ◽  
Vol 57 (6) ◽  
pp. 1
Keyword(s):  
Steel Structure ◽  
Variable Frequency ◽  
Testing Instrument ◽  
Large Steel ◽  
Electromagnetic Testing

Dynamic Analysis of Large Steel Structure Truss System

2011 ◽  
Vol 101-102 ◽  
pp. 387-391
Author(s):  
Chu Qun Wu ◽  
Fan Wang ◽  
Shao Yong Wang
Keyword(s):  
Dynamic Analysis ◽  
Vibration Mode ◽  
Steel Structure ◽  
Vibration Modes ◽  
Finite Element Program ◽  
Large Steel ◽  
Dynamic Computation ◽  
Modes Of Vibration ◽  
Element Program ◽  
Earthquake Vibration

The deformation of the large steel structure truss system, which was subjected to constant loads, variable loads and wind loads, was calculated by using the 3D3S steel structure analysis program. The periods and the vibration mode from the first to the ninth order of the structure were obtained by the earthquake vibration mode period analysis. The dynamic computation of the structure showed that the period difference of the vibration modes is small. The frequencies and the modes of vibration from the first to the ninth order of the same structure mode were calculated by using the ANSYS finite element program. The frequencies and the modes of vibration from the first to the ninth order of the building were obtained by the dynamic analysis of the structure. The dynamic computation of the structure shows that the frequencies difference of the vibration modes is small. The vibration instability is possible for the structure.

Control System Development Based on Arc-Submerging Welder for Flat Fillet Seams

2012 ◽  
Vol 155-156 ◽  
pp. 1061-1065
Author(s):  
Gang Wang ◽  
Li Na Feng ◽  
Xiao Ming Zhang
Keyword(s):  
Control System ◽  
System Development ◽  
Steel Structure ◽  
Steel Structures ◽  
Construction Site ◽  
Blast Furnaces ◽  
Mechanical Structure ◽  
Large Steel ◽  
Working Principle ◽  
Oil Tanks

Basing on the original mechanical structure of arc-submerging welder for flat fillet seams, this article designs an arc-submerging welder control system for large steel structures flat fillet seams, such as blast furnaces, oil tanks, and so on, and expatiates on the working principle by circuit designing and testing in detail. This control system has been used greatly in DongYing, DaGang and other construction site for large steel structure.

Construction Survey of Main Truss of the National Stadium “Bird's Nest” Project

2012 ◽  
Vol 170-173 ◽  
pp. 2970-2973
Author(s):  
Shu Ying Ma ◽  
Kai Zhang
Keyword(s):  
Steel Structure ◽  
The Core ◽  
Large Steel ◽  
National Stadium

Construction of large steel structure is the key point of the whole National Stadium “Bird's Nest” project, while construction of main truss is the core of the whole steel structure construction. As connection of main trusses will be carried out overhead, the positioning survey work is quite difficult. This paper introduces the construction survey work of main truss.

scholarly journals Portable Generator to Detect Cracks on Large Steel Structures: An Application of Inductive Thermography

2021 ◽  
Vol 40 (3) ◽  
Author(s):  
Paul Dario Toasa Caiza ◽  
Rüdiger Schwendemann ◽  
Paola Calero ◽  
Thomas Ummenhofer
Keyword(s):  
Output Voltage ◽  
Crack Detection ◽  
Eddy Currents ◽  
Lithium Ion ◽  
Steel Structure ◽  
Steel Structures ◽  
Ir Camera ◽  
Square Wave ◽  
Brittle Behavior ◽  
Large Steel

AbstractThe demand of non-destructive methods to detect cracks caused by fatigue or brittle behavior in large steel structures has increased in the last years. Thermography based on electromagnetic induction is a promising method to detect cracks in weld seams and notches. This paper presents a portable experimental setup, which allows to perform in situ crack detection tests on large steel structures. The success of this configuration is based on the use of a highly efficient switched H-Bridge circuit, which can generate a square-wave output voltage with a fundamental frequency up to 100 kHz. Due to the low losses and the low necessary DC-link voltage, the circuit can be supplied by a lithium-ion battery, which allows a small and light setup. The generated square-wave output voltage supplies an air coil resulting in a high frequent triangle current. The induced electromagnetic field caused by the current signal generates eddy currents in the steel structure. Due to an increased current density of the eddy currents in the crack area, there is a measurable temperature increase near the crack. The resulting temperature field is visualized and recorded with an infrared (IR) camera, which shows in real time the occurrence of cracks.

Analysis and Simulation on the Deformation of Large Steel Bridge under Pressure

2014 ◽  
Vol 513-517 ◽  
pp. 2612-2615
Author(s):  
Jin Feng Lu ◽  
Xiao Lang Li
Keyword(s):  
High Pressure ◽  
Natural Frequency ◽  
Steel Structure ◽  
Quality Parameter ◽  
Steel Bridge ◽  
Changing Trends ◽  
Large Steel ◽  
Damping Parameter ◽  
The Relationship ◽  
Over Time

Based on the well-studied bearing equations of large steel structure bridge, this paper calculates the relationship between quality parameter matrix of the bridge and damping parameter, infers changing trends of stiffness bearing deformation matrix over time, and sets the effective threshold to alarm dangerous conditions in deformation. The paper summarizes the natural frequency of different forms of the bridge, and calculates the frame deformation situation caused by horizontal alternating force under high pressure.

The Deformation Analysis and Control of Large Steel Structures Based on Non-Slide Construction Site

2011 ◽  
Vol 255-260 ◽  
pp. 649-653
Author(s):  
Yan Guo ◽  
Qing Zhang ◽  
Xiang Qiang Bai ◽  
Shen Hong Pan
Keyword(s):  
Dimensional Accuracy ◽  
Steel Structure ◽  
Steel Structures ◽  
Deformation Analysis ◽  
Construction Technique ◽  
Deformation Control ◽  
Large Steel ◽  
Temporary Support ◽  
The Common ◽  
And Control

The layered construction technique is the common method of large steel structures in the non-slide construction. In process of the former three-tier construction, the structure is prone to forming large deformation because of great span, large weight of interlayer equipments and other various factors. In this article, to obtain high dimensional accuracy and good deformation control data, the positions of temporary support points of the 3M201 that is a module of large steel structure in a project are optimized successfully with the ANSYS optimization of finite element.

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