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.

ANALYSIS AND DESIGN OF MULTI-STOREY STEEL STRUCTURES WITH IRRIGATION TO TORQUE ACCORDING TO 2018 EARTHQUAKE REGULATIONS

2021 ◽  
Vol 0 (15) ◽  
pp. 0-0
Author(s):  
Fahım Ahmad NOWBAHARI ◽  
Elif AĞCAKOCA
Keyword(s):  
Steel Structure ◽  
Steel Structures ◽  
Seismic Load ◽  
Finite Element Program ◽  
Analysis And Design ◽  
Earthquake Resistant Structures ◽  
Cross Member ◽  
Element Program ◽  
The Cross ◽  
Design Earthquake

When observing the consequences of earthquakes, it is accepted that earthquakes are one of the most dangerous natural disasters in the world. Therefore, special engineering methods are used to explore and analyze the effects of earthquakes on structures and to design earthquake resistant structures accordingly. In applying these methods, it is important to investigate the irregularities in the carrier system correctly. There are six irregularities in the Turkish Building Earthquake Code (TBDY-2018), one of the most important of which is A1 Torsional Irregularity [TBDY 2018]. In this article, considering TBDY 2018, the dynamic behaviour of structures with different ratios of torsional irregularity in multi-storey steel structures is examined. In a 10-storey steel structure with the same purpose and size, four type models were produced using the central inverted V cross member and changing the cross positions. The Equivalent Seismic Load Method is used in the analysis. Structural analyzes were performed with the "ETABS" finite element program. As a result of these studies; The displacements obtained from the structural analysis of 4 models with different torsional irregularity coefficients due to the cross member placement in various places in 4 buildings with the same dimensions were calculated by the Equivalent Seismic Load method.

Analysis of Impeller Vibration in Radial Compressors

1986 ◽  
Author(s):  
J. Wachter
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Modal Analysis ◽  
Dynamic Behaviour ◽  
Modal Parameters ◽  
Centrifugal Impeller ◽  
Experimental Investigations ◽  
Finite Element Program ◽  
Element Program ◽  
Detailed Application

The prediction of the dynamic behaviour of the impellers is of considerable importance in the design of turbomachines. The excitation possibilities of the radial impellers by the forces or imposed displacements are various and an appreciation of the life of radial impellers is strongly bounded to an accurate dynamic analysis. Therefore, it is necessary to analyze them in order to improve the geometry or modify the design. In order to better understand and explain the dynamic behaviour of impellers, a series of impeller models with various numbers of blades of radial or tangential extention have been examined. Because of complexity of analytical analysis shown in earlier works, the eigenfrequencies and modes of the impellers were evaluated using a Finite Element program. Interferometric holography served as a means to visualize the dynamic behaviour of the impellers. An experimental modal analysis was used to identify the modal parameters. A detailed application of these methods to an actual centrifugal impeller was also reported along with theoretical and experimental investigations on the impeller models.

Soil–steel structure design by the Ontario Code: Part 2. Structural considerations

1981 ◽  
Vol 8 (3) ◽  
pp. 331-341 ◽  
Author(s):  
G. Abdel-Sayed ◽  
Baidar Bakht
Keyword(s):  
Steel Structure ◽  
Steel Structures ◽  
Empirical Method ◽  
Structure Design ◽  
Live Load ◽  
Finite Element Program ◽  
Worked Example ◽  
Metallic Shell ◽  
Element Program ◽  
Load Effects

The paper presents provisions of the Ontario Bridge Design Code for the structural design of the metallic shell of soil–steel structures, and also discusses the development background of these provisions. A simplified method of determining live load effects in the metallic shell is presented. The method is based on results of a well-tested plane strain finite element program. An empirical method for determining live load effects, which is based on tests of full-size structures, is also given. A worked example is given to illustrate the usage of the design provisions.

scholarly journals Design Analysis of Overhead Crane for Maintenance Workshop

2018 ◽  
Vol 207 ◽  
pp. 02003
Author(s):  
Siva Sitthipong ◽  
Chaiyoot Meengam ◽  
Suppachai Chainarong ◽  
Prawit Towatana
Keyword(s):  
Finite Element ◽  
Steel Structure ◽  
Design Analysis ◽  
Overhead Crane ◽  
Functional Requirements ◽  
Finite Element Program ◽  
Fishing Boat ◽  
Element Program ◽  
Reinforced Steel ◽  
Beam Bridge

This research aimed to study the design of the overhead crane of a small fishing boat maintenance factory according to the building and functional requirements of the project based on the ASME B30.2-2005 Standard. The results of the study showed that the design of the runway with steel structure BS: 5950: 2000 grade s460 provided vertical and horizontal deflection values of 4.96 and 16.62 respectively that did not exceed the allowed deflection. It is strong enough for use in construction when the stresses on the beam bridge were analysed by the finite element program compared with the strength of the reinforced steel providing a safety value of 1.83.

Influence of Loading on Mode Localization in Periodic Structures

1995 ◽  
Vol 48 (11S) ◽  
pp. S132-S137 ◽  
Author(s):  
Reyolando M. L. R. F. Brasil ◽  
Carlos E. N. Mazzilli
Keyword(s):  
Small Parameter ◽  
Periodic Structures ◽  
Computer Code ◽  
Vibration Modes ◽  
Finite Element Program ◽  
Mode Localization ◽  
Element Program ◽  
The Masses ◽  
Lumped Masses ◽  
Two Degree Of Freedom

This paper addresses the problem of the presence of a slightly disordered loading in otherwise ordered periodic structures as an element to trigger the phenomenon of vibration mode localization due to its effect in their stiffness. The sample structures are basically cantilever columns supporting the loads due to large lumped masses in their top which may vary according to a disorder related small parameter. They are connected by very flexible springs. A first series of results deals with a two-degree-of-freedom model where localization is achieved due to loading disorder. The frequencies and displacements show very sharp and nonlinear variation when the small parameter changes slightly around its zero value. The results for this simple model compare well with those of a finite element program developed by the authors. For a more complex example, another model of a rank of six columns is analyzed by the same computer code. A pseudo-random variation of the masses is considered and the resulting vibration modes are compared to those of the ordered structure, which are global in nature and present a sinusoidal spatial distribution. Again, due to mode localization, motions in the perturbed structure are found to be restricted largely to one of the masses.

An Efficient Time Domain Code for Strength and Fatigue Analysis of Steel Catenary Risers

2015 ◽  
Author(s):  
Djoni E. Sidarta ◽  
Xiaoning Jing ◽  
Kostas F. Lambrakos ◽  
Roger W. Burke ◽  
William C. Webster
Keyword(s):  
Time Series ◽  
Finite Element ◽  
Dynamic Analysis ◽  
Time Domain ◽  
Fatigue Analysis ◽  
Strength Analysis ◽  
Analysis Software ◽  
Finite Element Program ◽  
Element Program ◽  
Steel Catenary Risers

Steel Catenary Risers (SCRs) are commonly used in the offshore industry. Strength and fatigue performance of SCRs due to waves, currents and vessel motions is typically calculated using time domain dynamic analysis. Strength analysis may involve a large number of load cases for different environments, riser conditions and vessel configurations. Fatigue analysis may involve computation of riser response for hundreds of fatigue sea-states. It is very important for project schedule and cost that the analysis software used is both accurate and computer efficient. This paper presents RodDyn as an alternative time domain analysis tool for SCR strength and fatigue analysis. RodDyn is a finite element program for dynamic analysis of single-pipe risers. Several publications on this program are available in the literature. The results of dynamic analysis of an SCR for strength and fatigue from RodDyn are compared against the results from ABAQUS. ABAQUS is a general finite element program that has been widely used in the offshore exploration and production industry and has been considered one of the standard finite element programs. Riser dynamic analysis uses time series of vessel motions due to metocean environments at an oblique angle to the plane of the SCR. Von Mises stress per API RP 2RD, strength checks per API STD 2RD and fatigue damage along the riser are presented for both RodDyn and ABAQUS. Time series of effective tension and bending moments at selected locations on the riser are also compared. The main advantage of using RodDyn for riser analysis is the speed of computation. This paper shows that RodDyn can deliver significant gains in computational speed compared to standard riser analysis software programs without sacrificing accuracy of the computed results.

Mechanical Property Study of Corroded Steel Beams Strengthened with Prestressed CFRP Sheets

2012 ◽  
Vol 594-597 ◽  
pp. 955-958
Author(s):  
Jun Hua Huo ◽  
Bo Pang
Keyword(s):  
Mechanical Properties ◽  
Bearing Capacity ◽  
Steel Corrosion ◽  
Steel Structure ◽  
Calculation Model ◽  
Steel Beams ◽  
Finite Element Program ◽  
Cfrp Sheets ◽  
Element Program ◽  
Prestressed Cfrp Sheets

Steel structure, which has higher bearing capacity, smaller sectional dimension, convenient construction and economical investment, can be abroad used in engineering. However, due to a lot of reasons, the gradual expansion and convergence of the micro-defects lead to the macro deterioration of the mechanical properties of materials. By experimental research, theoretical analysis and computer simulation, the mechanical properties of the corroded steel beams strengthened with (prestressed) CFRP sheets were studied. According to the mechanical characteristics of corrosive steel beams and corrosive composite steel-concrete beams strengthened with prestressed CFRP sheets. By using ABAQUS finite element program, the calculation model of prestressed CFRP sheets strengthened corrosion steel beams and corrosion steel-concrete composite beams is established, and the working mechanism is studied. The calculation results show that: the bearing capacity of strengthened beams increase with the increasing of the initial prestress and CFRP sheets thickness, and decrease with the increase of steel corrosion degrees.

scholarly journals Silent Boundary Scheme and Analysis of Existing Methods of providing Silent Boundary

2020 ◽  
Vol 12 (01) ◽  
Author(s):  
Jyoti Agarwal ◽  
Ankush Chaudhary
Keyword(s):  
Finite Element ◽  
Kinetic Energy ◽  
Dynamic Analysis ◽  
Strain Energy ◽  
Vertical Displacement ◽  
Boundary Effects ◽  
Simple Problem ◽  
Two Dimensional ◽  
Finite Element Program ◽  
Element Program

For dynamic analysis, it is required to provide viscous boundaries in PLAXIS to reduce the boundary effects and to prevent the reflection of waves from boundaries. So, a study has been carried out to compare the various methods of providing silent boundaries and to see the effectiveness of viscous boundaries used in PLAXIS. In this work, three methods of providing silent boundaries, which are viscous boundaries, local damping, and extended boundary, are analyzed using a 2D finite element program in FORTRAN by considering the simple problem of a two-dimensional vertical bar. Parameters, such as, normal stress at the bottom, vertical displacement at the top, potential energy, kinetic energy, strain energy, and total energy of bar are determined with and without using the above three methods of providing silent boundaries. Results are compared using graphs. It was observed that standard viscous boundaries are not much effective for static analysis but most effective for dynamic analysis.

Analysis of Dynamic Performance of Air-Cooled Condenser Structure System

2012 ◽  
Vol 170-173 ◽  
pp. 2675-2680
Author(s):  
Ying Sun ◽  
Yan Hong
Keyword(s):  
Finite Element ◽  
Time Domain ◽  
Power Plants ◽  
Vibration Mode ◽  
Dynamic Performance ◽  
Cycle Frequency ◽  
Finite Element Program ◽  
Structure System ◽  
Element Program

In situ measurements on two power plants designed air-cooled condenser structure were described in this paper. Operating condition was divided into three types to test the structure system, and then obtaining the data of time-domain waveform and spectrum analysis in each condition. Cycle, frequency and vibration mode of the structure system were obtained by analyzing the data. Meanwhile, the structure was theoretically calculated using finite element program, gaining the cycle, frequency and vibration mode of the structure system. It was concluded that basic vibration mode of the structure system was space torsional vibration by comparison between theoretical values and measured values.

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