Energy-Dissipation Mechanisms and Seismic Design Recommendation of Eccentrically Braced Steel Frames

2011 ◽  
Vol 71-78 ◽  
pp. 3662-3665
Author(s):  
Bao Cheng Zhao ◽  
Qiang Gu
Keyword(s):  
Plastic Deformation ◽  
Energy Dissipation ◽  
Seismic Design ◽  
Steel Frames ◽  
Shell Element ◽  
Elastic Stiffness ◽  
Collapse Mechanism ◽  
Finite Element Program ◽  
Earthquake Load ◽  
Element Program

Eccentrically braced steel frames are a lateral load-resisting system which apply high intensity area and it can provide the high elastic stiffness that met higher steel building drift requirement. This paper first provides an introduction of Forces in links and Energy dissipation mechanisms of eccentrically braced steel frames. In that Eccentrically braced steel frames will collapse after the link beams go into plastic deformation under earthquake load, A new analytical model which include shell element apply to link beams with large deformation and plastic deformation and beams element apply to other parts of structure is presented in this paper for analyzing eccentrically braced steel frames energy-dissipation behavior and collapse mechanism. Computer program is complied. After this paper applies nonlinear finite element program to analyze the behaviors of eccentrically braced steel frames under cyclic load, the seismic design recommendations of eccentrically brace are presented.

Friction Force and Stresses Analysis for Contact of Assembled Details

2006 ◽  
Vol 113 ◽  
pp. 334-338
Author(s):  
Z. Dreija ◽  
O. Liniņš ◽  
Fr. Sudnieks ◽  
N. Mozga
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Plastic Deformation ◽  
Friction Force ◽  
Sliding Friction ◽  
Friction Model ◽  
Contact Interface ◽  
Finite Element Program ◽  
Elastic Plastic ◽  
Element Program

The present work deals with the computation of surface stresses and deformation in the presence of friction. The evaluation of the elastic-plastic contact is analyzed revealing three distinct stages that range from fully elastic through elastic-plastic to fully plastic contact interface. Several factors of sliding friction model are discussed: surface roughness, mechanical properties and contact load and areas that have strong effect on the friction force. The critical interference that marks the transition from elastic to elastic- plastic and plastic deformation is found out and its connection with plasticity index. A finite element program for determination contact analysis of the assembled details and due to details of deformation that arose a normal and tangencial stress is used.

Nonlinear Response and Failure of Steel Elbows Under In-Plane Bending and Pressure

2003 ◽  
Vol 125 (4) ◽  
pp. 393-402 ◽  
Author(s):  
S. A. Karamanos ◽  
E. Giakoumatos ◽  
A. M. Gresnigt
Keyword(s):  
Finite Element ◽  
Local Buckling ◽  
Shell Element ◽  
General Purpose ◽  
Element Analysis ◽  
Cross Sectional ◽  
Finite Element Program ◽  
Special Cases ◽  
Element Program ◽  
Plane Bending

The paper investigates the response of elbows under in-plane bending and pressure, through nonlinear finite element tools, supported by experimental results from real-scale tests. The finite element analysis is mainly based on a nonlinear three-node “tube element,” capable of describing elbow deformation in a rigorous manner, considering geometric and material nonlinearities. Furthermore, a nonlinear shell element from a general-purpose finite element program is employed in some special cases. Numerical results are compared with experimental data from steel elbow specimens. The comparison allows the investigation of important issues regarding deformation and ultimate capacity of elbows, with emphasis on relatively thin-walled elbows. The results demonstrate the effects of pressure and the influence of straight pipe segments. Finally, using the numerical tools, failure of elbows under bending moments is examined (cross-sectional flattening or local buckling), and reference to experimental observations is made.

Computer Aided Modeling of Deep-Drawing

2007 ◽  
Vol 344 ◽  
pp. 341-348
Author(s):  
Mehmet Ali Pişkin ◽  
Bilgin Kaftanoğlu
Keyword(s):  
Finite Element ◽  
Deep Drawing ◽  
Plastic Material ◽  
Yield Criterion ◽  
Shell Element ◽  
Material Model ◽  
Industrial Applications ◽  
Finite Element Program ◽  
Element Program ◽  
Von Mises

Deep-drawing operations are performed widely in industrial applications. It is very important for efficiency to achieve parts with no defects. In this work, a finite element method is developed to simulate deep-drawing operation including wrinkling. A four nodded five degree of freedom shell element is formulated. Isotropic elasto-plastic material model with Von Mises yield criterion is used. By using this shell element, the developed code can predict the bending behavior of workpiece besides membrane behavior. Simulations are carried out with four different element sizes. The thickness strain and nodal displacement values obtained are compared with results of a commercial finite element program and results of previously conducted experiments.

Time-History Analysis of the High-Rise Building Structure Based on ANSYS

2011 ◽  
Vol 71-78 ◽  
pp. 2836-2839
Author(s):  
Hui Xia Xiong ◽  
Chang Yong Wang
Keyword(s):  
Structural Design ◽  
Time History ◽  
Time History Analysis ◽  
Building Structure ◽  
Finite Element Program ◽  
High Rise ◽  
High Rise Building ◽  
History Analysis ◽  
Earthquake Load ◽  
Element Program

The dynamic property of a high-rise building structure and time-history analysis under earthquake were analyzed by using the finite element program ANSYS. A modal analysis of the tower was conducted and the first 20 frequencies and modal shapes were obtained. The displacements and inner force under the earthquake were calculated. The result showed that the structural stiffness was enough to sustain earthquake load; and the stiffness distributed equally. These results can provide reliable basis for structural design.

scholarly journals Steel Frames Exposed to Severe Ground Motions: Use of Viscous Dampers and Buckling Restrained Braces to Dissipate Earthquake Induced Energy

2021 ◽  
Author(s):  
Osman Hansu ◽  
Esra Mete Guneyisi
Keyword(s):  
Steel Frames ◽  
Structural Response ◽  
Time History ◽  
Base Shear ◽  
Viscous Dampers ◽  
Finite Element Program ◽  
Buckling Restrained Braces ◽  
Interstorey Drift ◽  
Element Program ◽  
Nonlinear Time History

This study addresses an alternative use of viscous dampers (VDs) associated with buckling restrained braces (BRBs) as the innovative seismic protection devices. For this, 4, 8 and 12 storey steel frames were designed with 6.5 m equal span length and 4 m storey height. Thereafter, the VDs and BRBs were placed over the height of each frame considering three different configurations. The structures were modeled using SAP2000 finite element program and evaluated by the nonlinear time history analyses subjected to the six natural accelerograms (1976 Gazlı, 1978 Tabas, 1987 Superstition Hills, 1992 Cape Mendocino, 1994 Northridge and 1999 Chi-Chi). The structural response of the structures with and without VDs and BRBs were studied in terms of variation in the displacement, interstorey drift, absolute acceleration, maximum base shear, time history of roof displacement. The results clearly indicated that the application of VDs and BRBs had remarkable improvement in the earthquake performance of the case study frames by reducing the local/global deformations in the main structural systems and satisfied the serviceability.

Improvement of Continuity Between Industrial Software and Research One by Object-Oriented Finite Element Formulation of Shell and Plate Element

2019 ◽  
pp. 24-56
Author(s):  
Sabah Moussaoui ◽  
Mourad Belgasmia
Keyword(s):  
Finite Element ◽  
Object Oriented ◽  
Shell Element ◽  
Object Oriented Programming ◽  
Plate Element ◽  
Finite Element Program ◽  
Isotropic Shell ◽  
Plate And Shell ◽  
Element Program ◽  
Industrial Software

This chapter shows, through the example of the addition of a plate and shell element to freeware FEM-object, an object-oriented (C++) finite element program, how object-oriented approaches, as opposed to procedural approaches, make finite element codes more compact, more modular, and versatile but mainly more easily expandable, in order to improve the continuity and the compatibility between software of research and industrial software. The fundamental traits of object-oriented programming are first briefly reviewed, and it is shown how such an approach simplifies the coding process. Then, the isotropic shell and orthotropic plate formulations used are given and the discretized equations developed. Finally, the necessary additions to the FEM-object code are reviewed. Numerical examples using the newly created plate membrane plate element are shown.

Structural Analysis for Ethylene Oxide Reactor

2007 ◽  
Author(s):  
Hee-Suk Woo ◽  
Yun-Seok Hong ◽  
Young-Soon Lim ◽  
Jung-Yean Park ◽  
Hee-Jae Ahn ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Structural Integrity ◽  
Operating Conditions ◽  
Heat Transfer Analysis ◽  
Structural Safety ◽  
Dead Weight ◽  
Finite Element Program ◽  
Earthquake Load ◽  
Element Program ◽  
Load Conditions

The structural safety of the Ethylene Oxide (EO) reactor of an ethylene glycol plant project should be verified by computational analysis. The heat transfer analysis has been performed using the finite volume method program, Fluent and the stress analysis has been performed using the finite element program, ANSYS. The applied loads are dead weight, internal pressure, nozzle load, earthquake load, wind load and thermal load. The analysis results for the main load conditions are presented. In addition, abnormal operating conditions such as runaway, pre-ignition and post-ignition are analyzed. The structural integrity of an EO reactor is investigated in accordance with the ASME Boiler and Pressure Vessel Code, Section VIII, Div. 2. It is concluded that the design of the EO reactor complies with the design criteria for all design load conditions.

scholarly journals Experimental study on the seismic behavior of concentrically braced steel frames with extended end-plate bolted connections

2020 ◽  
Vol 103 (3) ◽  
pp. 003685042095228
Author(s):  
Yang Rongqian ◽  
Zhou Xuejun
Keyword(s):  
Plastic Deformation ◽  
Energy Dissipation ◽  
Bearing Capacity ◽  
Steel Frames ◽  
Steel Frame ◽  
Utilization Efficiency ◽  
Advantages And Disadvantages ◽  
Concentrically Braced ◽  
Energy Dissipation Capacity ◽  
Resistance Performance

The prefabricated semi-rigid concentrically braced steel frame has always been the main form of residential steel structures, much work so far has focused on the earthquake-resistance performance of such structures. However, little attention has been devoted to systematic model testing, further effort is still required to explore the structural performance with experimental studies. Two semi-rigid concentrically braced steel frames were designed and tested to failure under reversed low-cyclic loading. The hysteretic curves, bearing capacity, energy dissipation capacity, ductility and stiffness degradation performance were studied in detail. Then the performance was compared to analyze the advantages and disadvantages of the two frames. The tests showed that the plastic deformation and damage were primarily concentrated at the braces, and the columns and semi-rigid connections exhibited hardly any plastic deformation. The specimens went through the elastic stage, elastic-plastic stage and failure stage during the tests. The results indicated the specimen with chevron braces has better seismic performance. The structure presents the characteristic of ductile failure on the whole. The steel frame and braces of the specimens cooperatively perform together so that the structure has two seismic fortification lines. The structure with chevron braces possesses an excellent bearing capacity, a high lateral stiffness, a reliable lateral-resistance performance and a strong energy dissipation capacity. In contrast, because of the premature fracture of the cross joints, the structure with X-shaped braces has a lower material utilization efficiency, which leads to a dramatic decrease in the bearing capacity and stiffness, as well as low ductility and a poor energy dissipation capacity.

Experimental and Numerical Study on Seismic Performance of Flat Columns under Bilateral Cyclic Loading

2013 ◽  
Vol 302 ◽  
pp. 347-354
Author(s):  
Ze Feng Ma ◽  
Zhou Dao Lu ◽  
Jiang Tao Yu ◽  
Zi Hong Cai
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Numerical Study ◽  
Width Ratio ◽  
Finite Element Program ◽  
Static Tests ◽  
Element Program ◽  
Energy Dissipation Capacity ◽  
Shape Curve

In order to research seismic behavior of flat columns under bilateral cyclic loading with different angles, pseudo-static tests are conducted, which includes three 1:2 scaled flat columns. The height-width ratio of the column section is 5. And the loading directions are 00, 250 and 450 respectively. By observation of the test phenomenon and analysis of the data, the seismic performance of the columns including stiffness, skeleton curves, hysteresis curves, ductility and energy dissipation are obtained. Moreover, finite element program ANSYS is employed to simulate the bearing capacity of specimens. The research shows that with the loading angles increasing from 0 to 45, the strength of the flat column decreased gradually, while the ductility and energy dissipation capacity increase, and the failure mode changed from compression-shear to compression-bending. P-Δ effect becomes evident at lager values of loading angle. The compression-shearing curve of flat column complies with a heart-shape curve.

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