Elastic-Plastic Analysis and Research of Large Profiled Structure under Rare Strong Earthquakes Based on FNA Method

2013 ◽  
Vol 838-841 ◽  
pp. 1556-1561
Author(s):  
Na Xie ◽  
Gan Wang ◽  
Jian Zhong Zhao ◽  
Zhi Ming Zhao ◽  
Hui Xin Zhou ◽  
...  
Keyword(s):  
Seismic Design ◽  
Nonlinear Behavior ◽  
Steel Structure ◽  
Steel Structures ◽  
Strong Earthquakes ◽  
Design Goal ◽  
Buckling Behavior ◽  
Plastic Analysis ◽  
Post Buckling ◽  
Internal Forces

In rare strong earthquakes, the steel structure may occur the nonlinear behavior and redistribution of internal forces. In order to understand the post-buckling behavior of steel structures and determine the weak areas of the structure, and then determine whether the structure under strong earthquakes meets the seismic design goal or not, this paper adopts the FNA method to analyze the response of large profiled steel structure under severe earthquakes. Finally, we draw some general conclusions which are valuable for designing the large profiled structure.

scholarly journals Effects of Surrounding Earth on Shell During the Construction of Flexible Bridge Structures

2019 ◽  
Vol 41 (2) ◽  
pp. 67-73
Author(s):  
Czesław Machelski
Keyword(s):  
Steel Structure ◽  
Steel Structures ◽  
Static Condition ◽  
Steel Bridge ◽  
Interfacial Interactions ◽  
Soil Medium ◽  
Bridge Structures ◽  
Internal Forces ◽  
Bearing Loads ◽  
Corrugated Plates

AbstractA characteristic feature of soil-steel structures is that, unlike in typical bridges, the backfill and the carriageway pavement with its foundation play a major role in bearing loads. In the soil-steel structure model, one can distinguish two structural subsystems: the shell made of corrugated plates and the backfill with the pavement layers. The interactions between the subsystems are modelled as interfacial interactions, that is, forces normal and tangent to the surface of the shell. This is a static condition of the consistency of mutual interactions between the surrounding earth and the shell, considering that slip can arise at the interface between the subsystems. This paper presents an algorithm for determining the internal forces in the shell on the basis of the unit strains in the corrugated plates, and subsequently, the interfacial interactions. The effects of loads arising during the construction of a soil-steel bridge when, for example, construction machines drive over the structure, are taken into account in the analysis of the internal forces in the shell and in the surrounding earth. During construction, the forces in the shell are usually many times greater than the ones generated by service loads. Thus, the analytical results presented in this paper provide the basis for predicting the behaviour of the soil medium under operational loads.

Post-Buckling of Piezoelectric Thin Plates

2015 ◽  
Vol 15 (07) ◽  
pp. 1540020 ◽  
Author(s):  
Michael Krommer ◽  
Hans Irschik
Keyword(s):  
Nonlinear Partial Differential Equation ◽  
Nonlinear Behavior ◽  
Dirichlet Boundary Conditions ◽  
Thin Plates ◽  
Governing Equations ◽  
Simply Supported ◽  
Buckling Behavior ◽  
Single Term ◽  
Post Buckling ◽  
Special Case

In the present paper, the geometrically nonlinear behavior of piezoelastic thin plates is studied. First, the governing equations for the electromechanically coupled problem are derived based on the von Karman–Tsien kinematic assumption. Here, the Berger approximation is extended to the coupled piezoelastic problem. The general equations are then reduced to a single nonlinear partial differential equation for the special case of simply supported polygonal edges. The nonlinear equations are approximated by using a problem-oriented Ritz Ansatz in combination with a Galerkin procedure. Based on the resulting equations the buckling and post-buckling behavior of a polygonal simply supported plate is studied in a nondimensional form, where the special geometry of the polygonal plate enters via the eigenvalues of a Helmholtz problem with Dirichlet boundary conditions. Single term as well as multi-term solutions are discussed including the effects of piezoelectric actuation and transverse force loadings upon the solution. Novel results concerning the buckling, snap through and snap buckling behavior are presented.

scholarly journals Seismic analysis method of steel structures connections

2020 ◽  
Vol 17 (2) ◽  
pp. 51-59
Author(s):  
A. I. Garipov ◽  
◽  
P. A. Pyatkin ◽  
Keyword(s):  
Spectral Method ◽  
Seismic Analysis ◽  
Steel Structure ◽  
Steel Structures ◽  
Analysis Method ◽  
Internal Forces

The article presents a technique of calculating steel structures connections taking into consideration the results of seismic analysis of steel structure carried out by linear spectral method. This technique allows reaching the equilibrium of forces and moments applied to the connection, wherein extreme internal forces’ values received correspond to the internal forces’ values obtained according to the currently valid acting construction codes.

FIRE RESISTANCE PERFORMANCE OF CELLULAR STEEL BEAM (CSB) AT ELEVATED TEMPERATURES

2015 ◽  
Vol 76 (9) ◽  
Author(s):  
Fariz Aswan Ahmad Zakwan ◽  
Renga Rao Krishnamoorthy ◽  
Azmi Ibrahim ◽  
Abdul Manaff Ismail
Keyword(s):  
Elevated Temperature ◽  
Large Deformation ◽  
Elevated Temperatures ◽  
Steel Structure ◽  
Steel Structures ◽  
General Purpose ◽  
Steel Beam ◽  
Standard Fire ◽  
British Steel Corporation ◽  
Post Buckling

Cellular steel beam (CSB) is getting more and more popular to be used as the main structural member for steel building structure in the United Kingdom (UK). Despite quite costly to erect and assemble a steel structure member compared to concrete, it has several advantages in terms of lightweight material, higher strength, easy to assemble and aesthetic value. Even though the use of CSB is quite significantly positive, the negative side also needs to be addressed. Any steel structures are prone to fire exposure scenario. The strength of CSB will be significantly decreased when exposed to elevated temperature due to fire. Large deformation from experimental procedure will be clearly seen after the time-temperature curve reach critical stage. Vierendeel bending mechanism and web-post buckling are some of the drawbacks of the CSB at elevated temperature. In this paper, general purpose ABAQUS Finite Element (Version 6.14) on large deformation of protected and unprotected CSB at elevated temperature is proposed. Performance based approach is introduced to validate the numerical analysis with the experimental results from the available Compendium of UK Standard Fire Test Data produced by British Steel Corporation Research Services, Swinden Laboratories, UK.

scholarly journals Methods for conceptual and preliminary seismic design of buildings with steel structure

2019 ◽  
Vol 11 (2) ◽  
Author(s):  
Tiago Ribeiro ◽  
Ana Sousa
Keyword(s):  
Seismic Design ◽  
Steel Structure ◽  
Steel Structures ◽  
Eurocode 8 ◽  
Seismic Action ◽  
The European Union ◽  
Design Standards ◽  
Design Guide ◽  
Current Context ◽  
Earthquake Effects

Throughout the last two decades, seismic design standards evolved to ever more comprehensive and detailed prescriptions, stressing out the need for design methods that deal with earthquake effects not as actions, but as a design philosophy. The Eurocode 8 adoption as national law throughout the European Union countries and informally in many parts of Africa, Asia and Latin America is the pretext for the current study. It aims to provide some guidance to the seismic design of steel structures as well as to the Eurocode 8 implementation by the designers.Some lines on the preliminary design of structural systems were written based on several real cases of structures designed taking into account the seismic action. Such a content is, usually, relevant in any design guide, given its value in enhancing the design technical and economical content. However, it is now of utter significance at the current context as an essential tool to facilitate the safety checking of several code requirements.Some of the Eurocode 8 prescriptions are then decoded, explained and justified based on the supportive bibliography. The information is subsequently ordered as a design guide, where some procedures are proposed to cope with the code interrelated prescriptions and one structural solution is proposed in order to overcome a design challenge while complying with the code.One last but not less relevant addressed issue is the fact that some Eurocode 8 prescriptions may be reviewed, in the eyes of a designer, given its practical outcome. Such issues are identified, explained and some slight code adjustments are suggested.

Identification and Evaluation of Steel Structure after Fire

2013 ◽  
Vol 438-439 ◽  
pp. 530-534
Author(s):  
Lan Yao ◽  
Yu Min Liu ◽  
Yong Zhi Zou ◽  
Qiao Zhi Lu
Keyword(s):  
Empirical Test ◽  
Steel Structure ◽  
Steel Structures ◽  
Building Assessment ◽  
The Future ◽  
Internal Forces ◽  
Class C ◽  
Engineering Projects

After fire, the strength of steel materials and stiffness of artifacts decrease significantly, which cause the redistribution of internal forces and increase the difficulty in testing of materials, identification and evaluation of steel structures after fire. This paper mainly discusses the identification and evaluation of steel structure of one project undertaken a fire by empirical test. It is speculated that the temperature of the fire was more than 850°C, area covered includes 1~4/Q~W axis and 5~6/H~W axis of the factory, after the fire in the safety appraisal building assessment, it is categorized as class C which influences the safety of the whole structure. From the results of this appraisal, suggestions are made which could be regarded as a guide in similar engineering projects in the future.

A Method for Analyzing Elastic Large Deflection Behavior of Perfect and Imperfect Plates With Partially Rotation-Restrained Edges

2011 ◽  
Vol 134 (2) ◽  
Author(s):  
Jeom Kee Paik ◽  
Do Kyun Kim ◽  
Hoseong Lee ◽  
Yong Lae Shim
Keyword(s):  
Large Deflection ◽  
Biaxial Loading ◽  
Torsional Rigidity ◽  
Nonlinear Behavior ◽  
Edge Condition ◽  
Biaxial Compression ◽  
Buckling Behavior ◽  
Deflection Analysis ◽  
Post Buckling ◽  
Loading Ratio

The edge condition of the plating in a continuous stiffened-plate structure is neither simply supported nor clamped because the torsional rigidity of the support members at the plate edges is neither zero nor infinite. In a robust ship structural design, it is necessary to accurately take into account the effect of the edge condition in analyses of plate behavior in terms of buckling and post-buckling behavior. The aim of this study is to develop a new method for analyzing the geometric nonlinear behavior (i.e., elastic large deflection or post-buckling behavior) of plates with partially rotation-restrained edges in association with the torsional rigidity of the support members and under biaxial compression. An analytical method was developed to solve this problem using the nonlinear governing differential equations of plates. The validity of the developed method was confirmed by comparison with nonlinear finite element method solutions with varying values for the torsional rigidity of the support members, plate aspect ratio, and biaxial loading ratio. The developed method was found to give reasonably accurate results for practical design purpose in terms of the large deflection analysis of plates with partially rotation-restrained edges, and it will be useful for the robust design of ship structures in association with buckling and ultimate strength of plates surrounded by support members.

Imperfection Sensitivity of Laminated Cylindrical Shells by Full and Initial Post-Buckling Analyses

Aerospace ◽  
2004 ◽  
Author(s):  
Izhak Sheinman ◽  
Mahmood Jabareen
Keyword(s):  
Structural Engineering ◽  
Cylindrical Shells ◽  
Nonlinear Behavior ◽  
Test Results ◽  
Imperfection Sensitivity ◽  
Buckling Behavior ◽  
Load Carrying ◽  
Post Buckling ◽  
Linear Buckling Analysis ◽  
Laminated Cylindrical Shells

Laminated cylindrical shells are already commonly used in structural engineering, and their buckling and post-buckling behavior is of vital importance in the design of such structures. The validity of linear buckling analysis in this context, has been questioned because of the discrepancy observed between theoretical prediction and test results. The cause of this discrepancy is the fact that the nonlinear behavior of shell-like structures is generally characterized by a limit point rather than by a bifurcation point. For such structures, the load-carrying capacity depends on the level of imperfection (hence the concept “imperfection sensitivity”). The motivation is, therefore, to reduce the sensitivity rather than preventing the imperfection. For that purpose insight into the post-buckling state is called for.

scholarly journals Post-buckling behavior estimation of rigidly supported cylindrical composite panels in case shear

2021 ◽  
Vol 2094 (4) ◽  
pp. 042078
Author(s):  
O V Mitrofanov ◽  
M Osman
Keyword(s):  
Linear Problem ◽  
Nonlinear Behavior ◽  
Cylindrical Panel ◽  
Geometrically Nonlinear ◽  
Rigid Support ◽  
Buckling Behavior ◽  
Nonlinear Stress ◽  
Cylindrical Panels ◽  
Post Buckling ◽  
Composite Cylindrical Panel

Abstract We present the solution of the geometrically nonlinear problem of the shear-critical behavior of a thin composite cylindrical panel of small curvature of orthotropic structure. The obtained solution considers the conditions of all-round rigid support. The expression for determining the membrane stresses arising in the supercritical state is given. When considering a linear problem, expressions for determining the critical shear flow are given. A method for determining the nonlinear stress-strain state in the overcritical state for a given thickness and stacking of an orthotropic panel is presented. The obtained solutions can be used in the design of load-bearing cylindrical panels, as well as in the analysis of geometrically nonlinear behavior of defects such as delaminations.

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