Buckling Behavior of Through-Plates under Gravity Loads

2011 ◽  
Vol 105-107 ◽  
pp. 2183-2187
Author(s):  
Razieh Samimi ◽  
Seyed Rasoul Mirghaderi
Keyword(s):  
Building Industry ◽  
Load Path ◽  
Hollow Section ◽  
Panel Zone ◽  
Economical Design ◽  
Buckling Behavior ◽  
Bending Capacity ◽  
Pass Through ◽  
The Moment ◽  
Hollow Structural Sections

Due to the development in the construction and building industry in recent years, numerous methods for safer, easier and more economical design of structures have been studied.Because of the high bi-axial bending capacity and high compressive strength of hollow structural sections, these sections are considered as a popular alternative by designers. Supporting the panel zone demands in the columns and occurring the moment hinge at the ends of beam are too available in column with hollow section. One of the major problems in the way of using these sections is lack of appropriate load path to connect beams to them, which ends up using through-plates. Through-plates are plates that pass through column and beams connect to them at their webs. Consequently these plates should have sufficient stiffness in order to provide enough strength. This paper proceeds to study the buckling behavior of through-plates in moment beam to column connections under gravity loads.

Effect of Lu¨ders Bands on the Bending Capacity of Steel Tubes

2010 ◽  
Author(s):  
Julian F. Hallai ◽  
Stelios Kyriakides
Keyword(s):  
Limit State ◽  
Solution Procedure ◽  
Inhomogeneous Deformation ◽  
Pure Bending ◽  
Steel Tubes ◽  
Deformation Regime ◽  
Bending Capacity ◽  
The Moment ◽  
T Values ◽  
Structural Instabilities

In several offshore applications hot-finished pipe that often exhibits Lu¨ders bands is bent to strains of 2–3%. Lu¨ders banding is a material instability that leads to inhomogeneous plastic deformation in the range of 1–4%. It can precipitate structural instabilities and collapse of the pipe. Experiments and analysis are used to study the interaction of the prevalent structural instabilities under bending with Lu¨ders banding, with the objective of providing guidance to the designer. Pure bending experiments on tubes of various D/t values reveal that Lu¨ders bands result in the development of inhomogeneous deformation in the structure, in the form of coexistence of two curvature regimes. Under rotation controlled bending, the higher curvature zone(s) gradually spreads while the moment remains essentially unchanged. For relatively low D/t tubes with relatively smaller Lu¨ders strain, the whole tube eventually is deformed to the higher curvature, subsequently entering the usual hardening regime where it continues to deform uniformly until the expected limit state is reached. For higher D/t tubes and/or for materials with longer Lu¨ders strain, the structure collapses during the inhomogeneous deformation regime. This class of problems is analyzed using 3D finite elements and an elastic-plastic constitutive model with an up-down-up material response. It will be demonstrated that the solution procedure followed can simulate the experiments with consistency.

Stress concentration factors for non-90° X-connections made of square hollow sections

1998 ◽  
Vol 25 (2) ◽  
pp. 370-375 ◽  
Author(s):  
J A Packer ◽  
J Wardenier
Keyword(s):  
Stress Concentration ◽  
Strong Influence ◽  
Hot Spot ◽  
Steel Structures ◽  
Hot Spot Stress ◽  
Hollow Section ◽  
Measured Stress ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Hollow Structural Sections

A number of fatigue experiments and stress concentration factor measurements on non-90°, square hollow section X-connections have been carried out. Comparison of the measured stress concentration factors with those derived from existing parametric formulae for 90° T- and X-connections showed a strong influence of the brace angle. A tentative extension of the range of validity of the parametric formulae for 90° T- and X-connections for other brace angles has been derived.Key words: steel structures, connections, fatigue, hollow structural sections, hot spot stress, stress concentration factors.

SOLITON INTERACTIONS FOR THE GENERALIZED (3+1)-DIMENSIONAL BOUSSINESQ EQUATION

2012 ◽  
Vol 26 (07) ◽  
pp. 1250062 ◽  
Author(s):  
XIAO-LING GAI ◽  
YI-TIAN GAO ◽  
XIN YU ◽  
ZHI-YUAN SUN
Keyword(s):  
Soliton Solution ◽  
Boussinesq Equation ◽  
Soliton Solutions ◽  
Analytic Solutions ◽  
Propagation Process ◽  
Soliton Propagation ◽  
Soliton Interactions ◽  
Pass Through ◽  
The Moment ◽  
The One

Generalized (3+1)-dimensional Boussinesq equation is investigated in this paper. Through the dependent variable transformation and symbolic computation, the one- and two-soliton solutions are obtained. With the one-soliton solution, the coefficient effects in the soliton propagation process are investigated. Through analyzing the two-soliton solution, two kinds of two-soliton interactions are presented: (i) Two solitons merge into a bigger one whose amplitude increases but does not exceed the sum of the two at the moment of the collision; (ii) Two solitons can pass through each other, and their shapes keep unchanged with a phase shift after the separation. In addition, two kinds of analytic solutions are discussed: (i) "Amplitudes" of the two analytic solutions immediately turn to negative (positive) infinity after the "collision"; (ii) Two analytic solutions are fused into a higher peak (valley) at the moment of "collision", whose "amplitudes" change to negative (positive) infinity after the separation.

Ductility of Concrete Encased Cold-Formed Steel Beam with Trapezoidally Corrugated Web

2014 ◽  
Vol 622 ◽  
pp. 65-73 ◽  
Author(s):  
Ravi Divahar ◽  
Philip Saratha Joanna
Keyword(s):  
Carrying Capacity ◽  
Steel Beam ◽  
Displacement Ductility ◽  
Economical Design ◽  
Strength Capacity ◽  
Corrugated Webs ◽  
Corrugated Web ◽  
Earthquake Resistant Structures ◽  
Cold Formed Steel ◽  
The Moment

Engineers have realized that corrugated webs enormously increase their load carrying capacity as well as stability against buckling and can result in very economical design. In this paper, the results of the experiments conducted on cold-formed steel beam with encased trapezoidally corrugated webs with a view to study their strength and ductility are presented. The ductility of cold-formed steel beam with plain web and corrugated web is compared with that of encased trapezoidally corrugated web. Data presented include the load versus deflection curves, load versus strain curves, strength capacity, displacement ductility indices and moment versus curvature curves. It is found that the beam with encased trapezoidally web not only increases the moment carrying capacity but also the ductility. The results showed that the Super elastic property of encased corrugated web beams enhances the usage of it in the earthquake resistant structures.

scholarly journals On Early Evolution of Accreting Stars

1987 ◽  
Vol 115 ◽  
pp. 440-441
Author(s):  
B. M. Shustov ◽  
A. V. Tutukov
Keyword(s):  
Accretion Rate ◽  
Life Time ◽  
Early Evolution ◽  
Dominant Factor ◽  
Spherically Symmetric ◽  
Core Mass ◽  
The Core ◽  
Pass Through ◽  
The Moment ◽  
First Time

Accretion is a dominant factor in the early evolution of stars. The first time an accretion regime settles in is when a dusty opaque core forms. The mass of adiabatically contracting core inside the isothermally collapsing envelope depends only on the optical properties of dust. Spherically symmetric models of dusty cores were constructed using the Henyey technique with accretion boundary conditions (Menshchikov 1986). It appears that all protostars with normal chemical composition should pass through the stage of a quasistatic dusty core. The evolution of dusty cores is similar to that of “normal” young stars with accretion. One could distinguish convective, radiative and central core contraction phases. The life-time tc of the core depends on the core mass Mc and the accretion rate Ṁ (for Mc = 0.01 M⊙ and Ṁ = 1.6x10−6, 1.6x10−5 M⊙/year tc = 1.2x104, 3x103 yrs consequently). After dust exhaustion in the core it collapses and a central ionized quasistatic region grows in several tens of years. A flash of infrared radiation at the moment is not excluded.

Of No Moment

2020 ◽  
Vol 72 (2) ◽  
pp. 203-223
Author(s):  
Kristina Mendicino
Keyword(s):  
Friedrich Nietzsche ◽  
Maurice Blanchot ◽  
Robert Musil ◽  
Established Fact ◽  
To Come ◽  
Pass Through ◽  
The Moment

Abstract Whatever may be said to come to pass could not have happened once, if its iterability is what will have permitted each word thereof to pass for such a one. The very terms for speaking of an occurrence would thus seem to be the impasse that renders each a fiction of no moment, in all senses of that phrase. But this often-cited feature of language could neither be affirmed nor denied once and for all, since either alternative would pretend to address as an established fact that which troubles every establishment. Rather, it is what each time solicits yet another attempt to retrace the turns and detours of those writings that are emphatically marked by the errancy, anachronism, and forgetfulness that recurrence and iterability entail. It is in such an attempt that this article offers commentaries upon several passages from the oeuvres of Friedrich Nietzsche, Maurice Blanchot, and Robert Musil that articulate what could be called the moment of no moment, and that thereby expose the untimely intersections that may come to pass through writing.

Pure Bending Test on a Box Girder With Low Panel’s Slenderness

2018 ◽  
Author(s):  
José Manuel Gordo ◽  
Carlos Guedes Soares
Keyword(s):  
Residual Stresses ◽  
Progressive Collapse ◽  
Bending Moment ◽  
Bending Test ◽  
Box Girder ◽  
Buckling Behavior ◽  
Linear Characteristic ◽  
Collapse Mode ◽  
Post Buckling ◽  
The Moment

The results of a four points bending test on a box girder are presented. The experiment is part of series of tests with similar configuration but different thickness, spacing between longitudinal stiffeners and span between frames. The present work refers to the stockiest plate box girder with a plate’s thickness of 4 mm and a span between frames of 800 mm. The experiment includes initial loading cycles allowing for residual stresses relief. It also includes a series of cycles close to collapse load allowing the analysis of linear characteristic at high levels of load. The moment curvature relationship is established for a large range of curvatures. The ultimate bending moment of the box is evaluated and compared with the first yield moment and the plastic moment allowing the evaluation of the efficiency of the structure. The post buckling behavior and collapse mode are characterized. Comparison of the experiment with a progressive collapse method is made taking into consideration the effect of residual stresses on envelop of the moment curvature curve of the structure.

scholarly journals Experimental Research on Joint Mechanical Behavior of Container Structures

2015 ◽  
pp. 215-222
Author(s):  
Ye Lu ◽  
GuoQiang Li ◽  
Lei Mao
Keyword(s):  
Failure Modes ◽  
High Efficiency ◽  
Low Cost ◽  
Tall Buildings ◽  
Shear Capacity ◽  
Modular System ◽  
Building Industry ◽  
Flexural Stiffness ◽  
Structural System ◽  
Bending Capacity

In recent years, building industry in China is experiencing upgrade and industrialization becomes popular. Container building has many advantages including low cost, high efficiency and clean construction. Therefore it is the most promising kind of industrialized building. The joint of boxes in container buildings is one of the main bottlenecks in restricting box-type architecture in multi-story and tall buildings. To solve this problem in box-type buildings, this paper present a new joint of boxes applied to a specific structural system named as column-bearing box-type modular system. The tensile capacity, shear capacity and corresponding failure modes of vertical two-box joint are obtained through experimental study. Meanwhile the flexural bending capacity and flexural stiffness of the vertical two-box joint are studied.

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