Analysis of composite section columns under axial compression and biaxial bending moments.

2013 ◽  
pp. 1543-1550
Keyword(s):  
Axial Compression ◽  
Bending Moments ◽  
Biaxial Bending ◽  
Composite Section

05.07: Structural behaviour of simple steel beams subject to axial compression, biaxial bending moments and torsion

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 1076-1085 ◽  
Author(s):  
Adrian Walter ◽  
Julia Herbersagen ◽  
Rebekka Winkler ◽  
Markus Knobloch
Keyword(s):  
Axial Compression ◽  
Steel Beams ◽  
Bending Moments ◽  
Biaxial Bending ◽  
Structural Behaviour

A characteristic type of instability in the large deflexions of elastic plates III. Curved rectangular plates in axial compression

1954 ◽  
Vol 222 (1148) ◽  
pp. 44-59 ◽  
Keyword(s):  
Axial Compression ◽  
Rectangular Plates ◽  
Bending Moments ◽  
Elastic Plates ◽  
Characteristic Type ◽  
Circular Tubes ◽  
Axis Parallel ◽  
Post Buckling ◽  
Thin Walled ◽  
The Stability

The analysis of part I is extended to deal with the case of free-edged rectangular plates having an initial curvature about an axis parallel to one pair of opposite edges and loaded by distributed bending moments applied to the straight edges and compressive forces applied to the curved edges. In particular, the stability and post-buckling behaviour of such plates subjected to the compressive forces alone is studied. The axially symmetrical buckling of thin-walled circular tubes in axial compression is also considered. Experimental plates are found to buckle at loads rather lower than those predicted.

Moment Measurements in Dynamic and Quasi-Static Spine Segment Testing Using Eccentric Compression are Susceptible to Artifacts Based on Loading Configuration

2014 ◽  
Vol 136 (12) ◽  
Author(s):  
Carolyn Van Toen ◽  
Jarrod W. Carter ◽  
Thomas R. Oxland ◽  
Peter A. Cripton
Keyword(s):  
Axial Compression ◽  
Load Cell ◽  
Bending Moments ◽  
Equilibrium Equations ◽  
Test Configuration ◽  
Hinge Joint ◽  
Rubber Specimen ◽  
Eccentric Compression ◽  
Dynamic Experiments ◽  
Spine Segment

The tolerance of the spine to bending moments, used for evaluation of injury prevention devices, is often determined through eccentric axial compression experiments using segments of the cadaver spine. Preliminary experiments in our laboratory demonstrated that eccentric axial compression resulted in “unexpected” (artifact) moments. The aim of this study was to evaluate the static and dynamic effects of test configuration on bending moments during eccentric axial compression typical in cadaver spine segment testing. Specific objectives were to create dynamic equilibrium equations for the loads measured inferior to the specimen, experimentally verify these equations, and compare moment responses from various test configurations using synthetic (rubber) and human cadaver specimens. The equilibrium equations were verified by performing quasi-static (5 mm/s) and dynamic experiments (0.4 m/s) on a rubber specimen and comparing calculated shear forces and bending moments to those measured using a six-axis load cell. Moment responses were compared for hinge joint, linear slider and hinge joint, and roller joint configurations tested at quasi-static and dynamic rates. Calculated shear force and bending moment curves had similar shapes to those measured. Calculated values in the first local minima differed from those measured by 3% and 15%, respectively, in the dynamic test, and these occurred within 1.5 ms of those measured. In the rubber specimen experiments, for the hinge joint (translation constrained), quasi-static and dynamic posterior eccentric compression resulted in flexion (unexpected) moments. For the slider and hinge joints and the roller joints (translation unconstrained), extension (“expected”) moments were measured quasi-statically and initial flexion (unexpected) moments were measured dynamically. In the cadaver experiments with roller joints, anterior and posterior eccentricities resulted in extension moments, which were unexpected and expected, for those configurations, respectively. The unexpected moments were due to the inertia of the superior mounting structures. This study has shown that eccentric axial compression produces unexpected moments due to translation constraints at all loading rates and due to the inertia of the superior mounting structures in dynamic experiments. It may be incorrect to assume that bending moments are equal to the product of compression force and eccentricity, particularly where the test configuration involves translational constraints and where the experiments are dynamic. In order to reduce inertial moment artifacts, the mass, and moment of inertia of any loading jig structures that rotate with the specimen should be minimized. Also, the distance between these structures and the load cell should be reduced.

scholarly journals Columnas Compuestas de Hormigón y Acero SRC, Sujetas a Flexocompresión Biaxial

2018 ◽  
Vol 3 (1) ◽  
pp. 281
Author(s):  
Jorge Ricardo Vintimilla Jaramillo ◽  
Luis Tinerfe Hernández Rodríguez
Keyword(s):  
Axial Compression ◽  
Bending Strength ◽  
Longitudinal Direction ◽  
Biaxial Bending ◽  
Load Curve ◽  
Composite Columns ◽  
Interaction Diagram ◽  
European Code ◽  
Made In

The work presented is based on experimental and theoretical analysis of SRC composite columns subjected to biaxial bending and axial compression, where the specification of American and European code criteria are used to calculate de load bending strength. The computer program to calculate the interaction diagram of biaxial bending and axial compression with inclined neutral axis is made in the software Matlab by using the fiber method, besides, the strength of the specimen is calculated. Users can design new frame sections and check the exist sections. To obtain the displacements and load curve, to calculate load contours and determination of the interaction family curves of the modeled sections. The destructive performance of the round and rectangle composite columns are made in the structures laboratory of EPN to obtain the results such as the buckling displacement at strong, weak and longitudinal direction measured with LVDT´S. Subsequently, the theoretical and experimental analysis results are made to demonstrate the reliability of the numeric model.Keywords: Composite Columns, Concrete, Steel

scholarly journals Comparison between resistant load contours generated considering the parabolic-rectangular (DPR) and the rectangular (DR) stress-strain diagrams for rectangular sections under combined axial compression and biaxial bending

2018 ◽  
Vol 11 (3) ◽  
pp. 455-473
Author(s):  
Y. F. FONSECA ◽  
A. S. C. SILVA
Keyword(s):  
Axial Compression ◽  
Cross Section ◽  
Cross Sections ◽  
Strength Class ◽  
Concrete Strength ◽  
Strain Diagram ◽  
Biaxial Bending ◽  
Stress Strain ◽  
Oblique Loading ◽  
Stress Diagram

Abstract The aim of this study is to compare the load contour diagrams generated for rectangular RC cross-sections under combined axial compression and biaxial bending obtained by the two forms of analysis allowed by NBR 6118:2014 [1]: the first using the parabolic-rectangular stress-strain diagram (DPR) and the second using the rectangular (constant stress) diagram (DR). In order to compare the load contours generated, a reference cross-section was adopted for which the concrete strength class (from C20 to C90) and the deformation domains (4, 4a and 5) were varied for the study. It was studied whether the use of the different diagrams (DPR or DR) would provide greater (or smaller) resistant efforts for the same section. The results show that the use of the DR is only acceptable when the section is working up to the 4th domain. Above this domain, it was observed that the use of this diagram shows resistant efforts inferior to those calculated by the DPR. In addition, it was found that, for concretes with resistance class above C50, in oblique loading directions, the use of the DR presents higher resistant efforts than those calculated using the DPR.

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