scholarly journals FLEXURAL BEHAVIOR OF CONCRETE FILLED CIRCULAR STEEL TUBULAR COLUMNS SUBJECTED TO MONOTONIC BENDING MOMENT UNDER CONSTANT AXIAL LOAD Part 2 Influence of diameter to wall thickness ratio and methods of estimating bending moment-curvature relationships

1998 ◽  
Vol 63 (508) ◽  
pp. 135-141
Author(s):  
Toshihiko NINAKAWA ◽  
Ichiro ISHIDE ◽  
Kenji SAKINO
Keyword(s):  
Wall Thickness ◽  
Axial Load ◽  
Bending Moment ◽  
Thickness Ratio ◽  
Flexural Behavior ◽  
Tubular Columns ◽  
Constant Axial Load

scholarly journals Strength Assessment of wedges in the Splice Zone of the Column

2020 ◽  
Vol 10 (1) ◽  
pp. 302-307
Keyword(s):  
Cross Section ◽  
Axial Load ◽  
Bending Moment ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Element Analysis ◽  
Strength Assessment ◽  
Lower Base ◽  
Hinge Zone ◽  
Constant Axial Load

Splice zone is the lower base of cross-section and a part of column which is also known as lower hinge zone. It is the weaker part of the column so additional reinforcement should be required every time in case of regular pad footing. The presented research provides a way of strengthening the reinforced concrete column by applying wedges at the splice zone. The work is focused on the base cross-section of an isolated footing against deflection, stresses, bending moment, etc. By implementing the proposed work, we can avoid critical damage at the base cross-section of the column & it also provides more stability, thus make splice zone stronger than earlier to withstand the resistance. The two sets of footings are considered in which one is regular pad footing & the other is pad footing strengthened by applying wedges in the splice zone. Both of them are tested under constant axial load and moment. The static structural analysis is done by using finite element analysis in ANSYS 2016 software. Further we will observe the deflection, stresses & also the overall effects of applying wedges with multiple height & size at the splice zone of the column.

Seismic Performance of Reinforced Concrete Beam to Concrete-Filled Steel Tubular Columns Joints

2008 ◽  
Vol 400-402 ◽  
pp. 685-691
Author(s):  
Hui Qu ◽  
Lin Hai Han ◽  
Zhong Tao
Keyword(s):  
Reinforced Concrete ◽  
Axial Load ◽  
Concrete Beam ◽  
Horizontal Displacement ◽  
Reinforced Concrete Beam ◽  
Load Level ◽  
Tubular Columns ◽  
Test Parameters ◽  
Section Type ◽  
Constant Axial Load

In this paper, eight reinforced concrete (RC) beam to concrete-filled steel tubular (CFST) column joints enclosed by rebars were tested under reversal horizontal displacement with constant axial load in order to study their seismic behavior. The test parameters are axial load level and the section type of CFST column. In this study, the failure model, hysteretic characteristic, ductility and energy dissipation were investigated. The results indicated that the anti-earthquake abilities of all joints satisfied with the demand on the code.

Influence of Slenderness on High-Strength Rectangular Concrete-Filled Tubular Columns with Axial Load and Nonconstant Bending Moment

2012 ◽  
Vol 138 (12) ◽  
pp. 1436-1445 ◽  
Author(s):  
D. Hernández-Figueirido ◽  
M. L. Romero ◽  
J. L. Bonet ◽  
J. M. Montalvá
Keyword(s):  
Axial Load ◽  
Bending Moment ◽  
High Strength ◽  
Tubular Columns

Preliminary Parametric Assessment of a Bolted Endplate Joint under Combined Axial Force and Cyclic Bending Moment

2011 ◽  
Vol 255-260 ◽  
pp. 718-721
Author(s):  
Z.Y. Wang ◽  
Q.Y. Wang
Keyword(s):  
Finite Element Analysis ◽  
Axial Force ◽  
Seismic Design ◽  
Axial Load ◽  
Failure Modes ◽  
Bending Moment ◽  
Element Analysis ◽  
Cyclic Behaviour ◽  
Joint Behaviour ◽  
Steel Joints

Problems regarding the combined axial force and bending moment for the behaviour of semi-rigid steel joints under service loading have been recognized in recent studies. As an extended research on the cyclic behaviour of a bolted endplate joint, this study is performed relating to the contribution of column axial force on the cyclic behaviour of the joint. Using finite element analysis, the deteriorations of the joint performance have been evaluated. The preliminary parametric study of the joint is conducted with the consideration of flexibility of the column flange. The column axial force was observed to significantly influence the joint behaviour when the bending of the column flange dominates the failure modes. The reductions of moment resistance predicted by numerical analysis have been compared with codified suggestions. Comments have been made for further consideration of the influence of column axial load in seismic design of bolted endplate joints.

scholarly journals Comparison of bending stiffness of six different colours of copolymer polypropylene

1999 ◽  
Vol 23 (1) ◽  
pp. 63-71 ◽  
Author(s):  
R. S. Ross ◽  
R. J. Greig ◽  
P. Convery
Keyword(s):  
Electron Microscope ◽  
Wall Thickness ◽  
Modulus Of Elasticity ◽  
Microscope Study ◽  
Electron Microscope Study ◽  
Bending Moment ◽  
Bending Stiffness ◽  
Ankle Foot Orthosis ◽  
Uniform Wall ◽  
Foot Orthosis

This paper compares the bending stiffness of 5 different colours of copolymer polypropylene (CCP) with that of natural copolymer polypropylene (NCP). Flesh coloured and natural sheets are supplied thicker than other pigmented sheet. The bending stiffness of a specimen may be defined as EI, i.e. the product of E, Young's modulus of elasticity and I, the 2nd moment of area. Strips of “as supplied” (AS) and “post-draped” (PD) specimen were clamped and subjected to bending to assess the effect of pigmentation on bending characteristics. The gradient of the graph of bending deflection δ versus bending moment enables EI to be estimated. The process of thermoforming polypropylene reduces EI, the bending stiffness. However, the manual draping and vacuum procedure introduces so many variables that it is difficult to quantify the effect of pigmentation. The E of a bent specimen may be estimated from the gradient of the graph of δI versus bending moment. In the case of AS sheet, the effect of pigmentation on E is inconclusive. PD specimens indicate a significant reduction in E due to thermoforming. This was verified by an electron-microscope study of AS and PD specimens. Draping an ankle-foot orthosis (AFO) results in a non-uniform wall thickness. The results of this study with respect to the effects of pigmentation on the bending stiffness of AFOs are inconclusive. More detailed studies require to be completed in order to confirm which factors are responsible for this non-uniformity in wall thickness and consequent variation in bending stiffness.

scholarly journals Flexural-Torsional Vibration of Thin-Walled Beams Subjected to Combined Initial Axial Load and End Bending Moment: Application to the Design of Saw Tooth Blades

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Van Binh Phung ◽  
Anh Tuan Nguyen ◽  
Hoang Minh Dang ◽  
Thanh-Phong Dao ◽  
V. N. Duc
Keyword(s):  
Boundary Conditions ◽  
Axial Load ◽  
Stability Boundary ◽  
Bending Moment ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Rayleigh Method ◽  
Thin Walled ◽  
The Stability ◽  
Fixed End

The present paper analyzes the vibration issue of thin-walled beams under combined initial axial load and end moment in two cases with different boundary conditions, specifically the simply supported-end and the laterally fixed-end boundary conditions. The analytical expressions for the first natural frequencies of thin-walled beams were derived by two methods that are a method based on the existence of the roots theorem of differential equation systems and the Rayleigh method. In particular, the stability boundary of a beam can be determined directly from its first natural frequency expression. The analytical results are in good agreement with those from the finite element analysis software ANSYS Mechanical APDL. The research results obtained here are useful for those creating tooth blade designs of innovative frame saw machines.

Experimental Investigation of Stiffened Square CFST Columns under Axial Load

2014 ◽  
Vol 919-921 ◽  
pp. 1794-1800
Author(s):  
Xin Zhi Zheng ◽  
Xin Hua Zheng
Keyword(s):  
Experimental Investigation ◽  
Bearing Capacity ◽  
Cross Sections ◽  
Axial Load ◽  
Local Buckling ◽  
Test Results ◽  
Tubular Columns ◽  
Economical Benefit ◽  
Steel Consumption ◽  
Cfst Columns

Abstract: 7 square steel tubular columns were tested to discuss the ultimate axial bearing capacity, ductility performance and the steel consumption under stiffened by steel belts and binding bars of different cross-sections. Test results indicate that only by increasing fewer amounts of steel usage, stiffened square CFST columns with binding bars can not only improve the overall effects of restraint and alleviate regional local buckling between the binding bars, but also improve the bearing capacity of concrete filled square steel tubular columns. The utility benefits and the economical benefit is considerable, deserving extensive use.

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