Behaviour of short columns subjected to cyclic shear displacements: Experimental results

2007 ◽  
Vol 29 (8) ◽  
pp. 2018-2029 ◽  
Author(s):  
M. Moretti ◽  
T.P. Tassios
Keyword(s):  
Experimental Results ◽  
Cyclic Shear ◽  
Short Columns

Experimental Study on the Axial Loading Tests of RC Columns Strengthened with Steel Tube

2012 ◽  
Vol 204-208 ◽  
pp. 2878-2882 ◽  
Author(s):  
Miao Zhou ◽  
Jian Wei Li ◽  
Jing Min Duan
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Axial Loading ◽  
Steel Tube ◽  
Experimental Results ◽  
Engineering Practice ◽  
Rc Columns ◽  
Short Columns ◽  
Loading Tests ◽  
Engineering Staff

This paper carries out a series of experimental study on 6 column specimens, analyses and compares with the different parameters on the axial loading tests of RC columns and RC columns strengthened with steel tube. The experimental results show that the RC columns strengthened with steel tube take full advantage of loading properties of both materials, thus greatly improve the bearing capacity of specimens. With the same wall thickness steel tube, the improving degree of bearing capacity of long columns is bigger than the short columns, and the reinforcement effect is more obvious. The experimental results can offer reference for scientific research and engineering staff, and promote this reinforcement method to be widely used in engineering practice.

A Damage Mechanics-Based Fatigue Life Prediction Model for Solder Joints

2003 ◽  
Vol 125 (1) ◽  
pp. 120-125 ◽  
Author(s):  
Hong Tang ◽  
Cemal Basaran
Keyword(s):  
Fatigue Life ◽  
Prediction Model ◽  
Life Prediction ◽  
Damage Mechanics ◽  
Solder Joints ◽  
Experimental Results ◽  
Fatigue Life Prediction ◽  
Isotropic Hardening ◽  
Cyclic Shear ◽  
Life Prediction Model

A thermomechanical fatigue life prediction model based on the theory of damage mechanics is presented. The damage evolution, corresponding to the material degradation under cyclic thermomechanical loading, is quantified thermodynamic framework. The damage, as an internal state variable, is coupled with unified viscoplastic constitutive model to characterize the response of solder alloys. The damage-coupled viscoplastic model with kinematic and isotropic hardening is implemented in ABAQUS finite element package to simulate the cyclic softening behavior of solder joints. Several computational simulations of uniaxial monotonic tensile and cyclic shear tests are conducted to validate the model with experimental results. The behavior of an actual ball grid array (BGA) package under thermal fatigue loading is also simulated and compared with experimental results.

A Method for Deformation Analysis of Bar-Reinforced Concrete Filled Steel Tubular Columns under Axial Compression

2010 ◽  
Vol 163-167 ◽  
pp. 576-581
Author(s):  
Jin Sheng Han ◽  
Shu Ping Cong
Keyword(s):  
Reinforced Concrete ◽  
Axial Compression ◽  
Deformation Process ◽  
Steel Tube ◽  
Experimental Results ◽  
Lateral Strain ◽  
Deformation Analysis ◽  
Simple Method ◽  
Full Load ◽  
Short Columns

Based on experimental researches, a simple numerical analysis method was presented to simulate the full load-deformation process of bar-reinforced concrete filled steel tubular short columns subjected to axial compression. Firstly, the interaction process of steel tube and concrete was analyzed, and then, the simplified constitutive models of steel tube and concrete were established on the base of previous analysis results. Secondly, the relation between lateral and longitudinal strain of steel tube was analyzed based on experimental results, and a simple method was presented to calculate the lateral strain of steel tube. Finally, a program was worked out to simulate the full load-deformation process of bar-reinforced concrete filled steel tubular short columns. The program’s simulation results of both ultimate bearing capacity and load-deformation curves are in good agreement with the experimental results.

Implementation of a Thermodynamic Framework for Damage Mechanics of Solder Interconnects in Microelectronic Packaging

2002 ◽  
Author(s):  
Cemal Basaran ◽  
Hong Tang
Keyword(s):  
Damage Mechanics ◽  
Internal State ◽  
Fatigue Loading ◽  
Cyclic Softening ◽  
Experimental Results ◽  
Isotropic Hardening ◽  
Cyclic Shear ◽  
Softening Behavior ◽  
Thermodynamic Framework ◽  
Bga Package

A thermo mechanical fatigue life prediction model based on the theory of damage mechanics is presented. The damage evolution, corresponding to the material degradation under cyclic thermo mechanical loading, is quantified thermodynamic framework. The damage, as an internal state variable, is coupled with unified viscoplastic constitutive model to characterize the response of solder alloys. The damage-coupled viscoplastic model with kinematic and isotropic hardening is implemented in ABAQUS finite element package to simulate the cyclic softening behavior of solder joints. Several computational simulations of uniaxial monotonic tensile and cyclic shear tests are conducted to validate the model with experimental results. The behavior of an actual Ball Grid Array (BGA) package under thermal fatigue loading is also simulated and compared with experimental results.

scholarly journals A Simple Formula for Prediction of Compressive Strength of Square CFT Columns

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Muhammad Aun Bashir
Keyword(s):  
Finite Element ◽  
Compressive Strength ◽  
Composite Structures ◽  
Slenderness Ratio ◽  
Steel Tube ◽  
Experimental Results ◽  
Simple Equation ◽  
Material Strength ◽  
Concrete Filled Steel Tube ◽  
Short Columns

Concrete filled steel tube structures are becoming very popular in the modern civil engineering projects. Studying composite structures is useful, since it is an innovative and contemporary way to build structures. This type of structure has the ability to use respective strength of both steel and concrete due to confinement. Prefabrication of steel tube section is beneficial, and allows rapid installation into main structure. It also reduces the assembly cost and construction time. This paper will present the simple equation to predict the compressive strength of square concrete filled steel tube by using Finite Element Analysis (FEA)based software ABAQUs. In this study, 3D non-linear finite element models of short square composite columns were prepared using ABAQUS. The results were compared with published experimental tests of a concrete filled steel tube short columns. After getting the good agreement with the experimental results, a simple equation for the prediction of compressive strength is presented by considering the width to thickness ratio of steel tube. Results are validated with experimental results. The equation can predict the compressive strength only for the given material strengths and in future, the simple equation can be improved by considering different parameters e.g. material strength, slenderness ratio and end conditions.

Viscoelastic relaxation in liquid mixtures

1969 ◽  
Vol 309 (1499) ◽  
pp. 473-496 ◽  
Keyword(s):  
Molecular Weight ◽  
Binary Mixtures ◽  
Mole Fraction ◽  
Supercooled Liquids ◽  
Experimental Results ◽  
Viscoelastic Relaxation ◽  
Cyclic Shear ◽  
Additional Constant ◽  
Family Of Curves ◽  
Complex Compliance

The authors have previously described a model from which the viscoelastic relaxation of supercooled liquids in alternating shear can be predicted. According to this model, the complex compliance of the liquid is represented by the equation J * = 1/ G ∞ [1+1/j ωr +2/(j ωr ) 4 ], where G ∞ is the limiting high frequency shear modulus and r is the Maxwell relaxation time ( = η/G ∞ ). Measurements have now been made of the viscoelastic properties of binary mixtures of pure liquids which separately conform to the description of the above model and results obtained on seven such mixtures are reported in this paper. In all cases, it is found that viscoelastic relaxation in these systems can be accounted for by the introduction of a single additional constant, K , into the equation for the complex compliance such that J * = 1/ G ∞ [1 + 1/j ωr + 2 K /(j ωr ) 1/2 ]. The value of the constant K is found by comparing experimental results over the region of viscoelastic relaxation with a family of curves computed for different values of K . For binary mixtures in which the two components have either closely similar molecular weights or are isomers, the original model ( K = 1) applies for all concentrations investigated. However, if the components of the mixture differ appreciably in molecular weight, a systematic variation of K with mole fraction is found. A single curve of K against mole fraction of the lower molecular weight components represents the results obtained on four such mixtures of liquids which differ significantly in molecular composition. The maximum value of K is 1·8 at 0·8 mole fraction and the minimum value is 0·25 at 0·2 mole fraction. For all mixtures K is equal to unity at 0·5 mole fraction. Results are given for a number of other liquids including white oil ( K = 1) and castor oil, for which K is equal to 2·90. Without exception, all non-polymeric liquids on which measurements have been made show a viscoelastic behaviour in cyclic shear which can be fitted by the present model with an appropriate choice for the value of the constant K . Agreement between the calculated curves and experimental results is within experimental error over the ranges of frequency and temperature employed in this work. In accordance with previous work, K is equal to unity for pure supercooled liquids.

Cyclic shear behavior and shear strength of steel tubed-reinforced-concrete short columns

2018 ◽  
Vol 21 (11) ◽  
pp. 1749-1760 ◽  
Author(s):  
Jiepeng Liu ◽  
Dan Gan ◽  
Xuhong Zhou ◽  
Biao Yan
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Shear Behavior ◽  
Cyclic Shear ◽  
Short Columns

Research on Post-Fire Bearing Capacity of Ceramsite Concrete Filled Steel Tubular Short Columns

2011 ◽  
Vol 255-260 ◽  
pp. 251-254 ◽  
Author(s):  
Xin Tang Wang ◽  
Ming Zhou ◽  
Jie Yin ◽  
Yao Ji
Keyword(s):  
Mechanical Behavior ◽  
Bearing Capacity ◽  
Experimental Results ◽  
Maximum Response ◽  
Fire Load ◽  
Short Columns ◽  
Maximum Value ◽  
Mix Proportion ◽  
Concrete Mix ◽  
Strength And Ductility

Mechanical behavior and bearing capacity of ceramsite concrete filled steel tubular short column (noted as CCSSC) subjected to fire load are experimentally investigated. Effect of the parameters, such as the maximum value of fire temperatures, fire duration on the strength and ductility of the two types of specimens were especially discussed. The experimental results show that all the specimens of CCSSC have higher post-fire bearing capacity and better ductility, and there was no descent segment in load-displacement curves of the most specimens after the fire load was subjected. It was concluded that the maximum response temperature of specimens and fire duration time has great effect on the axial bearing capacity of concrete-filled steel tubular short columns subjected to fire, and the concrete mix proportion has some effect on both of bearing capacity and ductility of CCSSC subjected to fire load.

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