Testing and analysis on nonlinear creep behaviour of concrete-filled steel tubes with circular cross-section

2019 ◽  
Vol 185 ◽  
pp. 26-46 ◽  
Author(s):  
Yu Yin Wang ◽  
Yue Geng ◽  
Jie Chen ◽  
Mu Zi Zhao
Keyword(s):  
Cross Section ◽  
Creep Behaviour ◽  
Circular Cross Section ◽  
Nonlinear Creep ◽  
Steel Tubes ◽  
Concrete Filled Steel Tubes

scholarly journals Validation of Welding Simulations Using Thermal Strains Measured with DIC

2011 ◽  
Vol 70 ◽  
pp. 129-134 ◽  
Author(s):  
Maarten De Strycker ◽  
Pascal Lava ◽  
Wim Van Paepegem ◽  
Luc Schueremans ◽  
Dimitri Debruyne
Keyword(s):  
Residual Stresses ◽  
Cross Section ◽  
Circular Cross Section ◽  
Welding Process ◽  
Weld Bead ◽  
Image Correlation ◽  
Steel Tubes ◽  
Element Analysis ◽  
Strain Evolution ◽  
The Cross

Residual stresses can affect the performance of steel tubes in many ways and as a result their magnitude and distribution is of particular interest to many applications. Residual stresses in cold-rolled steel tubes mainly originate from the rolling of a flat plate into a circular cross section (involving plastic deformations) and the weld bead that closes the cross section (involving non-uniform heating and cooling). Focus in this contribution is on the longitudinal weld bead that closes the cross section. To reveal the residual stresses in the tubes under consideration, a finite element analysis (FEA) of the welding step in the production process is made. The FEA of the welding process is validated with the temperature evolution of the thermal simulation and the strain evolution for the mechanical part of the analysis. Several methods for measuring the strain evolution are available and in this contribution it is investigated if the Digital Image Correlation (DIC) technique can record the strain evolution during welding. It is shown that the strain evolution obtained with DIC is in agreement with that found by electrical resistance strain gauges. The results of these experimental measuring methods are compared with numerical results from a FEA of the welding process.

scholarly journals Experimental Behavior of Composite Infilled & Encased Column by using MSAND, Metakaolin & Recron Fibre

2019 ◽  
Vol 8 (4) ◽  
pp. 12508-12514
Keyword(s):  
Compressive Strength ◽  
Cross Section ◽  
Load Carrying Capacity ◽  
Steel Tubes ◽  
Circular Section ◽  
Concrete Filled Tubes ◽  
Load Carrying ◽  
Fiber Concrete ◽  
Infill Material ◽  
Concrete Filled Steel Tubes

In this analysis, take a look at on compressive strength of composite infilled and encased columns were done. Compressive strength of hollow, tubular and encased typical section in addition as Msand, silcafume, metakaolin & recorn fiber concrete-filled tubes were decided. Cross-section, compressive strength, and mode of failure of the column to be explored. The circular section and square section were selected for this research. The association between the load, and the later displacement at the mid-tallness, base, and top of the sections inside the bearing of each the durable and powerless axes, and furthermore the connections of burden versus complete the process of shortening for each example was reliably recorded. It completely was discovered that the load carrying limit differs with importance to the cross-section of the specimen, compressive strength of the infill material. The investigation is carried out for the water-cement ratio of 0.5% for in composite column of size 150 × 150 × 1800 mm and diameter of 1800 mm of square and circular section. Then the specimens are to be tested on 7th day, 14th day and 28th day. The circular specimens having higher load-carrying capacity than square specimens. Msand, metakaolin and recron fiber waterproof agent concrete infilled in and encased steel tubes show 5% to 15 % more strength than typical control concrete-filled steel tubes.

scholarly journals Parametric study on the behaviour of bolted composite connections

2012 ◽  
Vol 5 (4) ◽  
pp. 468-499
Author(s):  
M. N. Kataoka ◽  
A. L. H. C. El Debs
Keyword(s):  
Numerical Model ◽  
Cross Section ◽  
Cross Sections ◽  
Parametric Analysis ◽  
Bending Moment ◽  
Composite Beams ◽  
Steel Tubes ◽  
Composite Connections ◽  
Concrete Filled Steel Tubes ◽  
Steel Deck

The studied connections are composed of concrete filled steel tubes (CFT) connected to composite beams by passing through bolts, endplates and steel deck, which also contributes to support the applied loads. The parametric analysis presented in this work is based on numerical simulations performed with software TNO Diana, using experimental results to calibrate the reference numerical model. The influence of three main parameters, being them the bolts diameter, the slab height and the beams cross section, was evaluated. According to the obtained bending moment versus rotation curves, it was concluded that, among the three parameters analyzed, the most important one was the bolts diameter. About the beams cross section, inconclusive results were achieved, probably due to the incompatibility between the 16 mm bolts and the robust beam cross sections considered in the parametric analysis.

CONCRETE-FILLED TUBULAR COLUMNS: PART 1 — CROSS-SECTION ANALYSIS

2004 ◽  
Vol 04 (04) ◽  
pp. 459-478 ◽  
Author(s):  
V. GAYATHRI ◽  
N. E. SHANMUGAM ◽  
Y. S. CHOO
Keyword(s):  
Cyclic Loading ◽  
Cross Section ◽  
Uniaxial Stress ◽  
Steel Tubes ◽  
Cross Sectional ◽  
Tubular Columns ◽  
Fiber Analysis ◽  
The Cross ◽  
Interaction Curves ◽  
Concrete Filled Steel Tubes

A fiber-based approach is adopted to study the cross-sectional behavior of concrete-filled steel tubes subjected to monotonic and cyclic loading. Constitutive behavior of the cross-section is formulated by explicitly dividing the section into fibers, and uniaxial stress–strain rules for steel and concrete are defined. Interaction curves, Moment–Thrust–Curvature (M–P–φ) relations and Moment–Thrust–Strain (M–P–ε) relations are developed for circular and box-shaped in-filled sections based on fiber analysis. A fiber model is also developed to describe the nonlinear response of concrete-filled steel tubes subjected to cyclic loading. M–P–φ relations are developed for arbitrary loading histories using this simple yet reliable approach. Results are compared with the numerical and experimental data available in published literature, and the accuracy of the proposed model is thus ascertained.

SAF file: It's really three dimensional file

2018 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Prof. Dr. Jamal Aziz Mehdi
Keyword(s):  
Cross Section ◽  
Root Canal ◽  
Three Dimensional ◽  
Circular Cross Section ◽  
Circular Motion ◽  
Root Canal Treatment ◽  
Metal Core ◽  
Rotating Blade

The biological objectives of root canal treatment have not changed over the recentdecades, but the methods to attain these goals have been greatly modified. Theintroduction of NiTi rotary files represents a major leap in the development ofendodontic instruments, with a wide variety of sophisticated instruments presentlyavailable (1, 2).Whatever their modification or improvement, all of these instruments have onething in common: they consist of a metal core with some type of rotating blade thatmachines the canal with a circular motion using flutes to carry the dentin chips anddebris coronally. Consequently, all rotary NiTi files will machine the root canal to acylindrical bore with a circular cross-section if the clinician applies them in a strictboring manner

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