A numerical study on the ultimate load of offshore two-planar tubular TT-joints reinforced with internal ring stiffeners at fire-induced elevated temperatures

2021 ◽  
Vol 230 ◽  
pp. 108797
Author(s):  
Neda Azari-Dodaran ◽  
Hamid Ahmadi
Keyword(s):  
Ultimate Load ◽  
Elevated Temperatures ◽  
Numerical Study ◽  
Internal Ring

Numerical study of heat and moisture transport through concrete at elevated temperatures

2014 ◽  
Vol 28 (5) ◽  
pp. 1967-1977 ◽  
Author(s):  
Arul Peter ◽  
Krishnan Murugesan ◽  
UmeshKumar Sharma ◽  
Puneet Arora
Keyword(s):  
Moisture Transport ◽  
Elevated Temperatures ◽  
Numerical Study ◽  
Heat And Moisture Transport ◽  
Heat And Moisture

Behaviour and design of composite beams with composite slabs at elevated temperatures

2016 ◽  
Vol 20 (10) ◽  
pp. 1451-1465 ◽  
Author(s):  
Shou-Chao Jiang ◽  
Gianluca Ranzi ◽  
Ling-Zhu Chen ◽  
Guo-Qiang Li
Keyword(s):  
Elevated Temperatures ◽  
Numerical Study ◽  
Three Dimensional ◽  
Structural Response ◽  
Load Ratio ◽  
Element Model ◽  
Composite Beams ◽  
European Guidelines ◽  
Design Fire ◽  
Composite Slabs

This article presents an extensive experimental and numerical study aimed at the evaluation of the thermo-structural response of composite beams with composite slabs. Two full-scale fire tests were carried out on simply supported composite steel-concrete beams with steel sheeting perpendicular and parallel to the steel joist, respectively. Both specimens were observed to fail by developing large displacements. Concrete crushing at the mid-span, debonding of the profiled sheeting and spalling of the fire protection were observed during both tests. A three-dimensional finite element model was developed in ABAQUS, and its accuracy was validated against the experimental measurements collected as part of this study. The model was then used to perform a parametric study to determine the influence of the degree of shear connection, load ratio and design fire rate on the structural response of composite beams at elevated temperatures. These results, together with experimental data available in the literature, were used to evaluate the ability of European guidelines to predict the critical temperature of composite beams. It was shown that predictions from Eurocode 4 were safe and provided conservative estimates for most cases.

Damage evolution in vibration assisted nano impact machining by loose abrasives at elevated temperatures: A numerical study

2019 ◽  
Vol 47 ◽  
pp. 357-366
Author(s):  
N. Duong ◽  
V.K. Kore ◽  
J. Ma ◽  
S. Lei ◽  
M.P. Jahan ◽  
...  
Keyword(s):  
Damage Evolution ◽  
Elevated Temperatures ◽  
Numerical Study

Experimental Investigation on Stability of Circular Steel Tubular Stub Columns at Elevated Temperatures Under Axial Compression

2019 ◽  
Vol 19 (06) ◽  
pp. 1950063 ◽  
Author(s):  
Kang He ◽  
Yu Chen
Keyword(s):  
High Temperature ◽  
Axial Compression ◽  
Ultimate Load ◽  
Elevated Temperatures ◽  
Steel Tube ◽  
High Temperature Treatment ◽  
Load Curve ◽  
Loading Test ◽  
Compressive Stiffness ◽  
Stub Columns

This paper studies the structural stability of circular steel tubular stub columns at elevated temperatures under axial compression. Fifty-one specimens are subjected to high-temperature treatment and axial compression. The variables of the specimen are temperature, wall thickness of steel tube and duration of high temperature. The displacement–load curve, strain–load curve, ultimate load, axial compressive stiffness and failure characteristics of the specimens were analyzed. Test results show that after exposure to high temperatures, the specimens’ failure phenomenon in the axial compression loading test is consistent with that at room temperature, the bearing capacity decreases considerably, the ductility decreases slightly and the axial compressive stiffness changes irregularly. Temperature is the determining factor of the ultimate load of the specimen, and the reducing extent of ultimate load increases with the temperature. When the temperature reaches 1000∘C, its maximum reducing extent exceeds 50%. Among the three parameters considered in this study, the duration of high temperature has the least influence on the specimen.

scholarly journals Numerical study and cellular instability analysis of E30-air mixtures at elevated temperatures and pressures

Fuel ◽  
2020 ◽  
Vol 271 ◽  
pp. 117458 ◽  
Author(s):  
Fushui Liu ◽  
Zechang Liu ◽  
Zheng Sang ◽  
Xu He ◽  
Magnus Sjöberg ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Numerical Study ◽  
Instability Analysis

Comparative Numerical Study between /Steel Fiber Reinforced Concrete and SIFCON on Beam-Column Joint Behavior

2021 ◽  
Vol 1021 ◽  
pp. 138-149
Author(s):  
Ali Wathiq Abdulghani ◽  
Abdulkhaliq A. Jaafer
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Shear Failure ◽  
Ultimate Load ◽  
Numerical Study ◽  
Load Capacity ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Steel Fiber Reinforced Concrete ◽  
Element Analysis

This paper presents a nonlinear finite element analysis of RC beam-column joints. A numerical study carried out through a simulation on beam-column joints failed in flexure presented by experimental study. A verification procedure was performed on two joints by finite element analysis with ANSYS APDL. The verification with the experimental work revealed a good agreement through the load-displacement relationship, ultimate load, and displacement, and crack pattern. Also, the parametric study was implemented which including strengthening the concrete members by a variable ratio of steel fibers with normal ratios (0.5%, 1%, 1.5%, and 2%) and ratios of slurry infiltrated fiber concrete SIFCON (steel fibers up to 4%, 6%, and 8%) in addition to using of partial and full strengthening with and without stirrups. The test results revealed that steel fibers enhanced the flexural strength and ductility of the tested joint. Increase the ratio of steel fibers increased the flexural capacity by (101%, 153%, 177%, and 193%) for the four normal ratios of steel fibers respectively. SIFCON concrete ratios (4%, 6%m and 8%) enhanced ultimate strength by (521%, 802%, and 906%) respectively. The use of steel fibers reinforcement instead of steel rebar enhanced the ultimate load capacity by (101%) with large displacement. Full strengthening method by use of SIFCON presented pure flexural failure with cracks spread in the joint region but use the SIFCON concrete as a partial strengthening changed the failure mode to the shear failure.

Performance of RC T-Beams Externally Strengthened with CFRP Laminates under Elevated Temperatures

2014 ◽  
Vol 5 (1) ◽  
pp. 1-24 ◽  
Author(s):  
Mohannad Naser ◽  
Rami Hawileh ◽  
Hayder Rasheed
Keyword(s):  
Parametric Study ◽  
Elevated Temperatures ◽  
Numerical Study ◽  
Experimental Testing ◽  
Fe Model ◽  
Cfrp Laminates ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Efficient Alternative ◽  
Fire Loading

This paper presents a numerical study that investigates the performance of reinforced concrete (RC) T-beams externally strengthened with carbon fibre reinforced polymer (CFRP) plates when subjected to fire loading. A finite element (FE) model is developed and a coupled thermal-stress analysis was performed on a RC beam externally strengthened with a CFRP plate tested by other investigators. The spread of temperature at the CFRP-concrete interface and reinforcing steel, as well as the mid-span deflection response is compared to the measured experimental data. Overall, good agreement between the measured and predicted data is observed. The validated model was then used in an extensive parametric study to further investigate the effect of several parameters on the performance of CFRP externally strengthened RC beams under elevated temperatures. The variables of the parametric study include applying different fire curves and scenarios, different applied live load combinations as well as the effect of using different insulation schemes with different types and thicknesses. Several observations and conclusions were drawn from the parametric investigation. It could be concluded that successful FE modeling of this structural member when exposed to thermal and mechanical loading would provide a valid economical and efficient alternative solution to the expensive and time consuming experimental testing.

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