scholarly journals Ultimate strength capacity of a square hollow section filled with fibrous foamed concrete

2017 ◽  
Vol 271 ◽  
pp. 012103 ◽  
Author(s):  
Siti Amirah Azra Khairuddin ◽  
Norashidah Abd Rahman ◽  
Norwati Jamaluddin ◽  
Zainorizuan Mohd Jaini ◽  
Noorwirdawati Ali
Keyword(s):  
Ultimate Strength ◽  
Hollow Section ◽  
Strength Capacity ◽  
Foamed Concrete

scholarly journals EXPERIMENTAL STUDY ON BEHAVIOR OF UNPROTECTED FOAMED CONCRETE FILLED STEEL HOLLOW COLUMN UNDER FIRE

2021 ◽  
Vol 12 (2) ◽  
pp. 189-202
Author(s):  
Bishir Kado ◽  
Shahrin Mohammad ◽  
Yeong Huei Lee ◽  
Poi Ngian Shek ◽  
Mariyana Aida Ab Kadir
Keyword(s):  
Fire Resistance ◽  
Applied Load ◽  
Fire Test ◽  
Lightweight Concrete ◽  
Steel Tube ◽  
Load Level ◽  
Exposure Test ◽  
Hollow Section ◽  
High Rise ◽  
Foamed Concrete

Reduction in self-weight and achievement of full fire resistance requirements are some of the important considerations in the design of high-rise structures. Lightweight concrete filled steel tube (CFST) column provides an alternative method to serve these purposes. Recent studies on lightweight CFST columns at ambient temperature have revealed that foamed concrete can be a beneficial and innovative alternative material. Hence, this study investigates the potential of using foamed concrete in circular hollow steel columns for improving fire resistance. A series of nine fire test on circular unfilled hollow and foamed concrete filled hollow section column were carried out. ISO 834 standard fire exposure test were carried out to investigate the structural response of these columns under fire. The main parameters considered are load level and foamed concrete density; foamed concrete density used are 1500 kg/m3 and 1800 kg/m3 at 15%, 20%, and 25% load level. All the columns tested are without any external fire protection, with concentrically applied load under fixed-fixed boundary conditions. The columns dimension was 2400 mm long, 139.7 mm diameter and steel tube thickness of 6 mm. The fire test result showed that foamed concrete increases the fire resistance of steel hollow column up to an additional 16 minutes. The improvement is more at load level above 15%, and the gain in fire resistance is about 71% when 1500 kg/m3 density foamed concrete is used. Generally, foamed concrete filled steel hollow column demonstrate a good structural fire behavior, based on the applied load and foamed concrete density. Also, inward local buckling was averted by filling the steel hollow column with foamed concrete. General method for composite column design in Eurocode 4 adopted to calculate the axial buckling load of 1500 kg/m3 foamed concrete filled columns.  These type of columns can be used for structures like airports, schools, and stadiums; taking the advantage of exposed steel for aesthetic purpose and high fire resistance. It can also be used for high rise structures; taking advantage of high fire resistance and reduction in self-weight of a structure.

Static Strenght of Doubler Plate Reinforced Tubular K-Joints under Bending Load

2012 ◽  
Vol 166-169 ◽  
pp. 645-648
Author(s):  
Wei Ning Sui ◽  
Xin Long Zhang ◽  
Guo Chang Li ◽  
Xue Bai
Keyword(s):  
Ultimate Strength ◽  
Static Strength ◽  
Geometric Parameters ◽  
Hollow Section ◽  
Numerical Studies ◽  
Bending Load ◽  
Circular Hollow Section

Abstract: In order to study static strength of doubler plate reinforced circular hollow section (CHS) K-joints, experimental and numerical studies conducted by the authors. The effects of parameters Δ (the ratio between the length of doubler plate and the diameter of the brace) and α (the width of the doubler plate) on CHS K-joints subjected to bending load have been investigated and reported by the authors. It is found that the ultimate strength of a CHS K-joints reinforced with appropriately proportioned doubler plates can be up to 2 ratio to its un-reinforced counterpart. Reasonable geometric parameters of the doubler plate can make the chord, brace and doubler plate work together to bear the external bending load. The width and length parameter of the doubler plate, however, have no effect on the stiffness of the reinforced K-joints.

scholarly journals Experimental analysis of a mechanical shear connector in concrete filled steel tube column

2017 ◽  
Vol 10 (3) ◽  
pp. 592-625
Author(s):  
J. G. R. NETO ◽  
A. M. SARMANHO
Keyword(s):  
Steel Tube ◽  
Outer Diameter ◽  
Shear Connector ◽  
Hollow Section ◽  
Composite Columns ◽  
Shear Connectors ◽  
Strength Capacity ◽  
Hole Dimension ◽  
Circular Hollow Section ◽  
Bolt Diameter

ABSTRACT This work includes an analytical and experimental study of the structural behavior of shear connectors in composite columns, composed of concrete-filled circular hollow section. For this study was adopted a structural bolt like a shear connector in order to verify the validity of the analytical expressions in ABNT NBR 16239: 2014 [1]. Was carried out a series of push-out tests, fixing the outer diameter of the hollow section and varying the thickness, the bolt diameter, the strength of concrete and the hole dimension. Analysis of the results shows that is possible to use this type of shear connector. The Brazilian prescriptions results are conservative and may be adjusted to provide strength capacity value closest to the experiment.

scholarly journals Mechanical Testing of Recycled HDPE Extruded Hollow Section

2020 ◽  
Vol 4 (2) ◽  
pp. 112-121
Author(s):  
Greg Wheatley ◽  
Rendage Sachini Sandeepa Chandrasiri
Keyword(s):  
Thermal Expansion ◽  
Yield Strength ◽  
Ultimate Strength ◽  
Modulus Of Elasticity ◽  
Coefficient Of Thermal Expansion ◽  
Linear Thermal Expansion ◽  
Environmental Benefits ◽  
Hollow Section ◽  
Significant Difference ◽  
Recycled Hdpe

High density polyethylene (HDPE) is a thermoplastic polymer which is classified as one of the highly consumed types of plastics. One major advantage of thermoplastic materials is their ability of recycling and reprocessing which will bring considerable economicand environmental benefits. The present paper, therefore, endeavours to explore the practical possibility of using recycled HDPE hollow section as a replacement of virgin HDPE made by the extrusion process. The main focus of the study was to evaluate the mechanical performance of the recycled HDPE and compare the results with virgin or non-recycled HDPE.  The modulus of elasticity, tensile yield and ultimate strength, compressive yield and ultimate strength, flexural yield and ultimate strength and the coefficient of thermal expansion were the main parameters to be checked against the respective mechanical properties. Thus, pursuant to the rsults, it was found out  that the modulus of elasticity and the tensile yield strength are lower in recycled HDPE compared to the non-recycled HDPE. However, there is no significant difference between the recycled and non-recycled HDPE for the tensile ultimate strength, compressive yield strength and compressive ultimate strength. The flexural yield strength and flexural ultimate strength properties of the recycled HDPE proved to be superior to those of the non-recycled HDPE. The coefficient of linear thermal expansion of the recycled HDPE sample was 130 μm/(m.°C) and that for the non-recycled HDPE was 142 μm/(m.°C).

Experimental Study on Ultimate Strength of Thin-Walled Square Tube Under Axial Compression

2019 ◽  
Author(s):  
Hanwei Zhou ◽  
Ling Zhu ◽  
Shengming Zhang ◽  
T. X. Yu
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Aspect Ratio ◽  
Ultimate Strength ◽  
Axial Compression ◽  
Small Aspect Ratio ◽  
Aspect Ratios ◽  
Strength Capacity ◽  
Thin Walled

Abstract There are many welded thin-walled square tube structures in ship structures. At present, researchers are mainly involved in axial compressive ultimate strength of square tubes with large aspect ratios. However, the study of square tubes with small aspect ratios on ultimate strength capacity have seldom been conducted. In order to study the ultimate strength capacity of thin-walled square tubes with small aspect ratio under axial compression, three welded thin-walled square tubes with different slenderness ratios were manufactured and studied in this paper. The ultimate strength of those models under axial compression were obtained experimentally. The experimental results were compared with numerical results performed by ABAQUS. The influence of slenderness ratios on the axial compressive ultimate strength of thin-walled square tubes is analyzed, and a feasible modelling of finite element method is proposed.

scholarly journals Strength of Reinforced Reactive Powder Concrete Hollow Beams

2019 ◽  
Vol 26 (2) ◽  
pp. 15-22
Author(s):  
Mazin Abdulrahman ◽  
Saba Mahmood
Keyword(s):  
Concrete Strength ◽  
Reactive Powder Concrete ◽  
Load Carrying Capacity ◽  
Hollow Section ◽  
Hollow Beam ◽  
Strength Capacity ◽  
Load Carrying ◽  
Concentrated Loading ◽  
Reactive Powder ◽  
Hollow Beams

The main objective of this research is to investigate the structural behavior and strength of reinforced reactive powder concrete beams with a hollow section subjected under two point concentrated loading. The experimental work consist of ten beams with dimensions (150mm width×200mm height×1000 mm length), eight of them are hollow beams and two solid beams were cast and tested up to failure. The major parameters adopted in the current research includes the hollowness ratio (10% and15%), hollow location (at top or at bottom), and hollow shape (circle or square). The amount of longitudinal and transverse reinforcement, concrete strength and the other parameters were kept constant for all the specimens. The comparisons between all specimens (hollow and solid) are based on the load carrying capacity, deflection, crack pattern and mode of failures. Results showed that the strength capacity of hollow beam when the hollow lies in the bottom is much higher than for top hollow, and the square hollow will lead to more decrease in the beam strength compared with the circular hollow and this is more evident when the hollowness ratio increases from (10% to 15%).

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