scholarly journals CUMULATIVE DEFORMATION CAPACITY AND STRUCTURAL DUCTILITY FACTOR OF CIRCULAR HOLLOW SECTION STEEL BRACED FRAMES WITH DIFFERENT DIAMETER THICKNESS RATIO

2017 ◽  
Vol 82 (739) ◽  
pp. 1485-1495 ◽  
Author(s):  
Yuki TERAZAWA ◽  
Ryota MATSUI ◽  
Takeshi NAKAMURA ◽  
Toru TAKEUCHI
Keyword(s):  
Thickness Ratio ◽  
Deformation Capacity ◽  
Braced Frames ◽  
Hollow Section ◽  
Ductility Factor ◽  
Cumulative Deformation ◽  
Circular Hollow Section

Axial strength of steel circular hollow section (CHS) X-joints strengthened by flanged larger pipe

2020 ◽  
Vol 47 (3) ◽  
pp. 301-316
Author(s):  
Peter Gerges ◽  
Sameh Gaawan ◽  
Ashraf Osman
Keyword(s):  
Finite Element ◽  
Parametric Study ◽  
Thickness Ratio ◽  
Finite Element Models ◽  
T Joints ◽  
Hollow Section ◽  
Axial Strength ◽  
Structural Joints ◽  
Circular Hollow Section ◽  
Steel Design

In steel design, enhancing the structural joints’ capacity is considered a challenge that faces the designer. This challenge becomes more difficult when it comes to enhancing the capacities of circular hollow section (CHS) joints due to their closed nature that complicates the strengthening process. Recent research related to strengthening T-joints by utilizing two outer hollow ring flanges welded to additional pipe showed that this technique can significantly improve the joints’ strength. In this study, the utilization of this technique is extended for enhancing the axial strength of CHS X-joints. In this regard, a parametric study using finite element models was carried out to investigate the different design aspects that might affect the behavior of strengthened X-joints. The examined parameters included, the ring flange diameter, the stiffening pipe thickness and length for different brace diameter-to-chord diameter ratios and chord diameter to double chord thickness ratio. The results demonstrated that these strengthened X-joints gained significant axial strength that reached up to three times the axial strength of the unstrengthened joints. Guidelines for proper detailing of such strengthening scheme were provided. Finally, an equation that estimates the axial strength of strengthened joints was established based on the achieved results.

scholarly journals Stress Concentration Factors (SCFs) in Circular Hollow Section CHS-to-H-shaped Section Welded T-Joints under Axial Compression

2019 ◽  
Vol 5 (1) ◽  
pp. 33 ◽  
Author(s):  
Abderlahman Ismaeel Hamdan
Keyword(s):  
Stress Concentration ◽  
Axial Compression ◽  
Welded Joints ◽  
Thickness Ratio ◽  
Geometrical Parameters ◽  
Hollow Section ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Circular Hollow Section ◽  
Shaped Section

The aim of this paper is to investigate the effects of non-dimensional geometric parameters on stress concentration factors (SCFs) of circular hollow section CHS brace-to-H-shaped section T-connections under axial compression. This type of welded joints is used increasingly in steel construction. However, its fatigue design is not covered by codes, and its fatigue strength has not been given the deserved attention by researchers.  This research, however, bridges the gab on SCFs in this type of welded connections when being loaded in axial compression. here, parametric study based on the numerical analysis was performed to evaluate the effect of CHS brace diameter to H-shaped chord flange width ratio (β), H-shaped chord flange width to thickness ratio (2γ) and CHS brace thickness to H-shaped chord flange thickness ratio (τ) on SCFs in the brace and the chord of the connection. Based on practical considerations, the validity range of these parameters was 0.3 ≤ β ≤ 0.7, 16 ≤ 2γ ≤ 30 and 0.2 ≤ τ ≤ 0.1. Three-dimensional finite element (FE) study using commercial software ABAQUS was performed to study the hot spot stress distribution and hence SCFs in this type of welded joints. To begin with, the results of FEM were verified against available experimental data and good agreement was achieved. Afterwards, 48 joints were modeled in Abaqus to study the effect of geometrical parameter on SCFs in brace and chord. Based on the results of this extensive study, the effect of geometrical parameters was revealed. The paper, thus, shows that whilst β increases, SCFs in the brace and chord increases. Moreover, increasing the parameter 2γ results in an increase in SCFs in the two members. However, the change in τ has no significant effect on the SCFs in the brace or the chord. Values of SCFs are found to be between 2 and 7.

scholarly journals Durability of CFRP strengthened steel circular hollow section member exposed to sea water

2016 ◽  
Vol 118 ◽  
pp. 216-225 ◽  
Author(s):  
M.H. Kabir ◽  
S. Fawzia ◽  
T.H.T. Chan ◽  
M. Badawi
Keyword(s):  
Sea Water ◽  
Hollow Section ◽  
Circular Hollow Section

A Review of Prestressed Concrete Pile with Circular Hollow Section (Spun Pile)

2015 ◽  
Vol 72 (5) ◽  
Author(s):  
Candra Irawan ◽  
Priyo Suprobo ◽  
I Gusti Putu Raka ◽  
Rudy Djamaluddin
Keyword(s):  
Prestressed Concrete ◽  
Seismic Loads ◽  
Longitudinal Reinforcement ◽  
Research Topics ◽  
Earthquake Loads ◽  
Hollow Section ◽  
Failure Patterns ◽  
Concrete Pile ◽  
The World ◽  
Circular Hollow Section

Spun pile is one of the types of piles are widely used in the world construction, for example in building and bridge. Spun pile is a prestressed concrete pile with circular hollow section. This paper provides an overview of the research development of spun pile, starting from 80's until now. This overview is related to methods of increasing the strength and reliability of spun pile due to earthquake loads, either by modifying the longitudinal reinforcement and confinement. In addition, this paper also discusses about the failure patterns of spun pile due to seismic loads. Finally, this paper can be a reference for understanding the scope of the research topics that have been done by researchers. Thus, by this overview can be obtained new idea for the next research to improve the performance of spun pile carry seismic loads.

To fire resistance of the steel and fibre-reinforced concrete circular hollow section column

2017 ◽  
pp. 73-79
Author(s):  
Tretyakov Alexey ◽  
Tkalenko Illia ◽  
Wald František ◽  
Novak Josef ◽  
Stefan Radek ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Fire Resistance ◽  
Fibre Reinforced Concrete ◽  
Hollow Section ◽  
Circular Hollow Section
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