Approaches to determine the ultimate strength and failure mechanisms of RC short columns retrofitted by FRP

2016 ◽  
Vol 22 (11) ◽  
pp. 1364-1373 ◽  
Author(s):  
K. Le Nguyen ◽  
M. Brun ◽  
A. Limam ◽  
E. Ferrier
Keyword(s):  
Ultimate Strength ◽  
Failure Mechanisms ◽  
Short Columns

Experimental study on the effect of flange geometry on the shear strength of reinforced concrete T-beams subjected to concentrated loads

2002 ◽  
Vol 29 (6) ◽  
pp. 911-918 ◽  
Author(s):  
Craig Giaccio ◽  
Riadh Al-Mahaidi ◽  
Geoff Taplin
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Shear Strength ◽  
Reinforced Concrete ◽  
Ultimate Strength ◽  
Failure Mechanisms ◽  
Shear Resistance ◽  
Strength Failure ◽  
Effective Depth ◽  
T Beam

This paper presents results of an experimental investigation into the effect of flange geometry on the shear strength of point-loaded, reinforced concrete T-beams. A procedure to normalise the ultimate strength and calculate a concrete contribution is implemented. This is used to discuss the effect of varying the ratio of flange width to web width and the ratio of flange depth to effective depth on the shear strength of a reinforced concrete T-beam. An increase in the ratio of flange width to web width is shown to produce an accompanying increase in the ultimate strength of a reinforced concrete T-beam, providing the ratio of flange depth to effective depth is above a certain minimum value. This increase in shear resistance with an increase in the ratio of flange width to web width continues until the flange is wide enough to allow formation of a failure mechanism whereby the load point punches through the flange.Key words: shear, T-beams, flange, reinforcing, strength, failure mechanisms.

NUMERICAL EVALUATION OF CONCRETE FILLED STAINLESS STEEL TUBE FOR SHORT COLUMNS SUBJECTED TO AXIAL COMPRESSION LOAD

2018 ◽  
Vol 80 (2) ◽  
Author(s):  
Azrul Abd Mutalib ◽  
Mohamed Hamza Mussa ◽  
Khaleel Mohammad Khaleel Abusal
Keyword(s):  
Stainless Steel ◽  
Ultimate Strength ◽  
Ultimate Load ◽  
Load Capacity ◽  
Concrete Strength ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Steel Tubes ◽  
Ultimate Load Capacity ◽  
Short Columns

Recently, the concrete filled stainless steel tubes (CFSST) columns are widely applied in modern construction due to its aesthetic appearance, high corrosion resistant and less construction cost. The current study aims to evaluate the behavior of CFSST column with square hollow section (SHS) numerically under axial compressive load by using ABAQUS software. A good consistency had achieved between the numerical and experimental test results in terms of load-displacement behaviour and ultimate strength with a maximum difference equal to 2%. Intensive parametric studies had been conducted to determine the effects of stainless steel tubes and concrete properties on the ultimate load capacity of CFSST column. The results proved that the stainless steel tube thickness (t) capable to increase the strength of column by143.59% at t = 10 mm as compared with t = 2 mm, whereas a slight effect had observed for the variation of stainless steel proof stress ( ). On the other hand, the higher values of concrete strength (fc′) obviously reduced the lateral expansion of CFSST column at initial load and led to increase the ultimate load capacity by 34.18 % at fc′ = 80 MPa as compared with  fc′ = 30 MPa. Furthermore, the design strengths calculated according to the Eurocode 4 for concrete filled steel tube (CFST) column appeared a good agreement with the numerical results within an average difference value 2.49%, hence, it could consider as the most rational design method to determine the ultimate strength of CFSST column.

Effective design width for perforated cold-formed steel compression members

1998 ◽  
Vol 25 (2) ◽  
pp. 319-330 ◽  
Author(s):  
Nabil Abdel-Rahman ◽  
K S Sivakumaran
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Ultimate Strength ◽  
Experimental Studies ◽  
Element Model ◽  
Short Columns ◽  
Compression Members ◽  
Assumed Strain ◽  
Cold Formed Steel ◽  
Effective Design

Perforations are often provided in the web and (or) flange plates of beams and columns of cold-formed steel (CFS) structural members in order to facilitate duct work, piping, and bridging. This paper is concerned with the establishment of effective design width equations for the determination of the ultimate strength of such perforated members in compression. A proven finite element model has been used to study the effects of perforation parameters on the ultimate strength of perforated members. The finite element model consists of short columns of lipped channel CFS sections, discretized using nonlinear "assumed strain" shell finite elements, and utilising experimental-based material properties models. The parametric study covers web slenderness values between 31 and 194, perforation width to web width ratios up to 0.6, and perforation height to perforation width ratios up to 3.0. Effective design width equations for plates having square perforations and elongated perforations were developed. The efficiency and accuracy of these two equations in predicting the ultimate strength of perforated CFS compression members have been verified through a comparison with the ultimate load results of several experimental studies from the literature.Key words: cold-formed steel, compressive loads, local buckling, perforations, finite element analysis, experimental, post-buckling strength, ultimate strength, effective width, design.

Study on shear failure mechanisms of reinforced concrete short columns

1990 ◽  
Vol 35 (1-3) ◽  
pp. 277-289 ◽  
Author(s):  
Yashiro Harumi ◽  
Tanaka Yasuo ◽  
Nagano Masayuki ◽  
Ro Younggon
Keyword(s):  
Reinforced Concrete ◽  
Shear Failure ◽  
Failure Mechanisms ◽  
Short Columns

scholarly journals Behavior of High Strength Reinforced Concrete Hollow Circular Short Columns under Axial Loads

2019 ◽  
Vol 12 (3) ◽  
pp. 95-102
Author(s):  
Ghzwan Ghanim Jumah
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Strength ◽  
High Strength ◽  
Steel Reinforcement ◽  
Outer Diameter ◽  
Hole Size ◽  
Longitudinal Reinforcement ◽  
Axial Loads ◽  
Circular Column ◽  
Short Columns

This work deals with investigating the capacity of high strength columns, under axial compression loads. A total of nine circular column with 600 mm length and 150 mm outer diameter were tested, three of them were solid as a reference, the remaining six columns were with internal hole of 50 and 75 mm dimeter. The effect of hole size as well as area of longitudinal steel reinforcement was studied. Area of steel used where 0, 301 and 471 mm2 and two hole size were 50 and 75 mm. The results showed that the increasing of longitudinal reinforcement ratio from 0 % (plain) to 2.67% (steel reinforcement area of 471 mm2) for solid column cause an increase in the ultimate strength by 33.6%, while for hollow columns with 75 mm internal hole the ultimate strength increased up to 33.2 %. Increase in hole dimeter from 50 to 75 mm caused a reduction of columns capacity in all cause, the decrease was up 33 % for columns with 301 mm2 steel area was up to 32 %, for columns with 417 mm2

On the role of tin underlays for the prevention of thermal grooving in thin gold films

1986 ◽  
Vol 44 ◽  
pp. 732-733
Author(s):  
Jin Young Kim ◽  
R. E. Hummel ◽  
R. T. DeHoff
Keyword(s):  
Thin Film ◽  
Free Surface ◽  
Grain Boundary ◽  
Beneficial Effect ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Distinct Advantage ◽  
Gold Films ◽  
Gold Thin Film

Gold thin film metallizations in microelectronic circuits have a distinct advantage over those consisting of aluminum because they are less susceptible to electromigration. When electromigration is no longer the principal failure mechanism, other failure mechanisms caused by d.c. stressing might become important. In gold thin-film metallizations, grain boundary grooving is the principal failure mechanism.Previous studies have shown that grain boundary grooving in gold films can be prevented by an indium underlay between the substrate and gold. The beneficial effect of the In/Au composite film is mainly due to roughening of the surface of the gold films, redistribution of indium on the gold films and formation of In2O3 on the free surface and along the grain boundaries of the gold films during air annealing.

Sign in / Sign up

Export Citation Format

Share Document