Shear lag in slotted HSS tension members

1996 ◽  
Vol 23 (6) ◽  
pp. 1350-1354 ◽  
Author(s):  
R. M. Korol
Keyword(s):  
Reduction Factor ◽  
Shear Lag ◽  
Distance Ratio ◽  
Gusset Plates ◽  
Braced Frame ◽  
Factor Design ◽  
Frame Construction ◽  
Tension Members ◽  
Hollow Structural Section ◽  
Hollow Structural Sections

A research program was undertaken to study the shear-lag phenomenon for slotted hollow structural section (HSS) tension members having gusset plates welded at the ends, a commonly employed detail in braced frame construction. The purpose of this study was to establish whether the shear-lag reduction factor indeed involves only the weld length to weld distance ratio, or if other parameters also influence connection strength and behaviour. Key words: shear lag, slotted members, reduction factor, design, experiments, hollow structural sections.

Strength of slotted tubular tension members

1998 ◽  
Vol 25 (6) ◽  
pp. 982-991 ◽  
Author(s):  
J J. Roger Cheng ◽  
G L Kulak ◽  
Heng-Aik Khoo
Keyword(s):  
Equivalent Plastic Strain ◽  
Experimental Program ◽  
Shear Lag ◽  
Element Analysis ◽  
Gusset Plates ◽  
Gusset Plate ◽  
Lag Effect ◽  
Load Carrying ◽  
Tension Members ◽  
Hollow Structural Section

An experimental program and associated numerical analysis were undertaken to study the shear-lag effect in round hollow structural section (HSS) tension members that are welded to gusset plates at their ends. The connection is made by slotting the tube longitudinally, inserting the gusset plate, and then placing longitudinal fillet welds at the tube-gusset interface. A total of nine specimens with three different tube sizes (HSS 102 × 6.4, HSS 102 × 4.8, and HSS 219 × 8.0) and various weld lengths were tested in the program. Most of the specimens failed by fracture of the tube somewhere between the two gusset plates, and there was considerable ductility prior to fracture. Most importantly, there was no reduction in the effective net area for the tested specimens, even with a weld length as little as 80% of the distance between the welds. Numerical analyses of the connections were carried out using an elastoplastic model and measured material properties. The studies showed that the restraint provided by the gusset plate at the slotted end effectively increases the load-carrying capacity of the tube as compared with that of the unrestrained portion of the member. In the analysis, fracture is assumed to have occurred when the equivalent plastic strain reaches a critical value. The test results are discussed in light of the requirements in the Canadian standard for design of steel structures.Key words: connections, steel, shear lag, finite element analysis, gusset plates, hollow structural section, tension, welds.

Analytical approach for shear lag in welded tension members

2006 ◽  
Vol 33 (4) ◽  
pp. 384-394 ◽  
Author(s):  
Georges Abi-Saad ◽  
Dominique Bauer
Keyword(s):  
Laboratory Tests ◽  
Analytical Approach ◽  
Steel Structures ◽  
Ultimate Stress ◽  
Shear Lag ◽  
Gusset Plates ◽  
Lag Effects ◽  
Elastic Plastic ◽  
Tension Members ◽  
Longitudinal Welds

The authors propose an analytical approach for calculating the reduction in strength of steel tension members due to shear lag effects. The approach is based on an assumed distribution of forces along inclined lines in the member ends, somewhat similar to the Whitmore concept used with gusset plates for bracing members. The method is demonstrated for a basic weld in shear at elastic, plastic, and ultimate stress levels. The method is then compared with the recommendations contained in standard CAN/CSA-S16-01 for elements connected by a single longitudinal weld and for elements connected by longitudinal welds along two parallel edges. The predicted strength of tension members with welded connections is compared with results from several laboratory tests. The proposed method could be used for calculating the reduction in strength due to shear lag effects of tension members with different sections.Key words: steel structures, trusses, tension members, welded connections, shear lag, Whitmore.

The Effect of Weld Length on the Tension Capacity of Hollow Structural Section (HSS)

2020 ◽  
pp. 42-58
Keyword(s):  
Cross Section ◽  
Uniform Stress ◽  
Entire Cross Section ◽  
Design Strength ◽  
Minimum Requirement ◽  
Tension Member ◽  
Hollow Structural Section ◽  
Hollow Structural Sections ◽  
Tension Capacity ◽  
Steel Standard

The non-uniform stress distribution occurs in a tension member adjacent to a connection, in which all elements of the cross-section are not directly connected. This effect reduces the member’s design strength because the entire cross-section is not fully effective in the critical section’s location. That's why an experimental study has been done to investigate the effect of the weld length on the tension capacity, two specimens (hollow structural sections) have been tested by using Instron 8800 machine with two weld lengths, 46 mm and 56 mm. The 46 mm size is the minimum requirement of the sufficient size of the tension connection depending on United States Steel Standard. The Result proved that there has been too much effect on the connection carrying tension capacity. The result of the 46 mm weld length is about 155 KN and about 180 KN for the 56 mm weld length. While the ABAQUS simulation results were about 168 KN for the 46 mm weld length and about 172 KN for the 56 mm weld length.

Calculation of the fire resistance of steel hollow structural section columns filled with plain concrete

1994 ◽  
Vol 21 (3) ◽  
pp. 382-385 ◽  
Author(s):  
T. T. Lie ◽  
D. C. Stringer
Keyword(s):  
Mathematical Models ◽  
Key Words ◽  
Fire Resistance ◽  
Experimental Studies ◽  
Plain Concrete ◽  
Building Codes ◽  
Aggregate Concrete ◽  
Parametric Studies ◽  
Hollow Structural Section ◽  
Hollow Structural Sections

Experimental studies were conducted to determine the fire resistance of circular and square hollow structural section columns filled with plain concrete. Mathematical models were developed and used to investigate the influence of important parameters that determine the fire resistance of these columns. The experimental and parametric studies provide information for the development of formulas for the calculation of the fire resistance of circular and square concentrically loaded columns filled with plain carbonate or siliceous aggregate concrete. Such formulas are suitable for incorporation into building codes. Key words: calculation, fire resistance, columns, concrete-filled, steel, hollow structural sections.

Investigation of shear-lag in slotted HSS tension members

2021 ◽  
pp. 473-479
Author(s):  
R.M. Korol ◽  
F.A. Mirza ◽  
M.Y. Mirza
Keyword(s):  
Shear Lag ◽  
Tension Members

The shear lag effects on welded steel single angle tension members

2009 ◽  
Vol 65 (5) ◽  
pp. 1171-1186 ◽  
Author(s):  
H.T. Zhu, ◽  
Michael C.H. Yam ◽  
Angus C.C. Lam ◽  
V.P. Iu
Keyword(s):  
Shear Lag ◽  
Welded Steel ◽  
Lag Effects ◽  
Tension Members

scholarly journals Nuts & Bolts: An exploration of design for deconstruction and component re-use in engineered timber construction

2021 ◽  
Author(s):  
◽  
George Strang
Keyword(s):  
Circular Economy ◽  
Small Scale ◽  
Component Reuse ◽  
Braced Frame ◽  
Timber Products ◽  
Single Use ◽  
Frame Construction ◽  
Design Proposal ◽  
Connection Design ◽  
Construction System

<p><b>This research is fuelled by the ever-increasing impact of global pollution and climate change, and the role the construction industry plays in it. Vast amounts of construction waste, needless manufacturing of single-use and composite products, and poor construction practices culminate in a linear economy model on which the world operates. It is a problem that can no longer be ignored and must be rectified. This research aims to develop and propose a construction system suitable for deconstruction and continued component reuse, using engineered timber products available in today’s market. The system will be tested against several implementations across a variety of building scales. This research has the intention of enabling component reuse for a circular economy. A circular economy minimises waste produced. Less waste is good.</b></p> <p>The resulting design proposal is a modular and prefabricated braced frame construction system to suit large and small scales, with removable foundations and adaptive spatial planning. Effective separation of building layers is achieved to allow for access, maintenance, and simple disassembly. Traditional Japanese timber joining techniques have also been researched and used to influence component connection design for deconstruction. This research eliminates irreversible fixings such as adhesives, nails, and screws. The system is then tested across commercial, residential, and small-scale implementations to test its feasibility.</p> <p>It will serve as a case study that questions how we think of buildings and value their components. It aims to enable the same components to be useful across multiple building scales, minimising redundancy and waste.</p>

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