STEEL STRUCTURES ‐DESIGN OF THE JOINTS

Design of structures 2020/2021

SESSION T21 1/22STEEL STRUCTURES ‐ DESIGN OF THE JOINTS

Weldedjoints

Boldedjoints:

between beams

beam / column

between columns

tubular profiles

column bases

Rivetedjointsandjointswithconnectors


STEEL STRUCTURES ‐ DESIGN OF THE JOINTS

Shouldweusewelded/boldedconnections?

In the workshop > Welded connections with appropriate quality control tests

On site > Standard or preloaded bolded connections

SESSION T21 2/22



WeldedjointbetweenHprofiles

WeldedjointbetweenI– Hprofiles

SESSION T21 3/22



WeldedRHSjoint

SESSION T21 4/22

WeldedCHSjoint



Stadiumroofs

Trainstations

SESSION T21 5/22



TypicalweldedjointbetweenCHSprofiles

Bridgesandoffshorestructures

SESSION T21 6/22



BoltedjointsbetweenelementsBoltedjointbetweenbeams

SESSION T21 7/22



Boltedjointbetweenbeams/columns

Bolted/weldedjointbetweenbeams/columns

SESSION T21 8/22

Boltedjointsbetweenelements



Boltedjointbetweenbeams/tubularcolumns

Rigidorflexible?

SESSION T21 9/22

Boltedjointsbetweenelements



Boltedjointswith“gousset”plates

SESSION T21 10/22



Boltedjointbetweenbeams/columnwithtopplates Semi‐ Rigid

SESSION T21 11/22

Rigidorflexible?


Rigidorflexible?


Boltedjointbetweenbeams/columnwithtopplates

SESSION T21 12/22



Boltedjointofabeam+bracingelement

SESSION T21 13/22



Boltedjointofacastellatedbeam/column

SESSION T21 14/22



Bolted connection between steel-concrete composite beam joints

SESSION T21 15/22



Boltedconnectionintubularprofiles– flangejoint,withcoverplatesandwithTconnectionplates

SESSION T21 16/22



Columnbasesjoints

SESSION T21 17/22


STEEL STRUCTURES ‐ DESIGN OF THE JOINTSSESSION T21 18/22

Columnbasesjoints– perfectlypinconnections



Beamtocolumnjoint– Whicharethepreferabledetails?Thesimplestthebetter!

SESSION T21 19/22



RivetedjointsSteel‐concretejointwithconnectors

SESSION T21 20/22



Summary:1) Welded or bolted connections are two possibilities - it is more advisable to adopt welded

connections made in the workshop and bolted connections on site

2) Joints must be simple and easy to execute both in the workshop and on site - good structural performance should be assured but also the required execution quality

3) Fully welded connections will always be rigid joints

4) Bolted connections will be more or less flexible depending on the allowable bending / joint rotation capacity

5) The design of the connections must take into account: a) the requirements in terms of structural performance, b) the design carried out for the elements (end restrained or pinned supports), and c) the stiffness and strength criteria the structure should meet

SESSION T21 21/22



Summarycomparisonbetweenweldedandscrewconnections

Criteria Welded joints Bolted joints

Deformability Very rigid (usually do not contribute to the deformability of the structure)

They can contribute considerably to the deformability of the structure (in particular, when using non prestress bolted joints)

Execution Preferable on workshop They can be executed both in a workshop or on site; less demand in terms of labour specialization

Aesthetics “Simple” connections, compact and with reduced visual impact

Connections with greater visual impact, with a more “industrial” aspect

Dismantling Difficult operation, usually requiring the need to cut elements

It is not required to cut elements (important aspect if it is intended that the structure can be erected elsewhere)

SESSION T21 22/22

Documents

STEEL STRUCTURES ‐DESIGN OF THE JOINTS