Design Guide for SHS Concrete Filled Columns, Corus





INTRODUCTION

Structural Hollow Sections (SHS) are the most efficient of all structural steel sections in

resisting compression. Their availability in the high yield material Celsius 355 gives them a

high strength to weight ratio and produces slender attractive lines that make them a natural

choice for building structures. In addition, SHS can achieve a constant external dimension for

all weights of a given size, which enables them to achieve standardisation of architectural and

structural details throughout the full height of the building.

Celsius is the brand name for Corus Tubes hot-finished structural hollow sections, Celsius 355

being produced to the European Standard, EN 10210 S355J2H. Celsius sections are produced

by the electric weld process and the J2 denotation signifies that they have a Charpy impact

minimum average energy value of 27J at –20oC, making them suitable both for internal and

external applications. Celsius sections are produced to the technical delivery requirements of

EN 10210-1:1994

[1]

with dimensions and tolerances to EN 10210-2:1997

[2]

. However, for Celsius sections, there is an improved corner profile of 2T maximum.

By filling hollow sections with concrete a composite section is produced (see Figure 1.1), which

will increase the section’s room temperature load carrying capacity, whilst retaining all the

advantageous features of the basic unfilled section. Alternatively, for the same original load

capacity, it permits smaller composite sections to be used. The reduction in section size also

gives advantages in subsequent construction processes, including a reduced surface area for

painting or fire protection. In the fire condition the presence of the concrete filling acts as a heat

sink.


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