Blog 11 - Market forms of Steel

 

Structural Steel is mainly used for transferring the building loads. Structural Steel is available in market under various options, depending upon its intended use and implication in the building structure.

Market steel

Market steel is available in standard sizes and specifications. According to these specifications, the structural part of the building is designed. 

Here are the most common market forms of steel

Angle sections

  • L shaped equal or unequal angle sections
  • The sections are manufacture intact 90 degrees angles
  • e.g. 50x50x8 mm (depth x depth x thickness)
  • Used in frames

 

Channel Sections

  • C- shaped sections
  • Two equal flanges extending from one side with a longer web
  • Used in structural member of steel structures
  • Available Indian market sections are ISJC, ISLC, ISMC
  • (J-junior L-lightweight M-medium weight)

Corrugated Sheets

  • Corrugated steel is formed by passing the sheets through grooves
  • These corrugated sheets are galvanised iron sheets
  • Preferably used in roof covering

Flat Bars

Flat bars are panel- like steel forms available in thicknesses like 3mm to 40mm and 10mm to 400 mm wide

It is used in steel grill work for windows and gates

I-Sections

  • Rolled steel joists/ beams with two flanges and a web. e.g. 75x50 mm at 61 N
  • Similar beams with wide flanges are called as H-sections. E.g. 150x150 mm at 27N

Plates

  • Rolled steel flat beams of thicknesses varying from
    5mm to 50mm
  • Used to connect steel beams for extension of length and in steel trusses as tensile members



Ribbed Tor steel bars

  • Steel bars circular in cross section, ribbed on the surface 
  • Manufactured by cold twisting of hot rolled steel in a controlled manner

Round Bars 

  • Steel billets with circular cross-section of diameter varying from 5mm to 50mm
  • Used in reinforcement in steel grillwork and in concrete sections

Square Bars

  • Steel billets with square cross-section
  • Used in steel grillwork, windows, gates.
  • Available in sizes of 5mm x 5mm to 25mm x 25mm

T-Sections

  • Flange and web with unequal sides, bulbs at the bottom edge of the web.
  • Available in 20mm x 20mm x 3mm at 9 N/m (depth x depth x thickness)
  • Used in steel roof sections

Other market forms of steel include

  • Acute
  • Obtuse
  • Rail sections
  • Trough sections
  • Z- sections

As the session came to an end, we had a small discussion on Architecturally Exposed Structural Steel. The basic purpose of AESS is to fulfill the aesthetic and structural requirement of any structure. Some requirements that AESS is needed to have are shear and moment resistance, achieving a balance or symmetry, and meet the target under economic constraints. The opportunities found in the practice of AESS are Collaborative efforts of people from various fields, witnessing architecture of a different scale and language and much more. AESS and the standard steel differ in its function, surface treatment & appearance, joinery details and scale.



-  Janani Venkateswaran

No.of words - 475

Sources of images


Comments

Post a Comment

Popular posts from this blog

Steel Erection, Fabrication and Hybrid construction -Blog 16

Image
This blog is about how the steel sections are transported to the site, the issues involved with transportation, erection and fabrication along with the onsite constrains. TRANSPORTATION: The steel sections have to transported from the manufacturing site to the fabrication site and this becomes a tough task due to their size. Often large pieces cannot be transported in a single part, they are split or divided and shipped as two separate pieces or even as one piece to avoid damage or scratches. Temporary connections are made on the pieces to avoid damage and to keep the parts in place during transportation.     These parts are not transported in normal vehicles but require long trail vehicles to fit their length and size which again becomes a difficult task to turn around the corners of the road and at junctions     FABRICATION & ON SITE CONSTRAINS: Fabrication of steel on sites which are along the main road or at the corner site is very hectic as there is very...
Read more

BLOG-16 FABRICATION, ERECTION AND HYBRID STRUCTURES

Image
  FABRICATION: The process of  steel fabrication  involves grinding, welding, cutting, bending, drilling, punching, burning or melting and other general crafting methods using various high-quality tools and CNC equipment. ERECTION LIFTING, POSITIONING AND PLACING OF STEEL MEMBERS IN A STRUCTURE  Once the member(s) are lifted and placed in the required place, with the help of temporary supports and equipment, they are fastened and fixed, depending on the nature of connection.  Erections may be achieved by two techniques such as MEWP(Mobile Elevating Work Platforms) by Mobile crane and Tower cranes. HYBRID STRUCTURES Hybrid structures are structures built with composite materials a combination of different materials with steel. A common  hybrid system  consists of hollow core slabs together with steel or cast-in-situ concrete frames                       EXAMPLE STEEL WITH TIMBER     I...
Read more

STEEL , ALLOYS AND THEIR COMPARISON

Image
BLOG- 8                                     STEEL , ALLOYS AND THEIR COMPARISON                                                               STEEL AND ALLOYS                                               An alloy is a blend consisting of metal and other elements. Alloys are generally made for achieving properties like greater strength or resistance to corrosion. Steel is an alloy of iron. It mainly consists of iron with some small amounts of carbon. Definition ALLOY :      A homogeneous mixture of a metal with other types of elements                       ...
Read more