Rolled steel sections and Types used in civil engineering? Steel members ISLB, ISMB, ISLC ISNT

Rolled steel sections are the steel members are subjected to high temperature and then pressed from the series of rollers to make the required shape and cross section of the members are called as rolled steel sections. Depending upon the requirements in the construction industries the steel members are made in the factories. Examples are I sections, C sections, T Sections, L sections. These steel sections are used the steel structures mainly factories, warehouses,  workshops, etc.

Types of rolled steel sections used in civil engineering

Depending upon the various uses in the construction industry the steel sections are classified in to the following 9 classes they are

1. I Section
2. Channel Section
3. T Section
4. Steel angle Section
5. Steel hallow (or) Tube Section
6. Steel Flat Section
7. Steel Plate Section
8. ISRO
9. ISSQ

1. Rolled steel I section

The steel I section is used as the beams and columns in the structures. The web and beam junction is known as the flat (or) roof. The main advantage of  steel I section is to minimize the stress concentration. The maximum height of the I section is available with h=600mm now a days. The design of steel I section is based on the total depth and the self weight of the member.

There are five series of I sections they are

1. ISLB – Indian Standard Light weight beams
2. ISMB – Indian Standard medium weight beams
3. ISHB- Indian Standard heavy weight beams
4. ISWB-Indian Standard wide flange beams
5. ISJB-Indian Standard wide flange beams

The ISLB sections are used in the roofs where the loads on the structure are less, ISMB used in the frames or floor beams, ISHB sections are used in the columns, ISWB sections are used in the gantry girders and ISJB are used in the Intel constructions.

2. Steel Channel section

The Steel channel sections are mainly used as the purlins in the industrial buildings. The design is similar to rolled steel I section by considering total depth and self weight.

There are four series of channel sections they are

1. ISLC – Indian Standard Lower weight channel
2. ISMC – Indian Standard medium channel
3. ISJC-Indian Standard junior channels
4. ISSC- Indian Standard column sections

3. Rolled steel T section

The rolled T section is shown in the below figure design of the rolled  T Section is based on the total depth and self weight of the member. Generally the rolled steel T sections are used in columns  (compression members).

There are four series of T sections they are

1. ISNT – Indian Standard Normal T beams
2. ISDT – Indian Standard deep legged T beams
3. ISJT-Indian Standard junior T beams
4. ISLT- Indian Standard light T beams

4. Rolled steel angle section

The section of angle section is shown in the below section, the design of angle section is based on the leg sizes and the thickness of the member. Generally these sections are used in the roof truss constructions and transmission towers.

There are three series of T sections they are

1. Equal angle – (Example ISA100X100X10)
2. Un equal angle – (Example ISA150X100X10)
3. ISBA – Indian Standard bulb angle

Indian Standard bulb angle (ISBA) are used in the ship constructions because they are more stiff.

5. Rolled steel hallow/ tube section

The design shapes of hallow are generally rectangular, square, circular etc which are shown in the below figure. They are used as the compression members in the structure. The design of the hallow rectangular and square sections are based on their sides and thickness criteria. The design of circular section is based on the outside diameter and self weight. The steel tubular sections are most efficient compression members because the area of steel is distributed equally about all axis.

6. Rolled steel flat section

The rolled  flat are designed based in the width and thickness of the member. These are used as the lattice members in the built up column sections.

Example : 150ISF15

7. Rolled steel plate sections

The rolled steel plate sections are designed based in the length, width and thickness of the member. These are used in water tanks, other storage structures, built up columns, built up beams and flats in foundation.

Example : ISPL 2000X1000X10mm

8. ISRO

ISRO stands for Indian standard round bars. Generally these are of circular shape, the design of ISRO sections are based on the diameter of the bar. The ISRO sections are used as the reinforcement in the beams, column, foundation etc.

Example ISRO 10, ISRO 12, ISRO 16

9. ISSQ

ISSQ stands for Indian standard square bars. These are designed bared on the width of the square.

Example ISSQ 12, ISSQ 16, ISSQ 20

NOTE: In most of the cases one of the above described sections are used in the civil engineering structures. If the any section not satisfied then built up sections are used.

Built up section

If the applied load is more if anyone of the above section is not satisfied then built up sections are used. The combination of two or more steel sections to form a section is called as the built up sections. The built up sections are made by using riveted connection or bolted connection or welded connection depending upon the required strength. The strength of the built up section is very high when we compared with rolled steel sections.

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Conclusions of rolled steel sections used in civil engineering and types of steel rolled sections

Well now the above explained concepts are related to the types of steel sections used in the civil engineering. The steel  sections are mainly classified into 9 types namely Rolled I Section, Rolled Channel Section, Rolled T Section Rolled angle Section, Steel hallow (or) Tube Section, Steel rolled Flat Section, Steel Plate Section, ISRO, ISSQ.

Under rolled I section it will be consist of 5 types of steel sections,  Under rolled channel  section it will be consist of 4 types of steel sections, Under rolled T section it will be consist of 4 types of steel sections  and Under steel rolled angle  section it will be consist of 3 types of steel sections.

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