Dr.Mahendrakumar Madhavan Associate Professor

Department of Civil Engineering IIT, Hyderabad mkm@iith.ac.in

Structural Steel Present Scenario of our Nation…

A Way to go forward…

Dr.Madhavan IIT HYD

2

Story of the presentation

1. Tells about what is the problem - Earthquake, and Wind

2. Problem with concrete

3. A small comparison with China

4. Views of completed CFS buildings

5. CFS/HRS construction process - within 4 days

6. Don't worry about steel corrosion

7. What we do at our IIT HYD

Latur Earth Quake-1993 3

by: Indian Institute of Technology Kanpur, Building Materials and Technology Promotion Council, New Delhi, India

“This 2002 seismic zone map is not the final word on the seismic hazard of the country, and hence there can be no sense of complacency in this regard”.

Indian Seismic Zone Map-1970 Indian Seismic Zone Map-2002 As per IS 1893 (Part-1)-2002

http://www.iitk.ac.in/nicee/EQTips/EQTip04.pdf 4

Reference-A Report-Cyclone hazard prone districts of India

India has a coastline of about 7500 km.

This coastline

comprises of 66 wind prone districts in 9 states

5

A typical brick masonry house destroyed by Cyclone Phailin in Odisha 2013

Reference-Rapid Damage and Needs Assessment Report, Government of Odisha https://openknowledge.worldbank.org/bitstream/handle/10986/17608/838860WP0P14880Box0382116B00PUBLIC0.pdf?sequence=1 6

Cyclone Seismic

Indian Meteorological Department (IMD) Report-Cyclone hazard prone districts of India

7

India becoming more vulnerable in natural disasters

8

Non availability of concrete raw materials

• River Sand?

• Cement (Decline in lime stone sources)?

• Aggregate (Disappearance of Mountains)?

• Potable water

• Labour shortage

Compared to Concrete, Masonry and Timber, Steel has many advantages….

Steel has the highest strength to weight ratio of any building material.

Ductile material.

Simplified foundation construction.

Components are sustainable i.e can be recycled

Steel is environmentally friendly.

Steel construction is a fast method.

9

Lack of Standard specifications

and Design guidelines for

Construction of Cold-formed Steel Structures

10

11

Cold Formed Steel Structures

www.cibonsazeh.com

Installed home with attached garage

Steel Framing Prototype Development U.S. Department of Housing and Urban Development

Affordable Housing Research and Technology Division

Dr.Madhavan IIT HYD

In China - Light steel villa project

Qingdao Jiaozhou Dr.Madhavan IIT HYD

14

Hot Rolled Steel Projects

Application in rural INDIA

Setting out of

base concrete

work

Assembly of Wall panels

in site (After 7 days of curing period)

Erection of Wall panels in position

(Corner ,Intermediate wall panels)

Connection of columns with

Floor

Erection and connection work of Roof

claddings with the wall panels

Assembly of Door & Windows

in the wall panel

Step-1

Day-1 Step-2

Day-2 Step -3

Day-2 Step-5

Day-2 Step -4

Day-3 Step-6

-:Outline of Construction procedure :-

15

16 Building layout

Building Foundation layout

Day-1

Rise of super structure

Day-2 (After concrete curing period)

Rise of super structure

Day-2

Rise of super structure

Wall panels can be of Cold formed wall panel with light

concrete filling Day-3

Rise super structure

Roof panels can be of Cold formed wall panel (corrugated sheathing)

Day-3

22

AISI (American Iron and Steel Institute) (2007). “Galvanized Steel Framing for Residential Buildings”. Research Report RP06 - 1.

Don’t worry about the corrosion…

The structure will last for minimum of 300 years to the maximum of 1484 years.

• 7 years of research by AISI.

• Based on the weight loss.

• Various environments.

Cold-formed Steel

23

Residential building (G+3) constructed using Cold-formed steel (cement board sheathing)

24

Preliminary research work in being done at IIT

Hyderabad

3 Ph. D students are working in a different area to implement the affordable housing

project.

1. Cold formed steel wall panels 2. Light weight steel dry floor system 3. Connection design on steel buildings

250 kN Actuator

CFS Stud (Z Section)

Supports

Gypsum board

Lateral loading test on Cold Formed Steel wall panels

Load spreader beam simulates the wind load

Flexural test on Structural steel channels (structural members in the residential house)

Supports

Channel specimen

Flexural test on Dry steel floor panels (structural members in the residential house)

Depth of the specimen = 40 mm

Total weight of the specimen = 18 kg

Total load taken by the specimen = 1400 kg

Few Thoughts

• Per capita consumption of steel is directly proportional to GDP. Increase consumption of steel to promote national growth

• Land is becoming a premium in India.

• Our population has increase four times since independence.

• This requires us to grow vertically using a high strength superior material such as Steel.

• India is fast becoming a Seismic prone nation.

• Preferred choice of material for Seismic is Steel.

Dr.Madhavan IIT HYD

Future needs • High strength steel (350,450,550 MPa & beyond)

• Parallel flange structural steel sections

• Advocate the need for structural steel in Bridge industry

• Policy makers should take a decision based on life cycle cost analysis not on initial cost alone

• Improvements to IS-800 and IS-801 Inclusion of commentary Inclusion of real life design examples

Any question that I can

answer?