CHALLENGES IN DESIGN & CONSTRUCTION OF STEEL INTENSIVE - PowerPoint PPT Presentation

CHALLENGES IN DESIGN & CONSTRUCTION OF STEEL INTENSIVE STRUCTURES Debashis Datta & Arijit Guha Assistant General Manager (Civil & Structural) INSTITUTE FOR STEEL DEVELOPMENT & GROWTH (INSDAG) 793 Anandapur, Kolkata 700 107 1

Steel has some unique properties  High strength-to-weight ratio  Ductility  Malleability  Easy to give desired forms  Design light weight Structure  Design durable Structure 2

Advantages & Myths  Large span Structures with Steel  Fast track construction  Save Interest during Construction (IDC) & early generation of revenue or early occupation possible  Corrosion in steel use  Painting technology : 25 years maintenance free paints  Commonly 120 - 150 GSM Hot dipped Galvanisation is done 03-Jul-18 3

Protection against Fire  Fire protection  Intumescent paint or Vermiculite plaster increase fire rating  Fire protection offered by composite deck & columns by sinking effect being in touch with concrete 03-Jul-18 4

Achievable Design Feats  Challenging design feasible to easy fabrication & – erection / dismantling Construction through Destruction • All aspects of best design and construction practices to be adhered to while developing some innovative design • Steel Structures 10-15% costlier than conventional RCC Structure but saves about 40-50% Construction time • Steel-Concrete composite Structures 8-10% cheaper than conventional RCC Structure & also save 25-30% Construction time • Steel is basically used in skeleton of the Structure as beam and column 03-Jul-18 5

BENEFITS IN DESIGN  Steel – Non- decking material for concrete floors Composite/ Composite  Composite Deck reduces thickness of Concrete making building lighter  Lighter Structures attract less tremor from earthquake  Lighter Structures are Wind sensitive  Lighter Structure offers cost effective design for the foundation  In composite available headroom is more or additional floors are available 03-Jul-18 6

Electrical Protection Sustainability Sections & Connections • Steel, if earthed properly no chance of electrocution • Detailed as concealed material for safety • Steel 100% recyclable, hence development sustainable • Steel industry reduced energy consumption by 60% in the past 3 decades • Comparative sustainability achieved by use of more Steel • Rolled/Built-up sections – Angles, Channels, I / H Beams • SHS; RHS & CHS • Type of connections – Bolted or Welded; Rivet obsolete 7

Balanced Structural System with all possible load combinations is designed for:-  Carry dynamic and static vertical loads  Carry horizontal loads due to wind and earthquake  Resist stresses for temperature and shrinkage  Resist external and internal blast and impact loads  Robustness against fatigue and damping vibrations Satisfying:-  Architectural, user / owner’s requirements  Facilitate service systems like heating, ventilation, air-conditioning,  Facilitate simple and fast erection of the building  Adequate resistance to fire  Enable the building, foundation and ground to interact properly  Be economical 03-Jul-18 8

TECHNICAL ASPECTS IMPROVING PERFORMANCE & REDUCING COST OF STEEL INTENSIVE BUILDINGS • Optimisation from Planning stage – regular features • Less kinks in building plan ensuring low Stress concentration • Vertical bracing system along both orthogonal directions • Large span beams more sagging action (for Composite beam) • In High-Rise horizontal belt trusses at regular intervals • Stays at the junctions of beam-column reducing storey drift • Centrally located Shear Wall system; IBC Dual System 03-Jul-18 9

Composite Flooring System Modern Construction Methodology  S erviceability Conditions including the vibration  Architectural aspects  Structural strength verifications  Material and Geometric properties  CRIL, STEELFAB manufacturing embossed profiled steel sheets  Profiled Sheets at competitive price , will increase Composite Floor, support (form work) Wet Concrete during construction and replace tensile reinforcements in RCC slab 03-Jul-18 10

Floor System - major subsystem of a typical structural system  Contributing largely to the overall cost of the buildings  Steel & Conc. using maximum material properties make building system overall economic  Two-way system and one-way system  Composite Deck limited to thin plated flooring system integrated with steel beams by shear studs, shot fired shear connectors/deformation of the ribs 03-Jul-18 11

TYPICAL SECTION OF COMPOSITE SLAB WITH PROFILED STEEL SHEET WITH EMBOSSMENTS 03-Jul-18 12

What is Pre-Engineered Building ? Pre-engineered Buildings are a predetermined assembly of Structural members that has proven over time to meet a wide range of Structural and Aesthetic requirements. 03-Jul-18 13

SALIENT FEATURES OF PRE-ENGINEERED STRUCTURES • MAIN FRAME OF HIGH STRENGTH HOT ROLLED SECTIONS • PURLINS, SIDE GIRTS, EAVES STRUTS COLD FORMED STEEL • ROOF SHEETING & SIDE CLADDINGS OF PRE-COATED COLD ROLLED STEEL SHEETS CONNECTED TO SUPPORTING MEMBERS THROUGH SELF-TAPPED SCREWS • FLOORS OF SHALLOW / DEEP TYPE COLD ROLLED STEEL DECKING & RMC AS FLOORING 03-Jul-18 14

SHAPE OPTIMIZATION THE FRAME GEOMETRY MATCHES THE SHAPE OF THE BENDING MOMENT DIAGRAM FOR OPTIMAL DESIGN, THUS MINIMIZING MATERIAL WASTE AND REDUCING THE TOTAL WEIGHT OF FRAMES. 03-Jul-18 15

Application Areas  Warehouses  Workshops  Schools  Office Buildings  Commercial Buildings  Retail Buildings  Restaurants  Low Cost Housing  Aircraft Hangers  Vehicle Parking Sheds  Petrol Pump Sheds  Cold Storages  Shopping Centers 03-Jul-18 16

CODES CONFORMITY DESIGN a) Primary Framing System with Hot Rolled Section & Plates - IS: 800 – 2007 : Code of Practice for General Construction In Steel b) Secondary Framing System with Cold Formed Sections - IS: 801 – 1975 : Code of Practice for use of Cold Formed Light Gauge Steel Structural Members in General Construction In Steel ( Under Revision ) or “Metal Building Systems Manual – 2002” by Metal Building Manufacturers Association (MBMA) 03-Jul-18 17

Some Implemented Steel Composite Structures following Design of INSDAG 03-Jul-18 18

ISPAT PRAGATI BHAWAN New INSDAG Office Building, Kolkata Total Built-up Area about 30000 Sq. Ft. Total Structural Cost Including RCC & Structural Steel about Rs. 2200/- per Sq. Ft. 03-Jul-18 19

HANDLOOM HOUSE (2005) Client – CPWD (Nomination basis) Site Location – Janpath New Delhi Total Structural Steel consumed about 1400 Tonnes Reinforcements consumed about 700 Tonnes

INDIRA PARIYABARAN BHAWAN, NEW DELHI (2010) Client – CPWD (Nomination basis) Site Location – Jorbagh, New Delhi Total Structural Steel consumed about 645 Tonnes Profiled Deck Sheet consumed about 3192 sq m 3 July, 2018

LOW COST HOUSE FOR RURAL POPULATION IN INDIA INSDAG developed an innovative design and construction methodology of low cost house for poor rural population in India following Architectural guidelines of GOI under PMGAY Construction Cost Rs. 750/- per Sq. Ft. (Kolkata rates) INSDAG has applied for its patent 03-Jul-18 22

Steel Roof of Ummulong Church, Meghalaya 03-Jul-18 23

Guest House-cum-Marriage Hall at Howly, Assam 03-Jul-18 24

Indoor Stadium at Lady Keane College, Shillong 03-Jul-18 25

Indoor Stadium at UCC College, Shillong 03-Jul-18 26

Supporting Structure of Mahatma Sri Junga statue at Hee Bermiok, Sikkim 03-Jul-18 27

Indoor Stadium at Shillong College 03-Jul-18 28

Roof of Sri Krishna Pranami Temple at Bermiok near Singtam, Sikkim 03-Jul-18 29

Foot Over Bridge at Damthang, Sikkim 03-Jul-18 30

(B+G+6) storeyed Super-specialty Hospital at Bongaigaon, Assam 03-Jul-18 31

Refurbishing over existing partly completed (G+7) storeyed RCC buildings Refurbishing over existing masonry-cum- concrete hostels (5 nos.) at IIEST, Shibpur 2 nos. Workshop-cum-laboratories at Shillong Engineering college Fire Exit structure at Shillong 03-Jul-18 32

Butterfly Reserve Park at Rangrang, Sikkim 03-Jul-18 33

Steel Roof of Sokhymphor Church, Meghalaya 03-Jul-18 34

National Student Competition for Best Innovative Use of Steel in Architecture 1999 - 2015 35 03-Jul-18

Glimpses of Some Worthy Entries Presentation by:  Anurag Bajpai  Ayush Jain  Prabhjot Kaur  Rishi Verma  IIT ROORKEE  (N014) 36 03-Jul-18

Glimpses of Some Worthy Entries INSDAG – 2005 INTERNATIONAL AIRPORT AT VISHAKAPATNAM PRESENTATION BY ASHIM K MANNA PIYAS CHOUDHURI TEAM NO. – N 024 JAMIA MILLIA ISLAMIA 37 03-Jul-18

Glimpses of Some Worthy Entries IIT, Roorkee 38 03-Jul-18

Glimpses of Some Worthy Entries PARKING CANOPY structure 39 03-Jul-18

WORLD CLASS TRADE FAIR COMPLEX, KOLKATA STAIRS AND ESCALATORS 40 03-Jul-18

National Competition for Professionals on Structural Steel Design & Construction 2004 - 2014 41