Contents of BNBC 2017

BNBC codes available in Bangladesh

• BNBC 2017
• BNBC 2006
  • BNBC 2006 was published first in 1993 but was gazetted in 2006 as BNBC 2006
  • training on this topic is available here

Purpose of BNBC 2017

• The purpose of this Code is to establish minimum standards for design, construction, quality of materials, use and occupancy, location and maintenance of all buildings within Bangladesh in order to maintain safety for life, property and public welfare.
• The provisions of this Code are applicable to all persons of Bangladesh
• some info is available in another article.

Scope of BNBC 2017

• The provisions of this Code shall apply to the design, construction, use or occupancy, alteration, moving, demolition and repair of any building or structure and to any appurtenances installed therein or connected or attached thereto, except such matters as are otherwise provided for in other ordinances and statutes controlling and regulating buildings.
• If for any case different sections of this Code provide different specifications for materials, methods of design or construction, or other requirements, the most restrictive specification shall govern.
• In case of any conflict between a general requirement and a specific requirement, the specific requirement shall be applicable.
• Unless otherwise explicitly stated in this Code, all references to part, chapter or section numbers or to provisions not specifically identified by number, shall be construed to refer to such part, chapter, section or provision of this Code.

Table of Contents of BNBC 2017

Volume I

Part 1: Scope and Definition

Part 2: Administrations and Enforcement

Part 3: General Building Requirements, Control and Regulation

Part 4: Fire Protection

Part 5: Building Materials

Volume II

Part 6: Structural Design

Chapter 1            Definitions and General Requirements

Chapter 2            Loads on Buildings and Structures

Chapter 3            Soils and Foundations

Chapter 4            Bamboo

Chapter 5            Concrete Material

Chapter 6            Strength Design of Reinforced Concrete Structures

Chapter 7            Masonry Structures

Chapter 8            Detailing of Reinforcement in Concrete Structures

Chapter 9            Prestressed Concrete Structures

Chapter 10          Steel Structures

Chapter 11          Timber Structures

Chapter 12          Ferrocement Structures

Chapter 13          Steel-Concrete Composite Structural Members

Volume III

Part 7: Construction Practices and Safety

Part 8: Building Services

Part 9: Alteration, Addition to and Change of Use of Existing Buildings

Part 10: Signs and Outdoor Display

Appendices

There are some appendices included in this code which are useful for practicing engineers.

Seismic Zone

Zone	Coefficient (g)
1	0.12
2	0.20
3	0.28
4	0.36

Codes Associated with BNBC 2017

Seismic Loads:

• Eurocode 8
• Alternatively in software ASCE 7-05 using Appendix C of BNBC 2017

Wind Loads:

• ASCE 7-05

RCC design:

• ACI 318-08

Steel design:

• AISC 360-05

Load Combinations

• Load combinations for structural design (LRFD)
• 1.4D
• 1.2D + 1.6 L + 0.5Lr
• 1.2D + 1.6Lr + L
• 1.2D + 1.6Lr +0.8W
• 1.2D + 1.6W + L
• 1.2D + 1.6W + L+0.5Lr
• 1.2D + 1.0E + 1.0L
• 0.9D + 1.6W
• 0.9D + 1.0E

D= Dead Loads, L= Normal Live Loads, Lr= Roof Live Loads, E= Earthquake Loads, W= Wind Loads

• The following load combination shall also be considered for structural design
• Vertical earthquake load shall be considered in the design
  • YouTube Lecture: Vertical Earthquake Load by Prof. Dr. Engr. Md. Jahangir Alam
  • 100% earthquake loading in one direction shall be considered combined with 30% earthquake force of orthogonal direction simultaneously for seismic design category D, Seismic category C with plan irregularity V (Non-parallel systems of shear wall)
  • “±100% in x-direction ±30% in y-direction” or                                                                
  • “±30% in x-direction ±100% in y-direction”

• Vertical deflection due to gravity
  • D+L
• Creep, settlement and long term effect
  • D+0.5L
• Lateral deflection of buildings due to wind load
  • D+0.5L+0.7W

Concluding remarks

BNBC 2017 should be studied and practiced by civil engineers for building safer and sustainable Bangladesh.