NEPAL NATIONAL BUILDING CODE
NBC 110 : 1994

PLAIN AND REINFORCED CONCRETE

Government of Nepal
Ministry of Physical Planning and Works
Department of Urban Development and Building Construction
Babar Mahal, Kathmandu, NEPAL
Reprinted : 2064

NBC108V2.RV97 December 1993

NEPAL NATIONAL BUILDING CODE
NBC 110 : 1994

PLAIN AND REINFORCED CONCRETE
This publication represents a standard of good practice and therefore
takes the form of recommendations. Compliance with it does not confer
immunity from relevant legal requirements, including bylaws
tTsflng>L % sf] ;/sf/ -dlGqkl/ifb\_ sf] ldlt @)^).$.!@ sf] lg0f{ofg';f/ :jLs[tGovernment of Nepal
Ministry of Physical Planning and Works
Department of Urban Development and Building Construction
Babar Mahal, Kathmandu, NEPAL
Reprinted : 2064
NBC108V2.RV97 December 1993

iPrefaceThis Nepal Standard was prepared during 1993 as part of a project to prepare a draft National Building
Code for Nepal.
In 1988 the Ministry of Housing and Physical Planning (MHPP), conscious of the growing needs ofNepal's urban and shelter sectors, requested technical assistance from the United Nations Development
Programme and their executing agency, United Nations Centre for Human Settlements (UNCHS).
A programme of Policy and Technical Support was set up within the Ministry (UNDP Project
NEP/88/054) and a number of activities have been undertaken within this framework.
The 1988 earthquake in Nepal, and the resulting deaths and damage to both housing and schools, again
drew attention to the need for changes and improvement in current building construction and design
methods.
Until now, Nepal has not had any regulations or documents of its own setting out either requirements
or good practice for achieving satisfactory strength in buildings.
In late 1991 the MHPP and UNCHS requested proposals for the development of such regulations anddocuments from international organisations in response to terms of reference prepared by a panel ofexperts.
this document has been prepared by the subcontractor's team working within the Department ofBuilding, the team including members of the Department and the MHPP. As part of the proposedmanagement and implementation strategy, it has been prepared so as to conform with the general
presentation requirements of the Nepal Bureau of Standards and Metrology.
The subproject has been undertaken under the aegis of an Advisory Panel to the MHPP.
The Advisory Panel consisted of :Mr. UB Malla, Joint Secretary, MHPP
Director General, Department of Building(Mr. LR Upadhyay)
Mr. AR Pant, Under Secretary, MHPP
Director General, Department of Mines & Geology(Mr. PL Shrestha)
Director General, Nepal Bureau of Standards & Metrology(Mr. PB Manandhar)
Dean, Institute of Engineering, Tribhuvan University(Dr. SB Mathe)
Project Chief, Earthquake Areas Rehabilitation &Reconstruction Project
President, Nepal Engineers Association
Law Officer, MHPP (Mr. RB Dange)
Representative, Society of Consulting Architectural &Engineering Firms (SCAEF)
NBC110V1.RV3ChairmanMemberMemberMemberMemberMemberMemberMemberMemberMember
12 May 1994

ii
Representative, Society of Nepalese Architects (SONA)
Deputy Director General, Department of Building,(Mr. JP Pradhan)

MemberMember-Secretary

The Subcontractor was BECA WORLEY INTERNATIONAL CONSULTANTS LTD. of New
Zealand in conjunction with subconsultants who included :Golder Associates Ltd., Canada
SILT Consultants P. Ltd., Nepal
TAEC Consult (P.) Ltd., Nepal
Urban Regional Research, USA
Principal inputs to this standard came from :Mr. JK Bothara, TAEC
DR. RD Sharpe, BECA (Team Leader)
Revisions and Updated to this code came from :Mr. Purna P. Kadariya, DG, DUDBC
Mr. Kishore Thapa, DDG, DUDBC
Mr. Mani Ratna Tuladhar, Sr. DIV. Engineer, DUDBC
Mr. Jyoti Prasad Pradhan, Ex.DG, DOB
Mr. Bhubaneswor Lal Shrestha, Ex. DDG, DOB
Mr. Uttam Shrestha, Architect, Architects' Module Pvt. Ltd.
Mr. Manohar Lal Rajbhandhari, Sr. Structural Engineer, Mr Associates
Mr. Amrit Man Tuladhar, Civil Engineer, DUDBC

NBC110V1.RV312 May 1994

iiiTABLE OF CONTENTS
Preface....................................................................................................................................................... i0Foreword........................................................................................................................................... iv

1Scope................................................................................................................................................... 1NEPAL AMENDMENTS TO IS 456 – 1978 ........................................................................................ 1
Section 0 - Foreword............................................................................................................................... 1
Section 1 -General ............................................................................................................................. 1

Section 2 – Materials, Workmanship, Inspection and Testing ........................................................... 1
Section 3 – General Design Requirements............................................................................................ 2
Section 5 – Structural Design (Limit State Method)............................................................................ 3
Section 6 – Structural Design (Working Stress Method) ...................................................................4NBC110V1.RV312 May 1994

iv0Foreword
This Nepal Standard comprises the Indian Code IS 456-1978 Code of Practice for Plain andRainforced Concrete (Third Revision) amended so as to meet the conditions of Nepal. In
particular, these amendments have been necessary to ensure compatibility with the Nepal
Standard NBC 105-94 : Seismic Design of Buildings in Nepal.
This document contains the amendments that are to be made to IS 456-1978 for its use inNepal.
Most of the references is IS 456-1978 to Indian material Codes have been left unaltered until
such time as appropriate Nepal Standards are developed.
Any subsequent revisions to IS 456-1978 shall be not be applicable to this Nepal Standard NBC
110-94 until specifically recognised by this Standard.

NBC110V1.RV312 May 1994

11

Scope

NEPAL AMENDMENTS TO IS 456 – 1978

Section 0 - Foreword
Delete clauses 0.1 through to 0.4 inclusively
0.5
0.6
0.8

Replace "code" with "Standard".
Replace "code" with "Standard".
Delete and Substitute :0.8

To amplify the recommendations given in IS 456-1978, a commentary on theStandard has already been published by the Bureau of Indian Standards. To
reduce design time in the use of certain clauses in the Standard for the design ofbeams, slabs and columns in general building structures, SP: 16-1979 "Design
Aids for Reinforced Concrete to IS 456-1978" is available. In addition,
handbooks on concrete mix design and concrete reinforcement are also available.

0.9

Replace "IS: 2-1960" with "NS 17-2037".

Section 1 1.1
1.2
1.3

Replace "code" with "Standard".
Replace "code" with "Standard".
add a new clause :
1.3

3.1

GeneralIn this Standard, the word "shall" indicates a requirement that must be adopted inorder to comply with the Nepal Standard and the word "should" indicatesrecommended practice.

Add
3.1

SL: Snow load

Section 2 – Materials, Workmanship, Inspection and Testing
4.1.a
4.2.2
4.6.a
4.6.c
NBC110V1.RV3Replace "IS: 269-1976" with "NS 49-2041".
Replace "code" with "Standard".
Replace "IS: 432 (Part-I) -1966" with "NS 84-2042".
Replace "IS: 1786-1979" with "NS 191-2046".
12 May 1994

2Section 3 – General Design Requiremnet
17.2.1

Replace "IS 1911 – 1967" with "NBC 102-94".

17.3

Delete and substitute :17.3

Live Load, Wind Load and Snow Load – Live loads, wind loads andsnow loads shall be calculated in accordance with NBC 103-94, NBC
104-94 and NBC 106-94 respectively.

17.4
17.7

Replace "IS: 1893-1975" with "NBC 105-94".
Replace "IS: 875-1964" with "IS 875: (Part V-1987".

17.9

Add
17.9

18.1

Both design methods require additionally-factored dead loads tobe considered in combination with the earthquake load.

Replace "code" with "Standard".

25.1.2 Delete and substitute :25.1.2

The recommendations for detailing for earthquake-resistantconstruction given in IS: 4326-1976 shall be taken into
consideration.

25.2.1.1 Replace "IS: 1786-1979" with "NS 191-2046".

NBC110V1.RV312 May 1994

3Section 5 – Structural Design (Limit State Method)
35.2

Replace "IS: 1911-1967" with "NBC 102-94".
Replace "IS: 875-1964" with "NBC 103-94 and NBC 104-94".
Replace "IS: 1893-1975" with "NBC 105-94".

35.4.1 Replace Table 12 with the following :Table 12
Values of Partial Safety Factor yr for Loads(Clauses 18.3 and 35.4.1)
Load Combination(1)

Limit Stage of Collapse

Limit States of Serviceability

DL+LLDL
(2)
1.5

LL(3)
1.5

WL
(4)
-SL(5)-DL(6)
1.0

LL(7)
1.0

WL(8)
-SL(9)
-

DL+WL

1.0*-

1.25-

1.0-

1.0-

DL+LL+WL

1.0

1.3

1.25-

1.0

0.8

0.8-

DL+SL+WL

1.0-

1.25

1.25

1.0-

0.8

1.0

NOTES :

*1.

When considering earthquake effects, substitute EL for WL.

2For the serviceability limit state, the values γ f given in this table are applicable for shortterm effects. While assessing the long term effects due to creep, the dead load and onlythat part of the live load likely to be permanent may be considered.

This value is to be considered when stability against overturning or stress reversal is critical

NBC110V1.RV312 May 1994

4

Section 6 – Structural Design (Working Stress Method)
44.1.2 Replace "IS : 1786-1979" with "NS 191-2046".
43.4

Add

new clause :43.4

Design Load Combinations for Working Stress Method.
For the design of a structure and its components, the following loadcombinations shall be considered :
1.
2.
3.
4.

DL + LL
DL + LL + WL
0.7 x DL + WL
DL + SL + WL

Note : When considering earthquake load, substitute EL for WL.
The value 0.7 is to be considered when stability against overturning orstress reversal is critical.

44.2

Table 16
Replace "IS : 432 (Part-I)-1966" with "NS 84-2042".
Replace "IS : 1786-1967" with "NS 191-2046".

NBC110V1.RV312 May 1994