SIXTH EDITION
NSCP C101·10
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TRUCTURAL CODE OF THE PHILIPPINES
VOLUME I BUILDINGS, TOWERS AND OTHER VERTICAL STRUCTURES SIXTH EDITION
Association of Stmctural Engineers of thc Philippincs Suite 7 I3, Future Point Plaza Condominium 1 112 I'anay Avenue, Quezon City, Philippines 1100 Tel. No ; (+632) 410-0483 F"x No.: (+632 ) 411-S606 Enlail: i~~l!."!.!ili!.l...I.;Yf.gJ]]illL~~Jl!.! Webs ite: http: //www.aseponline.org Nat!Oni'll Structural Code of U'le Philippines 6!il Edition Volume 1
NSCP C101-10
NATIONAL S~rRUCTURAL
CODE OF THE PHILIPPINES 2010
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VOLUME I BUILDINGS, TOWERS AND OTHER VERTICAL STRUCTURES SIXTH EDITION
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Association of Structural Engineers of th e Philippines
NATIONAL STR UcrURAL CODE OF THE PHILIPPINES (NSCP) CIOI-IO Volume I Buildings, Towers and Other Vert ica l Structures Sixth Edition, 2010, First Plinting Copyright @ 20 I0, The Association of Structural Engineers of the Philippines, Inc. (ASEP) All rights reserved. Thi s publicat ion or any part thereof must no! be reproduced in any fom1 wilhoullhe written pcmlission of Ihe Associat ion Slructu ral Engineers of the Philippines, Inc. (ASEP).
ISSN No.: 2094-5477 PUBLISHER Association of Structural Engi neers of the Philippines, Inc. (ASEP) Suite 713 Future POilU Plaza Condominium 112 Panay A venu e, Quezon City, 1100 Philippines
Telephone Nos.
(+632) 410-0483 (+632) 411-8606
Facsimile No. E-mail address
[email protected]
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hltp:llwww.asepo nIine.org
The Association of Structural Engineers of the Phili ppines, Inc . (ASEP) is a professiona l Association found ed in August
1961 to represent the structural engineering communi ty nationwide. This document is published in keeping wilh the association's objectives; Maintenance of high ethi cal and profess ional standards in the practice of structuraJ engineering; Advancement of structural engineering knowledge; Promot ion of good public and private clientele relationship; and Fellowship among structural engineers, and professional relations wit h other allied technical and scienlific organi zat ions.
Print His tory First Edition, 1972 Second Edition, 1981 Third Edit ion, 1987 Fourth Edi tio n, 1992 Fifth Edition, 2001 Sixth Edition. 20 J 0
National Structural Code of the Philipp ines 6" Edit ion Votume 1
FOREWORD For the protection of public life and propeny, the design of structures and the preparation of structural plans for their construction have to be controlled and regulated. For almos t four decades now, this control has been exercised in this countly by the National Structural Code of the Philippines with the initial publication by the Association of Structural Engineers of the Philippines (ASEP) of the National Structural Code for Buildings. The c urrent publication of the 6'" Edition of NSCP CIOI - 10 for buildings, towers and other vertical structures is the affinnation of the mandate of the ASEP to continuously update the National Structural Code of the Philippines with the latest technological developments. While attaining a legal status in its use as a referral code of the National Building Code, NSCP CIOI-1O is a publication of high technical value in matters of structural concerns.
The NSCP CIOI-IO is not only complete ly new in its technical substance but also in its format. It has been a product of a sustained effon of ASEP spanning nine years and the fruition of this endeavor has finally come to reality during my incumbency. It is therefore with a deep feeling of gratitude and pride that I commend the members of the ASEP Board, the Codes and Standards Committee and the Publicity and Publications Committee for their accomplishments.
May 2010.
AD~S'F.ASEP
Presiderll Association of Structural Engineers of the Philippines. 2009-2010
Association of Structural Engineers of the Philippines
PREFACE TO THE NSCP SIXTH EDITION 1.
Introduction ASEP recognizes the need for an up-to-date structural code addressing the design and instalbtion of building stmclUral systems through requirements emphasizing performance. The new National Stl1Jctural Code of the Philippines (NSCP) is designed 10 meet these needs through various model codes/regulations, generally from the United S((I(CS, to safeguard the public health and safety nationwide.
This updated StI1lc(ural Code establishes minimum requirements for building structural systems using prescriptive and pcrforrnance-bascd provisiolls. It is founded 011 broad-based principles [hat make possible the usc of new materials (ind new building designs. Also, this code rencets the latest seismic design practice ror ea rthq uake rcsis!allt structures. 2.
Changes and Developments In ilS drive 10 upgrade and updale Ihe NSCP, Ihe ASEP Codes and Siandards Commillee inilially wanled 10 adopi the larest editions of American code counterparts. However, for cases where available local data is limited to suppon the upgrade, then some provisions and procedures of the NSCP 5 th edition were retained. This NSCP 6th edi tion is based on the follow ing international codes and references: a.
Uniform Building Code UBC·1997 (adopled for Earlhquake Loads)
u.
Imernational Building Code IBC·2009 (referenced)
c.
American SocielY of Civil Engineers ASCE7·0S (adopted for Wind Loads)
d.
American Concrete Institute ACI318·08M
c.
American Institute for Steel Construction AISC·05 with Supplementary Seismic Provisions
f.
American Iron and Sleelinslitute AISI S 100-2007
g.
Reinforced Masonry Engineering Handbook America
h.
Concrete Masonry H andbook, 6th Edition
Signifi cant rev is io ns are summari z.ed as follows: a.
Chap ter I - Genera l Requirement s. The rollowing changes arc madc in this code: a. J
Section 103 - Classification of Buildings School buildings of more than one storey, hospitals and designated evacuation ce nters are added under the essential facilities category.
a.2
Section 104 - Design Requirements Deflection of any structural member under the serviceabili ty requ iremen t is deleted. For concrete and Sir:l,'.1 materials see Chapter 4 and 5 respecti vely; new requiremenls are added 10 the design review section.
a.3
Section 105 - Post ing and InslrUme nlati on The provision of installed recording accelerograph is adjusted.
National Structural Code of the Philippines 6'" Edition Volume 1
b.
Chapter 2 - Minimum Design Loads. The changes made in this code are as follows: b.i
Section 203 - Combination of Loads
The load factor val ues on wind 100lds (Ire loads. b.2
adjll~ted
together with the inclusion of rOlin
Section 205 - Live Loads Additional loads arc in corporated in the table for minimulll uniform and concentrated loads.
b.3
Sec ti on 207 - Wind Load s Wind load provisio ns, which were previously based on ASCE7-9S, are updated by lhe introduct ion of the 'Wind Directionality Facto r, KJ , based on ASCE7-0S. The ANSI ErAITIA-222·G is also referenced for wind loads on antennas. Equations [or the gust effect facLOrs for both rigid and flexible structures are introduced. These include the gust effect factor for antennas, tran smission and latticed towers, poles/posts, masts and transmission Jines based on ASCE Manual of Practice NO.74 (Guide lines for Electrical Transmission Line Stru ctural Loading). New rormu las are also introd uced for the natural freq uency and damping rat io.
h.4
Sec ti on 208 - Earthquake Loads Basi ca lly. Lhere are no major changes on the earthquake provisions due 10 the 110navailabiJi'lY of Phivolcs-issued spectral acceleration maps for all areas in the Philippines. However, ASCE/SEI7-05 is recognized as an alternativ e procedure in the determination of the earthquake loads.
b.S
Section 210 and Section 2i 1- Environmemal Loads New sections on rai n loads and nood loads are added.
c.
Chapter 3: Specifications ror Excavations and Geomatcrials. The revisions made in this updated code arc ,IS rollows: c.1
Provisions ptrtaining to the conduct and interpretation of found
