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Unformatted text preview: IC OF THE PHILIPPINES
DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
OFFICE OF THE SECRETARY
May 5, 1992
ENGR. ENGRACIO P. DE GRACIA
Association of Structural Engineer
of the Philippines, Inc.
5th Floor, Mareic Building, Tordesillas Street
Salcedo Village, Makati, Metro Manila
Dear Engr. De Gracia:
We are pleased to inform you that the Department of Public Works and Highways has completed the
review and evaluation of the proposed Fourth Edition of the National Structural Code of the
Philippines, Volume I - Buildings, Towers and Other Vertical Structures, 1992. The Code was found
to have provided the minimum standards to assure public safety. It has also taken into account the latest
codal and technological developments that could improve safeguards against major failure and loss of
By virtue of the authority vested in the Secretary pursuant to Section 203(3) of the National Building
Code of the Philippinrd (PD 1096), the Fourth Edition of the National Structural Code of the
Philippines, Volume 1, 1992 is hereby approved as a referral Code of PD 1096.
Very truly yours, (Sgd.) JOSE DE JESUS
Secretary Significant changes incorporated in the Fourth Edition are as follows:
*Chapter I.This chapter has been revised to cover only design and construction requirements.
Minimum design loads provisions have been transferred to Chapter 2. A new design requirement
requires an independent design review of the structure in high seismic areas. Construction involvement
and qualification of a structural engineer are also defined.
*Chapter 2. The Zoning map has been changed to indicate two seismic zones, 2 & 4. Sections on
seismic forces have been entirely changed to conform with the provisions of 1988 SEAOC. It is more
specific in its definition of structural systems, irregularities, and the details of dynamic analysis. The
wind requirements have been revised to conform with the provision of 1988 Uniform Building Code,
(UBC). *Chapter 3. This chapter is an adoptation from the 1988 U.B.C. chapter on wood. the material
data, however, refers to Philippine Wood as determined by the Forest Product Research Insitute
*Chapter 4. This chapter on steel has been left unchanged from the previous edition except for the
addition of a Part 3. this part provides additional design and detailing requirements to reach the levels of
inelastic strength and stability of the structure subjected to substantial earthquake effects.
*Chapter 5. Special provision for seismic design of concrete structures, previously Appendix A of
Third Edition has been made an integral part of this Chapter. The rpovisions for the development length
for bars in tension, and tension lap splices have also been significantly revised.
*Chapter 6. The provisions of the Third Edition for masonry have been adopted without change. *Chapter 7 & 8. Chapter 8 "grading andEqrthworks" has been added. the provisions are adopted
from the 1988 U.B.C. edited to suit local conditions. (S...
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