Effects of the Unchartered Faults on the NSCP 2010

This paper is by Carlos Villaraza from ASEP. It was presented after the Bohol Earthquake when a new faultline is discovered. Lots of people are questioning the structural code specifically the seismic provision. However, this paper states that dividing the entire Philippines in two seismic zones rather than adopting a spectral map similar to USA, is justifiable and will take care of the uncertainties in unchartered faults.

To appreciate this paper, one must be knowledgeable with response spectra and basic earthquake engineering. Basically, every structural designer will refer to Seismic map in NSCP to get the seismic force value that a structure will be subjected into. The distance of the structure location to the nearest faultine is very important so that a specific value of seismic coefficient will be determined prior to getting seismic base shear. A problem is faced when an unidentified faultine is near the structure. However, the response spectra analysis shown by Villaraza will show that unchartered fault like in Bohol will not be much significant, by NSCP though this was not shown in the map.

Download here the paper.

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Design of Reinforced Concrete Building According to NSCP

This slide shows a general outline of procedure to design a building according to NSCP.

The outline of presentation is below:

1. Reclassification of structures
• School building for example is now under Essential facilities because it is used as evacuation center. Increase in importance factor will increase the base shear the building is designed.
2. Review of loading requirements and changes
• A kd factor in wind loading is now included. Zoning of Wind map for Philippines is not only shown in the map but is now tabulated to avoid confusion.
3. Design Criteria
4. Sample Problem Structural Systems
5. P Delta effects and maximum inelastic drift
6. Loading combinations
7. Design of Beams
8. Design of Columns
9. Design of Shear walls
10. Scaling of static and dynamic base shear

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Seismic and Wind Design of Concrete Building

Reading this book and applying the methods here is like designing for buildings under our NSCP code. Although the author uses IBC, as opposed to NSCP following UBC 1997, the design procedure and concrete provision explained in the book is very similar to NSCP.