Conference Proceedings

Abstract

The main target of this research work is to show the differences of the National Structural Codes of the Philippines (NSCP) Seismic provisions of the 2 codes-- NSCP 1992 and the new one, NSCP 2010. In order to work out for the main differences of the Design Base Shear (V), the Linear Static Analysis (LSA), which is considered as the Static Lateral Force Procedure and the Response Spectrum Analysis (RSA), another method specified in the NSCP codes under the Dynamic Lateral Force Procedure were carried out to analyze a Three Storey Reinforced Concrete Public School Building. In the Dynamic Analysis, the maximum ground motion intensity, such as the peak ground acceleration (Amax) of the earthquake is considered. The outcome of this research work is an indispensable tool for Structural Designers who will assess the seismic hazard of existing buildings designed under the NSCP 1992 in terms of their structural integrity. While the structural designers’ liability is not limited to design flaws, it is their utmost concern to determine if there are deficiencies in their Seismic design criteria based from the National Structural Code of the Philippines. It is hoped that this research work will guide the Structural Designer in recommending structural strengthening and retrofitting of existing buildings which were designed under NSCP 1992.This is to enhance structural integrity of buildings thus, life threatening seismic hazard not only in School Buildings but all existing buildings as well can be minimized if not eliminated. The major findings of the research study are the effects of the Seismic Provisions of NSCP 2010 on the value of Design Base Shear which is greater than the effects of NSCP 1992 Seismic Provisions, the Elastic Response Parameters of Structural elements have resulted higher values in NSCP 2010 than in NSCP 1992 Seismic Provisions and eventually resulted to bigger sections and higher reinforcement index of structural elements in NSCP 2010 than in NSCP 1992. In the light of these findings and conclusions of this research, the NSCP 2010 seismic provisions imposed on the Three- Storey Reinforced Concrete School Building have resulted higher values of Design Base Shear V than in NSCP 1992 thus it implied that NSCP 2010 were more conservative and cautious in terms of the safety and structural integrity of the school building during seismic events. The higher values of elastic response parameters and the larger sizes of structural elements and higher reinforcement index in NSCP 2010 enhance the structural safety of the Three-Storey Reinforced Concrete School Building against severe earthquake , and its structural safety were given due consideration under the seismic provisions of NSCP 2010 wherein it should not collapse but with minimal non-structural damage only during a severe earthquake while NSCP 1992 provide more emphasis on the economic aspect of design but with greater possibility of structural damage and even collapse during the occurrence of the same earthquake.