Abstract:
This research involves seismic design of a building for different levels of earthquake
intensity in Thailand. The design was carried out based on the seismic design standard
by the Department of Public Works and Town Planning 1302. This research serves as a
guideline for structural design of buildings for different seismic force levels in Thailand.
The study started by collecting data on existing buildings commonly found in Thailand.
A representative building was chosen. The selected building was analyzed and designed
under 3 different levels of earthquake intensity, low-to-moderate, moderate-to-high, and
high-to-very high intensity levels. These levels correspond to the earthquake intensity at
Kampangpetch, Kanchanaburi and Prae provinces, respectively. The results indicated
that the design based shear of the building in Prae province was the largest. The design
results showed that the structural elements of the building were larger when compared
to those of the case where earthquake forces were not considered. The larger sizes were
due primarily to the minimum dimension and strength requirements in the building
code. Because of this, the required reinforcement ratios were lower. The reinforcement
ratios of main girders decreased by I% when compared to that of the representative
building. For columns, the reinforcement ratio, when a special moment resisting frame
was used, reduced by 1.23% but the amount of stirrups increased by 4.5 times. When an
intermediate moment resisting frame was used, the reinforcement ratio of the main
column reduced by 1.69% but the amount of stirrups increased by 2.3 times.