Abstract:
Experiences from previous earthquakes have shown that level of structural damages
depends on soil characteristics where the structure is built on. Also, changing
functioning and occupancy of the building after construction increases the scale of
these damages. This study aims to investigate the effects of soil types B, C, and D and
importance classes II, III and IV, given in the Eurocode 8, on seismic response of
reinforced-concrete dual-framed structures evaluated by using linear static analysis.
For this purpose, analysis and design of low and mid-rise buildings are considered.
The analysis is performed with the equivalent lateral force procedure using Tekla
Structural Designer software package. Combinations on analysis and design for
different types of soils and different importance factors are done on a 4-storey dual framed and a 7-storey dual-framed structures, representing low and mid-rise buildings
respectively. Results are compared considering the required total amount of
reinforcement for each building alternative. It is quite clear that the demand for
reinforcement of buildings built on soil type D is much higher than those in soil types
C and B. Also the demand for reinforcement is much increased for buildings in
importance class IV compared to those in Importance class III and II. The increase in
reinforcement demand from a building type having Importance class II with soil type
B to a building type having Importance class IV with soil type D is 109.8 % for 4-
storeys and 134.96 % for the 7-storeys. Comparisons in cost of construction carried
out taking in consideration demands for reinforcement of each alternative buildings,
show an increase of 39 % for 4 storeys, and 47 % for 7-storeys, from building designed
for II-B to building designed for IV-D.
