Buildings in hilly terrain are often constructed along the natural slope of the ground. Surveys by several researchers in the past have highlighted two major building configurations based on the arrangement of the foundations—split foundation and step back foundation. The dynamic behavior of these buildings is not like the buildings founded on flat land. Some studies have reported that the seismic response of these buildings is prone to amplification due to the presence of vertical irregularities in stiffness and mass. Nevertheless, these buildings are not only subjected to earthquake hazard, but they might also be subjected to severe wind load or manmade hazards such as blast. In the present study, the dynamic behavior of buildings with spilt foundation under multiple hazards is investigated. Further, a preliminary study is carried out to investigate the effectiveness of base isolation technique in reducing the demand for these buildings under earthquake, wind and blast loadings. It is observed that the effectiveness of the isolation is less in case of buildings with split foundation as compared to the buildings on flat land.

Blast; Earthquake; Hilly Terrain; Multi-Hazard; Wind.