الفهرس 
AbstractOnly 14 pages are availabe for public view
 |  | from | 142 |  |  |
| | | from | 142 | | |
Abstract
The interaction between the soil and the building plays an effective
role in determining the behavior of the building, especially in the occurrence of
earthquakes. Seismic impacts on buildings close to areas that have been negatively
impacted depend on many of the causes. There are many buildings in Egypt next to
the excavated areas. The concrete structure is designed to resist the load of
earthquakes without looking at the topography of the site. Hence, all the buildings
next to the excavated areas are thought to be safe.
And to answer this question, these buildings must be redesigned considering
the presence of soil, And the topography of the site under the impact of the load of
earthquakes to know the limits of safety and take quick action to ensure avoiding
the dangers of earthquakes. In this research, it is important to know the least safe
distance of the building located next to the excavated areas for securing such
buildings.
Therefore, it was studied different mid-rise moment-resistant building frame
adjacent to an excavation area and knowing the performance levels to describe the
state of structures after being subjected to a certain hazard level. Three types of
mid-rise moment-resisting building frames, including 6-storeies , 9-storeies and
12-storeies, are selected. Building frame is constructed on a sand soil with layers of
different density, representing soil class c, according to the Egyptian code of
practice. Different excavation depths, including 4m, 8m, and 12 m, are employed
in the numerical modeling using finite difference software FLAC 2D. The above
mentioned frame has been analyzed under two different boundary conditions: (i)
flexible base (considering soil – structure interaction) without excavation and (ii)
flexible base (considering soil-structure interaction) adjacent to excavation area
Abstract
(iv)
.Elastic dynamic analyses under the influence of earthquake records for the three
excavation depths previously mentioned are conducted. The results of the
maximum lateral displacements and the inter-story drifts are used to determine the
safe distance between the building frame and an excavation area. The results show
that the increase in the excavation depth, structure height, and the decrease in the
distance between the building and the excavation dramatically shift the predesigned limit state of the structure from the life safety limit state to the collapse
state under an anticipated earthquake action