الفهرس 
CHAPTER 1: INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Nowadays we have a huge devolvement in building technology that made us in need to have new structural systems to resist lateral loads as earthquakes and wind loads.
The Egyptian code contains four construction systems for buildings, and only one of them pertains to tall buildings, the American code contains eight groups of construction systems divided after that into more than eighty structural systems, of which more than forty are suitable for high buildings.
Among those systems, outrigger system that is used in high-rise buildings are efficient for building with height up to 200 floors.
The analysis of the structural building was done using ETABS 2019 and ETABS 2016 softwares under effects of wind and earthquakes loads according to Egyptian codes 2018, loads code 2012 and American codes 2020 using pushover analysis to get the most accurate results.
This study investigates the difference between R-factors (Response Modified Factor) for 30 story high rise building with and without outrigger by Egyptian codes ECP-201/ECP-203 (2018) and American codes IBC/ACI 318/ASCE7(41-22). For this purpose, a building with 30 stories reinforced concrete structure with two outriggers placed in optimum locations is studied.
This study use shear walls as outrigger element to ties core with exterior columns only in outrigger floor nowadays in heigh rise buildings outrigger becames the best earthquake resistant system and became efficient to found that R-factors and their parameters to resist earthquakes