DELIBERATION THE EFFECT OF ROCKING MOTION AND PLACEMENT OF BRACE FRAMES IN IMPROVING SEISMIC PERFORMANCE OF STEEL BRACED BUILDINGS

Many buildings need to quickly return to their primary function after an earthquake. The need to implement the functionality recovery process or the resiliency of earthquake‐rocking motion buildings after severe ground shaking is now at the forefront of structural engineering challenges and will undoubtedly become parts of codes of practice worldwide in the near future. The structural design of earthquake‐ ground motion structures demands greater analytic and detailing effort than those for code compliance only. The purpose of this study is to compare performance of mid height steel braced rocking buildings with low rise buildings. For this purpose, the seismic behavior of 3, 10 and 15 story buildings and effect of proper location of brace frames in 3 story buildings are studied under far-field earthquakes records. Nonlinear dynamic analyses are conducted at two maximum PGA levels of 0.35g and 0.7g. Response parameters including performance level, Maximum inter -story drift, vertical and horizontal acceleration, the amount of uplift displacement of the columns base are compared. The results indicate that all the responses are improved as the building height increases. Also, by moving the locations of bracing to the corners and inside the building, the responses are more favorable.

کلیدواژه ها:

Rocking steel braced frame ، Post tensioning tendon ، Nonlinear dynamic analysis ، Energy dissipation elements ، Far-field record