Decrease of Seismic Demand in High Steel Frame by Changing the Kind of CBF Braced in Height of Structure

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Structures design in order to make them resistant against earthquake is one of the important structural subjects. According to this point that enhancing seismic science structural behavior and access to different technology the attention of designers has been more than before. Different seismic regulations try to control the damages to structures and become more assure about the structural seismic function. For this reason 20, 25 story moment frames with 3, 7 bays were analyzed time history non-linear dynamic and by changing the kind of brace in height suitable height for changing the kind of brace was suggested. In bracing changes, X braces and chevron braces has been investigated so that quake recommendation was used about down level stories stiffness against up level stories stiffness. At last this result was achieved that changing the kind of brace system in certain height can be effective on improving seismic behavior of structure. This specified level is related to number of stories or number of spasm or kind of earthquakes records, for instances in a 2 stories structure by alternating the third V bracing maximum story drift angle demand exhibits 75 percent of reduction and in a 25 stories structure by alternating the third V bracing, we see the lowest amount in the maximum local rotation demand.

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