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Design of earthquake resistant structure lecture 10

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26.04.2016 Design of Earthquake Resistant Structures Luna Hasani Lecture 10 Codes of Practice • The Uniform Building Code (UBC) has been used internationally for seismic design. • The last edition of the UBC was published in 1997. • Currently, the UBC is used for seismic design in Jordan. 1 26.04.2016 Codes of Practice • Afterwards, the UBC was merged with two other codes to form the International Building Code (IBC). • The IBC is used the United States. • All codes follow FEMA (Federal Emergency Management Agency) administered provisions. Structural Systems • The UBC code classifies structural systems as: Ordinary Moment Frame Moment Frame System Intermediate Moment Frame Shear Wall System Special Moment Frame Dual System (Frames and Shear walls) 2 26.04.2016 Diaphragms • During earthquakes, frames and shear walls are forced to act as one unit because of diaphragms. • Diaphragms are classified as either rigid or flexible. • According to ACI code, flexible diaphragms are those who thickness is less than 50 mm. Diaphragms • Rigid diaphragms distribute lateral forces to frames and shear walls. • Flexible diaphragms are treated differently, since they experience in-plane bending. 3 26.04.2016 Zoning • UBC code defines seismic hazard by using seismic zoning maps. • The maps are based on probabilistic approach. • The maps are divided into four regions, depending on hazard and intensity. • It is possible to construct a UBC respons ...
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