Soil Specification Effects on the Displ. Amplification Factor of Industrial Steel Structures with Cranes

According to construction of industrial Steel Structures with Cranes in developing countries, the importance of seismic behaviour of such kind of structures are evident. In this research, the overall structural behaviour is briefly described, then 3 models of existing industrial steel structures with cranes are selected. All models are assumed to have bolted connections, for which the damping ratio for all of them is taken into account 10% of critical damping. Then, accelerograms recorded on soil types 1, 2 & 3 , is selected according to 4th ver. of Iranian 2800 seismic code and scaled to Sa=0.25g & Sa=0.35g spectral acceleration levels. Nonlinear Time History analyses are completed for all designed finite element models, using above mentioned scaled records. Modal Pushover analyses are carried out to illustrate the yielding base shear force and the demanded base shear force for the first plastic hinge to form. Finally, the results of Ductility Factors, μ, overstrength Reduction Factors, Rs, and the Displacement Amplification Factors,Cd, obtained from various records for finite element models, due to spectral accelerations and based on 3 soil categories are summarized and discussed.

Keywords:

Nonlinear Time History Analysis , Ductility Factor , Industrial Steel Structures with Cranes , Displacement Amplification Factor