Prioritization and Assessment of the Existing Damage Indices in Steel Moment-Resisting Framed Structures

Seismic behavior assessment of framed structures is necessary for life and financial damage estimation. During recent years, as an earthquake engineering progresses, knowledge and experience related to seismic responses have been developed. The new seismic behavior assessment methods have been proposed so it is indispensable to define a formulation as a damage index, which damage amount has been quantified and qualified during earthquakes. In most cases, damage indices are dimensionless parameters intended to range between zero for the undamaged state and unity for the collapsed state of a member or an entire structure and other values show different damage states.In this paper, ۴ new steel moment-resisting frames with different height and regular plant were supposed and designed according to ASCE۷-۲۰۱۰. The necessary parameters were obtained for damage indices such as local indices: interstory drift, maximum roof displacement, banon failure, kinematic, banon normalized cumulative rotation, cumulative plastic rotation and ductility and also global indices: roufaiel and meyer, papadopoulos, sozen, rosenblueth, ductility, hysteretic energy, Park-Ang and base shear, and finally story indices: banon failure (weighted index) and interstory rotation hence they have been derived and calculated under the effect of far-fault ground motion records by non-linear dynamic time history analysis using SeismoStruct V.۷.۰.۶. Finally, prioritization of the existing damage indices, is defined based on more conservative values in terms of more damageability rate in the studied models. Then as a result banon failure, interstory drift and park-ang are more conservative local, storey and global indicators respectively among the existing damage indices.Seismic behavior assessment of framed structures is necessary for life and financial damage estimation. During recent years, as an earthquake engineering progresses, knowledge and experience related to seismic responses have been developed. The new seismic behavior assessment methods have been proposed so it is indispensable to define a formulation as a damage index, which damage amount has been quantified and qualified during earthquakes. In most cases, damage indices are dimensionless parameters intended to range between zero for the undamaged state and unity for the collapsed state of a member or an entire structure and other values show different damage states.In this paper, ۴ new steel moment-resisting frames with different height and regular plant were supposed and designed according to ASCE۷-۲۰۱۰. The necessary parameters were obtained for damage indices such as local indices: interstory drift, maximum roof displacement, banon failure, kinematic, banon normalized cumulative rotation, cumulative plastic rotation and ductility and also global indices: roufaiel and meyer, papadopoulos, sozen, rosenblueth, ductility, hysteretic energy, Park-Ang and base shear, and finally story indices: banon failure (weighted index) and interstory rotation hence they have been derived and calculated under the effect of far-fault ground motion records by non-linear dynamic time history analysis using SeismoStruct V.۷.۰.۶. Finally, prioritization of the existing damage indices, is defined based on more conservative values in terms of more damageability rate in the studied models. Then as a result banon failure, interstory drift and park-ang are more conservative local, storey and global indicators respectively among the existing damage indices.

Keywords:

Steel Moment-Resisting Frame , Non-linear Dynamic Time History Analysis , Damage Index , Prioritization , Far-Fault Ground Motion Records , SeismoStruct V. ۷.۰.۶