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Long Period Strong Ground Motion and Its Use as Input to Displacement Based Design
Consistently with the use of seismic inertia forces for the verification of structural members, buildings have been traditionally designed for earthquake resistance by relying on ground acceleration from strong earthquakes to describe seismic loading; in most applications this is quantified by acceleration response spectra. However, structural design is increasingly becoming performance based, whereby displacements and deformations of structural and non-structural members, which directly control damage, are brought to the front stage to replace accelerations and inertia forces. Thus, the relative displacement of the structure caused by the imposed ground motion, quantified through the displacement response spectrum (DRS), becomes the primary descriptor of the seismic demand. Methods are available to replace the actual structure (a non-linear multi-degreeof-freedom system) with an equivalent linear 1 DOF system, in which energy dissipation due to the non-linear response is accounted for through a large viscous damping factor. A synthesis of the main steps involved in the (direct) displacement based approach is provided in Figure 2.1. Since the design involves the response of the damaged structure, which is “softer” than the undamaged one, the vibration period T at play is significantly larger than the elastic, or initial, period. Hence, depending on the structure, DRS will have to encompass a broad T range, e.g. up to 10 s, well beyond the typical 0–4 s range of current norms (CEN, 2004).
Long Period Strong Ground Motion and Its Use as Input to Displacement Based Design
Consistently with the use of seismic inertia forces for the verification of structural members, buildings have been traditionally designed for earthquake resistance by relying on ground acceleration from strong earthquakes to describe seismic loading; in most applications this is quantified by acceleration response spectra. However, structural design is increasingly becoming performance based, whereby displacements and deformations of structural and non-structural members, which directly control damage, are brought to the front stage to replace accelerations and inertia forces. Thus, the relative displacement of the structure caused by the imposed ground motion, quantified through the displacement response spectrum (DRS), becomes the primary descriptor of the seismic demand. Methods are available to replace the actual structure (a non-linear multi-degreeof-freedom system) with an equivalent linear 1 DOF system, in which energy dissipation due to the non-linear response is accounted for through a large viscous damping factor. A synthesis of the main steps involved in the (direct) displacement based approach is provided in Figure 2.1. Since the design involves the response of the damaged structure, which is “softer” than the undamaged one, the vibration period T at play is significantly larger than the elastic, or initial, period. Hence, depending on the structure, DRS will have to encompass a broad T range, e.g. up to 10 s, well beyond the typical 0–4 s range of current norms (CEN, 2004).
Long Period Strong Ground Motion and Its Use as Input to Displacement Based Design
Faccioli, E. (author) / Cauzzi, C. (author) / Paolucci, R. (author) / Vanini, M. (author) / Villani, M. (author) / Finazzi, D. (author)
2007-01-01
29 pages
Article/Chapter (Book)
Electronic Resource
English
Long Period Strong Ground Motion and its Use as Input to Displacement Based Design
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