TY - JOUR
ID - 240616
TI - An Optimal Distribution of Stiffness over the Height of Shear Buildings to Minimize the Seismic Input Energy
JO - Journal of Seismology and Earthquake Engineering
JA - JSEE
LA - en
SN - 1735-1669
AU - Haddad Shargh, F.
AU - Hosseini, M.
AD - IIEES
Y1 - 2011
PY - 2011
VL - 13
IS - 1
SP - 25
EP - 32
KW - Seismic Input Energy
KW - Linear Systems
KW - Modal Analyses
KW - Input Energy Spectrum
KW - Velocity Spectrum
DO -
N2 - Based on Housner's assumption, the average input energy from earthquakes to a building modeled as a single degree of freedom (SDOF) system, is related mainly to total mass of the building. Thus, based on the above premise for low damping and relatively long period systems, the seismic input energy per unit mass of the system (SDOF or MDOF) is mainly related to the ground motion features. The present study attempts to analytically reveal the range of validity of these assumptions in linear systems and to find an optimal stiffness distribution over the height of high-rise shear linear buildings to minimize the seismic input energy. To accomplish this objective, it is shown from the spectral standpoint that input energy spectra generally is a function of the natural period of vibration, so the input energy is further related to the stiffness of structure, the mass, damping ratio and ground motion characteristics. Subsequently, it is demonstrated that for low to moderate height (up to 20 stories) shear type structures, the optimal distribution of stiffness obeys a parabolic form, while for taller structures, this form is a bell-shaped function.
UR - http://www.jsee.ir/article_240616.html
L1 - http://www.jsee.ir/article_240616_1b5e73b87b7865e431ed89ead163b652.pdf
ER -