エネルギー集中型多層骨組における D_s 値

抄録

Any structures under earthquakes are exposed to the energy input due to earthquakes. The energy input depends only on the total mass and the fundamental natural period of the structure. The essentials of the earthquake resistant design must be aimed to establish the method which makes it possible for the structure to resist to the energy input. When the energy input is dispersed evenly over the entire structure, the energy distributed to a part of the structure becomes small and structural members can easily resist to the energy. In this case, however, it is rather difficult to estimate a probable distribution of the energy. On the other hand, when the energy absorption is bound in the first story of the multi-story structure, the first story must burden the concentrated energy input, but the other part of the structure can be released from the requirement for the energy absorption. In this paper the latter case is genrally discussed and the design criteria for the structure the first story of which is relatively soft and can absorb almost all of the energy input through elastic-plastic deformations and damping devices are presented.