耐震建築物の限界状態と破壊規範式

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The current seismic design code is composed of serviceability and ultimate limit states. These limit states, however, are only the lower and upper bounds of the scope of reliability assessment. Some important limit states, such as large crack initiation limit state and repairability limit state, can be imposed between these two limit states. From this viewpoint, an optimum earthquake resistant structure may be designed on the concept that the expected cost of damage caused by the structural response which exceeds an imposed limit state during its lifetime should be constant irrespective of the limit state. This optimum principle provides a rule that the allowable probability of exceeding an imposed limit state is inversely proportional to the square root of the damage cost associated with the limit state. In order to practice this optimum earthquake resistant design, a unified method is necessary for determining the probability of exceeding an arbitrarily imposed limit state between serviceability and ultimate limit states. This paper showed that a unified equation for reliability assessment is given in the form of R≧Q by using energy parameters, in which R is the energy capacity of the structure limited by the imposed limit state and Q is the maximum earthquake energy input during the structural lifetime. Here, Q is represented by a product of structural response term Q_0 and seismic hazard term I_<Emax>. Thus, the criterion form is trasformed into R/Q_0≧I_<Emax>. This simple form enables us to calculate the probability of exceeding any imposed limit state, because structural term R/Q_0 and seismic hazard term I_<Emax> are formulaically separated and they are statistically independant.
社団法人日本建築学会の論文
1988-05-30

耐震建築物の限界状態と破壊規範式

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