摘要
本文从场地地震影响的概率讨论出发,分析了在(O,t)年时段内,各有效震源无地震,而在(t,t+△t)时段内,发生场地峰值加速度大于或等于给定位的地震的概率。文中用波松模型对不同时段的超越概率进行了计算,并用weibull模型进行了简化调整,得到如下结沦:若建筑物的使用年限△t不同,财在相同的场地峰值加速度下,得出的超越概率亦不同;若取相同的超越概率,则应按不同的△t调整其峰值加速度,从而采用不同的设防水平。
Proceeding from the discussion of the probability of field seismic inf- luence,this paper analyzed the probability of field peak acceleration being larger than or equivalent to the given value within the period(t,t+△t) and no earthquake happentning in the period(0,t)year.The over-stepping probabilities for different periods were calculated by Poission model and adjusted by Weibull model for simplification.It is concluded that,if the service life-span of building △t is different,the over-stepping probabil- ity is also different at the same field peak acceleration;the peak accel- eration should be adjusted for different△t and different seismic-proof le- vel should be Mooted if the over-stepping probability is the same.
关键词
结构抗震
抗震鉴定
建筑物
earthquake proof
estimate of Seismic-proof capacity
seismic reinforcement
over-stepping probability
