本文首先介绍了结构在使用期内(取50年)地震直接经济损失期望值的计算公式,之后以北京地区为例,计算出北京地区发生6度、7度、7度半、8度、8度半、9度、10度地震的概率分别为:43.3%、17.5%、11.1%、5.9%、2.7%、1.4%、0.1%。并根据震害经验确定的建筑物破坏概率矩阵,计算出震后直接经济损失期望值。 This paper first introduces the formula of expectation of earthquake direct economic loss during the service life of the structure (taking 50 years), and then takes Beijing area as an example to calculate the occurrence of 6 degrees, 7 degrees, 7 degrees, 8 degrees, 8 degrees The probabilities of earthquakes of half, 9 and 10 degrees are 43.3%, 17.5%, 11.1%, 5.9%, 2.7%, 1.4% and 0.1% respectively. According to the damage probability matrix of buildings determined by the experience of earthquake damage, the expected value of direct economic loss after the earthquake is calculated.