工程抗震设防标准若干问题的探讨

DISCUSSION ON SEVERAL PROBLEMS OF ENGINEERING ASEISMIG LEVEL

本文采用工程决策分析的方法,对城市的抗震设防标准进行了分析,探讨了有关直接损失、间接损失和不同地震烈度作为设防标准的工程造价等问题.根据一些城市的地震危险性分析结果,计算了以不同地震烈度作为设防标准的工程造价与期望损失的和.分析结果表明,我国城市的抗震设防标准可以以50年超越概率10%的地震烈度作为标准.但在50年超越概率10%的地震烈度为6.5°～6.8°、7.5°～7.8°、8.5°～8.8°范围内时,可根据该城市的地震危险性分析结果以及城市的规模等,结合城市的抗震设防区划进行工程决策分析,确定这类城市最优的抗震设防烈度或地震动参数.

In this paper, the aseismic levels of cities are analyzed by the engineering policy-making analytical method, in which the direct and indirect losses, as well as the engineering costs of various earthquake intensities taken as aseismic levels have been discussed. Based on the results of the seismic hazards of twenty cities, the sum oF the engineering cost and expected loss of various earthquake intensities taken as aseismic level has been computed. The results show that the seismic intensity with a 10% exceeding probability in 50 years can be taken as the aseismic level of a city in China. In case the earthquake intensity of a city with a 10% exceeding probability lies between 6.5°~6.8°,7.5°~7.8° or 8.5°~8.8°,the optimal fortification intensity and earthquake parameters of such a city can be determined by the engineering policy-making analysis of the results of seismic hazard and condition of the city combining with the aseismic fortification delimitation of the city.