概率地震危险性评价系统开发

工程建设时必须对工程场地的地震危险性进行评价,并且对工程结构物要采取抗震设计。由于相关部门往往针对某一地区只提供一个地震设防加速度范围值或地震设防烈度值,而且某一地震烈度值所对应的加速度值的范围也很大,使得在实际应用中给具体工程安全、经济地选用合适的抗震设防加速度带来一定困难;为解决这个问题,本文以概率地震危险性评价理论为基础,开发了一套地震危险性评价系统。利用该评价系统根据相关地震活动性参数,可以方便、快速地计算出具体工程应该采用的抗震设防加速度值,从而解决了工程活动中安全、经济地选用抗震设防加速度值的问题。文中还针对潜在线源和潜在面源的处理难以在程序上实现这一难题,分别提出了一种精确求解和近似求解的算法。本文并以实例进行了评价计算,计算结果与中国地震局公布的数据符合较好,从而验证了开发的评价系统具有较好的可信度。

DEVELOPMENT OF PROBABILITY SEISMIC HAZARD ASSESSMENT SOFTWARE SYSTEM

The seismic hazard of sites must be evaluated and aseismatic design must be adopted for structures before projects are constructed. It is difficult for engineers to choose the appropriate acceleration of earthquake-resistance for projects safely and economically in actual application. This is because only a scope of acceleration of earthquake-resistance or earthquake intensity is provided for a region by relevant departments in China. Additionally, the range of acceleration corresponding to an earthquake intensity is very large. In order to solve the problem, a seismic hazard assessment system is developed based on the probability seismic hazard assessment theory. The acceleration of earthquake-resistance for projects can be calculated conveniently and quickly using the assessment system developed according to correlative earthquake activity parameters. Consequently, the problem of choosing the acceleration of earthquake-resistance safely and economically can be solved well. In this paper, an accurate solving algorithm and an approximate solving algorithm are given respectively toward the problems of a line-source and an area-source. The two sources have difficulties to be handled in programming. Some assessment calculations are given with examples. The calculation results are consistent with these data promulgated by China Earthquake Administration (CEA). Therefore, the reliability of the system developed in this paper is proved to be good to some extent.