【摘要】 针对中国现行双参数场地分类法不能反映土层结构的问题,提出了利用可反映土层结构的场地基本周期估算公式进行改进的方案。通过改写现行土层等效剪切波速计算公式的形式,指出利用子层周期求和法计算场地基本周期是造成现行场地分类法存在问题的症结所在,提出了利用可反映土层结构的场地基本周期公式对其进行替换,形成新的土层等效剪切波速计算公式。结果表明,新公式计算的土层等效剪切波速变化规律和反应谱特征周期变化规律相一致,而从规范公式所得的结果却无变化。因此,新公式比规范公式更能灵敏反映场地特征的变化。更多还原

【Abstract】 The current site classification in China could not reflect the soil layer structure,in order to solve this problem,a site fundamental period estimation formula which could reflect soil layer structure was introduced to modify the current site classification scheme. By rewriting the calculation formula of the current soil layer equivalent shear wave velocity,the crux of the problem was pointed out that the site fundament period was calculated by sub- layer periods summation method. The method was replaced by a site fundamental period formula which could reflect soil layer structure,and then a new calculation formula of soil layer equivalent shear wave velocity was put forward naturally. The results show that the change rule of soil layer equivalent shear wave velocity calculated from the new formula is consistant with that of response spectrum characteristic period,but the results form current formula kept constant. A conclusion could be drawn that the new formula could more sensitively reflect the variation of site properties.更多还原