【作者】 黄浩华； 戴君武； 战松梅； 吕雪峰；

【Author】 Huang Haohua;Dai Junwu;Zhan Songmei;Lv Xuefeng;

【机构】 中国地震局工程力学研究所；

【摘要】 5m×5m振动台基础以刚性块体集总参数建立六自由度振动方程,在多向力系作用下取基础面的加速度反应;地基参数采用弹性半空间理论、《动力机器基础设计规范》GB50040—1996和双峰法3种方法选取并进行比较;获取了3个平移向施加激振力后的实测数据与3种计算结果比较,弹性半空间理论计算结果与实测数据较为吻合;对属于大阻尼比的动力基础实测数据进行阻尼比和固有频率的求取提出了计算方法;并对现行GB 50040—96规范提出了修改意见。更多还原

【Abstract】 The vibrating equation of the six degree freedoms is established with the stiff block set for the foundation of the 5m ×5m shaking table,and the accelerated response of the foundation face is obtained at the action of the multi-direction force.The factors of the foundation is determined through by comparing the three method,which are the elastic half-space theory,code for design of dynamic machine foundation GB 50040—96,and the double-hump method.The results calculating from three methods are compared with the actual measured data,and it is confirmed that the result calculated by the elastic half-space theory is accorded with the actual measured data.The calculated method of the damping ratio and the natural frequency is proposed using the actual measured data for the dynamic foundation with the major damping ratio.In addition,the modifying idea is proposed for the current code GB 50040—1996.更多还原