【摘要】 振动容量达40gt和振动负载达1t的大型动力离心机国际仅2台,分属美国和日本,我国目前为空白,这与当前高速发展的土木工程建设和严峻的地震形势不相匹配。振动容量40gt大型动力离心机建设经验匮乏、设备组成庞大、振动扰力高、频率成分复杂,设备基础稳定性与下层空间形态目前尚存在争议。基于质阻弹理论和弹性半空间理论,考虑主体设备布局结构和设备基础振动荷载条件,建立两种基础振动分析模型,并分别就下层条形和圆形两种空间形态,对设备基础稳定性进行研究。分析结果表明,两种空间形态均能满足基础振动稳定性要求,以往经验认为条形更稳定的认识有误;在同等共振峰值下,圆形空间能够提供更多设备安装和人员操作空间,更具优势。更多还原

【Abstract】 Currently only two large scale dynamic centrifuges with shaking capacity of 40gt and shaking mass above 1t have developed in USA and Japan respectively.Nevertheless no one can be available in China,which situation remarkably lags behind the domestic rapid civil engineering construction and serious seismic conditions.Due to lack of construction experience,largeness of equipment composition,hugeness of vibration force and complication of frequency component,issues arise over the foundation stability and bottom space form to the large scale dynamic centrifuge with shaking capacity of 40gt.By investigating the layout structure of principal equipments and the loading condition of machine foundation vibration,two different foundation vibration models with analytic methods are respectively developed based on the mass-spring-damper theory and the elastic half-space theory,which are utilized to study a machine foundation stability with a round bottom space and a narrow rectangle bottom space.The analytic results show that the stability of foundation vibration with bottom space in both forms all can satisfy the design requirement and the experience standpoint of a narrow rectangle bottom space better for foundation stability is incorrect.Simultaneously under the same resonance amplitude,a round bottom space is advantageous to offer more space to equipment installation and staff operation.更多还原