边界条件和配筋率对设备支墩动力特性的影响

Effect of boundary condition and rebar ratio on dynamic properties of device rest pier

对一大型天文望远镜设备支墩建立了有限元分析模型,进行了自振频率计算．结合实测数据和一系 列计算模型,分析了边界支承条件和墩体配筋率对其自振频率的影响．指出对于此类支承于基岩上的设备 支墩,基础底板的锚固措施对其自振频率具有较大的影响;对于此类兼有弯曲和剪切变形特征的低矮悬臂 支墩,纵向配筋和横向配筋都可以提高其自振频率,但效果不显著．

The finite element model of a large - scale astronomical telescope rest pier was established for calculation of its natural vibration frequencies. Based on the measured results and several alternative modeling, the effects of boundary condtion and rebar ratio on the dynamic properties was revealed, i.e., the anchorage method of base plate has great influence on its natural vibration frequencies of such type of rest pier located on rock; the logitutional and transverse rebar can increase the natural vibration frequencies , but for sauqt cantilever pier which has both bending and shearing deformation, the effect is not obvious.