基于锤击法的弯连续刚构模型桥动力试验

Dynamic Test of Curved Continuous Rigid Frame Bridge Model Using Hammer Excitation Method

利用力锤冲击激励对室内弯连续刚构模型桥进行了模态试验,研究了基于锤击激励法模态试验的一些关键技术,采用模态分离技术进行了传感器的优化布置,同时建立了空间有限元模型进行了理论计算。理论计算值与试验值对比分析表明,两者结果最大相差不超过8%。这说明锤击法的模态试验是成功的,研究结果可为同类空间结构的模态试验分析提供参考。

In this paper the modal test using hammer excitation method was carried out for an indoor curved continuous rigid frame model.Some key techniques was discussed and optimal sensor placement was presented.Simultaneously,space finite element model was set up to calculate the theoretical modals,the results of which were compared with the experiments ones.They had an error of no more than 8%.It showed that the modal test using hammer excitation method was successful.The method presented can give reference to the similar spatial structure's modal test.