水中桥塔波浪作用动力模型试验相似方法与模型设计方法

Similarity method and model design method for dynamic model tests of bridge tower under wave action

针对跨海桥梁桥塔结构波浪作用动力模型试验研究方法,通过分析水中结构动力模型试验相似原理,提出了桥塔结构动力模型试验的相似方法与模型设计方法。基于此,设计制作了一大型跨海斜拉桥桥塔结构的动力模型,并利用该试验模型进行了结构动力特性试验和波浪作用动力响应试验。动力特性试验结果表明:试验测得的结构主要自振频率与原型结构设计自振频率相接近,试验模型结构能较好地模拟原型结构自振特性。波浪作用下模型结构的基底受力和运动响应与原型结构相应的数值计算结果大致吻合。试验结果验证了提出的模型试验相似方法与模型设计方法的可行性,对跨海桥梁结构的水弹性模型试验研究具有应用和借鉴意义。

Aiming at the study method of wave action dynamic model test of bridge tower structure of a cross sea bridge,the similarity method and model design method for dynamic model test of bridge tower structure were proposed by analyzing the similarity principle of dynamic model test of underwater structure.Then,a dynamic model of tower structure of a large-scale sea-crossing cable-stayed bridge was designed and manufactured,and structural dynamic characteristics tests and wave action dynamic response tests were conducted with the test model.Dynamic model test results showed that the structure main natural frequency measured with tests is close to that designed for the original structure,the test model structure can better simulate natural vibration characteristics of the original structure;base forces and dynamic responses of the model structure agree well with the corresponding numerical results of the original structure;the test results verify the feasibility of the proposed model test similarity method and model design method,they have application and reference significance for the hydro-elastic model test research of cross sea bridge structure.