Model Test On Damage Sensitivity Of Cable-stayed Bridges

The bridge structure is constantly developing in the direction of large span and softening.The cable-stayed bridge is widely used in the construction of large-span bridges because of its higher ability of crossing and beautiful shape.However,with the increase of service time and the impact of the external environment,its damage will be inevitable,which is a direct threat to people's lives and property.The study of health monitoring and diagnosis of large-scale structure has become a hot topic in the academic and engineering circles at home and abroad.However,there are few researches on the long-term health monitoring using the large-span cable-stayed bridge model.First of all,this article refers to the basic information of the world's long-span cable-stayed bridge,and designed to a detachable cable-stayed bridge test model to assure a service in health monitoring research.The numerical model assorting the model is established by using the finite element software.The static and dynamic characteristics of the test model are preliminarily confirmed by the analyzing of finite element software,and the sensor arrangement for the experimental parameters is discussed.Secondly,the static load test is carried out on the test model.The consistency of the experimental model and the finite element model in the static response is clarified by referring to the finite element calculation results.Then,with the optimization of the cable force calculated by the finite element method,the cable tension is adjusted to the calculated value under the condition of the counter weight of the test model,and the model with the cable force is taken as the non-destructive state,and the static parameters of the observed values are recorded again,meanwhile the natural frequency of the non-destructive model is observated.Finally,the damage simulation experiments were carried out and completed in nine different damage conditions.The static and dynamic response characteristics of the structures under various damage conditions were recorded and compared with the static and dynamic parameters of the non-destructive model.,The changing rule and the characters of sensitivity of the bend and the stiffness of the stiffening beam.he cable-stayed forcef and the natural frequency of the structure under several different structural damage conditions are analyzed,moreover the health diagnosis technology to the long-span cable-stayed bridge is discussed preliminarily.