Analysis Of Influence Of Prestressing On Dynamic Characteristics Of Concrete Structure

In recent years, the technology of prestressed concrete structures has been extensively used in the field of civil engineering. The scholars, in the domestic and foreign countries, have been expanding extensive research works, have obtained massive research results in both static performance and the design calculation about prestressed concrete, and many achievements have been used to instruct the project practice. With the constructional engineering discipline development, the dynamic analysis and numerical simulation are also increasingly important. Based on practical engineering, the finite element of the dynamic characteristics of prestressed concrete structure is analyzed.A prestressed concrete beam was firstly studied, then it analyses theoretically the influence of frequency by the pre-tension, and the frequency of different prestressing cable shapes was compared. Then numeric analysis of the dynamic performance of a prestressed concrete beam was carried out by general finite software ANSYS. The results showed that the frequencies go up with the prestressing force, the influence of the dynamic performance with prestressing force was little.Based on Zhengzhou railway station, finite element dynamic mode of appropriate structure was established, modal analysis was carried out. The frequencies were compared to the existence or not of prestressing values. The results indicate that the changes of frequencies were little with the existence or not of prestressing. Then the model with prestressing was carried on dynamic numeric simulation by train moving load and drawn a good conclusion.The paper aimed to study whether the Zhengzhou railway station simplified model was reasonable, finally drawn a conclusion that the influence of the dynamic performance with prestressing force was little, and provided evidence for practical engineering structures.