The Analysis Of Dynamic Response For Pylon-Cable-Arch Structure

Nanjing Century Tower is the symbolic building on Kazi Gate Square. It is a kind Of typical Pylon-cable-arch structure on which all substructures are connected one another , combine into the whole, resist the forces from dead load , earthquake, wind, temperature together. However, the pylon belongs to oblique towering structure; the arch flexible arch structure; the cable special suspended cable structure. According to the information concerned , the analogous structure were adopted on the Alamilo Bridge in sevilla , spain and on the curved cable-stayed bridge on Golf Court in Xiaoye City , Bingbu country , Japan . At present , this kind of structure has not utilized all over the country yet.Nanjing, the region of basic seismic intensity 7, is an unfavorable site for anti-earthquake in terms of geological conditions according to seismic code for buildings. In this paper , the main problem to be solved is how three different substructures, subjected to seismic load, affect, restrict, couple one another.In this paper, Dynamic numerical analysis and shaking table test research of the Century Tower are carried out respectively . In the former, two computing modes of FEM are built, aimed at the coupling of variable-profile pylon, curved-axis arch and flexible cable. The software ALGOR FEAS is used to get the results of dynamic numerical analysis, such as natural vibration frequency, vibration mode, dynamic displacement, dynamic stress, which are compared with the results ofshaking table test research to draw to important conclusions. These conclusions provide not only potent basis for the design and construction of Nanjing Century Tower, but also reference for other pylon-cable-archstructures similar to the project.The pylon and arch are connected via the cable, which plays an important role in the whole structure. In this paper, the fundamentals of cable forces by frequency method are introduced. The curve fitting method is utilized to get the correcting formula of cable forces and frequency through the experiment. On the other hand, a kind of catenary line cable element is introduced in this paper, owing to the inaccuracy caused by correcting struss element in FEM .