Study On Form-finding Analysis And Aseismatic Behavior Of Beam String Structure

Beam String Structures (BSS), as a large-span prestressed space structural system which has been developed nearly decades, is a new hybrid structure. The research on this structure has also been one of the state-of-the-art researches in the recent years.In this thesis, the general Finite Element (FE) software ANSYS was used here to simulate a real case of beam string structure. As the one of the most crucial steps of BSS research, form finding calculation was performed first. The form finding method with the combination of geometry and mechanics was forwarded here to improve the disadvantages of classic form finding methods. Based on this method, the cable force can reach the requirement accurately when the structure finishes the form finding procedures. Meanwhile, the lost of prestressing force generated in the numerical methods can be avoided and the redundant trials can also be eliminated by choosing different methods. After the form finding calculation, the modal analysis of structure was also performed with ANSYS. The research results (e.g. natural frequency and mode shape) can be used as important parameters for reference in the seismic design of structures.Finally, the time history analysis of the beam string structure under seismic loads was carried out by using direct integration methods. The distributions of internal forces in the beam string structures under both static and seismic loads were analyzed here. Moreover, the comparison of the results generated by two different methods: response spectra and time history analysis was also performed in the research. The comparison research can provide useful information for seismic design of beam string structures.