| Prestressed net shell-cable dome composite structure is a big span dome structure. At the bottom of the ring by prestressed steel nets shell since balance and top of cable domes. Self balanced prestressed nets shell is new-style structure, its structure unit consists of several lever and flexible rod composition and obtained by prestress stiffness, whole space reticulated shell when prestress can achieve self balanced, do not need to rely on main bearing structure or rigid ring to offset the rod pre-stress. Since the prestressed steel nets shell structure balance the stiffness and ordinary steel nets shell closer, flexible structure, cable domes belong to the two structure combination together, new combination structural dynamic performance will be different from prestressed steel nets shell since balance structure and cable domes structure. The whole of the dome's natural vibration period and modal analysis is necessary.This paper cable domes prestressed net shell-composite structure dynamic research. Using the ANSYS finite element analysis software, choose LINK8 and LINK10 unit, a finite element model of Lanczos method using Block which since balance prestressed cable domes dome-composite structure modal analysis. Through the modal analysis get cable domes prestressed net shell-the composite structure from the earthquake frequency and outer loads, prestressed cable domes dome-to have multiple composite structure is presented.the, so appear many similar frequency to figure, strikeout also appear more symmetrical shapes. This paper also respectively on the bottom of the combined dome structure of prestressed nets shell since balance ring structure and the structure of cable domes upper independence natural vibration period and modal are solved, and discusses the two parts of the dynamic properties of independent structure characteristics, analyzed the whole dome structure composed of two parts structure after vibration cycle and modal influence each other.
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