STUDY ON SELF-VIBRATION CHARACTERISTICS AND SEISMIC RESPONSE OF LARGE-OPENING DRUM-HONEYCOMB-TYPE QUAD-STRUT SUSPEND- DOME STRUCTURE

The large-opening drum-honeycomb-type quad-strut suspend-dome structure is a new type of suspend-dome structure, which was improved from the traditional cable dome structure. It replaces the top chord of the cable dome with seamless steel pipes. The structure combines the characteristics of the suspend-dome and the cable dome. The bottom chord nodes connects four struts, two inclined cables and one ring cable. The Ansys finite element model is established to analyze the influence of initial prestress, rise-span ratio, thickness-span ratio, opening span and bottom chord arrangement schemes on the natural vibration characteristics of the structure, and three seismic waves are selected to analyze the seismic response of the structure. The results show that the 1-50 order natural frequency range of the structure is 1.038-19.796, the stiffness of the outer ring is stronger than that of the inner ring, the horizontal stiffness is stronger than the vertical stiffness, and the overall stiffness of the structure is good. The initial prestress, thickness-span ratio and opening span have great influence on the self-vibration frequency, while the rise-span ratio and the bottom chord arrangement schemes have the least influence. The seismic response analysis shows that the peak values of vertical nodes displacement are -44.75mm, -47.40mm and -45.27 mm, respectively, which are far less than the allowable deflection limit, the peak internal force coefficients of the members are 1.82%, 6.53% and 7.49%, respectively, and the variation range is within the allowable range, The large-opening drum-honeycomb-type quad-strut suspend-dome structure has good structural stiffness, and the strength of the inner ring members should be appropriately strengthened to resist the dynamic effects such as earthquake.