The Analysis On Vibration Characteristics And Dynamic Performance Of The Suspen-dome Structure

Suspen-dome structure, is a kind developed of large-span prestressed spatial structure system in the middle of20th century, belongs to a new type of composite space structure. It is through the compression strut to compression of the upper shell and the lower metal net brace system together, and on cable prestress value, make the structure produces the arch effect, after applying the roof load, back to a structure from the equilibrium state of a kind of prestressed spatial structure. Because of its reasonable force, it get more extensive application in the engineering practice, both at home and abroad. The suspen-dome structure are reviewed in this paper the characteristics and research status quo, as the research object, with specific engineering example for large span string vault structure of the natural vibration characteristics and structural dynamic performance did a systematic research on the job.Taking Jinan Olympic sports center stadium roof structure as the research object, using the finite element software ANSYS APDL language of the couplet Kiewitt-Lianfang type to string vault structure to realize parameterized modeling; Using structural dynamics theory for string vault structure natural vibration characteristic analysis, understand the string a dome structure of each order frequency and the corresponding vibration mode distribution, and on this basis, the research on the high quality of roof, the initial prestress, vector, number of poles and the bearing constraint strings for different parameters, such as the influence of the natural vibration characteristics of a dome structure. String dynamic time history analysis method are used and then to research the dome structure in horizontal earthquake action, the vertical seismic action, and two to the seismic action in structural dynamic performance, and considering different parameters, such as initial prestress, vector is high, the number of poles and the bearing, the string a dome structure dynamic performance of the impact of changes.Studies have shown that suspend-dome structure of spectrum is relatively dense, complex vibration. Among them, the structure of vector high size and how much the number of poles is evident influence string of dome structure dynamic performance factors. The size of the initial prestress value on the improvement of the structure dynamic performance and has no obvious effect, but prestress in the presence of a great influence on structure natural vibration and dynamic performance; But for prestressed, play a role of just make net shell structure together with the cable support system is to form a whole to participate in the structure.