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Study on the Dynamic Stability Characteristics of Three-dimensional Frame of Single Layer Elliptical Parabolic Latticed Dome

Author: YuXueLing
Tutor: WenMing
School: Nanchang University
Course: Structural Engineering
Keywords: Three-dimensional frame of single-layer elliptical parabolic latticed dome finite element Ansys load-displacement curve ultimate bearing capacity dynamic stability
CLC: TU399
Type: Master's thesis
Year: 2009
Downloads: 14
Quote: 0
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Abstract


As a novel spatial structure, reticulated dome are more and more widely be used. With the light weight, works fast, sleek, simple calculation, comprehensive and good economic indicators,it is increasingly the attention of many experts and scholars , the dynamic stability problem is more and more be attended.The article is focused on the dynamic stability of Three-dimensional Frame of Single-Layer Elliptical Parabolic Latticed dome through the finite element method. Research the dynamic characteristics by the maximum displacement when the dome is forced load. Through peak value of acceleration of load versus max. displacement of structure to found the dynamic critical load value and the balance point of structure. Every point on the curve means the maximum displacement of the structure under some load. And each load corresponds to a nonlinear dynamic analysis, drawing load amplitude-maximum displacement curve of the structure by progressively increased load as a parameter. If the curve changes is uniform, it means the dome are s:tabile;And if the curve changes is abrupt,it means the dome will be instability. So the curve can describe the instability of the whole dome.It researched the fundamental frequency、the dynamic stability under simple load and earthquake, providing the theoretical basis for engineering application. The main study are as follows:1、adopting Ansys language to develop a finite element program for the mode of Three-dimensional Frame of Single-Layer Elliptical Parabolic Latticed dome;2、On the basis of the different parameters such as various span、span ratio、roof load and the bar section, the paper analyzes the fundamental frequency and vibration mode of Three-dimensional Frame of Single Layer Elliptical Parabolic Latticed dome. comparing the different circumstances of the natural frequency and vibration mode under the same conditions, reflecting the net changes in the frequency of the dome. With the increase of length-span ratio the frequency reduce, with the reduction of span ratio the frequency reduce, With the increase of roof load the frequency reduce, and with the increase of bar section the frequency raise.3、compares the dynamic characteristics of dome under horizontal step load and vertical step load.4、study the dynamic stable characteristics of dome under simple load, and finding a great difference about ultimate load and carrying capacity beween resonance region and non-resonant region.5、investigate the dynamic stable characteristics of dome under horizontal earthquake、vertical earthquake and three-direction earthquake.6、drawing the ultimate load change curve about different length-span ratio and different bar section of dome.7、analyze the carrying capacity about with or without initial geometric imperfection and different support condition of dome.

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