| Title |
A Comparative Study on the Buckling Characteristics of Single-layer and Double-layer Lattice Dome |
| Keywords |
Lattice Dome ; Shape Factor ; Rise-Span Ratio ; Buckling Characteristics |
| Abstract |
The buckling phenomenon of lattice domes occurs when the external force reaches at a certain quantity as the structure gets lighter or the cross-sectional area decreases. The buckling phenomenon depends on various factors, such as the geometric configuration, network pattern and the number of layers of structure. Since the number of layers are important factor of initial phase of design, on the first, the buckling characteristics of single and double-layer lattice domes are compared, secondly, the relation between buckling-strength-ratio and the ratio of member density is obtained according to rise-span-ratio and shape factor so that designers can have wide opportunities for choice. Analysis method is based on the Finite Element Method, taking the geometrically nonlinear deflection into consideration. As the result of this study, optimum rise-span ratio is 9/18 from the viewpoint of buckling-strength which is divided by member-density in both single-layer and double-layer lattice domes. The value of buckling-strength-ratio of double-layer to single-layer which is divided by member-density-ratio of double-layer to single-layer had a tendency to decrease with increasing rise-span ratio for the same member and with increasing slenderness-ratio of member for the same rise-span ratio, and turned out to be 1.1～2.0 according to shape factor. |