Research On The Static Behavior And Dynamic Characteristic Of Ribbed Type Mega-latticed Suspen-dome Structure*

Reticulated mega-structure is a double-system spatial structure, formed bymain-structure and sub-structures. the mega-latticed suspen-dome structure is formedby triangular section ribbed spatial trusses, struts, and stretching cables. Theoretically,the mega-latticed suspen-dome structure is well-performed in mechanical behavior andmaterial utilization.The ribbed type mega-latticed suspen-dome structure is the main target toresearch in this paper. The geometrical form parameters of structure are analyzed. Andthe validity of the modeling and analysis method is verified by using finite elementsoftware ANSYS.Based on the nonlinear finite element theory, the static behavior of ribbed typemega-latticed suspen-dome structure is studied to summarize the internal forcedistribution laws of main components of the mega-latticed suspen-dome. And themega-latticed suspen-dome structure and spherical reticulated mega-structure arecompared to draw the conclusion that mega-latticed suspen-dome structure improvesthe mechanical behavior of spherical reticulated mega-structure effectively.The elastic stability performance of ribbed type mega-latticed suspen-domestructure is analyzed in detail though the non-linear load-displacement full-processanalysis method. The load-displacement path of the structure is analyzed by using theNewton-Raphson and Arc-length method. For comparison, the elastic stabilityperformance of spherical reticulated mega-structure is also analyzed. The impact ofgeometrical form parameters and cable arrangement modes on elastic ultimateload-carrying capacity of ribbed type mega-latticed suspen-dome structure are studied. Meanwhile, the adverse effects of initial geometric imperfection and asymmetric loadpattern on elastic ultimate load-carrying capacity are estimated.The dynamic characteristics of ribbed type mega-latticed suspen-dome areanalyzed by using Block Lanczos method to solve the frequency and mode shape. Anda series of parameter analysis are carried out for the alteration regularity of naturalvibration of the structure.Considering the impacts of rise to span ratio, spatial truss height, stretching cablesangle and cable arrangement mode on the static behavior, elastic stability performanceand dynamic characteristic of the structure, the rational range of several parameters issuggested for structural design.