弦支式互承网格结构受力性能试验及有限元分析

The reciprocal grid structures are a kind of spatial structures composed of mutually supporting bars. They have the characteristics of simple connections, quick construction and integration of structural skeleton with building skin. However, their structural stiffness is relatively small. The suspended reciprocal grid structures were proposed to improve the mechanical behavior of reciprocal grid structures without changing their topology. The structures integrated the reciprocal grid and cables by tree-like struts for composite actions. Taking a structural model with a span of 4 m as the object, the feasibility of the structures was verified and their mechanical behavior was demonstrated by a static loading test. The mechanical behavior of suspended reciprocal grid structures with an actual scale was studied by finite element analysis, and the influence of rise-span ratio and prestress on the structures was studied through parameter analysis. The research results show that the suspended reciprocal grid structure can reduce the displacement and stress of reciprocal grid. The displacement and stress of the gauging point decrease by more than 30% and 15% of general reciprocal grid structures, respectively. Under the uniform load, the maximum stress of the reciprocal grid has rotational symmetry. The stability capacity is higher while the displacement is much smaller than those of general reciprocal grid structures. The maximum displacement of suspended reciprocal grid structures decreases with the rise-span ratio. Excessive rise-span ratios lead to greater lengths of tree-like struts and the decrease of stability capacity.