Abstract
According to existing rigid roofing projects, a new structure called the Levy hinged-beam cable dome is proposed. By replacing the upper flexible cables with hinged beams, rigid plates can be installed overhead. To fulfill the requirements of integral tow-lifting construction, the setting criteria for the temporary hinged joints on ridge beams were presented. An 8-m diameter specimen was manufactured and monitored to investigate the structural configurations during the accumulative traction-hoisting construction process. Finally, the specimen was tested under full-span and half-span loading conditions, while a numerical model was built to verify the experimental values. The results show that in the early stages of traction-hoisting, the structure establishes the overall prestress and finds its internal force balance, while the entire structure is in a shape of “ω”. As the component’s internal force increases during the construction steps, and the local deformations of the hinged beams gradually decrease, with the entire structure changing from “ω” to “m”, and finally reach their designed states. Under full-span loads, large local deformations occurred at the HB-3 hinges, while the bending stresses of these hinged beams were relatively small. Under half-span loads, the loading part exhibits a downward appearance, while the unloading part exhibits upward deflection.
Highlights
In recent years, large spatial structures have been used in many stadiums [1,2], convention centers [3], the waiting halls of airports, and other public buildings
The results indicate that accumulative traction-hoisting construction technology could be used to realize the entire construction process of the Levy hinged-beam cable dome, and the numerical model ensures the accuracy of the simulation
In the last stage of tensioning, small variations occur in the vertical displacements of the struts, while the forces of the cables and beams increase rapidly, the local deformations of the hinged beams gradually decrease, the overall prestress of the structure is established, and the whole structure changes from the initial relaxed state to the designed state
Summary
Large spatial structures have been used in many stadiums [1,2], convention centers [3], the waiting halls of airports, and other public buildings. The poor thermal insulation, poor environmental pollution resistance, and relatively higher price limit the application of pretensioned membranes under heavy loading conditions and limit the promotion of cable domes Rigid roofing components, such as glass panes [15], steel plates [16], reinforced concrete slabs [17], and composite sheets [18], have been widely used in steel frames. Based on the idea of existing designs, a Levy hinged-beam cable dome, which is suitable for rigid roofing systems with a relatively larger sectional stiffness of the upper components, lower pretension forces, and smaller local deformations, is proposed in this paper. By tests under a full-span load case and a half-span load case, the static behavior of the structure was obtained and compared with the results of a finite element analysis
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