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Experimental Research on the Prestress and Static Behavior of a Cable-Strut Tensile Structure Model

A cable-strut tensile structure model with the diameter of 5.0m was designed and made to study the prestress and static behavior on the base of theory analysis. New schemes of the boundary compression ring, the cables and struts with the adjustable length, the connection nodes were designed and the least square method to fit the element force and strain curve was proposed. The initial prestress distribution and the responses of the model under full-span node load, half-span node load and 1/4-span node load were investigated. The experimental results indicate the cable-strut tensile structure will achieve the designed initial prestress while every element was tensioned to designed length. The outer planar stiffness of the structure is poor and easy to lost stability when subjected to asymmetric loads. The measured values and computed ones are almost consistent, which indicates the validity of the model design and the accuracy of the proposed methods.