Straight double wall fabric mechanical properties analysis

Double wall fabric is a new type of inflatable structure, which has been widely used in surfboards, inflatable boats and other places in sports, and may also be used in some special construction fields. However, the mechanical properties of the new structural plate are not clear, which hinders the application and popularization of this structure. In this paper, the experimental research and numerical simulation analysis are carried out. The effects of the thickness of the inflatable panel, the internal pressure and the thickness of the membrane material on the stiffness of the inflatable panel were studied. The deflection formula of midspan is obtained by theoretical analysis and polynomial fitting. In this paper, the space cloth inflatable panel is applied to the design of special roof panel to study its structural mechanical properties.

First of all, the elastic constants of the double wall fabric materials were obtained by tensile test. Based on the experimental study of one-way slabs with simple supports at both ends, the load displacement curves, fold loads and ultimate loads under different internal pressures are obtained.

Secondly, the finite element model with the same size as the test is established, and the numerical simulation results are compared with the test results. The correctness of the finite element model is demonstrated from two aspects: fold load and mid span load displacement curve.

Then, the calculation formula of fold load is deduced and verified by the finite element simulation results. The effects of the thickness, internal pressure and membrane material thickness on the stiffness of the inflatable panel were studied. The expression formula of midspan deflection is derived, and the relationship between equivalent shear stiffness and internal pressure is obtained by polynomial fitting. The calculation formula of midspan deflection is verified.

Finally, the spatial inflatable panels are applied to the design of special roof panels to study the distribution of the maximum displacement and displacement of the structure under the snow load and wind load. The influence of different cable arrangement forms on the maximum displacement of the structure is compared and analyzed to optimize the cable arrangement form.