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Basic concepts In inflatable structures, they can be supported by air (large covered spaces of which membrane is hold in place by the overpressure of the interior with respect to the outside) or in the form of pneumatic structural elements inflated to pressures much higher than the previous ones like arches, bars, etc. . WinTess3 and pressure an action of pressure in WinTess3 program is applied through the window of surface loads which can …Read More

Pneumatic Tube

Pneumatic tube is the form generated by an axis (line in 3D) and a circular cross-section of constant radius. At the moment, WinTess3 finds form of only closed pneumatic tubes.           When we use the menu File | New | Pneumatic tube, the program displays the parameter window of the tube. First of all, we must enter the axis of the tube, by importing a 3D closed polyline that was previously …Read More

Pneumatic structures and internal pressure

One of the forms of pretensioning a membrane is to overpressure of the interior air. When a membrane is subjected to an air pressure has a certain curvature, this pressure causes the membrane a stress that is proportional to the curvature. So, if it’s a membrane of cylindrical shape, with a certain radius of curvature R, T tension caused by the internal pressure P will be T = P x …Read More

Creating a cushion

With the advent of ETFE in the world of lightweight construction, cushion creation has become a common strategy. A cushion is a set of two membranes: one upper and one lower. Therefore, the best way to approach this creation in WinTess3 is to create the two separate membranes and then put them together. Suppose that we want to build a cushion of 4 x 10 m with a height of …Read More