Shape State And Static Analysis For Pneumatic Membrane

With the development of modern construction technology, as well as fine chemicaltechnology, membrane architecture has boomed from the middle of the20th century,especially when ETEE membrane is widely used in large span buildings, which expand theinflatable membrane design, and application fields.Pnumatic membrane structure is a kind ofspecial form, has a unique architectural form, shape, and the corresponding structure system,tectonic system, etc.Pneumatic membrane structure is a kind of High-tech form which combine control andmanagement. Currently the methods of research and design for pneumatic membranestructures have made great progress, but the software professionally for the pneumaticmembrane analysis and design is rare. Based on these, the thesis compiles the program forform finding and static analysis by force density method and carries out the whole processanalysis for the pneumatic membrane.The development history, basic theory, FDM calculation will be introduced in the firstplace. And then analyses the internal air pressure in the shape state analysis of pneumaticmembrane. The internal air pressure is always the direction which is normal to membranesurface element so that the need to constantly modify directions when you do calculations isnecessary. This thesis start with energy balance theory, derive element force density matrixincluding membrane line element and T element under internal air pressure on the basis offorce density method, also these matrix message are stored by the method of variablebandwidth store. And concrete implementation method in the process of Finding-state is given,which effectively solve the divergence problem when calculated.In the load analysis section puts forward two parts of problem than need to figure out,which consist of the simulation of the internal pressure changes and wrinkle in the membrane.Then studies the law of changes in pressure and volume, as well as the way to solve structurevolume.Considering the change of pressure, setting the iteration accuracy, adoptingNewton-Raphson to solve the nonlinear equation.Finally the thesis detailedly analyzes someparameters under snow load and summarize its regularity, then make recommendations about the practical engineering design.