Research On Pseudo-static Test Of The Diagrid Tube Structure And The Performance Of Node

The structural system of diagrid tube is a new structural system with reinforcedconcrete tube and net tube consisting of two-way cross inclined columns. The specialstructural form of the net tube makes it greater lateral stiffness than the traditionalstructure. But the ductility of the diagrid tube is low, and the relevant research on it isnot sufficient. Based on this, the main content of the thesis is as follows:The thesis obtains the hysteresis characteristic curve and the skeleton curve by thepseudo-static low cyclic loading test on the small-scale model of the substructure of thediagrid tube, then gets the energy dissipation law, the deterioration of strength, ductilityfactor, stiffness degradation and yield order of the outer tube and so on.Next the thesis makes the numerical simulation of the physical test by ABAQUS,the result shows that the physical models and numerical models reach in goodagreement in the period of the linearity and in the result of the strain monitoring,thereby verify the validity of the results of the physical test. Through the numericalmodel, the yield order of components of the inner and outer tubes is the linking beamsof the inner tube,then the inclined columns, last the shear wall of the inner tube.Because of the particularity of the node of the diagrid tube structure, At thebackground of one example of the engineering, the influence of the internal diaphragmsettings of the nodes on the mechanical performance of the nodes is analyzed throughthe numerical simulation. And the result shows that the internal diaphragm setting in theupper flange surface and that in the slower flange surface both make a great influenceon the stiffness and capacity of the X-shaped and Y-shaped nodes.