Behavior Simulation And New Mechanical Modeling Investigation Of Short-leg Shear Wall Structure

As a new structure system, the short-leg shear wall structure has the virtues of abnormity frame columniation structure and shear-wall structure. But, now basic dynamics capability of this structure is realized little, and computing analysis method is not full-blown to this structure. So, these factors affect this structural generalizing and application. We must develop deep meticulous study.Firstly, this paper based on computer simulation theory and with currency finite element software, the simulation test has been done on L-shape, T-shape and -shape short-leg shear wall structures, with humdrum lording manner. In simulation analysis, a spatial block unit that has eight nodes and 24 degrees of freedom composes short-leg shear wall structure finite element model. In simulation test, L-shape, T-shape and -shape sections short-leg shear wall structures are respectively divided into four groups according to sectional depth to thickness ratio, ratio of axial compressive force to axial compressive ultimate capacity of section, couple beams span to depth ratio and building stories, how these factors affect the load-carrying and deformation of these structures is analyzed. Test analysis indicates that flanged-wall of L-shaped and T-shaped sections short-leg shear wall structures integrated capability are evident better than non-flanged wall of -shaped structure. To these three genus section shaped, couple beams span to depth ratio influences much more evident than other factors to craze lord, while sectional depth to thickness ratio and couple beams span to depth ratio influence much more evident than other factors; to utmost lord. With influence of deformation capacity, to flanged-wall short-leg shear wall structures, sectional depth to thickness ratio and ratio of axial compressive force to axial compressive ultimate capacity of section affect more evident to utmost displacement, but to non-flanged wall short-leg shear wall structure, sectional depth to thickness ratio and couple beams span to depth ratio affect more evident to utmost displacement. Whatever the sort of sections short-leg shear wall structures section shapes, to craze displacement and maximal relative storm displacement, four factors influence much less than to utmost displacement. And, by floor- relative storm displacement curve analysis indicating, structures maximal relative storm displacement appearing fifth or sixth floor indicates that short-leg shear wall structure is also weakness floor, and at the same time indicates that fifth or sixth floor is weakness floor to structure model of text. So some measures should be taken in engineering design.According to basic theory of computer simulation, in succession, T-shape and L-shape abnormity wall-element displacement model is put up, considering the effect of shear-lag, distortion and torsion, and then space element stiffness matrixes are derived by variational principle. With derivation of element stiffness matrixes and structure stiffness equation, relative storm displacement of fifth floor and sixth floor are; determined, and then making use of some methods restricting these displacements. Then considering the floor of space coordination, and then the structure dynamic equation is derived. With the Hamiltonian system of state space theory, the structure state equation is derived, and then with laplace transform, the solution of state equation is derived. The state transfer matrix is developed with Taylor, finally the transfer formula of dynamic response history is derived, and the analysis of step is given.