| The Latticed Intersected Cylindrical Shell(LICS) is made by some groups of cylindrical shell through intersection, which has unique architectural modeling. Some deficiencies may restrict its engineering application, such as the concentration of distortion and stress, the huge reaction of bearing. This thesis puts forward the concept of Suspended LICS(SLICS) to improve the mechanics properties of LICS, and carries out the theoretical and experimental research. At last, the cable rupture of SLICS is analyzed by the Vector Intrinsic Finite Element method which is a new approach to structural analysis.The first chapter reviews the development, classification of spatial structure, as well as its application and development in China. The theory status of suspendome is summarized systematically. Furthermore the means of structural analysis and their history are generalized. The background and main contents of the thesis are introduced.Chapter2summarizes the new SLICS structure, and gives five ways to classify. The methods to introduce prestress are studied. It proposes the composition and expansion of prestressed LICS which is regarded as the basic component. By this way. the structure can cover greater area, and adapt to railway station canopy or industrial building that is multi-wave and multi-span.In chapter3, the static and dynamic properties of dodecagon valley style and ridge style SLICS are studied by ANSYS respectively. Besides, the effects of prestress level, shell member section, length of bar, rise-span ratio, and obliquity on static behaviors of SLICS are studied. The static properties of valley style SLICS, ridge style SLICS and suspendome are compared.Chapter4conducts the nonlinear buckling analysis of the two style SLICS, as well as the parameter study including prestress level, shell member section, length of bar, rise-span ratio, obliquity. The effects of material nonlinearity and initial imperfection on the stability are studied also. At last, the stability properties of valley style SLICS, ridge style SLICS and suspendome are compared.In chapter5, fundamentals and solution procedures of the Vector Form Intrinsic Finite Element(VFIFE) method is summarized systematically. The formulas of rod element are introduced afterwards. Example of instantaneous hinge is given to prove the efficiency. The tensioned linear cable element and parabolic cable element are proposed and verified. The VFIFE is introduced to the analysis of complicated spatial structure with cable, bar and beam. The static behavior of valley style SLICS is studied by MATLAB program based on the VFIFE. And the results are compared with the ANSYS to prove the efficiency.Chapter6introduces the foundation of elastoplastic material model and fracture mode. It is proved to be feasible through a specific numerical example. Because of the advantage of the VFIFE in nonlinear analysis just like large deformation and large displacement analysis, it is useful to cable rupture analysis. And some valuable conclusions are obtained at last.In chapter7a SLICS model is designed for the validation of the mechanical behavior of the new structure. Experiments on prestress tensioning, loading in full-span and half-span, cable rupture are carried out. The results of theoretical and experimental research are compared.The last chapter gives the summary and some future research topics. |
