| Crane is a type of the important engineering machinery, the cranes undertake the important task on lifting installation in nuclear power, chemical industry, port and other important areas. Crane boom is a typical slender truss structure. Such slender truss structure dimensions far greater than axial size, is a typical problem of large displacement and small strain geometric nonlinear. Booms of cranes are the important part by lifting the objects. Instability is the most important safety fector for slender truss structures.Based on co-rotational method, this thesis put forward with geometric nonlinearity method to research a type of slender truss structures. In accordance with the long and thin geometrical characteristics of slender truss structure, it will be divided into several substructures. Established coordinate system in the sub-structure, research the substructure’s relationship with coordinate system. By introducing rigid section assumption, based on the substructure method, the internal freedom degrees condense two centroids of the rigid section of substructure. Nonlinear equations of nodal force are got by node coordinate transformation. Based on the toad increment method, the differential equation is got by taking the derivative of the nonlinear balance equation. Relationship of load step length and displacement is got by solving the differential equation, and getting buckling loads by means of guidelines of buckling.Based on the above method, analysis software of the crane boom is developed on MATLAB platform and analyzes the stability and lifting performance of the crawler crane boom. The method this paper, is effective by analysis results. |
