The Research Of Universal Structure Analysis System For Lattice Crane

The paper researches and develops universal lattice crane structure analysis system (CRASAS). An engineering project is analyzed and calculated by using the software. A finite element model of crane is built and feasible and optimal analysis is adopted for the model. The result after optimizing can be obtained.A tower crane is made up of plenty of beams and bars. Work capacity of modeling occupies 70 to 80 percent of whole work as analyzing structure of tower crane by finite element method. Development of CRASAS solves above problems. The CRASAS system provides visual pre-process interface. Users using the software are only required to input the controlling parameters, and can obtain a complete and accurate finite element calculation model. Users needn't establish the model themselves and the only thing required is selection.Interface of CRASAS includes enough information, and can provide cue and warning when problems happen. So it is convenient to use the software.Loading module of CRASAS avoids defects of concepts vagueness in universal finite element software. Loading concepts provided in the paper adopts universal terms in order to communicate. In loading interface, users only need to input point of load and data, so operation is convenient and fast.For mechanical analysis of tower crane, though universal finite element software, such as SAP84 and ANSYS, can afford the internal force and strain of the elements of a structure, tower crane belongs to special structures which are obliged to satisfy the special requirements, with respect of structural strength, rigidity and stability, prescribed in various national rules, such as GB/T 13752-92, GB3811-8, etc. Nevertheless, the check and verification of the above aspects are hard to complete through the universal finite element software, such as SAP84 and ANSYS. Feature of CRASAS is to solve the above work. As for tower crane, whose most structure members are slender and long bars, the control strain should be stability strain. The post-process program of CRASAS designed in this article checks the compound strain and calculates the stability of the bars specially according to the checking computation formulae afforded by the rule GB/T 13752-92. Through the verification of practical engineering projects, the program afforded by this paper is simple and easy to use, and the results from the program are accurate and reliable. By using the software, the developing cycle of productions can be shortened, manufacturing benefits and competitive ability can be improved. So the software has a very good application prospect.