Simplified Method For Nonlinear Analysis Of Crane Combined Boom System

In order to satisfy the hoisting of large-scale prefabricated components such as wind power and bridges,all-terrain cranes have been widely used in large-scale construction such as wind power and bridges.In order to further meet the requirements of the hoisting height of large prefabricated components,a combined boom composed of a box-shaped telescopic boom,a lattice-type luffing jib,and a super-lifting device has become a standard key component of an all-terrain crane.Because the combined boom structure is a typical statically indeterminate structure,it also has spatially symmetrical super-lift cables,jib luffing cables,etc.,making the mechanical analysis of the combined boom structure very complicated.At this stage,the mechanical analysis of the combined boom structure mainly uses finite element simulation software,but the use of finite element software to model the combined boom is too complicated,which is not conducive to the initial design calculation of the combined boom structure.Therefore,this paper proposes a simplified method for nonlinear analysis of the combined boom system of an all-terrain crane in order to improve the calculation efficiency of the initial design of the combined boom structure.The main research content and methods of the thesis are:(1)Use the equivalent moment of inertia method to equate the complex lattice structure into an equivalent solid web structure,and use the finite element analysis software ANSYS to perform linear buckling analysis on the actual model and the equivalent solid web structure,and calculate the two models The critical load value and error analysis.(2)Perform nonlinear buckling and nonlinear full-process analysis on the actual complex lattice structure and equivalent solid web structure,and obtain the load-displacement curves of the two structures with different slenderness ratios,and the load of the two structures-Comparative analysis of displacement curves.(3)According to the working principle of the all-terrain crane combined boom system,the combined boom system composed of the telescopic main boom,lattice jib,super lift device,cable,etc.is equivalently simplified,and an equivalent combination is established For the boom model,the units and equivalent processing methods used in the nonlinear analysis of the complex actual model and the equivalent simplified model are given.(4)Carry out linear analysis of the various parts and the overall structure of the all-terrain crane,compare the errors between the actual structure and the equivalent solid web structure under the same load;compare the actual structure and the equivalent solid web structure Perform nonlinear analysis,draw load-displacement curves,and compare and analyze the load-displacement curves of the actual structure and the equivalent solid web structure.The research results show that the simplified analysis method for nonlinear analysis of the all-terrain crane combined jib system is feasible,can meet the needs of the initial design of the combined jib structure,and can effectively improve the efficiency of the design and calculation of the all-terrain crane combined jib.