Finite Element Analysis And Seismic Influence Studies On The Structure Of Tower Crane QTZ630

Tower crane is special equipment commonly used in the construction of high-rise buildings. The design of tower crane is directly related to people's lives and property safety. At present, however, the traditional analogy and static calculation are playing main roles in the design and bringing tower crane some problems such as high weight, irrational structure and bad dynamic performance. So it has very important significant that a more effective method is used to analyze the static and dynamic mechanical properties of tower cranes accurately and provide a scientific basis for the rational design of tower cranes.In this paper, the software ANSYS is used to build the finite element model of tower crane QTZ630 in different height and attachment state. Then, the static mechanical characteristics of the crane are analyzed. The results show that the maximum stress of mast is far less than the material allowable stress. There is a larger safety redundancy in the mast of tower crane.The maximum displacement of tower crane increasing with its height.Based on the static analysis, the natural modes of the crane in no attachment state and two heights are also analyzed. The results showed that the first 8-order natural frequency of tower crane parametric model in two heights is same, and the corresponding mode shape only occurred on lifting jib or arm. The natural frequencies increase with the mast's height.In order to study the influences of seismic on the tower crane, the seismic acceleration loads are loaded on the no attachment crane with two different heights, and the time-history of response is analyzed respectively. The results show that the largest displacement at the top of tower crane and the maximum reaction force has a certain delay comparing with the acceleration loads. The maximum displacement at the top of the higher tower crane is larger than that of the lower one.