众所周知,结构的优化设计比结构分析的难度要大得多,因为结构的优化设计与结构分析计算的有限元法相比没有广泛适用的方法,而必须结合具体问题研究最恰当的方法。在建筑机械的结构设计领域里,应用最为广泛的是杆系结构和平面应力膜结构。对于塔机来说,臂架、塔身均为杆系结构,底 It is well known that structural optimization is much more difficult than structural analysis because structural optimization does not have a wide range of applica- tions compared to structural analysis and computational finite element methods and the most appropriate method must be studied in relation to specific problems. In the field of structural design of construction machinery, the most widely used are the rod structure and the plane stress membrane structure. For the tower crane, the boom, the tower body structure is the end of the bar