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为确定履带起重机桁架臂结构的薄弱杆件及杆件失效模式,首次将二分法与有限元软件二次开发技术相结合,给出一种确定薄弱杆件的简单有效的方法,并对桁架臂的薄弱杆件进行分析。首先,建立桁架臂的有限元参数化模型,利用二分法思想,通过不断迭代加载来改变作用在桁架臂上的载荷大小。其次,对桁架臂进行有限元分析,并提取每次加载后所有杆件的计算结果。最后,检查每根杆件的承载状态,直至桁架臂结构中某根杆件达到临界状态,从而确定出臂架结构的薄弱杆件。通过两个算例分析表明:理论分析结果与实际试验结果一致,验证了方法的可行性和有效性;压弯杆件是桁架臂的薄弱杆件,其失效模式为压弯失稳,在校核压杆稳定性时应该考虑杆件端部弯矩的影响。本文为桁架臂薄弱杆件分析和结构局部加强设计提供一定参考。
In order to determine the failure modes of the weak bar and bar of the truss boom structure of caterpillar crane, the dichotomy and the secondary development of finite element software were combined for the first time to provide a simple and effective method to determine the weak bar. The truss arm Weak rod member for analysis. Firstly, the finite element parametric model of truss arm is established. By using the dichotomy method, the load acting on the truss arm is changed by iterative loading. Secondly, the truss arm is analyzed by finite element method, and the calculation results of all the bars after each loading are extracted. Finally, the bearing condition of each rod is checked until a rod member in the truss arm structure reaches a critical condition, so as to determine the weak rod member of the boom structure. The results of two numerical examples show that the theoretical analysis results are in good agreement with the actual experimental results, and the feasibility and effectiveness of the method are verified. The buckling bar is a weak member of truss arm. The failure mode is buckling and buckling. The stability of the core strut should consider the influence of the moment of the end of the rod. This article provides some reference for the analysis of the weak member of the truss arm and the design of the local strengthening of the structure.