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大型塔式起重机中通常是采用绳索系统调整臂架的幅度和塔身竖立定位的,在工作时绳索系统又是承载系统的一个组成部份。由于绳索系统变形较大,会引起臂架较大的转动。若要真实地反映结构的工作情况,应采用适应于大变形的几何非线性理论来计算位移和应力。几何非线性理论是基于平衡方程建立在变形后的几何位置。由于变形后的位置是未知的,这给问题的处理带来一定的困难和复杂性。为此,大变形分析还较少在起重机设计中应用。本文介绍DBQ3000型塔式起重机臂架结构的几何
Large tower crane is usually used to adjust the amplitude of the boom and the erection of the tower positioning rope system at work is an integral part of the load-bearing system. Due to the larger deformation of the rope system, will cause a larger boom rotation. To truly reflect the working condition of the structure, displacements and stresses should be calculated using the geometric nonlinear theory that is adapted to large deformations. Geometric nonlinear theory is based on the equilibrium equation established after deformation of the geometric position. Since the position after deformation is unknown, this brings some difficulties and complications to the problem handling. For this reason, large deformation analysis is also less used in crane design. This article describes the geometry of the DBQ3000 tower crane boom structure