【作者】 徐锡锋；

【导师】 程文明；

【作者基本信息】 西南交通大学 ， 机械设计及理论， 2013， 硕士

【摘要】 桥门式起重机的主梁是整机结构最重要的部分,且占据了整机结构的很大部分重量。其广泛应用于港口码头、货场搬运、结构安装等,在国民经济中起着至关重要的作用,为促进全社会的发展做出了突出贡献。欧式起重机偏轨箱梁大隔板的布置间距比我国大,结构简洁、轻便、寿命长、可靠性高。因此,对其主梁结构的研究具有非常重要的实际意义。本文研究对象为偏轨箱型双梁桥式起重机主梁结构及其横向加劲肋,研究工具为ANSYS有限元分析软件,研究的主要工作内容为：编写主梁的APDL参数化计算程序,包括建模、加载、约束、刚度计算、强度计算、屈曲稳定性计算及约束扭转计算；研究载荷作用于主梁跨中时,箱梁横向加劲肋和箱梁自身尺寸参数之间在偏轨箱梁的刚度、强度、屈曲稳定性及约束扭转等方面的耦合机理。研究过程为：编写APDL参数化计算程序—根据研究的需要建立相应有限元模型—进行有限元计算—对计算结果进行总结。针对某一偏轨箱型双梁桥式起重机主梁,研究结果表明：加劲肋间距对主梁抗弯刚度的影响很小,且无明显规律；加劲肋间距为某一值时(这里为4.8m),主梁下翼缘板各节点应力曲线汇交于某点,下翼缘板跨中应力分布最均匀,平均值为70.0875MPa；箱梁主腹板厚度与其稳定性间的函数关系可用幂函数表达,表达式为y=288.69X2.7922,相关系数0.9988；若箱梁腹板高度增大,其屈曲特征值将减小；若箱梁加劲肋间距增大,其特征屈曲值将减小,且随加劲肋间距的增大其特征屈曲值减小的过程逐渐变缓。针对本箱梁,加劲肋间距在2.0m-6.0m范围内,箱梁特征屈曲值下降较为平缓,且下降趋势近似为线性；加劲肋间距增大会导致箱梁抗扭刚度减小,但影响不大；无约束扭转载荷下,加劲肋间距从1.6m-6m这一段,随着加劲肋间距的增大,主梁跨中下翼缘板节点应力反而减小；加劲肋间距与箱梁下翼缘板跨中任一节点对应的约束扭转应力为近似线性关系。本论文选题结合国家自然科学基金项目(51175442),研究结果为桥门式起重机箱梁结构加劲肋的设计提供了参考依据,尤其在考虑偏轨箱梁屈曲稳定性和约束扭转应力影响时参考意义更大。更多还原

【Abstract】 Bridge gantry crane are widely used to direct the movement of materials and equipment installation. It is widely used in ports, freight yard handling, structure installation, etc, plays a vital role in the national economy, have made outstanding contributions to promote the development of the whole society. The Continental Crane off-track box girder partition layout spacing ratio of large, simple structure, lightweight, long life, high reliability.Therefore, the research of crane girder structure and stiffeners has very important practical significance.The object of this paper is a partial rail box type double girder overhead crane main beam, research tool is ANSYS finite element analysis software. The research ideas:to write a single main beam APDL parametric procedures, procedures include:modeling, loads, constraints, stiffness calculation, strength calculation, buckling stability and restrained torsion; analysis using ANSYS software loads in the main beam cross, box coupling mechanism between the beam transverse stiffeners and box girder size parameters with off-track box girder stiffness, strength, buckling stability and restrained torsion. The course of the study:write APDL parameterized calculation program-according to the research needs to establish the corresponding finite element model-finite element method-summary of the calculation results.The main beam of a partial rail box type double girder overhead crane, the results show that:the stiffener spacing has little effect on the main beam bending stiffness, and no obvious rule; Stiffener spacing of a certain value (4.8m), the main beam under the flange plate of each node stress curves intersect a certain point, midspan stress of the bottom flange plate in the most uniform stress distribution, average70.0875MPa; the functional relationship between the box girder web thickness and its stability with power function, expression is y=288.69x2.7922,the correlation coefficient is0.9988; if the box girder web height increases, the buckling characteristics value will decreases;if the box girder stiffener spacing increases, its buckling value will decrease, and with the stiffener spacing increases the process gradually slowing down. The box girder stiffener spacing of2.0m to6.0m range, the box girder feature buckling value decreased more gentle, and the downward trend approximately linear;stiffener spacing increases will result in the box girder torsional rigidity decreases, but little impact; unconstrained torsion load, stiffener spacing from1.6m to6m this period, with the increase of stiffener spacing, the main beam midspan flange plate node hand, reduce stress; the stiffener spacing box girder bottom flange plate inter-node corresponding constrained torsion stress is approximately linear relationship. The thesis topics combines National Natural Science Foundation project of China (51175442), the results of the study, especially considering partial rail box girder buckling stability and restraint torsional stress influence, the reference value is greater.更多还原