杠杆力作用下的螺栓联接刚度分析

发布时间：2018-06-15 23:29

本文选题：螺栓联接刚度 + 杠杆力　；参考：《机械强度》2017年05期

【摘要】：螺栓联接由于自身简单和实用性强的特点成为工程结构中应用最广泛的联接形式,但是由于几何结构突变造成整个结构刚度的变化,使得螺栓成为整个结构设计过程中涉及参数最多的影响因素,明确刚度特性的变化规律对于进行包含该结构动力学分析是至关重要的前提。针对螺栓联接的一种受力形式杠杆作用分别讨论了两个影响因素:预紧力大小;杠杆力与螺栓中心的距离对联接刚度变化规律的影响。计算结果表明,较大的预紧力可以保证结构的初始刚度,但是影响较为有限,预紧力增加100%的条件下,初始刚度增加13%;杠杆力与螺栓中心的距离越短,联接结构的初始刚度就越大,该距离增加30%,刚度降低60%。并基于分析结果提出了双指数形式的拟合公式,并与计算结果进行对比分析验证了拟合公式的合理性,该计算结果可以为采用螺栓联接的工程结构提供刚度计算分析方法,为此类结构进行动力学分析提供了基础刚度的研究依据。
[Abstract]:Bolt connection has become the most widely used connection form in engineering structure because of its simplicity and practicability. However, because of the sudden change of geometric structure, the stiffness of the whole structure is changed. The bolt is the most important factor in the whole structure design process. It is very important to determine the variation of stiffness characteristics for the dynamic analysis of the structure. In view of a kind of force form of bolt connection, the influence of two factors: the size of pretension force and the distance between lever force and bolt center on the stiffness of joint are discussed. The calculation results show that the initial stiffness of the structure can be guaranteed by a large pretension force, but the effect is limited. The initial stiffness increases by 13% when the pretension force increases by 100%, and the distance between the lever force and the bolt center is shorter. The greater the initial stiffness of the connection, the greater the distance increases by 30 and the stiffness is reduced by 60. Based on the analysis results, the fitting formula in double exponential form is put forward, and the rationality of the fitting formula is verified by comparing the results with the calculated results, which can provide the stiffness calculation and analysis method for the engineering structures with bolted connections. It provides the foundation stiffness research basis for the dynamic analysis of this kind of structure.
【作者单位】：大连理工大学工业装备结构分析国家重点实验室;大连交通大学交通运输工程学院;大连交通大学机械工程学院;
【基金】：国家自然科学基金(11402043)资助~~
【分类号】：TH131.3

【相似文献】