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在分析普通螺栓群常规计算方法的基础上,指出目前计算方法中所确定的螺栓群中和轴位置存在的问题,提出了端板的挤压作用会影响到螺栓群中和轴的位置。通过对受端板挤压作用影响的螺栓群建立数学模型,推导出了考虑端板挤压作用影响的螺栓群在纯弯(拉弯)作用下中和轴位置的数学解式,并针对实际中存在的影响因素对所得到的数学解式进行了讨论,为实际工程设计提供了更为精确的计算模式。通过实例验证,最终得出,螺栓的数量偏离界限螺栓数越多,中和轴偏离边排螺栓截面中心越远;但螺栓数越多,常规计算方法所得到的螺栓拉力相对误差越小。提出了半离散-半连续截面的概念,分析了半离散-半连续截面的受力特点,并结合端板挤压作用影响下的普通螺栓群中和轴位置的受力分析,阐述了此类截面的分析方法。
Based on the analysis of the conventional calculation method of normal bolting group, the problems existing in the neutral axis position of the bolt group determined by the current calculation method are pointed out. It is proposed that the squeezing action of the end plate will affect the position of the neutral axis of the bolting group. The mathematic model of the bolt group affected by the extrusion of the end plate was established, and the mathematical solution of the neutral axis position of the bolt group under the influence of the end plate extrusion was deduced. Based on the actual The influencing factors existed in this paper discussed the mathematical solution, which provided a more accurate calculation mode for the actual engineering design. The results show that the more the bolts are deviated from the limit, the more the neutral axis deviates from the center of the cross-section row bolt. However, the larger the number of bolts, the smaller the relative error of the bolt pull force obtained by the conventional calculation method. The concept of semi-discrete-semicontinuous section is proposed and the mechanical characteristics of semi-discrete-semicontinuous section are analyzed. Combined with the stress analysis of the neutral axis position of normal bolt group under the influence of end-plate extrusion, this type of Sectional analysis method.